2014-12-09 22:57:48 +01:00
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# V8
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2017-01-22 19:16:21 -08:00
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<!--introduced_in=v4.0.0-->
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2020-06-22 13:56:08 -04:00
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<!-- source_link=lib/v8.js -->
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2022-04-20 10:23:41 +02:00
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The `node:v8` module exposes APIs that are specific to the version of [V8][]
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2016-05-17 22:11:57 -07:00
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built into the Node.js binary. It can be accessed using:
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2014-12-09 22:57:48 +01:00
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2016-05-17 22:11:57 -07:00
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```js
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2022-04-20 10:23:41 +02:00
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const v8 = require('node:v8');
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2016-05-17 22:11:57 -07:00
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```
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2019-12-24 15:56:57 -08:00
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## `v8.cachedDataVersionTag()`
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2021-10-10 21:55:04 -07:00
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2017-02-23 02:04:48 -05:00
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<!-- YAML
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2017-03-15 20:26:14 -07:00
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added: v8.0.0
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2017-02-23 02:04:48 -05:00
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-->
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2018-04-11 21:07:14 +03:00
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* Returns: {integer}
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2020-10-25 05:55:34 -07:00
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Returns an integer representing a version tag derived from the V8 version,
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command-line flags, and detected CPU features. This is useful for determining
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2017-02-23 02:04:48 -05:00
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whether a [`vm.Script`][] `cachedData` buffer is compatible with this instance
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of V8.
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2020-10-25 05:55:34 -07:00
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```js
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console.log(v8.cachedDataVersionTag()); // 3947234607
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// The value returned by v8.cachedDataVersionTag() is derived from the V8
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// version, command-line flags, and detected CPU features. Test that the value
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// does indeed update when flags are toggled.
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v8.setFlagsFromString('--allow_natives_syntax');
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console.log(v8.cachedDataVersionTag()); // 183726201
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```
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2020-11-07 09:33:37 -08:00
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## `v8.getHeapCodeStatistics()`
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2021-10-10 21:55:04 -07:00
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2020-11-07 09:33:37 -08:00
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<!-- YAML
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added: v12.8.0
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-->
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* Returns: {Object}
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2022-04-29 23:21:41 +08:00
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Get statistics about code and its metadata in the heap, see V8
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[`GetHeapCodeAndMetadataStatistics`][] API. Returns an object with the
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following properties:
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2020-11-07 09:33:37 -08:00
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* `code_and_metadata_size` {number}
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* `bytecode_and_metadata_size` {number}
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* `external_script_source_size` {number}
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2022-04-29 23:21:41 +08:00
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* `cpu_profiler_metadata_size` {number}
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2020-11-07 09:33:37 -08:00
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<!-- eslint-skip -->
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2021-10-10 21:55:04 -07:00
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2020-11-07 09:33:37 -08:00
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```js
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{
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code_and_metadata_size: 212208,
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bytecode_and_metadata_size: 161368,
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2022-04-29 23:21:41 +08:00
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external_script_source_size: 1410794,
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cpu_profiler_metadata_size: 0,
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2020-11-07 09:33:37 -08:00
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}
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```
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2022-10-13 14:37:22 +02:00
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## `v8.getHeapSnapshot([options])`
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2021-10-10 21:55:04 -07:00
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2020-10-28 06:58:45 -07:00
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<!-- YAML
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added: v11.13.0
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2022-10-13 14:37:22 +02:00
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changes:
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2022-11-01 14:01:40 -03:00
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- version: v19.1.0
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2022-10-13 14:37:22 +02:00
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pr-url: https://github.com/nodejs/node/pull/44989
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description: Support options to configure the heap snapshot.
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2020-10-28 06:58:45 -07:00
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-->
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2022-10-13 14:37:22 +02:00
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* `options` {Object}
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* `exposeInternals` {boolean} If true, expose internals in the heap snapshot.
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**Default:** `false`.
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* `exposeNumericValues` {boolean} If true, expose numeric values in
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artificial fields. **Default:** `false`.
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* Returns: {stream.Readable} A Readable containing the V8 heap snapshot.
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Generates a snapshot of the current V8 heap and returns a Readable
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Stream that may be used to read the JSON serialized representation.
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This JSON stream format is intended to be used with tools such as
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Chrome DevTools. The JSON schema is undocumented and specific to the
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V8 engine. Therefore, the schema may change from one version of V8 to the next.
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2022-02-04 20:16:41 +01:00
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Creating a heap snapshot requires memory about twice the size of the heap at
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the time the snapshot is created. This results in the risk of OOM killers
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terminating the process.
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Generating a snapshot is a synchronous operation which blocks the event loop
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for a duration depending on the heap size.
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2020-10-28 06:58:45 -07:00
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```js
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// Print heap snapshot to the console
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2022-04-20 10:23:41 +02:00
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const v8 = require('node:v8');
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2020-10-28 06:58:45 -07:00
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const stream = v8.getHeapSnapshot();
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stream.pipe(process.stdout);
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```
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2019-12-24 15:56:57 -08:00
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## `v8.getHeapSpaceStatistics()`
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2021-10-10 21:55:04 -07:00
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2016-05-10 20:21:30 -07:00
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<!-- YAML
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added: v6.0.0
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2017-02-21 23:38:50 +01:00
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changes:
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- version: v7.5.0
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pr-url: https://github.com/nodejs/node/pull/10186
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description: Support values exceeding the 32-bit unsigned integer range.
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2016-05-10 20:21:30 -07:00
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-->
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2015-12-29 11:54:35 +01:00
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2021-10-10 21:55:04 -07:00
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* Returns: {Object\[]}
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2018-04-11 21:07:14 +03:00
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2015-12-29 11:54:35 +01:00
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Returns statistics about the V8 heap spaces, i.e. the segments which make up
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2016-05-17 22:11:57 -07:00
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the V8 heap. Neither the ordering of heap spaces, nor the availability of a
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heap space can be guaranteed as the statistics are provided via the V8
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[`GetHeapSpaceStatistics`][] function and may change from one V8 version to the
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next.
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The value returned is an array of objects containing the following properties:
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2016-05-17 22:11:57 -07:00
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* `space_name` {string}
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* `space_size` {number}
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* `space_used_size` {number}
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* `space_available_size` {number}
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* `physical_space_size` {number}
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2015-12-29 11:54:35 +01:00
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2016-07-09 08:13:09 +03:00
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```json
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2015-12-29 11:54:35 +01:00
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[
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{
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"space_name": "new_space",
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"space_size": 2063872,
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"space_used_size": 951112,
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"space_available_size": 80824,
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"physical_space_size": 2063872
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},
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{
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"space_name": "old_space",
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"space_size": 3090560,
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"space_used_size": 2493792,
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"space_available_size": 0,
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"physical_space_size": 3090560
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},
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{
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"space_name": "code_space",
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"space_size": 1260160,
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"space_used_size": 644256,
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"space_available_size": 960,
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"physical_space_size": 1260160
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},
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{
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"space_name": "map_space",
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"space_size": 1094160,
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"space_used_size": 201608,
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"space_available_size": 0,
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"physical_space_size": 1094160
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},
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{
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"space_name": "large_object_space",
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"space_size": 0,
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"space_used_size": 0,
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"space_available_size": 1490980608,
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"physical_space_size": 0
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}
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]
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```
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2019-12-24 15:56:57 -08:00
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## `v8.getHeapStatistics()`
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2021-10-10 21:55:04 -07:00
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2017-02-13 04:49:35 +02:00
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<!-- YAML
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added: v1.0.0
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2017-02-21 23:38:50 +01:00
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changes:
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2020-10-01 20:49:03 +02:00
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- version: v7.5.0
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pr-url: https://github.com/nodejs/node/pull/10186
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description: Support values exceeding the 32-bit unsigned integer range.
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2017-02-21 23:38:50 +01:00
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- version: v7.2.0
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pr-url: https://github.com/nodejs/node/pull/8610
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description: Added `malloced_memory`, `peak_malloced_memory`,
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and `does_zap_garbage`.
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2017-02-13 04:49:35 +02:00
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-->
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2018-04-11 21:07:14 +03:00
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* Returns: {Object}
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2017-02-13 04:49:35 +02:00
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Returns an object with the following properties:
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* `total_heap_size` {number}
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* `total_heap_size_executable` {number}
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* `total_physical_size` {number}
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* `total_available_size` {number}
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* `used_heap_size` {number}
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* `heap_size_limit` {number}
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* `malloced_memory` {number}
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* `peak_malloced_memory` {number}
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* `does_zap_garbage` {number}
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2019-05-28 13:41:12 +03:00
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* `number_of_native_contexts` {number}
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* `number_of_detached_contexts` {number}
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2022-04-23 23:35:36 +08:00
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* `total_global_handles_size` {number}
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* `used_global_handles_size` {number}
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* `external_memory` {number}
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2019-05-28 13:41:12 +03:00
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2018-02-12 02:31:55 -05:00
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`does_zap_garbage` is a 0/1 boolean, which signifies whether the
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`--zap_code_space` option is enabled or not. This makes V8 overwrite heap
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2020-10-06 18:49:33 +04:00
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garbage with a bit pattern. The RSS footprint (resident set size) gets bigger
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2018-02-12 02:31:55 -05:00
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because it continuously touches all heap pages and that makes them less likely
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to get swapped out by the operating system.
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2017-02-13 04:49:35 +02:00
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2021-10-10 21:55:04 -07:00
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`number_of_native_contexts` The value of native\_context is the number of the
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2019-05-28 13:41:12 +03:00
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top-level contexts currently active. Increase of this number over time indicates
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a memory leak.
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2021-10-10 21:55:04 -07:00
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`number_of_detached_contexts` The value of detached\_context is the number
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2019-05-28 13:41:12 +03:00
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of contexts that were detached and not yet garbage collected. This number
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being non-zero indicates a potential memory leak.
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2022-04-23 23:35:36 +08:00
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`total_global_handles_size` The value of total\_global\_handles\_size is the
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total memory size of V8 global handles.
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`used_global_handles_size` The value of used\_global\_handles\_size is the
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used memory size of V8 global handles.
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`external_memory` The value of external\_memory is the memory size of array
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buffers and external strings.
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2017-07-03 03:05:59 +03:00
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<!-- eslint-skip -->
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2021-10-10 21:55:04 -07:00
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2017-02-13 04:49:35 +02:00
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```js
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{
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total_heap_size: 7326976,
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total_heap_size_executable: 4194304,
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total_physical_size: 7326976,
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total_available_size: 1152656,
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used_heap_size: 3476208,
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heap_size_limit: 1535115264,
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malloced_memory: 16384,
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peak_malloced_memory: 1127496,
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2019-05-28 13:41:12 +03:00
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does_zap_garbage: 0,
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number_of_native_contexts: 1,
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2022-04-23 23:35:36 +08:00
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number_of_detached_contexts: 0,
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total_global_handles_size: 8192,
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used_global_handles_size: 3296,
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external_memory: 318824
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2017-02-13 04:49:35 +02:00
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}
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```
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2024-03-02 23:11:30 +01:00
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## `v8.queryObjects(ctor[, options])`
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<!-- YAML
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2024-05-02 11:31:36 +02:00
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added:
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- v22.0.0
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- v20.13.0
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2024-03-02 23:11:30 +01:00
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-->
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> Stability: 1.1 - Active development
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* `ctor` {Function} The constructor that can be used to search on the
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prototype chain in order to filter target objects in the heap.
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* `options` {undefined|Object}
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* `format` {string} If it's `'count'`, the count of matched objects
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is returned. If it's `'summary'`, an array with summary strings
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of the matched objects is returned.
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* Returns: {number|Array<string>}
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This is similar to the [`queryObjects()` console API][] provided by the
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Chromium DevTools console. It can be used to search for objects that
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have the matching constructor on its prototype chain in the heap after
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a full garbage collection, which can be useful for memory leak
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regression tests. To avoid surprising results, users should avoid using
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this API on constructors whose implementation they don't control, or on
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constructors that can be invoked by other parties in the application.
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To avoid accidental leaks, this API does not return raw references to
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the objects found. By default, it returns the count of the objects
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found. If `options.format` is `'summary'`, it returns an array
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containing brief string representations for each object. The visibility
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provided in this API is similar to what the heap snapshot provides,
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while users can save the cost of serialization and parsing and directly
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filter the target objects during the search.
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Only objects created in the current execution context are included in the
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results.
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```cjs
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const { queryObjects } = require('node:v8');
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class A { foo = 'bar'; }
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console.log(queryObjects(A)); // 0
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const a = new A();
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console.log(queryObjects(A)); // 1
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// [ "A { foo: 'bar' }" ]
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console.log(queryObjects(A, { format: 'summary' }));
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class B extends A { bar = 'qux'; }
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const b = new B();
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console.log(queryObjects(B)); // 1
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// [ "B { foo: 'bar', bar: 'qux' }" ]
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console.log(queryObjects(B, { format: 'summary' }));
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// Note that, when there are child classes inheriting from a constructor,
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// the constructor also shows up in the prototype chain of the child
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// classes's prototoype, so the child classes's prototoype would also be
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// included in the result.
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console.log(queryObjects(A)); // 3
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// [ "B { foo: 'bar', bar: 'qux' }", 'A {}', "A { foo: 'bar' }" ]
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console.log(queryObjects(A, { format: 'summary' }));
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```
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```mjs
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import { queryObjects } from 'node:v8';
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class A { foo = 'bar'; }
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|
|
|
console.log(queryObjects(A)); // 0
|
|
|
|
const a = new A();
|
|
|
|
console.log(queryObjects(A)); // 1
|
|
|
|
// [ "A { foo: 'bar' }" ]
|
|
|
|
console.log(queryObjects(A, { format: 'summary' }));
|
|
|
|
|
|
|
|
class B extends A { bar = 'qux'; }
|
|
|
|
const b = new B();
|
|
|
|
console.log(queryObjects(B)); // 1
|
|
|
|
// [ "B { foo: 'bar', bar: 'qux' }" ]
|
|
|
|
console.log(queryObjects(B, { format: 'summary' }));
|
|
|
|
|
|
|
|
// Note that, when there are child classes inheriting from a constructor,
|
|
|
|
// the constructor also shows up in the prototype chain of the child
|
|
|
|
// classes's prototoype, so the child classes's prototoype would also be
|
|
|
|
// included in the result.
|
|
|
|
console.log(queryObjects(A)); // 3
|
|
|
|
// [ "B { foo: 'bar', bar: 'qux' }", 'A {}', "A { foo: 'bar' }" ]
|
|
|
|
console.log(queryObjects(A, { format: 'summary' }));
|
|
|
|
```
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
## `v8.setFlagsFromString(flags)`
|
2021-10-10 21:55:04 -07:00
|
|
|
|
2016-05-10 20:21:30 -07:00
|
|
|
<!-- YAML
|
|
|
|
added: v1.0.0
|
|
|
|
-->
|
2019-09-06 01:42:22 -04:00
|
|
|
|
2017-10-26 16:31:23 -07:00
|
|
|
* `flags` {string}
|
2014-12-09 22:57:48 +01:00
|
|
|
|
2016-11-15 09:56:15 -08:00
|
|
|
The `v8.setFlagsFromString()` method can be used to programmatically set
|
2020-09-14 17:28:27 -07:00
|
|
|
V8 command-line flags. This method should be used with care. Changing settings
|
2014-12-09 22:57:48 +01:00
|
|
|
after the VM has started may result in unpredictable behavior, including
|
2016-05-17 22:11:57 -07:00
|
|
|
crashes and data loss; or it may simply do nothing.
|
2014-12-09 22:57:48 +01:00
|
|
|
|
2015-12-07 20:20:50 +01:00
|
|
|
The V8 options available for a version of Node.js may be determined by running
|
2019-04-07 21:18:27 -04:00
|
|
|
`node --v8-options`.
|
2014-12-09 22:57:48 +01:00
|
|
|
|
|
|
|
Usage:
|
|
|
|
|
2016-01-17 18:39:07 +01:00
|
|
|
```js
|
2014-12-09 22:57:48 +01:00
|
|
|
// Print GC events to stdout for one minute.
