esm: `--experimental-default-type` flag to flip module defaults #49869

GeoffreyBooth · 2023-09-26T00:53:23Z

This PR contains work by @LiviaMedeiros, @JakobJingleheimer, @bmeck adapted from #49531, #49540, #49295, #41552, #31388.

This PR implements most of the proposal in #49432. It creates a new flag, --experimental-default-type, which supports values commonjs (the default) or module. Under --experimental-default-type=module, Node.js interprets the following as ES modules:

String input provided via --eval or STDIN, if --input-type is unspecified.
Files ending in .js or with no extension, if there is no package.json file present in the same folder or any parent folder.
Files ending in .js or with no extension, if the nearest parent package.json field lacks a type field; unless the folder is inside a node_modules folder.

Extensionless files are interpreted as Wasm if --experimental-wasm-modules is passed and the file contains the “magic bytes” Wasm header.

The ESM loader is used for all entry points, and we don’t pass through Module.runMain. Under this flag, we no longer support monkey-patching of that method by files loaded via --require.

This PR does not implement the “parse the entry point as a URL” part of #49432, as there are still some design decisions to be made around that and it’s substantial enough to warrant being implemented as a separate PR.

This is related to #49629 and linked PRs, which include the above behaviors for extensionless files but don’t require a flag. I think we can potentially ship that change on its own, separate from making this flag the new default behavior, because extensionless files currently error in module scopes. I’d prefer to ship it behind the --experimental-default-type flag first to work out any kinks before splitting it out to not require any flag.

If people don’t mind, I’d like if this PR thread can focus on the implementation. If anyone has any thoughts on the design or intentions behind this, there’s already a detailed thread for that at #49432.

cc @nodejs/loaders @nodejs/wasi @nodejs/startup @nodejs/tsc

Notable change

The new flag --experimental-default-type can be used to flip the default module system used by Node.js. Input that is already explicitly defined as ES modules or CommonJS, such as by a package.json "type" field or .mjs/.cjs file extension or the --input-type flag, is unaffected. What is currently implicitly CommonJS would instead be interpreted as ES modules under --experimental-default-type=module:

String input provided via --eval or STDIN, if --input-type is unspecified.
Files ending in .js or with no extension, if there is no package.json file present in the same folder or any parent folder.
Files ending in .js or with no extension, if the nearest parent package.json field lacks a type field; unless the folder is inside a node_modules folder.

In addition, extensionless files are interpreted as Wasm if --experimental-wasm-modules is passed and the file contains the “magic bytes” Wasm header.

nodejs-github-bot · 2023-09-26T00:53:28Z

Review requested:

@nodejs/loaders

lib/internal/modules/esm/formats.js

lib/internal/modules/esm/get_format.js

guybedford

Thanks @GeoffreyBooth for continuing to push this work, this seems like a step in the right direction to me.

My only suggestion would be considering an alternative flag name like --default-type as an experimental flag or --experimental-default-type so that it is clear from the start that it is not an authoritative flag.

lib/internal/modules/esm/get_format.js

lib/internal/modules/esm/formats.js

lib/internal/modules/run_main.js

src/node_options.h

lib/internal/modules/esm/formats.js

doc/api/cli.md

lib/internal/modules/esm/formats.js

lib/internal/main/check_syntax.js

lib/internal/main/eval_stdin.js

lib/internal/main/eval_string.js

test/fixtures/es-modules/package-type-module/wasm-dep.mjs

lib/internal/modules/esm/get_format.js

guybedford

Marking for approval conditional on resolving the naming discussion.

lib/internal/modules/run_main.js

`test-wasm-web-api` was moved from `test/parallel` to `test/es-modules`. Update the status files for parallel and es-modules accordingly. Refs: nodejs#49869 Refs: nodejs#47299 Refs: nodejs#47297 PR-URL: nodejs#49958 Reviewed-By: Joyee Cheung <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: Moshe Atlow <[email protected]>

