Migrates to Eslint's flat config (#6276)

## What's the problem this PR addresses?

This lets us remove the Rushstack fix, and dogfood the VSCode SDK with
the flat config (which is the only available config in Eslint 9). I
would have migrated us to Eslint 9, but eslint-plugin-react [isn't
compatible
yet](jsx-eslint/eslint-plugin-react#3699).

## How did you fix it?

Migrate to eslint.config.mjs.

## Checklist

<!--- Don't worry if you miss something, chores are automatically
tested. -->
<!--- This checklist exists to help you remember doing the chores when
you submit a PR. -->
<!--- Put an `x` in all the boxes that apply. -->
- [x] I have read the [Contributing
Guide](https://yarnpkg.com/advanced/contributing).

<!-- See
https://yarnpkg.com/advanced/contributing#preparing-your-pr-to-be-released
for more details. -->
<!-- Check with `yarn version check` and fix with `yarn version check
-i` -->
- [x] I have set the packages that need to be released for my changes to
be effective.

<!-- The "Testing chores" workflow validates that your PR follows our
guidelines. -->
<!-- If it doesn't pass, click on it to see details as to what your PR
might be missing. -->
- [x] I will check that all automated PR checks pass before the PR gets
reviewed.

.vscode/settings.json

@@ -7,6 +7,7 @@
     "watchDirectory": "useFsEvents"
   },
   "npm.packageManager": "yarn",
+  "eslint.experimental.useFlatConfig": true,
   "eslint.validate": [
     "javascript",
     "typescript",

.yarn/sdks/eslint/bin/eslint.js

@@ -1,18 +1,25 @@
 #!/usr/bin/env node
 
 const {existsSync} = require(`fs`);
-const {createRequire} = require(`module`);
+const {createRequire, register} = require(`module`);
 const {resolve} = require(`path`);
+const {pathToFileURL} = require(`url`);
 
 const relPnpApiPath = "../../../../.pnp.cjs";
 
 const absPnpApiPath = resolve(__dirname, relPnpApiPath);
 const absRequire = createRequire(absPnpApiPath);
 
+const absPnpLoaderPath = resolve(absPnpApiPath, `../.pnp.loader.mjs`);
+const isPnpLoaderEnabled = existsSync(absPnpLoaderPath);
+
 if (existsSync(absPnpApiPath)) {
   if (!process.versions.pnp) {
     // Setup the environment to be able to require eslint/bin/eslint.js
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/sdks/eslint/lib/api.js

@@ -1,18 +1,25 @@
 #!/usr/bin/env node
 
 const {existsSync} = require(`fs`);
-const {createRequire} = require(`module`);
+const {createRequire, register} = require(`module`);
 const {resolve} = require(`path`);
+const {pathToFileURL} = require(`url`);
 
 const relPnpApiPath = "../../../../.pnp.cjs";
 
 const absPnpApiPath = resolve(__dirname, relPnpApiPath);
 const absRequire = createRequire(absPnpApiPath);
 
+const absPnpLoaderPath = resolve(absPnpApiPath, `../.pnp.loader.mjs`);
+const isPnpLoaderEnabled = existsSync(absPnpLoaderPath);
+
 if (existsSync(absPnpApiPath)) {
   if (!process.versions.pnp) {
     // Setup the environment to be able to require eslint
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/sdks/eslint/lib/unsupported-api.js

@@ -1,18 +1,25 @@
 #!/usr/bin/env node
 
 const {existsSync} = require(`fs`);
-const {createRequire} = require(`module`);
+const {createRequire, register} = require(`module`);
 const {resolve} = require(`path`);
+const {pathToFileURL} = require(`url`);
 
 const relPnpApiPath = "../../../../.pnp.cjs";
 
 const absPnpApiPath = resolve(__dirname, relPnpApiPath);
 const absRequire = createRequire(absPnpApiPath);
 
+const absPnpLoaderPath = resolve(absPnpApiPath, `../.pnp.loader.mjs`);
+const isPnpLoaderEnabled = existsSync(absPnpLoaderPath);
+
 if (existsSync(absPnpApiPath)) {
   if (!process.versions.pnp) {
     // Setup the environment to be able to require eslint/use-at-your-own-risk
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/sdks/eslint/package.json

@@ -1,6 +1,6 @@
 {
   "name": "eslint",
-  "version": "8.45.0-sdk",
+  "version": "8.57.0-sdk",
   "main": "./lib/api.js",
   "type": "commonjs",
   "bin": {

.yarn/sdks/typescript/bin/tsc

@@ -1,18 +1,25 @@
 #!/usr/bin/env node
 
 const {existsSync} = require(`fs`);
-const {createRequire} = require(`module`);
+const {createRequire, register} = require(`module`);
 const {resolve} = require(`path`);
+const {pathToFileURL} = require(`url`);
 
 const relPnpApiPath = "../../../../.pnp.cjs";
 
 const absPnpApiPath = resolve(__dirname, relPnpApiPath);
 const absRequire = createRequire(absPnpApiPath);
 