|
2022-04-20 10:23:41 +02:00
|
|
|
const v8 = require('node:v8');
|
2014-12-09 22:57:48 +01:00
|
|
|
v8.setFlagsFromString('--trace_gc');
|
2018-11-24 16:00:12 +09:00
|
|
|
setTimeout(() => { v8.setFlagsFromString('--notrace_gc'); }, 60e3);
|
2014-12-09 22:57:48 +01:00
|
|
|
```
|
|
|
|
|
2021-06-30 21:22:38 -07:00
|
|
|
## `v8.stopCoverage()`
|
|
|
|
|
|
|
|
<!-- YAML
|
|
|
|
added:
|
|
|
|
- v15.1.0
|
2021-09-04 15:29:35 +02:00
|
|
|
- v14.18.0
|
2021-06-30 21:22:38 -07:00
|
|
|
- v12.22.0
|
|
|
|
-->
|
|
|
|
|
|
|
|
The `v8.stopCoverage()` method allows the user to stop the coverage collection
|
|
|
|
started by [`NODE_V8_COVERAGE`][], so that V8 can release the execution count
|
|
|
|
records and optimize code. This can be used in conjunction with
|
|
|
|
[`v8.takeCoverage()`][] if the user wants to collect the coverage on demand.
|
|
|
|
|
2020-06-09 20:46:52 +08:00
|
|
|
## `v8.takeCoverage()`
|
|
|
|
|
|
|
|
<!-- YAML
|
2021-03-18 16:52:00 +00:00
|
|
|
added:
|
|
|
|
- v15.1.0
|
2021-09-04 15:29:35 +02:00
|
|
|
- v14.18.0
|
2021-03-18 16:52:00 +00:00
|
|
|
- v12.22.0
|
2020-06-09 20:46:52 +08:00
|
|
|
-->
|
|
|
|
|
|
|
|
The `v8.takeCoverage()` method allows the user to write the coverage started by
|
|
|
|
[`NODE_V8_COVERAGE`][] to disk on demand. This method can be invoked multiple
|
2020-11-20 06:16:50 -08:00
|
|
|
times during the lifetime of the process. Each time the execution counter will
|
2020-06-09 20:46:52 +08:00
|
|
|
be reset and a new coverage report will be written to the directory specified
|
|
|
|
by [`NODE_V8_COVERAGE`][].
|
|
|
|
|
|
|
|
When the process is about to exit, one last coverage will still be written to
|
2020-11-20 06:16:50 -08:00
|
|
|
disk unless [`v8.stopCoverage()`][] is invoked before the process exits.
|
2020-06-09 21:18:25 +08:00
|
|
|
|
2022-10-13 14:37:22 +02:00
|
|
|
## `v8.writeHeapSnapshot([filename[,options]])`
|
2021-10-10 21:55:04 -07:00
|
|
|
|
2019-03-07 16:51:36 +00:00
|
|
|
<!-- YAML
|
2019-03-27 22:43:03 +01:00
|
|
|
added: v11.13.0
|
2022-01-12 09:39:49 +01:00
|
|
|
changes:
|
2022-11-01 14:01:40 -03:00
|
|
|
- version: v19.1.0
|
2022-10-13 14:37:22 +02:00
|
|
|
pr-url: https://github.com/nodejs/node/pull/44989
|
|
|
|
description: Support options to configure the heap snapshot.
|
2022-04-19, Version 18.0.0 (Current)
Notable Changes:
Deprecations and Removals:
- (SEMVER-MAJOR) fs: runtime deprecate string coercion in `fs.write`,
`fs.writeFileSync`
(Livia Medeiros) (https://github.com/nodejs/node/pull/42607)
- (SEMVER-MAJOR) dns: remove `dns.lookup` and `dnsPromises.lookup`
options type coercion
(Antoine du Hamel) (https://github.com/nodejs/node/pull/41431)
- (SEMVER-MAJOR) process: runtime deprecate multipleResolves
(Benjamin Gruenbaum) (https://github.com/nodejs/node/pull/41896)
- (SEMVER-MAJOR) stream: remove thenable support (Robert Nagy)
(https://github.com/nodejs/node/pull/40773)
- (SEMVER-MAJOR) tls: move tls.parseCertString to end-of-life
(Tobias Nießen) (https://github.com/nodejs/node/pull/41479)
fetch (experimental):
An experimental fetch API is available on the global scope by default.
The implementation is based upon https://undici.nodejs.org/#/,
an HTTP/1.1 client written for Node.js by contributors to the project.
Through this addition, the following globals are made available: `fetch`
, `FormData`, `Headers`, `Request`, `Response`.
Disable this API with the `--no-experimental-fetch` command-line flag.
Contributed by Michaël Zasso in https://github.com/nodejs/node/pull/41811.
HTTP Timeouts:
`server.headersTimeout`, which limits the amount of time the parser will
wait to receive the complete HTTP headers, is now set to `60000` (60
seconds) by default.
`server.requestTimeout`, which sets the timeout value in milliseconds
for receiving the entire request from the client, is now set to `300000`
(5 minutes) by default.
If these timeouts expire, the server responds with status 408 without
forwarding the request to the request listener and then closes the
connection.
Both timeouts must be set to a non-zero value to protect against
potential Denial-of-Service attacks in case the server is deployed
without a reverse proxy in front.
Contributed by Paolo Insogna in https://github.com/nodejs/node/pull/41263.
Test Runner module (experimental):
The `node:test` module facilitates the creation of JavaScript tests that
report results in TAP format. This module is only available under the
`node:` scheme.
Contributed by Colin Ihrig in https://github.com/nodejs/node/pull/42325.
Toolchain and Compiler Upgrades:
- Prebuilt binaries for Linux are now built on Red Hat Enterprise Linux
(RHEL) 8 and are compatible with Linux distributions based on glibc
2.28 or later, for example, Debian 10, RHEL 8, Ubuntu 20.04.
- Prebuilt binaries for macOS now require macOS 10.15 or later.
- For AIX the minimum supported architecture has been raised from Power
7 to Power 8.
Prebuilt binaries for 32-bit Windows will initially not be available due
to issues building the V8 dependency in Node.js. We hope to restore
32-bit Windows binaries for Node.js 18 with a future V8 update.
Node.js does not support running on operating systems that are no longer
supported by their vendor. For operating systems where their vendor has
planned to end support earlier than April 2025, such as Windows 8.1
(January 2023) and Windows Server 2012 R2 (October 2023), support for
Node.js 18 will end at the earlier date.
Full details about the supported toolchains and compilers are documented
in the Node.js `BUILDING.md` file.
Contributed by Richard Lau in https://github.com/nodejs/node/pull/42292,
https://github.com/nodejs/node/pull/42604 and https://github.com/nodejs/node/pull/42659
, and Michaël Zasso in https://github.com/nodejs/node/pull/42105 and
https://github.com/nodejs/node/pull/42666.
V8 10.1:
The V8 engine is updated to version 10.1, which is part of Chromium 101.
Compared to the version included in Node.js 17.9.0, the following new
features are included:
- The `findLast` and `findLastIndex` array methods.
- Improvements to the `Intl.Locale` API.
- The `Intl.supportedValuesOf` function.
- Improved performance of class fields and private class methods (the
initialization of them is now as fast as ordinary property stores).
The data format returned by the serialization API (`v8.serialize(value)`)
has changed, and cannot be deserialized by earlier versions of Node.js.
On the other hand, it is still possible to deserialize the previous
format, as the API is backwards-compatible.
Contributed by Michaël Zasso in https://github.com/nodejs/node/pull/42657.
Web Streams API (experimental):
Node.js now exposes the experimental implementation of the Web Streams
API on the global scope. This means the following APIs are now globally
available:
- `ReadableStream`, `ReadableStreamDefaultReader`,
`ReadableStreamBYOBReader`, `ReadableStreamBYOBRequest`,
`ReadableByteStreamController`, `ReadableStreamDefaultController`,
`TransformStream`, `TransformStreamDefaultController`, `WritableStream`,
`WritableStreamDefaultWriter`, `WritableStreamDefaultController`,
`ByteLengthQueuingStrategy`, `CountQueuingStrategy`, `TextEncoderStream`,
`TextDecoderStream`, `CompressionStream`, `DecompressionStream`.
Contributed James Snell in https://github.com/nodejs/node/pull/39062,
and Antoine du Hamel in https://github.com/nodejs/node/pull/42225.
Other Notable Changes:
- (SEMVER-MAJOR) buffer: expose Blob as a global
(James M Snell) (https://github.com/nodejs/node/pull/41270)
- (SEMVER-MAJOR) child\_process: improve argument validation
(Rich Trott) (https://github.com/nodejs/node/pull/41305)
- doc: add RafaelGSS to collaborators
(RafaelGSS) (https://github.com/nodejs/node/pull/42718)
- (SEMVER-MAJOR) http: make TCP noDelay enabled by default
(Paolo Insogna) (https://github.com/nodejs/node/pull/42163)
- (SEMVER-MAJOR) net: make `server.address()` return an integer for
`family`
(Antoine du Hamel) (https://github.com/nodejs/node/pull/41431)
- (SEMVER-MAJOR) worker: expose BroadcastChannel as a global
(James M Snell) (https://github.com/nodejs/node/pull/41271)
- (SEMVER-MAJOR) worker: graduate BroadcastChannel to supported
(James M Snell) (https://github.com/nodejs/node/pull/41271)
Semver-Major Commits:
- (SEMVER-MAJOR) assert,util: compare RegExp.lastIndex while using deep
equal checks
(Ruben Bridgewater) (https://github.com/nodejs/node/pull/41020)
- (SEMVER-MAJOR) buffer: refactor `byteLength` to remove outdated
optimizations
(Rongjian Zhang) (https://github.com/nodejs/node/pull/38545)
- (SEMVER-MAJOR) buffer: expose Blob as a global
(James M Snell) (https://github.com/nodejs/node/pull/41270)
- (SEMVER-MAJOR) buffer: graduate Blob from experimental
(James M Snell) (https://github.com/nodejs/node/pull/41270)
- (SEMVER-MAJOR) build: make x86 Windows support temporarily
experimental
(Michaël Zasso) (https://github.com/nodejs/node/pull/42666)
- (SEMVER-MAJOR) build: bump macOS deployment target to 10.15
(Richard Lau) (https://github.com/nodejs/node/pull/42292)
- (SEMVER-MAJOR) build: downgrade Windows 8.1 and server 2012 R2 to
experimental
(Michaël Zasso) (https://github.com/nodejs/node/pull/42105)
- (SEMVER-MAJOR) child\_process: improve argument validation
(Rich Trott) (https://github.com/nodejs/node/pull/41305)
- (SEMVER-MAJOR) cluster: make `kill` to be just `process.kill`
(Bar Admoni) (https://github.com/nodejs/node/pull/34312)
- (SEMVER-MAJOR) crypto: cleanup validation
(Mohammed Keyvanzadeh) (https://github.com/nodejs/node/pull/39841)
- (SEMVER-MAJOR) crypto: prettify othername in PrintGeneralName
(Tobias Nießen) (https://github.com/nodejs/node/pull/42123)
- (SEMVER-MAJOR) crypto: fix X509Certificate toLegacyObject
(Tobias Nießen) (https://github.com/nodejs/node/pull/42124)
- (SEMVER-MAJOR) crypto: use RFC2253 format in PrintGeneralName
(Tobias Nießen) (https://github.com/nodejs/node/pull/42002)
- (SEMVER-MAJOR) crypto: change default check(Host|Email) behavior
(Tobias Nießen) (https://github.com/nodejs/node/pull/41600)
- (SEMVER-MAJOR) deps: V8: cherry-pick semver-major commits from 10.2
(Michaël Zasso) (https://github.com/nodejs/node/pull/42657)
- (SEMVER-MAJOR) deps: update V8 to 10.1.124.6
(Michaël Zasso) (https://github.com/nodejs/node/pull/42657)
- (SEMVER-MAJOR) deps: update V8 to 9.8.177.9
(Michaël Zasso) (https://github.com/nodejs/node/pull/41610)
- (SEMVER-MAJOR) deps: update V8 to 9.7.106.18
(Michaël Zasso) (https://github.com/nodejs/node/pull/40907)
- (SEMVER-MAJOR) dns: remove `dns.lookup` and `dnsPromises.lookup`
options type coercion
(Antoine du Hamel) (https://github.com/nodejs/node/pull/41431)
- (SEMVER-MAJOR) doc: update minimum glibc requirements for Linux
(Richard Lau) (https://github.com/nodejs/node/pull/42659)
- (SEMVER-MAJOR) doc: update AIX minimum supported arch
(Richard Lau) (https://github.com/nodejs/node/pull/42604)
- (SEMVER-MAJOR) fs: runtime deprecate string coercion in `fs.write`,
`fs.writeFileSync`
(Livia Medeiros) (https://github.com/nodejs/node/pull/42607)
- (SEMVER-MAJOR) http: refactor headersTimeout and requestTimeout logic
(Paolo Insogna) (https://github.com/nodejs/node/pull/41263)
- (SEMVER-MAJOR) http: make TCP noDelay enabled by default
(Paolo Insogna) (https://github.com/nodejs/node/pull/42163)
- (SEMVER-MAJOR) lib: enable fetch by default
(Michaël Zasso) (https://github.com/nodejs/node/pull/41811)
- (SEMVER-MAJOR) lib: replace validator and error
(Mohammed Keyvanzadeh) (https://github.com/nodejs/node/pull/41678)
- (SEMVER-MAJOR) module,repl: support 'node:'-only core modules
(Colin Ihrig) (https://github.com/nodejs/node/pull/42325)
- (SEMVER-MAJOR) net: make `server.address()` return an integer for
`family`
(Antoine du Hamel) (https://github.com/nodejs/node/pull/41431)
- (SEMVER-MAJOR) process: disallow some uses of Object.defineProperty()
on process.env
(Himself65) (https://github.com/nodejs/node/pull/28006)
- (SEMVER-MAJOR) process: runtime deprecate multipleResolves
(Benjamin Gruenbaum) (https://github.com/nodejs/node/pull/41896)
- (SEMVER-MAJOR) readline: fix question still called after closed
(Xuguang Mei) (https://github.com/nodejs/node/pull/42464)
- (SEMVER-MAJOR) stream: remove thenable support
(Robert Nagy) (https://github.com/nodejs/node/pull/40773)
- (SEMVER-MAJOR) stream: expose web streams globals, remove runtime
experimental warning
(Antoine du Hamel) (https://github.com/nodejs/node/pull/42225)
- (SEMVER-MAJOR) stream: need to cleanup event listeners if last stream
is readable
(Xuguang Mei) (https://github.com/nodejs/node/pull/41954)
- (SEMVER-MAJOR) stream: revert revert `map` spec compliance
(Benjamin Gruenbaum) (https://github.com/nodejs/node/pull/41933)
- (SEMVER-MAJOR) stream: throw invalid arg type from End Of Stream
(Jithil P Ponnan) (https://github.com/nodejs/node/pull/41766)
- (SEMVER-MAJOR) stream: don't emit finish after destroy
(Robert Nagy) (https://github.com/nodejs/node/pull/40852)
- (SEMVER-MAJOR) stream: add errored and closed props
(Robert Nagy) (https://github.com/nodejs/node/pull/40696)
- (SEMVER-MAJOR) test: add initial test module
(Colin Ihrig) (https://github.com/nodejs/node/pull/42325)
- (SEMVER-MAJOR) timers: refactor internal classes to ES2015 syntax
(Rabbit) (https://github.com/nodejs/node/pull/37408)
- (SEMVER-MAJOR) tls: represent registeredID numerically always
(Tobias Nießen) (https://github.com/nodejs/node/pull/41561)
- (SEMVER-MAJOR) tls: move tls.parseCertString to end-of-life
(Tobias Nießen) (https://github.com/nodejs/node/pull/41479)
- (SEMVER-MAJOR) url: throw on NULL in IPv6 hostname
(Rich Trott) (https://github.com/nodejs/node/pull/42313)
- (SEMVER-MAJOR) v8: make v8.writeHeapSnapshot() error codes consistent
(Darshan Sen) (https://github.com/nodejs/node/pull/42577)
- (SEMVER-MAJOR) v8: make writeHeapSnapshot throw if fopen fails
(Antonio Román) (https://github.com/nodejs/node/pull/41373)
- (SEMVER-MAJOR) worker: expose BroadcastChannel as a global
(James M Snell) (https://github.com/nodejs/node/pull/41271)
- (SEMVER-MAJOR) worker: graduate BroadcastChannel to supported
(James M Snell) (https://github.com/nodejs/node/pull/41271)
PR-URL: https://github.com/nodejs/node/pull/42262
2022-03-08 01:39:47 +00:00
|
|
|
- version: v18.0.0
|
2022-01-12 09:39:49 +01:00
|
|
|
pr-url: https://github.com/nodejs/node/pull/41373
|
|
|
|
description: An exception will now be thrown if the file could not be written.
|
2022-04-19, Version 18.0.0 (Current)
Notable Changes:
Deprecations and Removals:
- (SEMVER-MAJOR) fs: runtime deprecate string coercion in `fs.write`,
`fs.writeFileSync`
(Livia Medeiros) (https://github.com/nodejs/node/pull/42607)
- (SEMVER-MAJOR) dns: remove `dns.lookup` and `dnsPromises.lookup`
options type coercion
(Antoine du Hamel) (https://github.com/nodejs/node/pull/41431)
- (SEMVER-MAJOR) process: runtime deprecate multipleResolves
(Benjamin Gruenbaum) (https://github.com/nodejs/node/pull/41896)
- (SEMVER-MAJOR) stream: remove thenable support (Robert Nagy)
(https://github.com/nodejs/node/pull/40773)
- (SEMVER-MAJOR) tls: move tls.parseCertString to end-of-life
(Tobias Nießen) (https://github.com/nodejs/node/pull/41479)
fetch (experimental):
An experimental fetch API is available on the global scope by default.