Notable Changes: doc: * promote fetch/webstreams from experimental to stable (Steven) nodejs#45684 esm: * use import attributes instead of import assertions (Antoine du Hamel) nodejs#50140 * --experimental-default-type flag to flip module defaults (Geoffrey Booth) nodejs#49869 * remove `globalPreload` hook (superseded by `initialize`) (Jacob Smith) nodejs#49144 fs: * add flush option to writeFile() functions (Colin Ihrig) nodejs#50009 * (SEMVER-MAJOR) add globSync implementation (Moshe Atlow) nodejs#47653 http: * (SEMVER-MAJOR) reduce parts in chunked response when corking (Robert Nagy) nodejs#50167 lib: * (SEMVER-MINOR) add WebSocket client (Matthew Aitken) nodejs#49830 * (SEMVER-MAJOR) add `navigator.hardwareConcurrency` (Yagiz Nizipli) nodejs#47769 stream: * optimize Writable (Robert Nagy) nodejs#50012 test_runner: * (SEMVER-MAJOR) support passing globs (Moshe Atlow) nodejs#47653 vm: * use default HDO when importModuleDynamically is not set (Joyee Cheung) nodejs#49950 Semver-Major Commits: * (SEMVER-MAJOR) build: drop support for Visual Studio 2019 (Michaël Zasso) nodejs#49051 * (SEMVER-MAJOR) build: bump supported macOS and Xcode versions (Michaël Zasso) nodejs#49164 * (SEMVER-MAJOR) crypto: do not overwrite \_writableState.defaultEncoding (Tobias Nießen) nodejs#49140 * (SEMVER-MAJOR) deps: bump minimum ICU version to 73 (Michaël Zasso) nodejs#49639 * (SEMVER-MAJOR) deps: update V8 to 11.8.172.13 (Michaël Zasso) nodejs#49639 * (SEMVER-MAJOR) deps: update llhttp to 9.1.2 (Paolo Insogna) nodejs#48981 * (SEMVER-MAJOR) events: validate options of `on` and `once` (Deokjin Kim) nodejs#46018 * (SEMVER-MAJOR) fs: adjust `position` validation in reading methods (Livia Medeiros) nodejs#42835 * (SEMVER-MAJOR) fs: add globSync implementation (Moshe Atlow) nodejs#47653 * (SEMVER-MAJOR) http: reduce parts in chunked response when corking (Robert Nagy) nodejs#50167 * (SEMVER-MAJOR) lib: mark URL/URLSearchParams as uncloneable and untransferable (Chengzhong Wu) nodejs#47497 * (SEMVER-MAJOR) lib: remove aix directory case for package reader (Yagiz Nizipli) nodejs#48605 * (SEMVER-MAJOR) lib: add `navigator.hardwareConcurrency` (Yagiz Nizipli) nodejs#47769 * (SEMVER-MAJOR) lib: runtime deprecate punycode (Yagiz Nizipli) nodejs#47202 * (SEMVER-MAJOR) module: harmonize error code between ESM and CJS (Antoine du Hamel) nodejs#48606 * (SEMVER-MAJOR) net: do not treat `server.maxConnections=0` as `Infinity` (ignoramous) nodejs#48276 * (SEMVER-MAJOR) net: only defer \_final call when connecting (Jason Zhang) nodejs#47385 * (SEMVER-MAJOR) node-api: rename internal NAPI\_VERSION definition (Chengzhong Wu) nodejs#48501 * (SEMVER-MAJOR) src: update NODE\_MODULE\_VERSION to 120 (Michaël Zasso) nodejs#49639 * (SEMVER-MAJOR) src: throw DOMException on cloning non-serializable objects (Chengzhong Wu) nodejs#47839 * (SEMVER-MAJOR) src: throw DataCloneError on transfering untransferable objects (Chengzhong Wu) nodejs#47604 * (SEMVER-MAJOR) stream: use private properties for strategies (Yagiz Nizipli) nodejs#47218 * (SEMVER-MAJOR) stream: use private properties for encoding (Yagiz Nizipli) nodejs#47218 * (SEMVER-MAJOR) stream: use private properties for compression (Yagiz Nizipli) nodejs#47218 * (SEMVER-MAJOR) test\_runner: disallow array in `run` options (Raz Luvaton) nodejs#49935 * (SEMVER-MAJOR) test\_runner: support passing globs (Moshe Atlow) nodejs#47653 * (SEMVER-MAJOR) tls: use `validateNumber` for `options.minDHSize` (Deokjin Kim) nodejs#49973 * (SEMVER-MAJOR) tls: use validateFunction for `options.checkServerIdentity` (Deokjin Kim) nodejs#49896 * (SEMVER-MAJOR) util: runtime deprecate `promisify`-ing a function returning a `Promise` (Antoine du Hamel) nodejs#49609 * (SEMVER-MAJOR) vm: freeze `dependencySpecifiers` array (Antoine du Hamel) nodejs#49720 PR-URL: nodejs#49870 Co-authored-by: Michaël Zasso <[email protected]>

