feat(pnp): experimental esm support (#2161)

* feat: esm support

* fix: detect module type from any workspace

* fix: always treat cjs as commonjs

* test: add tests

* chore: change loader name

* test: exports

* fix: use legacy resolve if exports is missing

* chore: update config name

* feat: enable loader if any package is a module

* fix: use `findPnpApi` to get the correct `pnpapi` instance

* fix: check if specifier has a pnpapi

* ci: add SvelteKit test

* ci: add Astro e2e test

* fix: pass unknown extensions to the next loader

* fix: don't enter ESM mode if main is cjs

* fix: handle absolute paths to `_findPath`

* chore: let node handle encoding the path to the loader

* fix: get pnpapi of absolute path in `_findPath`

* Update packages/yarnpkg-pnp/sources/esm-loader/loader.ts

Co-authored-by: Maël Nison <nison.mael@gmail.com>

* test: add dynamic import tests

* test: check named exports from a zip file works

* refactor: avoid code generation

* test: skip `dynamic import in cjs` test

* refactor: cleanup

* refactor: rename config and move it to the plugin

* fix: support explicitly disabling ESM support

* chore: print a warning about experimental esm support

* fix: make `isEsmEnabled` private

* chore: versions

* fix: add types for loader artifact

* chore: eslintignore esm loader

* chore: lint after merge

* chore: update versions

* chore: link to the test and upstream issue

* refactor: pass conditions directly to `resolve.exports`

* ci: set config as env variables

* chore: update warning message

* refactor: use `changeFilePromise` to update the loader

* ci: remove Astro e2e test

I've added integration tests that cover the same things

* test: add link to issue

Co-authored-by: Maël Nison <nison.mael@gmail.com>

.eslintignore

@@ -1,4 +1,5 @@
 /packages/yarnpkg-pnp/sources/hook.js
+/packages/yarnpkg-pnp/sources/esm-loader/built-loader.js
 
 /packages/yarnpkg-libzip/sources/libzipAsync.js
 /packages/yarnpkg-libzip/sources/libzipSync.js

.github/workflows/e2e-svelte-kit-workflow.yml

@@ -0,0 +1,36 @@
+on:
+  schedule:
+  - cron: '0 */4 * * *'
+  push:
+    branches:
+    - master
+  pull_request:
+    paths:
+    - .github/workflows/e2e-svelte-kit-workflow.yml
+    - scripts/e2e-setup-ci.sh
+
+name: 'E2E SvelteKit'
+jobs:
+  chore:
+    name: 'Validating SvelteKit'
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@master
+
+    - name: 'Install Node'
+      uses: actions/setup-node@master
+      with:
+        node-version: 14.x
+
+    - name: 'Build the standard bundle'
+      run: |
+        node ./scripts/run-yarn.js build:cli
+
+    - name: 'Running the integration test'
+      run: |
+        source scripts/e2e-setup-ci.sh
+        yes | yarn create svelte@next my-app && cd my-app
+        yarn
+        yarn build
+

.yarn/versions/42ed2c88.yml

@@ -0,0 +1,28 @@
+releases:
+  "@yarnpkg/cli": minor
+  "@yarnpkg/plugin-pnp": minor
+  "@yarnpkg/pnp": minor
+
+declined:
+  - "@yarnpkg/esbuild-plugin-pnp"
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-nm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnpm"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/builder"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"
+  - "@yarnpkg/nm"
+  - "@yarnpkg/pnpify"
+  - "@yarnpkg/sdks"

.yarnrc.yml

@@ -3,6 +3,8 @@ changesetIgnorePatterns:
 
 enableGlobalCache: false
 
+pnpEnableExperimentalEsm: false
+
 immutablePatterns:
   - .pnp.*
 

README.md

@@ -113,6 +113,7 @@ On top of our classic integration tests, we also run Yarn every day against the
 [![](https://github.com/yarnpkg/berry/workflows/E2E%20Gulp/badge.svg?event=schedule)](https://github.com/yarnpkg/berry/blob/master/.github/workflows/e2e-gulp-workflow.yml)<br/>
 [![](https://github.com/yarnpkg/berry/workflows/E2E%20Next/badge.svg?event=schedule)](https://github.com/yarnpkg/berry/blob/master/.github/workflows/e2e-next-workflow.yml)<br/>
 [![](https://github.com/yarnpkg/berry/workflows/E2E%20Preact%20CLI/badge.svg?event=schedule)](https://github.com/yarnpkg/berry/blob/master/.github/workflows/e2e-preact-cli-workflow.yml)<br/>
+[![](https://github.com/yarnpkg/berry/workflows/E2E%20SvelteKit/badge.svg?event=schedule)](https://github.com/yarnpkg/berry/blob/master/.github/workflows/e2e-svelte-kit-workflow.yml)<br/>
 [![](https://github.com/yarnpkg/berry/workflows/E2E%20Vue-CLI/badge.svg?event=schedule)](https://github.com/yarnpkg/berry/blob/master/.github/workflows/e2e-vue-cli-workflow.yml)<br/>
 </td><td valign="top">
 

packages/acceptance-tests/pkg-tests-fixtures/packages/no-deps-bins-esm-1.0.0/index.mjs

@@ -0,0 +1 @@
+console.log(42);

packages/acceptance-tests/pkg-tests-fixtures/packages/no-deps-bins-esm-1.0.0/package.json

@@ -0,0 +1,6 @@
+{
+    "name": "no-deps-bins-esm",
+    "version": "1.0.0",
+    "type": "module",
+    "bin": "./index.mjs"
+}

packages/acceptance-tests/pkg-tests-fixtures/packages/no-deps-exports-1.0.0/index.js

@@ -0,0 +1 @@
+module.exports.foo = 42;

packages/acceptance-tests/pkg-tests-fixtures/packages/no-deps-exports-1.0.0/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "no-deps-exports",
+  "version": "1.0.0"
+}