The implementation is based upon https://undici.nodejs.org/#/,
an HTTP/1.1 client written for Node.js by contributors to the project.
Through this addition, the following globals are made available: `fetch`
, `FormData`, `Headers`, `Request`, `Response`.
Disable this API with the `--no-experimental-fetch` command-line flag.
Contributed by Michaël Zasso in https://github.com/nodejs/node/pull/41811.
HTTP Timeouts:
`server.headersTimeout`, which limits the amount of time the parser will
wait to receive the complete HTTP headers, is now set to `60000` (60
seconds) by default.
`server.requestTimeout`, which sets the timeout value in milliseconds
for receiving the entire request from the client, is now set to `300000`
(5 minutes) by default.
If these timeouts expire, the server responds with status 408 without
forwarding the request to the request listener and then closes the
connection.
Both timeouts must be set to a non-zero value to protect against
potential Denial-of-Service attacks in case the server is deployed
without a reverse proxy in front.
Contributed by Paolo Insogna in https://github.com/nodejs/node/pull/41263.
Test Runner module (experimental):
The `node:test` module facilitates the creation of JavaScript tests that
report results in TAP format. This module is only available under the
`node:` scheme.
Contributed by Colin Ihrig in https://github.com/nodejs/node/pull/42325.
Toolchain and Compiler Upgrades:
- Prebuilt binaries for Linux are now built on Red Hat Enterprise Linux
(RHEL) 8 and are compatible with Linux distributions based on glibc
2.28 or later, for example, Debian 10, RHEL 8, Ubuntu 20.04.
- Prebuilt binaries for macOS now require macOS 10.15 or later.
- For AIX the minimum supported architecture has been raised from Power
7 to Power 8.
Prebuilt binaries for 32-bit Windows will initially not be available due
to issues building the V8 dependency in Node.js. We hope to restore
32-bit Windows binaries for Node.js 18 with a future V8 update.
Node.js does not support running on operating systems that are no longer
supported by their vendor. For operating systems where their vendor has
planned to end support earlier than April 2025, such as Windows 8.1
(January 2023) and Windows Server 2012 R2 (October 2023), support for
Node.js 18 will end at the earlier date.
Full details about the supported toolchains and compilers are documented
in the Node.js `BUILDING.md` file.
Contributed by Richard Lau in https://github.com/nodejs/node/pull/42292,
https://github.com/nodejs/node/pull/42604 and https://github.com/nodejs/node/pull/42659
, and Michaël Zasso in https://github.com/nodejs/node/pull/42105 and
https://github.com/nodejs/node/pull/42666.
V8 10.1:
The V8 engine is updated to version 10.1, which is part of Chromium 101.
Compared to the version included in Node.js 17.9.0, the following new
features are included:
- The `findLast` and `findLastIndex` array methods.
- Improvements to the `Intl.Locale` API.
- The `Intl.supportedValuesOf` function.
- Improved performance of class fields and private class methods (the
initialization of them is now as fast as ordinary property stores).
The data format returned by the serialization API (`v8.serialize(value)`)
has changed, and cannot be deserialized by earlier versions of Node.js.
On the other hand, it is still possible to deserialize the previous
format, as the API is backwards-compatible.
Contributed by Michaël Zasso in https://github.com/nodejs/node/pull/42657.
Web Streams API (experimental):
Node.js now exposes the experimental implementation of the Web Streams
API on the global scope. This means the following APIs are now globally
available:
- `ReadableStream`, `ReadableStreamDefaultReader`,
`ReadableStreamBYOBReader`, `ReadableStreamBYOBRequest`,
`ReadableByteStreamController`, `ReadableStreamDefaultController`,
`TransformStream`, `TransformStreamDefaultController`, `WritableStream`,
`WritableStreamDefaultWriter`, `WritableStreamDefaultController`,
`ByteLengthQueuingStrategy`, `CountQueuingStrategy`, `TextEncoderStream`,
`TextDecoderStream`, `CompressionStream`, `DecompressionStream`.
Contributed James Snell in https://github.com/nodejs/node/pull/39062,
and Antoine du Hamel in https://github.com/nodejs/node/pull/42225.
Other Notable Changes:
- (SEMVER-MAJOR) buffer: expose Blob as a global
(James M Snell) (https://github.com/nodejs/node/pull/41270)
- (SEMVER-MAJOR) child\_process: improve argument validation
(Rich Trott) (https://github.com/nodejs/node/pull/41305)
- doc: add RafaelGSS to collaborators
(RafaelGSS) (https://github.com/nodejs/node/pull/42718)
- (SEMVER-MAJOR) http: make TCP noDelay enabled by default
(Paolo Insogna) (https://github.com/nodejs/node/pull/42163)
- (SEMVER-MAJOR) net: make `server.address()` return an integer for
`family`
(Antoine du Hamel) (https://github.com/nodejs/node/pull/41431)
- (SEMVER-MAJOR) worker: expose BroadcastChannel as a global
(James M Snell) (https://github.com/nodejs/node/pull/41271)
- (SEMVER-MAJOR) worker: graduate BroadcastChannel to supported
(James M Snell) (https://github.com/nodejs/node/pull/41271)
Semver-Major Commits:
- (SEMVER-MAJOR) assert,util: compare RegExp.lastIndex while using deep
equal checks
(Ruben Bridgewater) (https://github.com/nodejs/node/pull/41020)
- (SEMVER-MAJOR) buffer: refactor `byteLength` to remove outdated
optimizations
(Rongjian Zhang) (https://github.com/nodejs/node/pull/38545)
- (SEMVER-MAJOR) buffer: expose Blob as a global
(James M Snell) (https://github.com/nodejs/node/pull/41270)
- (SEMVER-MAJOR) buffer: graduate Blob from experimental
(James M Snell) (https://github.com/nodejs/node/pull/41270)
- (SEMVER-MAJOR) build: make x86 Windows support temporarily
experimental
(Michaël Zasso) (https://github.com/nodejs/node/pull/42666)
- (SEMVER-MAJOR) build: bump macOS deployment target to 10.15
(Richard Lau) (https://github.com/nodejs/node/pull/42292)
- (SEMVER-MAJOR) build: downgrade Windows 8.1 and server 2012 R2 to
experimental
(Michaël Zasso) (https://github.com/nodejs/node/pull/42105)
- (SEMVER-MAJOR) child\_process: improve argument validation
(Rich Trott) (https://github.com/nodejs/node/pull/41305)
- (SEMVER-MAJOR) cluster: make `kill` to be just `process.kill`
(Bar Admoni) (https://github.com/nodejs/node/pull/34312)
- (SEMVER-MAJOR) crypto: cleanup validation
(Mohammed Keyvanzadeh) (https://github.com/nodejs/node/pull/39841)
- (SEMVER-MAJOR) crypto: prettify othername in PrintGeneralName
(Tobias Nießen) (https://github.com/nodejs/node/pull/42123)
- (SEMVER-MAJOR) crypto: fix X509Certificate toLegacyObject
(Tobias Nießen) (https://github.com/nodejs/node/pull/42124)
- (SEMVER-MAJOR) crypto: use RFC2253 format in PrintGeneralName
(Tobias Nießen) (https://github.com/nodejs/node/pull/42002)
- (SEMVER-MAJOR) crypto: change default check(Host|Email) behavior
(Tobias Nießen) (https://github.com/nodejs/node/pull/41600)
- (SEMVER-MAJOR) deps: V8: cherry-pick semver-major commits from 10.2
(Michaël Zasso) (https://github.com/nodejs/node/pull/42657)
- (SEMVER-MAJOR) deps: update V8 to 10.1.124.6
(Michaël Zasso) (https://github.com/nodejs/node/pull/42657)
- (SEMVER-MAJOR) deps: update V8 to 9.8.177.9
(Michaël Zasso) (https://github.com/nodejs/node/pull/41610)
- (SEMVER-MAJOR) deps: update V8 to 9.7.106.18
(Michaël Zasso) (https://github.com/nodejs/node/pull/40907)
- (SEMVER-MAJOR) dns: remove `dns.lookup` and `dnsPromises.lookup`
options type coercion
(Antoine du Hamel) (https://github.com/nodejs/node/pull/41431)
- (SEMVER-MAJOR) doc: update minimum glibc requirements for Linux
(Richard Lau) (https://github.com/nodejs/node/pull/42659)
- (SEMVER-MAJOR) doc: update AIX minimum supported arch
(Richard Lau) (https://github.com/nodejs/node/pull/42604)
- (SEMVER-MAJOR) fs: runtime deprecate string coercion in `fs.write`,
`fs.writeFileSync`
(Livia Medeiros) (https://github.com/nodejs/node/pull/42607)
- (SEMVER-MAJOR) http: refactor headersTimeout and requestTimeout logic
(Paolo Insogna) (https://github.com/nodejs/node/pull/41263)
- (SEMVER-MAJOR) http: make TCP noDelay enabled by default
(Paolo Insogna) (https://github.com/nodejs/node/pull/42163)
- (SEMVER-MAJOR) lib: enable fetch by default
(Michaël Zasso) (https://github.com/nodejs/node/pull/41811)
- (SEMVER-MAJOR) lib: replace validator and error
(Mohammed Keyvanzadeh) (https://github.com/nodejs/node/pull/41678)
- (SEMVER-MAJOR) module,repl: support 'node:'-only core modules
(Colin Ihrig) (https://github.com/nodejs/node/pull/42325)
- (SEMVER-MAJOR) net: make `server.address()` return an integer for
`family`
(Antoine du Hamel) (https://github.com/nodejs/node/pull/41431)
- (SEMVER-MAJOR) process: disallow some uses of Object.defineProperty()
on process.env
(Himself65) (https://github.com/nodejs/node/pull/28006)
- (SEMVER-MAJOR) process: runtime deprecate multipleResolves
(Benjamin Gruenbaum) (https://github.com/nodejs/node/pull/41896)
- (SEMVER-MAJOR) readline: fix question still called after closed
(Xuguang Mei) (https://github.com/nodejs/node/pull/42464)
- (SEMVER-MAJOR) stream: remove thenable support
(Robert Nagy) (https://github.com/nodejs/node/pull/40773)
- (SEMVER-MAJOR) stream: expose web streams globals, remove runtime
experimental warning
(Antoine du Hamel) (https://github.com/nodejs/node/pull/42225)
- (SEMVER-MAJOR) stream: need to cleanup event listeners if last stream
is readable
(Xuguang Mei) (https://github.com/nodejs/node/pull/41954)
- (SEMVER-MAJOR) stream: revert revert `map` spec compliance
(Benjamin Gruenbaum) (https://github.com/nodejs/node/pull/41933)
- (SEMVER-MAJOR) stream: throw invalid arg type from End Of Stream
(Jithil P Ponnan) (https://github.com/nodejs/node/pull/41766)
- (SEMVER-MAJOR) stream: don't emit finish after destroy
(Robert Nagy) (https://github.com/nodejs/node/pull/40852)
- (SEMVER-MAJOR) stream: add errored and closed props
(Robert Nagy) (https://github.com/nodejs/node/pull/40696)
- (SEMVER-MAJOR) test: add initial test module
(Colin Ihrig) (https://github.com/nodejs/node/pull/42325)
- (SEMVER-MAJOR) timers: refactor internal classes to ES2015 syntax
(Rabbit) (https://github.com/nodejs/node/pull/37408)
- (SEMVER-MAJOR) tls: represent registeredID numerically always
(Tobias Nießen) (https://github.com/nodejs/node/pull/41561)
- (SEMVER-MAJOR) tls: move tls.parseCertString to end-of-life
(Tobias Nießen) (https://github.com/nodejs/node/pull/41479)
- (SEMVER-MAJOR) url: throw on NULL in IPv6 hostname
(Rich Trott) (https://github.com/nodejs/node/pull/42313)
- (SEMVER-MAJOR) v8: make v8.writeHeapSnapshot() error codes consistent
(Darshan Sen) (https://github.com/nodejs/node/pull/42577)
- (SEMVER-MAJOR) v8: make writeHeapSnapshot throw if fopen fails
(Antonio Román) (https://github.com/nodejs/node/pull/41373)
- (SEMVER-MAJOR) worker: expose BroadcastChannel as a global
(James M Snell) (https://github.com/nodejs/node/pull/41271)
- (SEMVER-MAJOR) worker: graduate BroadcastChannel to supported
(James M Snell) (https://github.com/nodejs/node/pull/41271)
PR-URL: https://github.com/nodejs/node/pull/42262
2022-03-08 01:39:47 +00:00
|
|
|
- version: v18.0.0
|
2022-04-05 19:25:51 +05:30
|
|
|
pr-url: https://github.com/nodejs/node/pull/42577
|
|
|
|
description: Make the returned error codes consistent across all platforms.
|
2019-03-07 16:51:36 +00:00
|
|
|
-->
|
|
|
|
|
|
|
|
* `filename` {string} The file path where the V8 heap snapshot is to be
|
|
|
|
saved. If not specified, a file name with the pattern
|
|
|
|
`'Heap-${yyyymmdd}-${hhmmss}-${pid}-${thread_id}.heapsnapshot'` will be
|
|
|
|
generated, where `{pid}` will be the PID of the Node.js process,
|
|
|
|
`{thread_id}` will be `0` when `writeHeapSnapshot()` is called from
|
|
|
|
the main Node.js thread or the id of a worker thread.
|
2022-10-13 14:37:22 +02:00
|
|
|
* `options` {Object}
|
|
|
|
* `exposeInternals` {boolean} If true, expose internals in the heap snapshot.
|
|
|
|
**Default:** `false`.
|
|
|
|
* `exposeNumericValues` {boolean} If true, expose numeric values in
|
|
|
|
artificial fields. **Default:** `false`.
|
2019-03-07 16:51:36 +00:00
|
|
|
* Returns: {string} The filename where the snapshot was saved.
|
|
|
|
|
|
|
|
Generates a snapshot of the current V8 heap and writes it to a JSON
|
|
|
|
file. This file is intended to be used with tools such as Chrome
|
|
|
|
DevTools. The JSON schema is undocumented and specific to the V8
|
|
|
|
engine, and may change from one version of V8 to the next.