PR-URL: nodejs#49869 Reviewed-By: Guy Bedford <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]>

PR-URL: #49869 Reviewed-By: Guy Bedford <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]>

`test-wasm-web-api` was moved from `test/parallel` to `test/es-modules`. Update the status files for parallel and es-modules accordingly. Refs: #49869 Refs: #47299 Refs: #47297 PR-URL: #49958 Reviewed-By: Joyee Cheung <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: Moshe Atlow <[email protected]>

PR-URL: nodejs#49869 Reviewed-By: Guy Bedford <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]>

Notable changes: deps: * (SEMVER-MINOR) update uvwasi to 0.0.19 (Node.js GitHub Bot) #49908 doc: * add H4ad to collaborators (Vinícius Lourenço) #50217 esm: * (SEMVER-MINOR) detect ESM syntax in ambiguous JavaScript (Geoffrey Booth) #50096 * use import attributes instead of import assertions (Antoine du Hamel) #50140 * --experimental-default-type flag to flip module defaults (Geoffrey Booth) #49869 fs: * (SEMVER-MINOR) add flush option to appendFile() functions (Colin Ihrig) #50095 * add flush option to writeFile() functions (Colin Ihrig) #50009 lib: * (SEMVER-MINOR) add WebSocket client (Matthew Aitken) #49830 stream: * (SEMVER-MINOR) allow pass stream class to `stream.compose` (Alex Yang) #50187 * call helper function from push and unshift (Raz Luvaton) #50173 * optimize Writable (Robert Nagy) #50012 test_runner, cli: * (SEMVER-MINOR) add --test-concurrency flag (Colin Ihrig) #49996 vm: * (SEMVER-MINOR) use import attributes instead of import assertions (Antoine du Hamel) #50141 * use default HDO when importModuleDynamically is not set (Joyee Cheung) #49950 wasi: PR-URL: #50682

PR-URL: #49869 Backport-PR-URL: #50669 Reviewed-By: Guy Bedford <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]>

