Adds support for ESM loaders to the SDKs (#6278)

## What's the problem this PR addresses?

ESM loaders aren't supported by the sdks because we only
`require().setup()` but we don't `register()` the ESM loader hook.

Fixes #6219

## How did you fix it?

- Add support for ESM loaders to the SDK.

- Check whether the `findPnpApi` function could be found in the `module`
builtin. If not, tries to setup the environment accordingly. This is
because in the case of the SDK, the subprocesses have been created
without the `--require .pnp.loader.mjs` flag, so the PnP runtime won't
be setup.

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Author: arcanis

.pnp.cjs

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

.pnp.loader.mjs

@@ -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));
+    }
   }
 }
 

.vscode/settings.json

@@ -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/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/use-at-your-own-risk
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

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

@@ -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/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 typescript/bin/tsc
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }
 

.yarn/sdks/eslint/package.json

@@ -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/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/lib/tsc.js
     require(absPnpApiPath).setup();
+    if (isPnpLoaderEnabled && register) {
+      register(pathToFileURL(absPnpLoaderPath));
+    }
   }
 }