|
|
|
|
|
|
|
|
A heap snapshot is specific to a single V8 isolate. When using
|
2020-06-14 14:49:34 -07:00
|
|
|
[worker threads][], a heap snapshot generated from the main thread will
|
2019-03-07 16:51:36 +00:00
|
|
|
not contain any information about the workers, and vice versa.
|
|
|
|
|
2022-02-04 20:16:41 +01:00
|
|
|
Creating a heap snapshot requires memory about twice the size of the heap at
|
|
|
|
the time the snapshot is created. This results in the risk of OOM killers
|
|
|
|
terminating the process.
|
|
|
|
|
|
|
|
Generating a snapshot is a synchronous operation which blocks the event loop
|
|
|
|
for a duration depending on the heap size.
|
|
|
|
|
2019-03-07 16:51:36 +00:00
|
|
|
```js
|
2022-04-20 10:23:41 +02:00
|
|
|
const { writeHeapSnapshot } = require('node:v8');
|
2019-03-07 16:51:36 +00:00
|
|
|
const {
|
|
|
|
Worker,
|
|
|
|
isMainThread,
|
2022-11-17 08:19:12 -05:00
|
|
|
parentPort,
|
2022-04-20 10:23:41 +02:00
|
|
|
} = require('node:worker_threads');
|
2019-03-07 16:51:36 +00:00
|
|
|
|
|
|
|
if (isMainThread) {
|
|
|
|
const worker = new Worker(__filename);
|
|
|
|
|
|
|
|
worker.once('message', (filename) => {
|
|
|
|
console.log(`worker heapdump: ${filename}`);
|
|
|
|
// Now get a heapdump for the main thread.
|
|
|
|
console.log(`main thread heapdump: ${writeHeapSnapshot()}`);
|
|
|
|
});
|
|
|
|
|
|
|
|
// Tell the worker to create a heapdump.
|
|
|
|
worker.postMessage('heapdump');
|
|
|
|
} else {
|
|
|
|
parentPort.once('message', (message) => {
|
|
|
|
if (message === 'heapdump') {
|
|
|
|
// Generate a heapdump for the worker
|
|
|
|
// and return the filename to the parent.
|
|
|
|
parentPort.postMessage(writeHeapSnapshot());
|
|
|
|
}
|
|
|
|
});
|
|
|
|
}
|
|
|
|
```
|
|
|
|
|
2022-09-08 17:33:20 +08:00
|
|
|
## `v8.setHeapSnapshotNearHeapLimit(limit)`
|
|
|
|
|
|
|
|
<!-- YAML
|
2022-10-11 14:54:19 -05:00
|
|
|
added:
|
|
|
|
- v18.10.0
|
|
|
|
- v16.18.0
|
2022-09-08 17:33:20 +08:00
|
|
|
-->
|
|
|
|
|
|
|
|
> Stability: 1 - Experimental
|
|
|
|
|
|
|
|
* `limit` {integer}
|
|
|
|
|
|
|
|
The API is a no-op if `--heapsnapshot-near-heap-limit` is already set from the
|
|
|
|
command line or the API is called more than once. `limit` must be a positive
|
|
|
|
integer. See [`--heapsnapshot-near-heap-limit`][] for more information.
|
|
|
|
|
2017-01-26 21:38:11 -08:00
|
|
|
## Serialization API
|
|
|
|
|
|
|
|
The serialization API provides means of serializing JavaScript values in a way
|
|
|
|
that is compatible with the [HTML structured clone algorithm][].
|
2020-01-28 12:59:25 +00:00
|
|
|
|
2017-01-26 21:38:11 -08:00
|
|
|
The format is backward-compatible (i.e. safe to store to disk).
|
2020-01-28 12:59:25 +00:00
|
|
|
Equal JavaScript values may result in different serialized output.
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
### `v8.serialize(value)`
|
2021-10-10 21:55:04 -07:00
|
|
|
|
2018-04-14 05:37:43 +03:00
|
|
|
<!-- YAML
|
2017-03-15 20:26:14 -07:00
|
|
|
added: v8.0.0
|
2017-01-26 21:38:11 -08:00
|
|
|
-->
|
|
|
|
|
2018-07-12 13:48:11 -04:00
|
|
|
* `value` {any}
|
2017-01-26 21:38:11 -08:00
|
|
|
* Returns: {Buffer}
|
|
|
|
|
|
|
|
Uses a [`DefaultSerializer`][] to serialize `value` into a buffer.
|
|
|
|
|
2021-10-05 08:50:50 +08:00
|
|
|
[`ERR_BUFFER_TOO_LARGE`][] will be thrown when trying to
|
|
|
|
serialize a huge object which requires buffer
|
|
|
|
larger than [`buffer.constants.MAX_LENGTH`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
### `v8.deserialize(buffer)`
|
2021-10-10 21:55:04 -07:00
|
|
|
|
2018-04-14 05:37:43 +03:00
|
|
|
<!-- YAML
|
2017-03-15 20:26:14 -07:00
|
|
|
added: v8.0.0
|
2017-01-26 21:38:11 -08:00
|
|
|
-->
|
|
|
|
|
2018-10-29 07:36:19 -04:00
|
|
|
* `buffer` {Buffer|TypedArray|DataView} A buffer returned by [`serialize()`][].
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
Uses a [`DefaultDeserializer`][] with default options to read a JS value
|
|
|
|
from a buffer.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
### Class: `v8.Serializer`
|
2021-10-10 21:55:04 -07:00
|
|
|
|
2018-04-14 05:37:43 +03:00
|
|
|
<!-- YAML
|
2017-03-15 20:26:14 -07:00
|
|
|
added: v8.0.0
|
2017-01-26 21:38:11 -08:00
|
|
|
-->
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `new Serializer()`
|
2021-10-10 21:55:04 -07:00
|
|
|
|
2017-01-26 21:38:11 -08:00
|
|
|
Creates a new `Serializer` object.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer.writeHeader()`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
Writes out a header, which includes the serialization format version.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer.writeValue(value)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2018-07-12 13:48:11 -04:00
|
|
|
* `value` {any}
|
|
|
|
|
2017-01-26 21:38:11 -08:00
|
|
|
Serializes a JavaScript value and adds the serialized representation to the
|
|
|
|
internal buffer.
|
|
|
|
|
|
|
|
This throws an error if `value` cannot be serialized.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer.releaseBuffer()`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2018-04-11 21:07:14 +03:00
|
|
|
* Returns: {Buffer}
|
|
|
|
|
2017-01-26 21:38:11 -08:00
|
|
|
Returns the stored internal buffer. This serializer should not be used once
|
|
|
|
the buffer is released. Calling this method results in undefined behavior
|
|
|
|
if a previous write has failed.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer.transferArrayBuffer(id, arrayBuffer)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* `id` {integer} A 32-bit unsigned integer.
|
|
|
|
* `arrayBuffer` {ArrayBuffer} An `ArrayBuffer` instance.
|
|
|
|
|
2019-02-26 01:30:23 -05:00
|
|
|
Marks an `ArrayBuffer` as having its contents transferred out of band.
|
2017-01-26 21:38:11 -08:00
|
|
|
Pass the corresponding `ArrayBuffer` in the deserializing context to
|
|
|
|
[`deserializer.transferArrayBuffer()`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer.writeUint32(value)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* `value` {integer}
|
|
|
|
|
|
|
|
Write a raw 32-bit unsigned integer.
|
|
|
|
For use inside of a custom [`serializer._writeHostObject()`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer.writeUint64(hi, lo)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* `hi` {integer}
|
|
|
|
* `lo` {integer}
|
|
|
|
|
|
|
|
Write a raw 64-bit unsigned integer, split into high and low 32-bit parts.
|
|
|
|
For use inside of a custom [`serializer._writeHostObject()`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer.writeDouble(value)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* `value` {number}
|
|
|
|
|
|
|
|
Write a JS `number` value.
|
|
|
|
For use inside of a custom [`serializer._writeHostObject()`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer.writeRawBytes(buffer)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2018-10-29 07:36:19 -04:00
|
|
|
* `buffer` {Buffer|TypedArray|DataView}
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2022-05-17 21:04:51 +02:00
|
|
|
Write raw bytes into the serializer's internal buffer. The deserializer
|
2017-01-26 21:38:11 -08:00
|
|
|
will require a way to compute the length of the buffer.
|
|
|
|
For use inside of a custom [`serializer._writeHostObject()`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer._writeHostObject(object)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* `object` {Object}
|
|
|
|
|
|
|
|
This method is called to write some kind of host object, i.e. an object created
|
|
|
|
by native C++ bindings. If it is not possible to serialize `object`, a suitable
|
|
|
|
exception should be thrown.
|
|
|
|
|
|
|
|
This method is not present on the `Serializer` class itself but can be provided
|
|
|
|
by subclasses.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer._getDataCloneError(message)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* `message` {string}
|
|
|
|
|
|
|
|
This method is called to generate error objects that will be thrown when an
|
|
|
|
object can not be cloned.
|
|
|
|
|
2017-12-31 15:15:43 +05:30
|
|
|
This method defaults to the [`Error`][] constructor and can be overridden on
|
2017-01-26 21:38:11 -08:00
|
|
|
subclasses.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer._getSharedArrayBufferId(sharedArrayBuffer)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* `sharedArrayBuffer` {SharedArrayBuffer}
|
|
|
|
|
|
|
|
This method is called when the serializer is going to serialize a
|
|
|
|
`SharedArrayBuffer` object. It must return an unsigned 32-bit integer ID for
|
|
|
|
the object, using the same ID if this `SharedArrayBuffer` has already been
|
|
|
|
serialized. When deserializing, this ID will be passed to
|
|
|
|
[`deserializer.transferArrayBuffer()`][].
|
|
|
|
|
|
|
|
If the object cannot be serialized, an exception should be thrown.
|
|
|
|
|
|
|
|
This method is not present on the `Serializer` class itself but can be provided
|
|
|
|
by subclasses.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `serializer._setTreatArrayBufferViewsAsHostObjects(flag)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2018-04-02 04:44:32 +03:00
|
|
|
* `flag` {boolean} **Default:** `false`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
Indicate whether to treat `TypedArray` and `DataView` objects as
|
2017-07-20 21:01:51 +03:00
|
|
|
host objects, i.e. pass them to [`serializer._writeHostObject()`][].
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
### Class: `v8.Deserializer`
|
2021-10-10 21:55:04 -07:00
|
|
|
|
2018-04-14 05:37:43 +03:00
|
|
|
<!-- YAML
|
2017-03-15 20:26:14 -07:00
|
|
|
added: v8.0.0
|
2017-01-26 21:38:11 -08:00
|
|
|
-->
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `new Deserializer(buffer)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2018-10-29 07:36:19 -04:00
|
|
|
* `buffer` {Buffer|TypedArray|DataView} A buffer returned by
|
2018-02-12 02:31:55 -05:00
|
|
|
[`serializer.releaseBuffer()`][].
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
Creates a new `Deserializer` object.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `deserializer.readHeader()`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
Reads and validates a header (including the format version).
|
|
|
|
May, for example, reject an invalid or unsupported wire format. In that case,
|
|
|
|
an `Error` is thrown.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `deserializer.readValue()`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
Deserializes a JavaScript value from the buffer and returns it.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `deserializer.transferArrayBuffer(id, arrayBuffer)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* `id` {integer} A 32-bit unsigned integer.
|
|
|
|
* `arrayBuffer` {ArrayBuffer|SharedArrayBuffer} An `ArrayBuffer` instance.
|
|
|
|
|
2019-02-26 01:30:23 -05:00
|
|
|
Marks an `ArrayBuffer` as having its contents transferred out of band.
|
2017-01-26 21:38:11 -08:00
|
|
|
Pass the corresponding `ArrayBuffer` in the serializing context to
|
|
|
|
[`serializer.transferArrayBuffer()`][] (or return the `id` from
|
|
|
|
[`serializer._getSharedArrayBufferId()`][] in the case of `SharedArrayBuffer`s).
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `deserializer.getWireFormatVersion()`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* Returns: {integer}
|
|
|
|
|
|
|
|
Reads the underlying wire format version. Likely mostly to be useful to
|
|
|
|
legacy code reading old wire format versions. May not be called before
|
|
|
|
`.readHeader()`.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `deserializer.readUint32()`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* Returns: {integer}
|
|
|
|
|
|
|
|
Read a raw 32-bit unsigned integer and return it.
|
|
|
|
For use inside of a custom [`deserializer._readHostObject()`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `deserializer.readUint64()`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2021-10-10 21:55:04 -07:00
|
|
|
* Returns: {integer\[]}
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
Read a raw 64-bit unsigned integer and return it as an array `[hi, lo]`
|
|
|
|
with two 32-bit unsigned integer entries.
|
|
|
|
For use inside of a custom [`deserializer._readHostObject()`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `deserializer.readDouble()`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
* Returns: {number}
|
|
|
|
|
|
|
|
Read a JS `number` value.
|
|
|
|
For use inside of a custom [`deserializer._readHostObject()`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `deserializer.readRawBytes(length)`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
2018-07-12 13:48:11 -04:00
|
|
|
* `length` {integer}
|
2017-01-26 21:38:11 -08:00
|
|
|
* Returns: {Buffer}
|
|
|
|
|
2022-05-17 21:04:51 +02:00
|
|
|
Read raw bytes from the deserializer's internal buffer. The `length` parameter
|
2017-01-26 21:38:11 -08:00
|
|
|
must correspond to the length of the buffer that was passed to
|
|
|
|
[`serializer.writeRawBytes()`][].
|
|
|
|
For use inside of a custom [`deserializer._readHostObject()`][].