Notable changes: deps: * (SEMVER-MINOR) update uvwasi to 0.0.19 (Node.js GitHub Bot) nodejs#49908 doc: * add H4ad to collaborators (Vinícius Lourenço) nodejs#50217 esm: * (SEMVER-MINOR) detect ESM syntax in ambiguous JavaScript (Geoffrey Booth) nodejs#50096 * use import attributes instead of import assertions (Antoine du Hamel) nodejs#50140 * --experimental-default-type flag to flip module defaults (Geoffrey Booth) nodejs#49869 fs: * (SEMVER-MINOR) add flush option to appendFile() functions (Colin Ihrig) nodejs#50095 * add flush option to writeFile() functions (Colin Ihrig) nodejs#50009 lib: * (SEMVER-MINOR) add WebSocket client (Matthew Aitken) nodejs#49830 stream: * (SEMVER-MINOR) allow pass stream class to `stream.compose` (Alex Yang) nodejs#50187 * call helper function from push and unshift (Raz Luvaton) nodejs#50173 * optimize Writable (Robert Nagy) nodejs#50012 test_runner, cli: * (SEMVER-MINOR) add --test-concurrency flag (Colin Ihrig) nodejs#49996 vm: * (SEMVER-MINOR) use import attributes instead of import assertions (Antoine du Hamel) nodejs#50141 * use default HDO when importModuleDynamically is not set (Joyee Cheung) nodejs#49950 wasi: PR-URL: nodejs#50682

Notable changes: deps: * (SEMVER-MINOR) update uvwasi to 0.0.19 (Node.js GitHub Bot) #49908 * (SEMVER-MINOR) upgrade npm to 10.0.0 (npm team) #49423 doc: * add new TSC members (Michael Dawson) #48841 * move and rename loaders section (Geoffrey Booth) #49261 esm: * use import attributes instead of import assertions (Antoine du Hamel) #50140 * --experimental-default-type flag to flip module defaults (Geoffrey Booth) #49869 * unflag import.meta.resolve (Guy Bedford) #49028 * move hook execution to separate thread (Jacob Smith) #44710 * leverage loaders when resolving subsequent loaders (Maël Nison) #43772 lib: * (SEMVER-MINOR) add api to detect whether source-maps are enabled (翠 / green) #46391 * (SEMVER-MINOR) add tracing channel to diagnostics_channel (Stephen Belanger) #44943 src: * (SEMVER-MINOR) add cjs_module_lexer_version base64_version (Jithil P Ponnan) #45629 stream: * use bitmap in readable state (Benjamin Gruenbaum) #49745 test_runner: * (SEMVER-MINOR) accept `testOnly` in `run` (Moshe Atlow) #49753 * (SEMVER-MINOR) add junit reporter (Moshe Atlow) #49614 * (SEMVER-MINOR) expose location of tests (Colin Ihrig) #48975 * (SEMVER-MINOR) add shards support (Raz Luvaton) #48639 * (SEMVER-MINOR) add initial draft for fakeTimers (Erick Wendel) #47775 test_runner, cli: * (SEMVER-MINOR) add --test-concurrency flag (Colin Ihrig) #49996 tls: * (SEMVER-MINOR) add ALPNCallback server option for dynamic ALPN negotiation (Tim Perry) #45190 vm: * (SEMVER-MINOR) use import attributes instead of import assertions (Antoine du Hamel) #50141 wasi: * (SEMVER-MINOR) updates required for latest uvwasi version (Michael Dawson) #49908 PR-URL: TODO

Notable changes: deps: * (SEMVER-MINOR) update uvwasi to 0.0.19 (Node.js GitHub Bot) #49908 * (SEMVER-MINOR) upgrade npm to 10.2.3 (npm team) #50531 doc: * move and rename loaders section (Geoffrey Booth) #49261 esm: * use import attributes instead of import assertions (Antoine du Hamel) #50140 * --experimental-default-type flag to flip module defaults (Geoffrey Booth) #49869 * unflag import.meta.resolve (Guy Bedford) #49028 * move hook execution to separate thread (Jacob Smith) #44710 * leverage loaders when resolving subsequent loaders (Maël Nison) #43772 lib: * (SEMVER-MINOR) add api to detect whether source-maps are enabled (翠 / green) #46391 * (SEMVER-MINOR) add tracing channel to diagnostics_channel (Stephen Belanger) #44943 src: * (SEMVER-MINOR) add cjs_module_lexer_version base64_version (Jithil P Ponnan) #45629 stream: * use bitmap in readable state (Benjamin Gruenbaum) #49745 test_runner: * (SEMVER-MINOR) accept `testOnly` in `run` (Moshe Atlow) #49753 * (SEMVER-MINOR) add junit reporter (Moshe Atlow) #49614 * (SEMVER-MINOR) expose location of tests (Colin Ihrig) #48975 * (SEMVER-MINOR) add shards support (Raz Luvaton) #48639 * (SEMVER-MINOR) add initial draft for fakeTimers (Erick Wendel) #47775 test_runner, cli: * (SEMVER-MINOR) add --test-concurrency flag (Colin Ihrig) #49996 tls: * (SEMVER-MINOR) add ALPNCallback server option for dynamic ALPN negotiation (Tim Perry) #45190 vm: * (SEMVER-MINOR) use import attributes instead of import assertions (Antoine du Hamel) #50141 PR-URL: #50953

