--es-module-specifier-resolution flag by MylesBorins · Pull Request #48 · nodejs/ecmascript-modules

MylesBorins · 2019-03-05T09:44:32Z

This is a super naive copy / paste of the resolution algorithm from upstream, slightly tweaked to work with the internals of the new loader. There is some duplication here, but I've kept it to a minimum.

@ljharb the flag right now is a boolean flag... either the flag is included or isn't. Happy to work on something better, e.g. a no-op flag for other mode or different input type for this flag... but this was enough to get things stared

If anyone wants to make changes to this please feel free to push to the branch. Hopefully this gets us 90% of the way there

thysultan · 2019-03-05T10:10:07Z

What does legacy_resolution entail?

For example if you have the following node_module pkg structure:

pkg/
server/
index.js
package.json
package.json
index.js

Assuming both package.json in pkg and pkg/server point to their respective index.js, would the following:

import{h}from'pkg'import{render}from'pkg/server'

Under legacy_resolution still resolve index.js through package.json.

That is can you still archive "pretty paths" like pkg/server instead of pkg/server/index.js by using package.json, or is all of this unrelated to this.

guybedford · 2019-03-05T10:50:54Z

I've rebased this to the CI fixes branch, and also added an adjustment to ensure the legacy resolution applies to package subpath resolution paths as well.

devsnek · 2019-03-05T14:07:35Z

@MylesBorins just for the sake of avoiding confusion, can this be named --searching-resolution or something? "legacy" already refers to a bunch of behaviour in the cjs loader that the one you copied here doesn't have.

ljharb · 2019-03-05T17:36:13Z

Also “legacy” implies it’s legacy, which at the moment it is certainly not, and we have no consensus that it will be. Please rename.

Re a boolean flag; that’s fine if it follows the convention that --no-x sets x to false, while -x sets it to true.

MylesBorins · 2019-03-06T07:47:42Z

Updated based on all notes and added extensive tests PTAL

MylesBorins · 2019-03-06T20:49:58Z

 assert.strictEqual(success, 'success');
 assert.strictEqual(explicit, 'esm');
-assert.strictEqual(implicit, 'cjs');
+assert.strictEqual(implicit, 'esm');


So with this change, from the prior loader, .mjs would be resolved before .js? would .cjs resolve before .mjs?

Looks good to me, as long as if dual-mode is possible we leave it undocumented.

MylesBorins · 2019-03-08T23:08:29Z

This has been open for 4 days and there are no more objections. If CI is green I plan to land this.

CI: https://ci.nodejs.org/job/node-test-pull-request/21362/

There are currently two supported values "none" and "node"

MylesBorins · 2019-03-09T06:30:04Z

landed in bec588f

@sapegin

BUGFIXES * [`27cccfbda`](npm/cli@27cccfb) [#223](npm/cli#223) vulns → vulnerabilities in npm audit output ([@sapegin](https://github.com/sapegin)) * [`d5e865eb7`](npm/cli@d5e865e) [#222](npm/cli#222) [#226](npm/cli#226) install, doctor: don't crash if registry unset ([@dmitrydvorkin](https://github.com/dmitrydvorkin), [@isaacs](https://github.com/isaacs)) * [`5b3890226`](npm/cli@5b38902) [#227](npm/cli#227) [npm.community#9167](https://npm.community/t/npm-err-cb-never-called-permission-denied/9167/5) Handle unhandledRejections, tell user what to do when encountering an `EACCES` error in the cache. ([@isaacs](https://github.com/isaacs)) DEPENDENCIES * [`77516df6e`](npm/cli@77516df) `licensee@7.0.3` ([@isaacs](https://github.com/isaacs)) * [`ceb993590`](npm/cli@ceb9935) `query-string@6.8.2` ([@isaacs](https://github.com/isaacs)) * [`4050b9189`](npm/cli@4050b91) `hosted-git-info@2.8.2` * [#46](npm/hosted-git-info#46) [#43](npm/hosted-git-info#43) [#47](npm/hosted-git-info#47) [#44](npm/hosted-git-info#44) Add support for GitLab subgroups ([@mterrel](https://github.com/mterrel), [@isaacs](https://github.com/isaacs), [@ybiquitous](https://github.com/ybiquitous)) * [`3b1d629`](npm/hosted-git-info@3b1d629) [#48](npm/hosted-git-info#48) fix http protocol using sshurl by default ([@fengmk2](https://github.com/fengmk2)) * [`5d4a8d7`](npm/hosted-git-info@5d4a8d7) ignore noCommittish on tarball url generation ([@isaacs](https://github.com/isaacs)) * [`1692435`](npm/hosted-git-info@1692435) use gist tarball url that works for anonymous gists ([@isaacs](https://github.com/isaacs)) * [`d5cf830`](npm/hosted-git-info@d5cf830) Do not allow invalid gist urls ([@isaacs](https://github.com/isaacs)) * [`e518222`](npm/hosted-git-info@e518222) Use LRU cache to prevent unbounded memory consumption ([@iarna](https://github.com/iarna)) PR-URL: nodejs/node#29023 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>

MylesBorins changed the title ~~[WIP] Legacy Resolution Falg~~[WIP] Legacy Resolution FlagMar 5, 2019

MylesBorins force-pushed the resolution-flag branch from f94cc2c to b36bf08Compare March 5, 2019 09:48

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Steps required to upstream implementation nodejs/modules#286
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MylesBorins changed the title ~~[WIP] Legacy Resolution Flag~~[WIP] --esm-extension-resolution flagMar 5, 2019

MylesBorins force-pushed the resolution-flag branch from 2de50e3 to d6a3b09Compare March 5, 2019 19:49

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MylesBorins changed the title ~~[WIP] --esm-extension-resolution flag~~[WIP] --esm-filename-resolution flagMar 5, 2019

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MylesBorins changed the title ~~[WIP] --esm-filename-resolution flag~~[WIP] --es-module-specifier-resolution flagMar 6, 2019

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MylesBorinsand others added 6 commits March 8, 2019 19:53

esm: add --es-module-specifier-resolution
fe296bf
There are currently two supported values "none" and "node"

fixup: missing tests
ae8566b

fixup: change default mode name
4831b2a

simplify package main resolve
dde193c

implicit specifier case is esm
1db6060

fixup: doc lint issues
1cb5cea

MylesBorins force-pushed the resolution-flag branch from a7b4b27 to 1cb5ceaCompare March 9, 2019 01:41

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ljharb deleted the resolution-flag branch March 9, 2019 06:41

GeoffreyBooth changed the title ~~[WIP] --es-module-specifier-resolution flag~~--es-module-specifier-resolution flagMar 13, 2019

GeoffreyBooth mentioned this pull request Mar 13, 2019
File extension/directory index resolution in ESM nodejs/modules#268
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