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
#### `deserializer._readHostObject()`
|
2017-01-26 21:38:11 -08:00
|
|
|
|
|
|
|
This method is called to read some kind of host object, i.e. an object that is
|
|
|
|
created by native C++ bindings. If it is not possible to deserialize the data,
|
|
|
|
a suitable exception should be thrown.
|
|
|
|
|
|
|
|
This method is not present on the `Deserializer` class itself but can be
|
|
|
|
provided by subclasses.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
### Class: `v8.DefaultSerializer`
|
2021-10-10 21:55:04 -07:00
|
|
|
|
2018-04-14 05:37:43 +03:00
|
|
|
<!-- YAML
|
2017-03-15 20:26:14 -07:00
|
|
|
added: v8.0.0
|
2017-01-26 21:38:11 -08:00
|
|
|
-->
|
|
|
|
|
|
|
|
A subclass of [`Serializer`][] that serializes `TypedArray`
|
|
|
|
(in particular [`Buffer`][]) and `DataView` objects as host objects, and only
|
|
|
|
stores the part of their underlying `ArrayBuffer`s that they are referring to.
|
|
|
|
|
2019-12-24 15:56:57 -08:00
|
|
|
### Class: `v8.DefaultDeserializer`
|
2021-10-10 21:55:04 -07:00
|
|
|
|
2018-04-14 05:37:43 +03:00
|
|
|
<!-- YAML
|
2017-03-15 20:26:14 -07:00
|
|
|
added: v8.0.0
|
2017-01-26 21:38:11 -08:00
|
|
|
-->
|
|
|
|
|
|
|
|
A subclass of [`Deserializer`][] corresponding to the format written by
|
|
|
|
[`DefaultSerializer`][].
|
|
|
|
|
2021-07-04 17:43:26 -07:00
|
|
|
## Promise hooks
|
|
|
|
|
|
|
|
The `promiseHooks` interface can be used to track promise lifecycle events.
|
|
|
|
To track _all_ async activity, see [`async_hooks`][] which internally uses this
|
|
|
|
module to produce promise lifecycle events in addition to events for other
|
|
|
|
async resources. For request context management, see [`AsyncLocalStorage`][].
|
|
|
|
|
|
|
|
```mjs
|
2022-04-20 10:23:41 +02:00
|
|
|
import { promiseHooks } from 'node:v8';
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
// There are four lifecycle events produced by promises:
|
|
|
|
|
|
|
|
// The `init` event represents the creation of a promise. This could be a
|
|
|
|
// direct creation such as with `new Promise(...)` or a continuation such
|
|
|
|
// as `then()` or `catch()`. It also happens whenever an async function is
|
|
|
|
// called or does an `await`. If a continuation promise is created, the
|
|
|
|
// `parent` will be the promise it is a continuation from.
|
|
|
|
function init(promise, parent) {
|
|
|
|
console.log('a promise was created', { promise, parent });
|
|
|
|
}
|
|
|
|
|
|
|
|
// The `settled` event happens when a promise receives a resolution or
|
|
|
|
// rejection value. This may happen synchronously such as when using
|
|
|
|
// `Promise.resolve()` on non-promise input.
|
|
|
|
function settled(promise) {
|
|
|
|
console.log('a promise resolved or rejected', { promise });
|
|
|
|
}
|
|
|
|
|
|
|
|
// The `before` event runs immediately before a `then()` or `catch()` handler
|
|
|
|
// runs or an `await` resumes execution.
|
|
|
|
function before(promise) {
|
|
|
|
console.log('a promise is about to call a then handler', { promise });
|
|
|
|
}
|
|
|
|
|
|
|
|
// The `after` event runs immediately after a `then()` handler runs or when
|
|
|
|
// an `await` begins after resuming from another.
|
|
|
|
function after(promise) {
|
|
|
|
console.log('a promise is done calling a then handler', { promise });
|
|
|
|
}
|
|
|
|
|
|
|
|
// Lifecycle hooks may be started and stopped individually
|
|
|
|
const stopWatchingInits = promiseHooks.onInit(init);
|
|
|
|
const stopWatchingSettleds = promiseHooks.onSettled(settled);
|
|
|
|
const stopWatchingBefores = promiseHooks.onBefore(before);
|
|
|
|
const stopWatchingAfters = promiseHooks.onAfter(after);
|
|
|
|
|
|
|
|
// Or they may be started and stopped in groups
|
|
|
|
const stopHookSet = promiseHooks.createHook({
|
|
|
|
init,
|
|
|
|
settled,
|
|
|
|
before,
|
2022-11-17 08:19:12 -05:00
|
|
|
after,
|
2021-07-04 17:43:26 -07:00
|
|
|
});
|
|
|
|
|
|
|
|
// To stop a hook, call the function returned at its creation.
|
|
|
|
stopWatchingInits();
|
|
|
|
stopWatchingSettleds();
|
|
|
|
stopWatchingBefores();
|
|
|
|
stopWatchingAfters();
|
|
|
|
stopHookSet();
|
|
|
|
```
|
|
|
|
|
|
|
|
### `promiseHooks.onInit(init)`
|
2021-11-01 15:38:59 -07:00
|
|
|
|
2021-07-04 17:43:26 -07:00
|
|
|
<!-- YAML
|
2022-02-01 00:34:51 -05:00
|
|
|
added:
|
|
|
|
- v17.1.0
|
|
|
|
- v16.14.0
|
2021-07-04 17:43:26 -07:00
|
|
|
-->
|
|
|
|
|
|
|
|
* `init` {Function} The [`init` callback][] to call when a promise is created.
|
|
|
|
* Returns: {Function} Call to stop the hook.
|
|
|
|
|
|
|
|
**The `init` hook must be a plain function. Providing an async function will
|
|
|
|
throw as it would produce an infinite microtask loop.**
|
|
|
|
|
|
|
|
```mjs
|
2022-04-20 10:23:41 +02:00
|
|
|
import { promiseHooks } from 'node:v8';
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stop = promiseHooks.onInit((promise, parent) => {});
|
|
|
|
```
|
|
|
|
|
|
|
|
```cjs
|
2022-04-20 10:23:41 +02:00
|
|
|
const { promiseHooks } = require('node:v8');
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stop = promiseHooks.onInit((promise, parent) => {});
|
|
|
|
```
|
|
|
|
|
|
|
|
### `promiseHooks.onSettled(settled)`
|
2021-11-01 15:38:59 -07:00
|
|
|
|
2021-07-04 17:43:26 -07:00
|
|
|
<!-- YAML
|
2022-02-01 00:34:51 -05:00
|
|
|
added:
|
|
|
|
- v17.1.0
|
|
|
|
- v16.14.0
|
2021-07-04 17:43:26 -07:00
|
|
|
-->
|
|
|
|
|
|
|
|
* `settled` {Function} The [`settled` callback][] to call when a promise
|
|
|
|
is resolved or rejected.
|
|
|
|
* Returns: {Function} Call to stop the hook.
|
|
|
|
|
|
|
|
**The `settled` hook must be a plain function. Providing an async function will
|
|
|
|
throw as it would produce an infinite microtask loop.**
|
|
|
|
|
|
|
|
```mjs
|
2022-04-20 10:23:41 +02:00
|
|
|
import { promiseHooks } from 'node:v8';
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stop = promiseHooks.onSettled((promise) => {});
|
|
|
|
```
|
|
|
|
|
|
|
|
```cjs
|
2022-04-20 10:23:41 +02:00
|
|
|
const { promiseHooks } = require('node:v8');
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stop = promiseHooks.onSettled((promise) => {});
|
|
|
|
```
|
|
|
|
|
|
|
|
### `promiseHooks.onBefore(before)`
|
2021-11-01 15:38:59 -07:00
|
|
|
|
2021-07-04 17:43:26 -07:00
|
|
|
<!-- YAML
|
2022-02-01 00:34:51 -05:00
|
|
|
added:
|
|
|
|
- v17.1.0
|
|
|
|
- v16.14.0
|
2021-07-04 17:43:26 -07:00
|
|
|
-->
|
|
|
|
|
|
|
|
* `before` {Function} The [`before` callback][] to call before a promise
|
|
|
|
continuation executes.
|
|
|
|
* Returns: {Function} Call to stop the hook.
|
|
|
|
|
|
|
|
**The `before` hook must be a plain function. Providing an async function will
|
|
|
|
throw as it would produce an infinite microtask loop.**
|
|
|
|
|
|
|
|
```mjs
|
2022-04-20 10:23:41 +02:00
|
|
|
import { promiseHooks } from 'node:v8';
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stop = promiseHooks.onBefore((promise) => {});
|
|
|
|
```
|
|
|
|
|
|
|
|
```cjs
|
2022-04-20 10:23:41 +02:00
|
|
|
const { promiseHooks } = require('node:v8');
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stop = promiseHooks.onBefore((promise) => {});
|
|
|
|
```
|
|
|
|
|
|
|
|
### `promiseHooks.onAfter(after)`
|
2021-11-01 15:38:59 -07:00
|
|
|
|
2021-07-04 17:43:26 -07:00
|
|
|
<!-- YAML
|
2022-02-01 00:34:51 -05:00
|
|
|
added:
|
|
|
|
- v17.1.0
|
|
|
|
- v16.14.0
|
2021-07-04 17:43:26 -07:00
|
|
|
-->
|
|
|
|
|
|
|
|
* `after` {Function} The [`after` callback][] to call after a promise
|
|
|
|
continuation executes.
|
|
|
|
* Returns: {Function} Call to stop the hook.
|
|
|
|
|
|
|
|
**The `after` hook must be a plain function. Providing an async function will
|
|
|
|
throw as it would produce an infinite microtask loop.**
|
|
|
|
|
|
|
|
```mjs
|
2022-04-20 10:23:41 +02:00
|
|
|
import { promiseHooks } from 'node:v8';
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stop = promiseHooks.onAfter((promise) => {});
|
|
|
|
```
|
|
|
|
|
|
|
|
```cjs
|
2022-04-20 10:23:41 +02:00
|
|
|
const { promiseHooks } = require('node:v8');
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stop = promiseHooks.onAfter((promise) => {});
|
|
|
|
```
|
|
|
|
|
|
|
|
### `promiseHooks.createHook(callbacks)`
|
2021-11-01 15:38:59 -07:00
|
|
|
|
2021-07-04 17:43:26 -07:00
|
|
|
<!-- YAML
|
2022-02-01 00:34:51 -05:00
|
|
|
added:
|
|
|
|
- v17.1.0
|
|
|
|
- v16.14.0
|
2021-07-04 17:43:26 -07:00
|
|
|
-->
|
|
|
|
|
|
|
|
* `callbacks` {Object} The [Hook Callbacks][] to register
|
|
|
|
* `init` {Function} The [`init` callback][].
|
|
|
|
* `before` {Function} The [`before` callback][].
|
|
|
|
* `after` {Function} The [`after` callback][].
|
|
|
|
* `settled` {Function} The [`settled` callback][].
|
|
|
|
* Returns: {Function} Used for disabling hooks
|
|
|
|
|
|
|
|
**The hook callbacks must be plain functions. Providing async functions will
|
|
|
|
throw as it would produce an infinite microtask loop.**
|
|
|
|
|
|
|
|
Registers functions to be called for different lifetime events of each promise.
|
|
|
|
|
|
|
|
The callbacks `init()`/`before()`/`after()`/`settled()` are called for the
|
|
|
|
respective events during a promise's lifetime.
|
|
|
|
|
|
|
|
All callbacks are optional. For example, if only promise creation needs to
|
|
|
|
be tracked, then only the `init` callback needs to be passed. The
|
|
|
|
specifics of all functions that can be passed to `callbacks` is in the
|
|
|
|
[Hook Callbacks][] section.
|
|
|
|
|
|
|
|
```mjs
|
2022-04-20 10:23:41 +02:00
|
|
|
import { promiseHooks } from 'node:v8';
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stopAll = promiseHooks.createHook({
|
2022-11-17 08:19:12 -05:00
|
|
|
init(promise, parent) {},
|
2021-07-04 17:43:26 -07:00
|
|
|
});
|
|
|
|
```
|
|
|
|
|
|
|
|
```cjs
|
2022-04-20 10:23:41 +02:00
|
|
|
const { promiseHooks } = require('node:v8');
|
2021-07-04 17:43:26 -07:00
|
|
|
|
|
|
|
const stopAll = promiseHooks.createHook({
|
2022-11-17 08:19:12 -05:00
|
|
|
init(promise, parent) {},
|
2021-07-04 17:43:26 -07:00
|
|
|
});
|
|
|
|
```
|
|
|
|
|
|
|
|
### Hook callbacks
|
|
|
|
|
|
|
|
Key events in the lifetime of a promise have been categorized into four areas:
|
|
|
|
creation of a promise, before/after a continuation handler is called or around
|
|
|
|
an await, and when the promise resolves or rejects.
|
|
|
|
|
|
|
|
While these hooks are similar to those of [`async_hooks`][] they lack a
|
|
|
|
`destroy` hook. Other types of async resources typically represent sockets or
|
|
|
|
file descriptors which have a distinct "closed" state to express the `destroy`
|
|
|
|
lifecycle event while promises remain usable for as long as code can still
|
|
|
|
reach them. Garbage collection tracking is used to make promises fit into the
|
|
|
|
`async_hooks` event model, however this tracking is very expensive and they may
|
|
|
|
not necessarily ever even be garbage collected.
|
|
|
|
|
|
|
|
Because promises are asynchronous resources whose lifecycle is tracked
|
|
|
|
via the promise hooks mechanism, the `init()`, `before()`, `after()`, and
|
2021-11-01 15:38:59 -07:00
|
|
|
`settled()` callbacks _must not_ be async functions as they create more
|
2021-07-04 17:43:26 -07:00
|
|
|
promises which would produce an infinite loop.
|
|
|
|
|
|
|
|
While this API is used to feed promise events into [`async_hooks`][], the
|
2022-03-06 10:12:28 -08:00
|
|
|
ordering between the two is undefined. Both APIs are multi-tenant
|
2021-07-04 17:43:26 -07:00
|
|
|
and therefore could produce events in any order relative to each other.
|
|
|
|
|
|
|
|
#### `init(promise, parent)`
|
|
|
|
|
|
|
|
* `promise` {Promise} The promise being created.
|
|
|
|
* `parent` {Promise} The promise continued from, if applicable.
|
|
|
|
|
|
|
|
Called when a promise is constructed. This _does not_ mean that corresponding
|
|
|
|
`before`/`after` events will occur, only that the possibility exists. This will
|
|
|
|
happen if a promise is created without ever getting a continuation.
|
|
|
|
|
|
|
|
#### `before(promise)`
|
|
|
|
|
|
|
|
* `promise` {Promise}
|
|
|
|
|
|
|
|
Called before a promise continuation executes. This can be in the form of
|
|
|
|
`then()`, `catch()`, or `finally()` handlers or an `await` resuming.
|
|
|
|
|
|
|
|
The `before` callback will be called 0 to N times. The `before` callback
|
|
|
|
will typically be called 0 times if no continuation was ever made for the
|
|
|
|
promise. The `before` callback may be called many times in the case where
|
|
|
|
many continuations have been made from the same promise.
|
|
|
|
|
|
|
|
#### `after(promise)`
|
|
|
|
|
|
|
|
* `promise` {Promise}
|
|
|
|
|
|
|
|
Called immediately after a promise continuation executes. This may be after a
|
|
|
|
`then()`, `catch()`, or `finally()` handler or before an `await` after another
|
|
|
|
`await`.
|
|
|
|
|
|
|
|
#### `settled(promise)`
|
|
|
|
|
|
|
|
* `promise` {Promise}
|
|
|
|
|
|
|
|
Called when the promise receives a resolution or rejection value. This may
|
|
|
|
occur synchronously in the case of `Promise.resolve()` or `Promise.reject()`.
|
|
|
|
|
2022-04-18 12:36:36 +08:00
|
|
|
## Startup Snapshot API
|
|
|
|
|
|
|
|
<!-- YAML
|
2022-08-16, Version 16.17.0 'Gallium' (LTS)
Notable changes:
Adds `util.parseArgs` helper for higher level command-line argument
parsing.
Contributed by Benjamin Coe, John Gee, Darcy Clarke, Joe Sepi,
Kevin Gibbons, Aaron Casanova, Jessica Nahulan, and Jordan Harband.
https://github.com/nodejs/node/pull/42675
Node.js ESM Loader hooks now support multiple custom loaders, and
composition is achieved via "chaining": `foo-loader` calls `bar-loader`
calls `qux-loader` (a custom loader _must_ now signal a short circuit
when intentionally not calling the next). See the ESM docs
(https://nodejs.org/dist/latest-v16.x/docs/api/esm.html) for details.
Contributed by Jacob Smith, Geoffrey Booth, and Bradley Farias.
https://github.com/nodejs/node/pull/42623
The `node:test` module, which was initially introduced in Node.js
v18.0.0, is now available with all the changes done to it up to Node.js
v18.7.0.
To better align Node.js' experimental implementation of the Web Crypto
API with other runtimes, several changes were made:
* Support for CFRG curves was added, with the `'Ed25519'`, `'Ed448'`,
`'X25519'`, and `'X448'` algorithms.
* The proprietary `'NODE-DSA'`, `'NODE-DH'`, `'NODE-SCRYPT'`,
`'NODE-ED25519'`, `'NODE-ED448'`, `'NODE-X25519'`, and `'NODE-X448'`
algorithms were removed.
* The proprietary `'node.keyObject'` import/export format was removed.