**What's the problem this PR addresses?** Node.js v18.19 has been released and contains nodejs/node#49869 so we need to update tests. **How did you fix it?** Updated the version range. **Checklist** - [x] I have read the [Contributing Guide](https://yarnpkg.com/advanced/contributing). - [x] I have set the packages that need to be released for my changes to be effective. - [x] I will check that all automated PR checks pass before the PR gets reviewed.

**What's the problem this PR addresses?** Node.js v18.19 has been released and contains nodejs/node#49869 so we need to update tests. **How did you fix it?** Updated the version range. **Checklist** - [x] I have read the [Contributing Guide](https://yarnpkg.com/advanced/contributing). - [x] I have set the packages that need to be released for my changes to be effective. - [x] I will check that all automated PR checks pass before the PR gets reviewed. (cherry picked from commit 6ca73db)

PR-URL: nodejs#49869 Reviewed-By: Guy Bedford <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]>

`test-wasm-web-api` was moved from `test/parallel` to `test/es-modules`. Update the status files for parallel and es-modules accordingly. Refs: nodejs#49869 Refs: nodejs#47299 Refs: nodejs#47297 PR-URL: nodejs#49958 Reviewed-By: Joyee Cheung <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: Moshe Atlow <[email protected]>

PR-URL: nodejs/node#49869 Backport-PR-URL: nodejs/node#50669 Reviewed-By: Guy Bedford <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]>

Notable changes: deps: * (SEMVER-MINOR) update uvwasi to 0.0.19 (Node.js GitHub Bot) nodejs/node#49908 * (SEMVER-MINOR) upgrade npm to 10.2.3 (npm team) nodejs/node#50531 doc: * move and rename loaders section (Geoffrey Booth) nodejs/node#49261 esm: * use import attributes instead of import assertions (Antoine du Hamel) nodejs/node#50140 * --experimental-default-type flag to flip module defaults (Geoffrey Booth) nodejs/node#49869 * unflag import.meta.resolve (Guy Bedford) nodejs/node#49028 * move hook execution to separate thread (Jacob Smith) nodejs/node#44710 * leverage loaders when resolving subsequent loaders (Maël Nison) nodejs/node#43772 lib: * (SEMVER-MINOR) add api to detect whether source-maps are enabled (翠 / green) nodejs/node#46391 * (SEMVER-MINOR) add tracing channel to diagnostics_channel (Stephen Belanger) nodejs/node#44943 src: * (SEMVER-MINOR) add cjs_module_lexer_version base64_version (Jithil P Ponnan) nodejs/node#45629 stream: * use bitmap in readable state (Benjamin Gruenbaum) nodejs/node#49745 test_runner: * (SEMVER-MINOR) accept `testOnly` in `run` (Moshe Atlow) nodejs/node#49753 * (SEMVER-MINOR) add junit reporter (Moshe Atlow) nodejs/node#49614 * (SEMVER-MINOR) expose location of tests (Colin Ihrig) nodejs/node#48975 * (SEMVER-MINOR) add shards support (Raz Luvaton) nodejs/node#48639 * (SEMVER-MINOR) add initial draft for fakeTimers (Erick Wendel) nodejs/node#47775 test_runner, cli: * (SEMVER-MINOR) add --test-concurrency flag (Colin Ihrig) nodejs/node#49996 tls: * (SEMVER-MINOR) add ALPNCallback server option for dynamic ALPN negotiation (Tim Perry) nodejs/node#45190 vm: * (SEMVER-MINOR) use import attributes instead of import assertions (Antoine du Hamel) nodejs/node#50141 PR-URL: nodejs/node#50953

