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doc: update notable changes in v21.1.0 #50388

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Oct 26, 2023
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doc: update notable changes in v21.1.0 #50388

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doc: update notable changes in v21.1.0
joyeecheung Oct 25, 2023
8c1309b
fixup! doc: update notable changes in v21.1.0
joyeecheung Oct 25, 2023
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19 changes: 16 additions & 3 deletions doc/changelogs/CHANGELOG_V21.md
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Expand Up @@ -60,16 +60,29 @@ such as `.mjs` or `.cjs`, will opt out of detection.

Contributed by Geoffrey Booth in [#50096](https://github.com/nodejs/node/pull/50096).

### vm: fix V8 compilation cache support for vm.Script

Previously repeated compilation of the same source code using `vm.Script`
stopped hitting the V8 compilation cache after v16.x when support for
`importModuleDynamically` was added to `vm.Script`, resulting in a performance
regression that blocked users (in particular Jest users) from upgrading from
v16.x.

The recent fixes landed in v21.1.0 allow the compilation cache to be hit again
for `vm.Script` when `--experimental-vm-modules` is not used even in the
presence of the `importModuleDynamically` option, so that users affected by the
performance regression can now upgrade. Ongoing work is also being done to
enable compilation cache support for `vm.CompileFunction`.

Contributed by Joyee Cheung in [#50137](https://github.com/nodejs/node/pull/50137).

#### Other Notable Changes

* \[[`3729e33358`](https://github.com/nodejs/node/commit/3729e33358)] - **doc**: add H4ad to collaborators (Vinícius Lourenço) [#50217](https://github.com/nodejs/node/pull/50217)
* \[[`18862e4d5d`](https://github.com/nodejs/node/commit/18862e4d5d)] - **(SEMVER-MINOR)** **fs**: add `flush` option to `appendFile()` functions (Colin Ihrig) [#50095](https://github.com/nodejs/node/pull/50095)
* \[[`5a52c518ef`](https://github.com/nodejs/node/commit/5a52c518ef)] - **(SEMVER-MINOR)** **lib**: add `navigator.userAgent` (Yagiz Nizipli) [#50200](https://github.com/nodejs/node/pull/50200)
* \[[`789372a072`](https://github.com/nodejs/node/commit/789372a072)] - **(SEMVER-MINOR)** **stream**: allow pass stream class to `stream.compose` (Alex Yang) [#50187](https://github.com/nodejs/node/pull/50187)
* \[[`f3a9ea0bc4`](https://github.com/nodejs/node/commit/f3a9ea0bc4)] - **stream**: improve performance of readable stream reads (Raz Luvaton) [#50173](https://github.com/nodejs/node/pull/50173)
* \[[`dda33c2bf1`](https://github.com/nodejs/node/commit/dda33c2bf1)] - **vm**: reject in importModuleDynamically without --experimental-vm-modules (Joyee Cheung) [#50137](https://github.com/nodejs/node/pull/50137)
* \[[`3999362c59`](https://github.com/nodejs/node/commit/3999362c59)] - **vm**: use internal versions of compileFunction and Script (Joyee Cheung) [#50137](https://github.com/nodejs/node/pull/50137)
* \[[`a54179f0e0`](https://github.com/nodejs/node/commit/a54179f0e0)] - **vm**: unify host-defined option generation in vm.compileFunction (Joyee Cheung) [#50137](https://github.com/nodejs/node/pull/50137)

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