Contributed by Filip Skokan.
https://github.com/nodejs/node/pull/42507
https://github.com/nodejs/node/pull/43310
Updated Corepack to 0.12.1 - https://github.com/nodejs/node/pull/43965
Updated ICU to 71.1 - https://github.com/nodejs/node/pull/42655
Updated npm to 8.15.0 - https://github.com/nodejs/node/pull/43917
Updated Undici to 5.8.0 - https://github.com/nodejs/node/pull/43886
(SEMVER-MINOR) crypto: make authTagLength optional for CC20P1305 (Tobias Nießen) https://github.com/nodejs/node/pull/42427
(SEMVER-MINOR) crypto: align webcrypto RSA key import/export with other implementations (Filip Skokan) https://github.com/nodejs/node/pull/42816
(SEMVER-MINOR) dns: export error code constants from `dns/promises` (Feng Yu) https://github.com/nodejs/node/pull/43176
doc: deprecate coercion to integer in process.exit (Daeyeon Jeong) https://github.com/nodejs/node/pull/43738
(SEMVER-MINOR) doc: deprecate diagnostics_channel object subscribe method (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) errors: add support for cause in aborterror (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) events: expose CustomEvent on global with CLI flag (Daeyeon Jeong) https://github.com/nodejs/node/pull/43885
(SEMVER-MINOR) events: add `CustomEvent` (Daeyeon Jeong) https://github.com/nodejs/node/pull/43514
(SEMVER-MINOR) events: propagate abortsignal reason in new AbortError ctor in events (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: propagate abortsignal reason in new AbortSignal constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: make params in writing methods optional (LiviaMedeiros) https://github.com/nodejs/node/pull/42601
(SEMVER-MINOR) fs: add `read(buffer[, options])` versions (LiviaMedeiros) https://github.com/nodejs/node/pull/42768
(SEMVER-MINOR) http: add drop request event for http server (theanarkh) https://github.com/nodejs/node/pull/43806
(SEMVER-MINOR) http: add diagnostics channel for http client (theanarkh) https://github.com/nodejs/node/pull/43580
(SEMVER-MINOR) http: add perf_hooks detail for http request and client (theanarkh) https://github.com/nodejs/node/pull/43361
(SEMVER-MINOR) http: add uniqueHeaders option to request and createServer (Paolo Insogna) https://github.com/nodejs/node/pull/41397
(SEMVER-MINOR) http2: propagate abortsignal reason in new AbortError constructor (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) http2: compat support for array headers (OneNail) https://github.com/nodejs/node/pull/42901
(SEMVER-MINOR) lib: propagate abortsignal reason in new AbortError constructor in blob (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) lib: add abortSignal.throwIfAborted() (James M Snell) https://github.com/nodejs/node/pull/40951
(SEMVER-MINOR) lib: improved diagnostics_channel subscribe/unsubscribe (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) module: add isBuiltIn method (hemanth.hm) https://github.com/nodejs/node/pull/43396
(SEMVER-MINOR) module,repl: support 'node:'-only core modules (Colin Ihrig) https://github.com/nodejs/node/pull/42325
(SEMVER-MINOR) net: add drop event for net server (theanarkh) https://github.com/nodejs/node/pull/43582
(SEMVER-MINOR) net: add ability to reset a tcp socket (pupilTong) https://github.com/nodejs/node/pull/43112
(SEMVER-MINOR) node-api: emit uncaught-exception on unhandled tsfn callbacks (Chengzhong Wu) https://github.com/nodejs/node/pull/36510
(SEMVER-MINOR) perf_hooks: add PerformanceResourceTiming (RafaelGSS) https://github.com/nodejs/node/pull/42725
(SEMVER-MINOR) report: add more heap infos in process report (theanarkh) https://github.com/nodejs/node/pull/43116
(SEMVER-MINOR) src: add --openssl-legacy-provider option (Daniel Bevenius) https://github.com/nodejs/node/pull/40478
(SEMVER-MINOR) src: define fs.constants.S_IWUSR & S_IRUSR for Win (Liviu Ionescu) https://github.com/nodejs/node/pull/42757
(SEMVER-MINOR) src,doc,test: add --openssl-shared-config option (Daniel Bevenius) https://github.com/nodejs/node/pull/43124
(SEMVER-MINOR) stream: use cause options in AbortError constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) stream: add iterator helper find (Nitzan Uziely) https://github.com/nodejs/node/pull/41849
(SEMVER-MINOR) stream: add writableAborted (Robert Nagy) https://github.com/nodejs/node/pull/40802
(SEMVER-MINOR) timers: propagate signal.reason in awaitable timers (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) v8: add v8.startupSnapshot utils (Joyee Cheung) https://github.com/nodejs/node/pull/43329
(SEMVER-MINOR) v8: export more fields in getHeapStatistics (theanarkh) https://github.com/nodejs/node/pull/42784
(SEMVER-MINOR) worker: add hasRef() to MessagePort (Darshan Sen) https://github.com/nodejs/node/pull/42849
PR-URL: https://github.com/nodejs/node/pull/44098
2022-08-02 14:34:18 +02:00
|
|
|
added:
|
|
|
|
- v18.6.0
|
|
|
|
- v16.17.0
|
2022-04-18 12:36:36 +08:00
|
|
|
-->
|
|
|
|
|
|
|
|
> Stability: 1 - Experimental
|
|
|
|
|
|
|
|
The `v8.startupSnapshot` interface can be used to add serialization and
|
2023-05-03 15:14:56 +02:00
|
|
|
deserialization hooks for custom startup snapshots.
|
2022-04-18 12:36:36 +08:00
|
|
|
|
|
|
|
```console
|
2023-05-03 15:14:56 +02:00
|
|
|
$ node --snapshot-blob snapshot.blob --build-snapshot entry.js
|
|
|
|
# This launches a process with the snapshot
|
|
|
|
$ node --snapshot-blob snapshot.blob
|
2022-04-18 12:36:36 +08:00
|
|
|
```
|
|
|
|
|
|
|
|
In the example above, `entry.js` can use methods from the `v8.startupSnapshot`
|
|
|
|
interface to specify how to save information for custom objects in the snapshot
|
|
|
|
during serialization and how the information can be used to synchronize these
|
|
|
|
objects during deserialization of the snapshot. For example, if the `entry.js`
|
|
|
|
contains the following script:
|
|
|
|
|
|
|
|
```cjs
|
|
|
|
'use strict';
|
|
|
|
|
2022-11-06 06:53:23 +09:00
|
|
|
const fs = require('node:fs');
|
|
|
|
const zlib = require('node:zlib');
|
|
|
|
const path = require('node:path');
|
|
|
|
const assert = require('node:assert');
|
2022-04-18 12:36:36 +08:00
|
|
|
|
2023-05-03 15:14:56 +02:00
|
|
|
const v8 = require('node:v8');
|
2022-04-18 12:36:36 +08:00
|
|
|
|
2023-05-03 15:14:56 +02:00
|
|
|
class BookShelf {
|
|
|
|
storage = new Map();
|
2022-04-18 12:36:36 +08:00
|
|
|
|
2023-05-03 15:14:56 +02:00
|
|
|
// Reading a series of files from directory and store them into storage.
|
|
|
|
constructor(directory, books) {
|
|
|
|
for (const book of books) {
|
|
|
|
this.storage.set(book, fs.readFileSync(path.join(directory, book)));
|
|
|
|
}
|
|
|
|
}
|
2022-04-18 12:36:36 +08:00
|
|
|
|
2023-05-03 15:14:56 +02:00
|
|
|
static compressAll(shelf) {
|
|
|
|
for (const [ book, content ] of shelf.storage) {
|
|
|
|
shelf.storage.set(book, zlib.gzipSync(content));
|
|
|
|
}
|
|
|
|
}
|
2022-04-18 12:36:36 +08:00
|
|
|
|
2023-05-03 15:14:56 +02:00
|
|
|
static decompressAll(shelf) {
|
|
|
|
for (const [ book, content ] of shelf.storage) {
|
|
|
|
shelf.storage.set(book, zlib.gunzipSync(content));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2022-04-18 12:36:36 +08:00
|
|
|
|
2023-05-03 15:14:56 +02:00
|
|
|
// __dirname here is where the snapshot script is placed
|
|
|
|
// during snapshot building time.
|
|
|
|
const shelf = new BookShelf(__dirname, [
|
|
|
|
'book1.en_US.txt',
|
|
|
|
'book1.es_ES.txt',
|
|
|
|
'book2.zh_CN.txt',
|
|
|
|
]);
|
|
|
|
|
|
|
|
assert(v8.startupSnapshot.isBuildingSnapshot());
|
|
|
|
// On snapshot serialization, compress the books to reduce size.
|
|
|
|
v8.startupSnapshot.addSerializeCallback(BookShelf.compressAll, shelf);
|
|
|
|
// On snapshot deserialization, decompress the books.
|
|
|
|
v8.startupSnapshot.addDeserializeCallback(BookShelf.decompressAll, shelf);
|
|
|
|
v8.startupSnapshot.setDeserializeMainFunction((shelf) => {
|
|
|
|
// process.env and process.argv are refreshed during snapshot
|
|
|
|
// deserialization.
|
|
|
|
const lang = process.env.BOOK_LANG || 'en_US';
|
|
|
|
const book = process.argv[1];
|
|
|
|
const name = `${book}.${lang}.txt`;
|
|
|
|
console.log(shelf.storage.get(name));
|
|
|
|
}, shelf);
|
2022-04-18 12:36:36 +08:00
|
|
|
```
|
|
|
|
|
2023-05-03 15:14:56 +02:00
|
|
|
The resulted binary will get print the data deserialized from the snapshot
|
|
|
|
during start up, using the refreshed `process.env` and `process.argv` of
|
|
|
|
the launched process:
|
2022-04-18 12:36:36 +08:00
|
|
|
|
|
|
|
```console
|
2023-05-03 15:14:56 +02:00
|
|
|
$ BOOK_LANG=es_ES node --snapshot-blob snapshot.blob book1
|
|
|
|
# Prints content of book1.es_ES.txt deserialized from the snapshot.
|
2022-04-18 12:36:36 +08:00
|
|
|
```
|
|
|
|
|
2023-05-03 15:14:56 +02:00
|
|
|
Currently the application deserialized from a user-land snapshot cannot
|
|
|
|
be snapshotted again, so these APIs are only available to applications
|
|
|
|
that are not deserialized from a user-land snapshot.
|
2022-04-18 12:36:36 +08:00
|
|
|
|
|
|
|
### `v8.startupSnapshot.addSerializeCallback(callback[, data])`
|
|
|
|
|
|
|
|
<!-- YAML
|
2022-08-16, Version 16.17.0 'Gallium' (LTS)
Notable changes:
Adds `util.parseArgs` helper for higher level command-line argument
parsing.
Contributed by Benjamin Coe, John Gee, Darcy Clarke, Joe Sepi,
Kevin Gibbons, Aaron Casanova, Jessica Nahulan, and Jordan Harband.
https://github.com/nodejs/node/pull/42675
Node.js ESM Loader hooks now support multiple custom loaders, and
composition is achieved via "chaining": `foo-loader` calls `bar-loader`
calls `qux-loader` (a custom loader _must_ now signal a short circuit
when intentionally not calling the next). See the ESM docs
(https://nodejs.org/dist/latest-v16.x/docs/api/esm.html) for details.
Contributed by Jacob Smith, Geoffrey Booth, and Bradley Farias.
https://github.com/nodejs/node/pull/42623
The `node:test` module, which was initially introduced in Node.js
v18.0.0, is now available with all the changes done to it up to Node.js
v18.7.0.
To better align Node.js' experimental implementation of the Web Crypto
API with other runtimes, several changes were made:
* Support for CFRG curves was added, with the `'Ed25519'`, `'Ed448'`,
`'X25519'`, and `'X448'` algorithms.
* The proprietary `'NODE-DSA'`, `'NODE-DH'`, `'NODE-SCRYPT'`,
`'NODE-ED25519'`, `'NODE-ED448'`, `'NODE-X25519'`, and `'NODE-X448'`
algorithms were removed.
* The proprietary `'node.keyObject'` import/export format was removed.
Contributed by Filip Skokan.
https://github.com/nodejs/node/pull/42507
https://github.com/nodejs/node/pull/43310
Updated Corepack to 0.12.1 - https://github.com/nodejs/node/pull/43965
Updated ICU to 71.1 - https://github.com/nodejs/node/pull/42655
Updated npm to 8.15.0 - https://github.com/nodejs/node/pull/43917
Updated Undici to 5.8.0 - https://github.com/nodejs/node/pull/43886
(SEMVER-MINOR) crypto: make authTagLength optional for CC20P1305 (Tobias Nießen) https://github.com/nodejs/node/pull/42427
(SEMVER-MINOR) crypto: align webcrypto RSA key import/export with other implementations (Filip Skokan) https://github.com/nodejs/node/pull/42816
(SEMVER-MINOR) dns: export error code constants from `dns/promises` (Feng Yu) https://github.com/nodejs/node/pull/43176
doc: deprecate coercion to integer in process.exit (Daeyeon Jeong) https://github.com/nodejs/node/pull/43738
(SEMVER-MINOR) doc: deprecate diagnostics_channel object subscribe method (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) errors: add support for cause in aborterror (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) events: expose CustomEvent on global with CLI flag (Daeyeon Jeong) https://github.com/nodejs/node/pull/43885
(SEMVER-MINOR) events: add `CustomEvent` (Daeyeon Jeong) https://github.com/nodejs/node/pull/43514
(SEMVER-MINOR) events: propagate abortsignal reason in new AbortError ctor in events (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: propagate abortsignal reason in new AbortSignal constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: make params in writing methods optional (LiviaMedeiros) https://github.com/nodejs/node/pull/42601
(SEMVER-MINOR) fs: add `read(buffer[, options])` versions (LiviaMedeiros) https://github.com/nodejs/node/pull/42768
(SEMVER-MINOR) http: add drop request event for http server (theanarkh) https://github.com/nodejs/node/pull/43806
(SEMVER-MINOR) http: add diagnostics channel for http client (theanarkh) https://github.com/nodejs/node/pull/43580
(SEMVER-MINOR) http: add perf_hooks detail for http request and client (theanarkh) https://github.com/nodejs/node/pull/43361
(SEMVER-MINOR) http: add uniqueHeaders option to request and createServer (Paolo Insogna) https://github.com/nodejs/node/pull/41397
(SEMVER-MINOR) http2: propagate abortsignal reason in new AbortError constructor (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) http2: compat support for array headers (OneNail) https://github.com/nodejs/node/pull/42901
(SEMVER-MINOR) lib: propagate abortsignal reason in new AbortError constructor in blob (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) lib: add abortSignal.throwIfAborted() (James M Snell) https://github.com/nodejs/node/pull/40951
(SEMVER-MINOR) lib: improved diagnostics_channel subscribe/unsubscribe (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) module: add isBuiltIn method (hemanth.hm) https://github.com/nodejs/node/pull/43396
(SEMVER-MINOR) module,repl: support 'node:'-only core modules (Colin Ihrig) https://github.com/nodejs/node/pull/42325
(SEMVER-MINOR) net: add drop event for net server (theanarkh) https://github.com/nodejs/node/pull/43582
(SEMVER-MINOR) net: add ability to reset a tcp socket (pupilTong) https://github.com/nodejs/node/pull/43112
(SEMVER-MINOR) node-api: emit uncaught-exception on unhandled tsfn callbacks (Chengzhong Wu) https://github.com/nodejs/node/pull/36510
(SEMVER-MINOR) perf_hooks: add PerformanceResourceTiming (RafaelGSS) https://github.com/nodejs/node/pull/42725
(SEMVER-MINOR) report: add more heap infos in process report (theanarkh) https://github.com/nodejs/node/pull/43116
(SEMVER-MINOR) src: add --openssl-legacy-provider option (Daniel Bevenius) https://github.com/nodejs/node/pull/40478
(SEMVER-MINOR) src: define fs.constants.S_IWUSR & S_IRUSR for Win (Liviu Ionescu) https://github.com/nodejs/node/pull/42757
(SEMVER-MINOR) src,doc,test: add --openssl-shared-config option (Daniel Bevenius) https://github.com/nodejs/node/pull/43124
(SEMVER-MINOR) stream: use cause options in AbortError constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) stream: add iterator helper find (Nitzan Uziely) https://github.com/nodejs/node/pull/41849
(SEMVER-MINOR) stream: add writableAborted (Robert Nagy) https://github.com/nodejs/node/pull/40802
(SEMVER-MINOR) timers: propagate signal.reason in awaitable timers (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) v8: add v8.startupSnapshot utils (Joyee Cheung) https://github.com/nodejs/node/pull/43329
(SEMVER-MINOR) v8: export more fields in getHeapStatistics (theanarkh) https://github.com/nodejs/node/pull/42784
(SEMVER-MINOR) worker: add hasRef() to MessagePort (Darshan Sen) https://github.com/nodejs/node/pull/42849
PR-URL: https://github.com/nodejs/node/pull/44098
2022-08-02 14:34:18 +02:00
|
|
|
added:
|
|
|
|
- v18.6.0
|
|
|
|
- v16.17.0
|
2022-04-18 12:36:36 +08:00
|
|
|
-->
|
|
|
|
|
|
|
|
* `callback` {Function} Callback to be invoked before serialization.
|
|
|
|
* `data` {any} Optional data that will be passed to the `callback` when it
|
|
|
|
gets called.
|
|
|
|
|
|
|
|
Add a callback that will be called when the Node.js instance is about to
|
|
|
|
get serialized into a snapshot and exit. This can be used to release
|
|
|
|
resources that should not or cannot be serialized or to convert user data
|
|
|
|
into a form more suitable for serialization.
|
|
|
|
|
2024-02-29 21:55:00 +01:00
|
|
|
Callbacks are run in the order in which they are added.
|
|
|
|
|
2022-04-18 12:36:36 +08:00
|
|
|
### `v8.startupSnapshot.addDeserializeCallback(callback[, data])`
|
|
|
|
|
|
|
|
<!-- YAML
|
2022-08-16, Version 16.17.0 'Gallium' (LTS)
Notable changes:
Adds `util.parseArgs` helper for higher level command-line argument
parsing.