PR-URL: nodejs/node#49869 Backport-PR-URL: nodejs/node#50669 Reviewed-By: Guy Bedford <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]>

Notable changes: deps: * (SEMVER-MINOR) update uvwasi to 0.0.19 (Node.js GitHub Bot) nodejs/node#49908 * (SEMVER-MINOR) upgrade npm to 10.2.3 (npm team) nodejs/node#50531 doc: * move and rename loaders section (Geoffrey Booth) nodejs/node#49261 esm: * use import attributes instead of import assertions (Antoine du Hamel) nodejs/node#50140 * --experimental-default-type flag to flip module defaults (Geoffrey Booth) nodejs/node#49869 * unflag import.meta.resolve (Guy Bedford) nodejs/node#49028 * move hook execution to separate thread (Jacob Smith) nodejs/node#44710 * leverage loaders when resolving subsequent loaders (Maël Nison) nodejs/node#43772 lib: * (SEMVER-MINOR) add api to detect whether source-maps are enabled (翠 / green) nodejs/node#46391 * (SEMVER-MINOR) add tracing channel to diagnostics_channel (Stephen Belanger) nodejs/node#44943 src: * (SEMVER-MINOR) add cjs_module_lexer_version base64_version (Jithil P Ponnan) nodejs/node#45629 stream: * use bitmap in readable state (Benjamin Gruenbaum) nodejs/node#49745 test_runner: * (SEMVER-MINOR) accept `testOnly` in `run` (Moshe Atlow) nodejs/node#49753 * (SEMVER-MINOR) add junit reporter (Moshe Atlow) nodejs/node#49614 * (SEMVER-MINOR) expose location of tests (Colin Ihrig) nodejs/node#48975 * (SEMVER-MINOR) add shards support (Raz Luvaton) nodejs/node#48639 * (SEMVER-MINOR) add initial draft for fakeTimers (Erick Wendel) nodejs/node#47775 test_runner, cli: * (SEMVER-MINOR) add --test-concurrency flag (Colin Ihrig) nodejs/node#49996 tls: * (SEMVER-MINOR) add ALPNCallback server option for dynamic ALPN negotiation (Tim Perry) nodejs/node#45190 vm: * (SEMVER-MINOR) use import attributes instead of import assertions (Antoine du Hamel) nodejs/node#50141 PR-URL: nodejs/node#50953

GeoffreyBooth added module Issues and PRs related to the module subsystem. cli Issues and PRs related to the Node.js command line interface. esm Issues and PRs related to the ECMAScript Modules implementation. labels Sep 26, 2023

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Discussion: Name of the flag for the “ESM by default” mode #49541

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Add "type" to package.json MoLow/reporters#102

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Node.js Technical Steering Committee (TSC) Meeting 2023-09-27 nodejs/TSC#1442

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tools: support updating @reporters/github manually #49871

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[v18.x] Backport most ESM and customization hook changes #50669

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v20.10.0 release proposal #50682

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2023-12-06, N|Solid v5.0.1 Iron Release nodesource/nsolid#41

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esm: `--experimental-default-type` flag to flip module defaults #49869

esm: `--experimental-default-type` flag to flip module defaults #49869

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esm: `--experimental-default-type` flag to flip module defaults #49869

esm: `--experimental-default-type` flag to flip module defaults #49869

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