+const absPnpLoaderPath = resolve(absPnpApiPath, `../.pnp.loader.mjs`);
+const isPnpLoaderEnabled = existsSync(absPnpLoaderPath);
+
 if (existsSync(absPnpApiPath)) {
   if (!process.versions.pnp) {
     // Setup the environment to be able to require typescript/bin/tsc
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/sdks/typescript/bin/tsserver

@@ -1,18 +1,25 @@
 #!/usr/bin/env node
 
 const {existsSync} = require(`fs`);
-const {createRequire} = require(`module`);
+const {createRequire, register} = require(`module`);
 const {resolve} = require(`path`);
+const {pathToFileURL} = require(`url`);
 
 const relPnpApiPath = "../../../../.pnp.cjs";
 
 const absPnpApiPath = resolve(__dirname, relPnpApiPath);
 const absRequire = createRequire(absPnpApiPath);
 
+const absPnpLoaderPath = resolve(absPnpApiPath, `../.pnp.loader.mjs`);
+const isPnpLoaderEnabled = existsSync(absPnpLoaderPath);
+
 if (existsSync(absPnpApiPath)) {
   if (!process.versions.pnp) {
     // Setup the environment to be able to require typescript/bin/tsserver
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/sdks/typescript/lib/tsc.js

@@ -1,18 +1,25 @@
 #!/usr/bin/env node
 
 const {existsSync} = require(`fs`);
-const {createRequire} = require(`module`);
+const {createRequire, register} = require(`module`);
 const {resolve} = require(`path`);
+const {pathToFileURL} = require(`url`);
 
 const relPnpApiPath = "../../../../.pnp.cjs";
 
 const absPnpApiPath = resolve(__dirname, relPnpApiPath);
 const absRequire = createRequire(absPnpApiPath);
 
+const absPnpLoaderPath = resolve(absPnpApiPath, `../.pnp.loader.mjs`);
+const isPnpLoaderEnabled = existsSync(absPnpLoaderPath);
+
 if (existsSync(absPnpApiPath)) {
   if (!process.versions.pnp) {
     // Setup the environment to be able to require typescript/lib/tsc.js
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/sdks/typescript/lib/tsserver.js

@@ -1,18 +1,25 @@
 #!/usr/bin/env node
 
 const {existsSync} = require(`fs`);
-const {createRequire} = require(`module`);
+const {createRequire, register} = require(`module`);
 const {resolve} = require(`path`);
+const {pathToFileURL} = require(`url`);
 
 const relPnpApiPath = "../../../../.pnp.cjs";
 
 const absPnpApiPath = resolve(__dirname, relPnpApiPath);
 const absRequire = createRequire(absPnpApiPath);
 
+const absPnpLoaderPath = resolve(absPnpApiPath, `../.pnp.loader.mjs`);
+const isPnpLoaderEnabled = existsSync(absPnpLoaderPath);
+
 if (existsSync(absPnpApiPath)) {
   if (!process.versions.pnp) {
     // Setup the environment to be able to require typescript/lib/tsserver.js
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/sdks/typescript/lib/tsserverlibrary.js

@@ -1,18 +1,25 @@
 #!/usr/bin/env node
 
 const {existsSync} = require(`fs`);
-const {createRequire} = require(`module`);
+const {createRequire, register} = require(`module`);
 const {resolve} = require(`path`);
+const {pathToFileURL} = require(`url`);
 
 const relPnpApiPath = "../../../../.pnp.cjs";
 
 const absPnpApiPath = resolve(__dirname, relPnpApiPath);
 const absRequire = createRequire(absPnpApiPath);
 
+const absPnpLoaderPath = resolve(absPnpApiPath, `../.pnp.loader.mjs`);
+const isPnpLoaderEnabled = existsSync(absPnpLoaderPath);
+
 if (existsSync(absPnpApiPath)) {
   if (!process.versions.pnp) {
     // Setup the environment to be able to require typescript/lib/tsserverlibrary.js
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/sdks/typescript/lib/typescript.js

@@ -1,18 +1,25 @@
 #!/usr/bin/env node
 
 const {existsSync} = require(`fs`);
-const {createRequire} = require(`module`);
+const {createRequire, register} = require(`module`);
 const {resolve} = require(`path`);
+const {pathToFileURL} = require(`url`);
 
 const relPnpApiPath = "../../../../.pnp.cjs";
 
 const absPnpApiPath = resolve(__dirname, relPnpApiPath);
 const absRequire = createRequire(absPnpApiPath);
 
+const absPnpLoaderPath = resolve(absPnpApiPath, `../.pnp.loader.mjs`);
+const isPnpLoaderEnabled = existsSync(absPnpLoaderPath);
+
 if (existsSync(absPnpApiPath)) {
   if (!process.versions.pnp) {
     // Setup the environment to be able to require typescript
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/versions/e9a5017b.yml

@@ -0,0 +1,10 @@
+releases:
+  "@yarnpkg/eslint-config": major
+  "@yarnpkg/pnp": patch
+  "@yarnpkg/sdks": patch
+
+declined:
+  - "@yarnpkg/plugin-nm"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/nm"
+  - "@yarnpkg/pnpify"