Contributed by Benjamin Coe, John Gee, Darcy Clarke, Joe Sepi,
Kevin Gibbons, Aaron Casanova, Jessica Nahulan, and Jordan Harband.
https://github.com/nodejs/node/pull/42675
Node.js ESM Loader hooks now support multiple custom loaders, and
composition is achieved via "chaining": `foo-loader` calls `bar-loader`
calls `qux-loader` (a custom loader _must_ now signal a short circuit
when intentionally not calling the next). See the ESM docs
(https://nodejs.org/dist/latest-v16.x/docs/api/esm.html) for details.
Contributed by Jacob Smith, Geoffrey Booth, and Bradley Farias.
https://github.com/nodejs/node/pull/42623
The `node:test` module, which was initially introduced in Node.js
v18.0.0, is now available with all the changes done to it up to Node.js
v18.7.0.
To better align Node.js' experimental implementation of the Web Crypto
API with other runtimes, several changes were made:
* Support for CFRG curves was added, with the `'Ed25519'`, `'Ed448'`,
`'X25519'`, and `'X448'` algorithms.
* The proprietary `'NODE-DSA'`, `'NODE-DH'`, `'NODE-SCRYPT'`,
`'NODE-ED25519'`, `'NODE-ED448'`, `'NODE-X25519'`, and `'NODE-X448'`
algorithms were removed.
* The proprietary `'node.keyObject'` import/export format was removed.
Contributed by Filip Skokan.
https://github.com/nodejs/node/pull/42507
https://github.com/nodejs/node/pull/43310
Updated Corepack to 0.12.1 - https://github.com/nodejs/node/pull/43965
Updated ICU to 71.1 - https://github.com/nodejs/node/pull/42655
Updated npm to 8.15.0 - https://github.com/nodejs/node/pull/43917
Updated Undici to 5.8.0 - https://github.com/nodejs/node/pull/43886
(SEMVER-MINOR) crypto: make authTagLength optional for CC20P1305 (Tobias Nießen) https://github.com/nodejs/node/pull/42427
(SEMVER-MINOR) crypto: align webcrypto RSA key import/export with other implementations (Filip Skokan) https://github.com/nodejs/node/pull/42816
(SEMVER-MINOR) dns: export error code constants from `dns/promises` (Feng Yu) https://github.com/nodejs/node/pull/43176
doc: deprecate coercion to integer in process.exit (Daeyeon Jeong) https://github.com/nodejs/node/pull/43738
(SEMVER-MINOR) doc: deprecate diagnostics_channel object subscribe method (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) errors: add support for cause in aborterror (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) events: expose CustomEvent on global with CLI flag (Daeyeon Jeong) https://github.com/nodejs/node/pull/43885
(SEMVER-MINOR) events: add `CustomEvent` (Daeyeon Jeong) https://github.com/nodejs/node/pull/43514
(SEMVER-MINOR) events: propagate abortsignal reason in new AbortError ctor in events (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: propagate abortsignal reason in new AbortSignal constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: make params in writing methods optional (LiviaMedeiros) https://github.com/nodejs/node/pull/42601
(SEMVER-MINOR) fs: add `read(buffer[, options])` versions (LiviaMedeiros) https://github.com/nodejs/node/pull/42768
(SEMVER-MINOR) http: add drop request event for http server (theanarkh) https://github.com/nodejs/node/pull/43806
(SEMVER-MINOR) http: add diagnostics channel for http client (theanarkh) https://github.com/nodejs/node/pull/43580
(SEMVER-MINOR) http: add perf_hooks detail for http request and client (theanarkh) https://github.com/nodejs/node/pull/43361
(SEMVER-MINOR) http: add uniqueHeaders option to request and createServer (Paolo Insogna) https://github.com/nodejs/node/pull/41397
(SEMVER-MINOR) http2: propagate abortsignal reason in new AbortError constructor (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) http2: compat support for array headers (OneNail) https://github.com/nodejs/node/pull/42901
(SEMVER-MINOR) lib: propagate abortsignal reason in new AbortError constructor in blob (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) lib: add abortSignal.throwIfAborted() (James M Snell) https://github.com/nodejs/node/pull/40951
(SEMVER-MINOR) lib: improved diagnostics_channel subscribe/unsubscribe (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) module: add isBuiltIn method (hemanth.hm) https://github.com/nodejs/node/pull/43396
(SEMVER-MINOR) module,repl: support 'node:'-only core modules (Colin Ihrig) https://github.com/nodejs/node/pull/42325
(SEMVER-MINOR) net: add drop event for net server (theanarkh) https://github.com/nodejs/node/pull/43582
(SEMVER-MINOR) net: add ability to reset a tcp socket (pupilTong) https://github.com/nodejs/node/pull/43112
(SEMVER-MINOR) node-api: emit uncaught-exception on unhandled tsfn callbacks (Chengzhong Wu) https://github.com/nodejs/node/pull/36510
(SEMVER-MINOR) perf_hooks: add PerformanceResourceTiming (RafaelGSS) https://github.com/nodejs/node/pull/42725
(SEMVER-MINOR) report: add more heap infos in process report (theanarkh) https://github.com/nodejs/node/pull/43116
(SEMVER-MINOR) src: add --openssl-legacy-provider option (Daniel Bevenius) https://github.com/nodejs/node/pull/40478
(SEMVER-MINOR) src: define fs.constants.S_IWUSR & S_IRUSR for Win (Liviu Ionescu) https://github.com/nodejs/node/pull/42757
(SEMVER-MINOR) src,doc,test: add --openssl-shared-config option (Daniel Bevenius) https://github.com/nodejs/node/pull/43124
(SEMVER-MINOR) stream: use cause options in AbortError constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) stream: add iterator helper find (Nitzan Uziely) https://github.com/nodejs/node/pull/41849
(SEMVER-MINOR) stream: add writableAborted (Robert Nagy) https://github.com/nodejs/node/pull/40802
(SEMVER-MINOR) timers: propagate signal.reason in awaitable timers (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) v8: add v8.startupSnapshot utils (Joyee Cheung) https://github.com/nodejs/node/pull/43329
(SEMVER-MINOR) v8: export more fields in getHeapStatistics (theanarkh) https://github.com/nodejs/node/pull/42784
(SEMVER-MINOR) worker: add hasRef() to MessagePort (Darshan Sen) https://github.com/nodejs/node/pull/42849
PR-URL: https://github.com/nodejs/node/pull/44098
2022-08-02 14:34:18 +02:00
|
|
|
added:
|
|
|
|
- v18.6.0
|
|
|
|
- v16.17.0
|
2022-04-18 12:36:36 +08:00
|
|
|
-->
|
|
|
|
|
|
|
|
* `callback` {Function} Callback to be invoked after the snapshot is
|
|
|
|
deserialized.
|
|
|
|
* `data` {any} Optional data that will be passed to the `callback` when it
|
|
|
|
gets called.
|
|
|
|
|
|
|
|
Add a callback that will be called when the Node.js instance is deserialized
|
|
|
|
from a snapshot. The `callback` and the `data` (if provided) will be
|
|
|
|
serialized into the snapshot, they can be used to re-initialize the state
|
|
|
|
of the application or to re-acquire resources that the application needs
|
|
|
|
when the application is restarted from the snapshot.
|
|
|
|
|
2024-02-29 21:55:00 +01:00
|
|
|
Callbacks are run in the order in which they are added.
|
|
|
|
|
2022-04-18 12:36:36 +08:00
|
|
|
### `v8.startupSnapshot.setDeserializeMainFunction(callback[, data])`
|
|
|
|
|
|
|
|
<!-- YAML
|
2022-08-16, Version 16.17.0 'Gallium' (LTS)
Notable changes:
Adds `util.parseArgs` helper for higher level command-line argument
parsing.
Contributed by Benjamin Coe, John Gee, Darcy Clarke, Joe Sepi,
Kevin Gibbons, Aaron Casanova, Jessica Nahulan, and Jordan Harband.
https://github.com/nodejs/node/pull/42675
Node.js ESM Loader hooks now support multiple custom loaders, and
composition is achieved via "chaining": `foo-loader` calls `bar-loader`
calls `qux-loader` (a custom loader _must_ now signal a short circuit
when intentionally not calling the next). See the ESM docs
(https://nodejs.org/dist/latest-v16.x/docs/api/esm.html) for details.
Contributed by Jacob Smith, Geoffrey Booth, and Bradley Farias.
https://github.com/nodejs/node/pull/42623
The `node:test` module, which was initially introduced in Node.js
v18.0.0, is now available with all the changes done to it up to Node.js
v18.7.0.
To better align Node.js' experimental implementation of the Web Crypto
API with other runtimes, several changes were made:
* Support for CFRG curves was added, with the `'Ed25519'`, `'Ed448'`,
`'X25519'`, and `'X448'` algorithms.
* The proprietary `'NODE-DSA'`, `'NODE-DH'`, `'NODE-SCRYPT'`,
`'NODE-ED25519'`, `'NODE-ED448'`, `'NODE-X25519'`, and `'NODE-X448'`
algorithms were removed.
* The proprietary `'node.keyObject'` import/export format was removed.
Contributed by Filip Skokan.
https://github.com/nodejs/node/pull/42507
https://github.com/nodejs/node/pull/43310
Updated Corepack to 0.12.1 - https://github.com/nodejs/node/pull/43965
Updated ICU to 71.1 - https://github.com/nodejs/node/pull/42655
Updated npm to 8.15.0 - https://github.com/nodejs/node/pull/43917
Updated Undici to 5.8.0 - https://github.com/nodejs/node/pull/43886
(SEMVER-MINOR) crypto: make authTagLength optional for CC20P1305 (Tobias Nießen) https://github.com/nodejs/node/pull/42427
(SEMVER-MINOR) crypto: align webcrypto RSA key import/export with other implementations (Filip Skokan) https://github.com/nodejs/node/pull/42816
(SEMVER-MINOR) dns: export error code constants from `dns/promises` (Feng Yu) https://github.com/nodejs/node/pull/43176
doc: deprecate coercion to integer in process.exit (Daeyeon Jeong) https://github.com/nodejs/node/pull/43738
(SEMVER-MINOR) doc: deprecate diagnostics_channel object subscribe method (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) errors: add support for cause in aborterror (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) events: expose CustomEvent on global with CLI flag (Daeyeon Jeong) https://github.com/nodejs/node/pull/43885
(SEMVER-MINOR) events: add `CustomEvent` (Daeyeon Jeong) https://github.com/nodejs/node/pull/43514
(SEMVER-MINOR) events: propagate abortsignal reason in new AbortError ctor in events (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: propagate abortsignal reason in new AbortSignal constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: make params in writing methods optional (LiviaMedeiros) https://github.com/nodejs/node/pull/42601
(SEMVER-MINOR) fs: add `read(buffer[, options])` versions (LiviaMedeiros) https://github.com/nodejs/node/pull/42768
(SEMVER-MINOR) http: add drop request event for http server (theanarkh) https://github.com/nodejs/node/pull/43806
(SEMVER-MINOR) http: add diagnostics channel for http client (theanarkh) https://github.com/nodejs/node/pull/43580
(SEMVER-MINOR) http: add perf_hooks detail for http request and client (theanarkh) https://github.com/nodejs/node/pull/43361
(SEMVER-MINOR) http: add uniqueHeaders option to request and createServer (Paolo Insogna) https://github.com/nodejs/node/pull/41397
(SEMVER-MINOR) http2: propagate abortsignal reason in new AbortError constructor (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) http2: compat support for array headers (OneNail) https://github.com/nodejs/node/pull/42901
(SEMVER-MINOR) lib: propagate abortsignal reason in new AbortError constructor in blob (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) lib: add abortSignal.throwIfAborted() (James M Snell) https://github.com/nodejs/node/pull/40951
(SEMVER-MINOR) lib: improved diagnostics_channel subscribe/unsubscribe (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) module: add isBuiltIn method (hemanth.hm) https://github.com/nodejs/node/pull/43396
(SEMVER-MINOR) module,repl: support 'node:'-only core modules (Colin Ihrig) https://github.com/nodejs/node/pull/42325
(SEMVER-MINOR) net: add drop event for net server (theanarkh) https://github.com/nodejs/node/pull/43582
(SEMVER-MINOR) net: add ability to reset a tcp socket (pupilTong) https://github.com/nodejs/node/pull/43112
(SEMVER-MINOR) node-api: emit uncaught-exception on unhandled tsfn callbacks (Chengzhong Wu) https://github.com/nodejs/node/pull/36510
(SEMVER-MINOR) perf_hooks: add PerformanceResourceTiming (RafaelGSS) https://github.com/nodejs/node/pull/42725
(SEMVER-MINOR) report: add more heap infos in process report (theanarkh) https://github.com/nodejs/node/pull/43116
(SEMVER-MINOR) src: add --openssl-legacy-provider option (Daniel Bevenius) https://github.com/nodejs/node/pull/40478
(SEMVER-MINOR) src: define fs.constants.S_IWUSR & S_IRUSR for Win (Liviu Ionescu) https://github.com/nodejs/node/pull/42757
(SEMVER-MINOR) src,doc,test: add --openssl-shared-config option (Daniel Bevenius) https://github.com/nodejs/node/pull/43124
(SEMVER-MINOR) stream: use cause options in AbortError constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) stream: add iterator helper find (Nitzan Uziely) https://github.com/nodejs/node/pull/41849
(SEMVER-MINOR) stream: add writableAborted (Robert Nagy) https://github.com/nodejs/node/pull/40802
(SEMVER-MINOR) timers: propagate signal.reason in awaitable timers (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) v8: add v8.startupSnapshot utils (Joyee Cheung) https://github.com/nodejs/node/pull/43329
(SEMVER-MINOR) v8: export more fields in getHeapStatistics (theanarkh) https://github.com/nodejs/node/pull/42784
(SEMVER-MINOR) worker: add hasRef() to MessagePort (Darshan Sen) https://github.com/nodejs/node/pull/42849
PR-URL: https://github.com/nodejs/node/pull/44098
2022-08-02 14:34:18 +02:00
|
|
|
added:
|
|
|
|
- v18.6.0
|
|
|
|
- v16.17.0
|
2022-04-18 12:36:36 +08:00
|
|
|
-->
|
|
|
|
|
|
|
|
* `callback` {Function} Callback to be invoked as the entry point after the
|
|
|
|
snapshot is deserialized.
|
|
|
|
* `data` {any} Optional data that will be passed to the `callback` when it
|
|
|
|
gets called.
|
|
|
|
|
|
|
|
This sets the entry point of the Node.js application when it is deserialized
|
|
|
|
from a snapshot. This can be called only once in the snapshot building
|
|
|
|
script. If called, the deserialized application no longer needs an additional
|
|
|
|
entry point script to start up and will simply invoke the callback along with
|
|
|
|
the deserialized data (if provided), otherwise an entry point script still
|
|
|
|
needs to be provided to the deserialized application.
|
|
|
|
|
|
|
|
### `v8.startupSnapshot.isBuildingSnapshot()`
|
|
|
|
|
|
|
|
<!-- YAML
|
2022-08-16, Version 16.17.0 'Gallium' (LTS)
Notable changes:
Adds `util.parseArgs` helper for higher level command-line argument
parsing.
Contributed by Benjamin Coe, John Gee, Darcy Clarke, Joe Sepi,
Kevin Gibbons, Aaron Casanova, Jessica Nahulan, and Jordan Harband.
https://github.com/nodejs/node/pull/42675
Node.js ESM Loader hooks now support multiple custom loaders, and
composition is achieved via "chaining": `foo-loader` calls `bar-loader`
calls `qux-loader` (a custom loader _must_ now signal a short circuit
when intentionally not calling the next). See the ESM docs
(https://nodejs.org/dist/latest-v16.x/docs/api/esm.html) for details.
Contributed by Jacob Smith, Geoffrey Booth, and Bradley Farias.
https://github.com/nodejs/node/pull/42623
The `node:test` module, which was initially introduced in Node.js
v18.0.0, is now available with all the changes done to it up to Node.js
v18.7.0.
To better align Node.js' experimental implementation of the Web Crypto
API with other runtimes, several changes were made:
* Support for CFRG curves was added, with the `'Ed25519'`, `'Ed448'`,
`'X25519'`, and `'X448'` algorithms.
* The proprietary `'NODE-DSA'`, `'NODE-DH'`, `'NODE-SCRYPT'`,
`'NODE-ED25519'`, `'NODE-ED448'`, `'NODE-X25519'`, and `'NODE-X448'`
algorithms were removed.
* The proprietary `'node.keyObject'` import/export format was removed.
Contributed by Filip Skokan.
https://github.com/nodejs/node/pull/42507
https://github.com/nodejs/node/pull/43310
Updated Corepack to 0.12.1 - https://github.com/nodejs/node/pull/43965
Updated ICU to 71.1 - https://github.com/nodejs/node/pull/42655
Updated npm to 8.15.0 - https://github.com/nodejs/node/pull/43917
Updated Undici to 5.8.0 - https://github.com/nodejs/node/pull/43886
(SEMVER-MINOR) crypto: make authTagLength optional for CC20P1305 (Tobias Nießen) https://github.com/nodejs/node/pull/42427
(SEMVER-MINOR) crypto: align webcrypto RSA key import/export with other implementations (Filip Skokan) https://github.com/nodejs/node/pull/42816
(SEMVER-MINOR) dns: export error code constants from `dns/promises` (Feng Yu) https://github.com/nodejs/node/pull/43176
doc: deprecate coercion to integer in process.exit (Daeyeon Jeong) https://github.com/nodejs/node/pull/43738
(SEMVER-MINOR) doc: deprecate diagnostics_channel object subscribe method (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) errors: add support for cause in aborterror (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) events: expose CustomEvent on global with CLI flag (Daeyeon Jeong) https://github.com/nodejs/node/pull/43885
(SEMVER-MINOR) events: add `CustomEvent` (Daeyeon Jeong) https://github.com/nodejs/node/pull/43514
(SEMVER-MINOR) events: propagate abortsignal reason in new AbortError ctor in events (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: propagate abortsignal reason in new AbortSignal constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) fs: make params in writing methods optional (LiviaMedeiros) https://github.com/nodejs/node/pull/42601
(SEMVER-MINOR) fs: add `read(buffer[, options])` versions (LiviaMedeiros) https://github.com/nodejs/node/pull/42768
(SEMVER-MINOR) http: add drop request event for http server (theanarkh) https://github.com/nodejs/node/pull/43806
(SEMVER-MINOR) http: add diagnostics channel for http client (theanarkh) https://github.com/nodejs/node/pull/43580
(SEMVER-MINOR) http: add perf_hooks detail for http request and client (theanarkh) https://github.com/nodejs/node/pull/43361
(SEMVER-MINOR) http: add uniqueHeaders option to request and createServer (Paolo Insogna) https://github.com/nodejs/node/pull/41397
(SEMVER-MINOR) http2: propagate abortsignal reason in new AbortError constructor (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) http2: compat support for array headers (OneNail) https://github.com/nodejs/node/pull/42901
(SEMVER-MINOR) lib: propagate abortsignal reason in new AbortError constructor in blob (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) lib: add abortSignal.throwIfAborted() (James M Snell) https://github.com/nodejs/node/pull/40951
(SEMVER-MINOR) lib: improved diagnostics_channel subscribe/unsubscribe (Stephen Belanger) https://github.com/nodejs/node/pull/42714
(SEMVER-MINOR) module: add isBuiltIn method (hemanth.hm) https://github.com/nodejs/node/pull/43396
(SEMVER-MINOR) module,repl: support 'node:'-only core modules (Colin Ihrig) https://github.com/nodejs/node/pull/42325
(SEMVER-MINOR) net: add drop event for net server (theanarkh) https://github.com/nodejs/node/pull/43582
(SEMVER-MINOR) net: add ability to reset a tcp socket (pupilTong) https://github.com/nodejs/node/pull/43112
(SEMVER-MINOR) node-api: emit uncaught-exception on unhandled tsfn callbacks (Chengzhong Wu) https://github.com/nodejs/node/pull/36510
(SEMVER-MINOR) perf_hooks: add PerformanceResourceTiming (RafaelGSS) https://github.com/nodejs/node/pull/42725
(SEMVER-MINOR) report: add more heap infos in process report (theanarkh) https://github.com/nodejs/node/pull/43116
(SEMVER-MINOR) src: add --openssl-legacy-provider option (Daniel Bevenius) https://github.com/nodejs/node/pull/40478
(SEMVER-MINOR) src: define fs.constants.S_IWUSR & S_IRUSR for Win (Liviu Ionescu) https://github.com/nodejs/node/pull/42757
(SEMVER-MINOR) src,doc,test: add --openssl-shared-config option (Daniel Bevenius) https://github.com/nodejs/node/pull/43124
(SEMVER-MINOR) stream: use cause options in AbortError constructors (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) stream: add iterator helper find (Nitzan Uziely) https://github.com/nodejs/node/pull/41849
(SEMVER-MINOR) stream: add writableAborted (Robert Nagy) https://github.com/nodejs/node/pull/40802
(SEMVER-MINOR) timers: propagate signal.reason in awaitable timers (James M Snell) https://github.com/nodejs/node/pull/41008
(SEMVER-MINOR) v8: add v8.startupSnapshot utils (Joyee Cheung) https://github.com/nodejs/node/pull/43329
(SEMVER-MINOR) v8: export more fields in getHeapStatistics (theanarkh) https://github.com/nodejs/node/pull/42784
(SEMVER-MINOR) worker: add hasRef() to MessagePort (Darshan Sen) https://github.com/nodejs/node/pull/42849
PR-URL: https://github.com/nodejs/node/pull/44098
2022-08-02 14:34:18 +02:00
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added:
|
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- v18.6.0
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- v16.17.0
|
2022-04-18 12:36:36 +08:00
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-->
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* Returns: {boolean}
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Returns true if the Node.js instance is run to build a snapshot.
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2023-01-25 20:02:09 +08:00
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## Class: `v8.GCProfiler`
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<!-- YAML
|
2023-03-04 23:12:52 -05:00
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added:
|
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|
- v19.6.0
|
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- v18.15.0
|
2023-01-25 20:02:09 +08:00
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-->
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This API collects GC data in current thread.
|
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### `new v8.GCProfiler()`
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<!-- YAML
|
2023-03-04 23:12:52 -05:00
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added:
|
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|
- v19.6.0
|
|
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- v18.15.0
|
2023-01-25 20:02:09 +08:00
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-->
|
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Create a new instance of the `v8.GCProfiler` class.
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### `profiler.start()`
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<!-- YAML
|
2023-03-04 23:12:52 -05:00
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added:
|
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|
- v19.6.0
|
|
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- v18.15.0
|
2023-01-25 20:02:09 +08:00
|
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-->
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Start collecting GC data.
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### `profiler.stop()`
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<!-- YAML
|
2023-03-04 23:12:52 -05:00
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added:
|
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|
- v19.6.0
|
|
|
|
- v18.15.0
|
2023-01-25 20:02:09 +08:00
|
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|
-->
|
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|
2023-01-29 11:32:23 +08:00
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|
Stop collecting GC data and return an object.The content of object
|
2023-01-25 20:02:09 +08:00
|
|
|
is as follows.
|
|
|
|
|
|
|
|
```json
|
|
|
|
{
|
|
|
|
"version": 1,
|
|
|
|
"startTime": 1674059033862,
|
|
|
|
"statistics": [
|
|
|
|
{
|
|
|
|
"gcType": "Scavenge",
|
|
|
|
"beforeGC": {
|
|
|
|
"heapStatistics": {
|
|
|
|
"totalHeapSize": 5005312,
|
|
|
|
"totalHeapSizeExecutable": 524288,
|
|
|
|
"totalPhysicalSize": 5226496,
|
|
|
|
"totalAvailableSize": 4341325216,
|
|
|
|
"totalGlobalHandlesSize": 8192,
|
|
|
|
"usedGlobalHandlesSize": 2112,
|
|
|
|
"usedHeapSize": 4883840,
|
|
|
|
"heapSizeLimit": 4345298944,
|
|
|
|
"mallocedMemory": 254128,
|
|
|
|
"externalMemory": 225138,
|
|
|
|
"peakMallocedMemory": 181760
|
|
|
|
},
|
|
|
|
"heapSpaceStatistics": [
|
|
|
|
{
|
|
|
|
"spaceName": "read_only_space",
|
|
|
|
"spaceSize": 0,
|
|
|
|
"spaceUsedSize": 0,
|
|
|
|
"spaceAvailableSize": 0,
|
|
|
|
"physicalSpaceSize": 0
|
|
|
|
}
|
|
|
|
]
|
|
|
|
},
|
|
|
|
"cost": 1574.14,
|
|
|
|
"afterGC": {
|
|
|
|
"heapStatistics": {
|
|
|
|
"totalHeapSize": 6053888,
|
|
|
|
"totalHeapSizeExecutable": 524288,
|
|
|
|
"totalPhysicalSize": 5500928,
|
|
|
|
"totalAvailableSize": 4341101384,
|
|
|
|
"totalGlobalHandlesSize": 8192,
|
|
|
|
"usedGlobalHandlesSize": 2112,
|
|
|
|
"usedHeapSize": 4059096,
|
|
|
|
"heapSizeLimit": 4345298944,
|
|
|
|
"mallocedMemory": 254128,
|
|
|
|
"externalMemory": 225138,
|
|
|
|
"peakMallocedMemory": 181760
|
|
|
|
},
|
|
|
|
"heapSpaceStatistics": [
|
|
|
|
{
|
|
|
|
"spaceName": "read_only_space",
|
|
|
|
"spaceSize": 0,
|
|
|
|
"spaceUsedSize": 0,
|
|
|
|
"spaceAvailableSize": 0,
|
|
|
|
"physicalSpaceSize": 0
|
|
|
|
}
|
|
|
|
]
|
|
|
|
}
|
|
|
|
}
|
|
|
|
],
|
|
|
|
"endTime": 1674059036865
|
|
|
|
}
|
|
|
|
```
|
|
|
|
|
|
|
|
Here's an example.
|
|
|
|
|
|
|
|
```js
|
|
|
|
const { GCProfiler } = require('v8');
|
|
|
|
const profiler = new GCProfiler();
|
|
|
|
profiler.start();
|
|
|
|
setTimeout(() => {
|
|
|
|
console.log(profiler.stop());
|
|
|
|
}, 1000);
|
|
|
|
```
|
|
|
|
|
2020-09-17 18:53:37 +02:00
|
|
|
[HTML structured clone algorithm]: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm
|
2021-12-22 17:28:39 -08:00
|
|
|
[Hook Callbacks]: #hook-callbacks
|
2020-09-17 18:53:37 +02:00
|
|
|
[V8]: https://developers.google.com/v8/
|
2022-09-08 17:33:20 +08:00
|
|
|
[`--heapsnapshot-near-heap-limit`]: cli.md#--heapsnapshot-near-heap-limitmax_count
|
2021-12-22 17:28:39 -08:00
|
|
|
[`AsyncLocalStorage`]: async_context.md#class-asynclocalstorage
|
2020-09-14 17:09:13 +02:00
|
|
|
[`Buffer`]: buffer.md
|
2021-07-04 20:39:17 -07:00
|
|
|
[`DefaultDeserializer`]: #class-v8defaultdeserializer
|
|
|
|
[`DefaultSerializer`]: #class-v8defaultserializer
|
|
|
|
[`Deserializer`]: #class-v8deserializer
|
2021-10-05 08:50:50 +08:00
|
|
|
[`ERR_BUFFER_TOO_LARGE`]: errors.md#err_buffer_too_large
|
2021-07-04 20:39:17 -07:00
|
|
|
[`Error`]: errors.md#class-error
|
2022-04-29 23:21:41 +08:00
|
|
|
[`GetHeapCodeAndMetadataStatistics`]: https://v8docs.nodesource.com/node-13.2/d5/dda/classv8_1_1_isolate.html#a6079122af17612ef54ef3348ce170866
|
2020-01-08 18:26:25 +05:30
|
|
|
[`GetHeapSpaceStatistics`]: https://v8docs.nodesource.com/node-13.2/d5/dda/classv8_1_1_isolate.html#ac673576f24fdc7a33378f8f57e1d13a4
|
2021-07-04 20:39:17 -07:00
|
|
|
[`NODE_V8_COVERAGE`]: cli.md#node_v8_coveragedir
|
|
|
|
[`Serializer`]: #class-v8serializer
|
2021-12-22 17:28:39 -08:00
|
|
|
[`after` callback]: #afterpromise
|
2021-07-04 17:43:26 -07:00
|
|
|
[`async_hooks`]: async_hooks.md
|
2021-12-22 17:28:39 -08:00
|
|
|
[`before` callback]: #beforepromise
|
2021-10-05 08:50:50 +08:00
|
|
|
[`buffer.constants.MAX_LENGTH`]: buffer.md#bufferconstantsmax_length
|
2021-07-04 20:39:17 -07:00
|
|
|
[`deserializer._readHostObject()`]: #deserializer_readhostobject
|
|
|
|
[`deserializer.transferArrayBuffer()`]: #deserializertransferarraybufferid-arraybuffer
|
2021-12-22 17:28:39 -08:00
|
|
|
[`init` callback]: #initpromise-parent
|
2024-03-02 23:11:30 +01:00
|
|
|
[`queryObjects()` console API]: https://developer.chrome.com/docs/devtools/console/utilities#queryObjects-function
|
2021-07-04 20:39:17 -07:00
|
|
|
[`serialize()`]: #v8serializevalue
|
|
|
|
[`serializer._getSharedArrayBufferId()`]: #serializer_getsharedarraybufferidsharedarraybuffer
|
|
|
|
[`serializer._writeHostObject()`]: #serializer_writehostobjectobject
|
|
|
|
[`serializer.releaseBuffer()`]: #serializerreleasebuffer
|
|
|
|
[`serializer.transferArrayBuffer()`]: #serializertransferarraybufferid-arraybuffer
|
|
|
|
[`serializer.writeRawBytes()`]: #serializerwriterawbytesbuffer
|
2021-12-22 17:28:39 -08:00
|
|
|
[`settled` callback]: #settledpromise
|
2021-07-04 20:39:17 -07:00
|
|
|
[`v8.stopCoverage()`]: #v8stopcoverage
|
|
|
|
[`v8.takeCoverage()`]: #v8takecoverage
|
|
|
|
[`vm.Script`]: vm.md#new-vmscriptcode-options
|
2020-09-14 17:09:13 +02:00
|
|
|
[worker threads]: worker_threads.md
|