Patch TypeScript PnP resolution for VSCode SDK

Add a ts-pnp-backed sdk.user.cjs hook so the Yarn TypeScript SDK can resolve package exports and type references under Plug'n'Play.

The hook is anchored to the workspace instead of process.cwd(), which fixes VSCode tsserver startup when the server process starts from /.

.yarn/sdks/typescript/lib/sdk.user.cjs

@@ -0,0 +1,82 @@
+const {createRequire} = require(`module`);
+const fs = require(`fs`);
+const path = require(`path`);
+
+const workspaceRoot = path.resolve(__dirname, `../../../../`);
+const workspaceRequire = createRequire(path.join(workspaceRoot, `package.json`));
+const {resolveModuleName: resolvePnPModuleName} = workspaceRequire(`ts-pnp`);
+const debugLogPath = path.join(workspaceRoot, `.yarn/sdks/typescript/sdk-user.log`);
+
+const wrappedExports = new WeakMap();
+
+function debugLog(...args) {
+  try {
+    fs.appendFileSync(debugLogPath, `${new Date().toISOString()} ${args.join(` `)}\n`);
+  } catch {}
+}
+
+function wrapResolver(target, property) {
+  const original = target[property];
+  if (typeof original !== `function`) {
+    return original;
+  }
+
+  return function patchedResolver(request, issuer, compilerOptions, host, ...rest) {
+    let result;
+    try {
+      result = original.call(this, request, issuer, compilerOptions, host, ...rest);
+    } catch (error) {
+      debugLog(`original-${property}-throw`, request, issuer, error && (error.stack || error.message || String(error)));
+      throw error;
+    }
+
+    if (result?.resolvedModule || result?.resolvedTypeReferenceDirective) {
+      return result;
+    }
+
+    try {
+      return resolvePnPModuleName(
+        request,
+        issuer,
+        compilerOptions,
+        host,
+        (nextRequest, nextIssuer, nextOptions, nextHost) =>
+          original.call(this, nextRequest, nextIssuer, nextOptions, nextHost, ...rest)
+      );
+    } catch (error) {
+      debugLog(`pnp-${property}-throw`, request, issuer, error && (error.stack || error.message || String(error)));
+      throw error;
+    }
+  };
+}
+
+module.exports = exports => {
+  if (!exports || (typeof exports !== `object` && typeof exports !== `function`)) {
+    return exports;
+  }
+
+  if (wrappedExports.has(exports)) {
+    return wrappedExports.get(exports);
+  }
+
+  const proxy = new Proxy(exports, {
+    get(target, property, receiver) {
+      if (property === `resolveModuleName` || property === `resolveTypeReferenceDirective`) {
+        return wrapResolver(target, property);
+      }
+
+      return Reflect.get(target, property, receiver);
+    },
+  });
+
+  wrappedExports.set(exports, proxy);
+  return proxy;
+};
+
+process.on(`uncaughtException`, error => {
+  debugLog(`uncaughtException`, error && (error.stack || error.message || String(error)));
+});
+
+process.on(`unhandledRejection`, error => {
+  debugLog(`unhandledRejection`, error && (error.stack || error.message || String(error)));
+});

package.json

@@ -38,6 +38,7 @@
     "prettier": "^3.8.1",
     "react-test-renderer": "^19.2.4",
     "ts-node": "^10.9.2",
+    "ts-pnp": "^1.2.0",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.56.1",
     "vite": "^7.3.1",

yarn.lock

@@ -7101,6 +7101,7 @@ __metadata:
     react-router-dom: "npm:^7.13.1"
     react-test-renderer: "npm:^19.2.4"
     ts-node: "npm:^10.9.2"
+    ts-pnp: "npm:^1.2.0"
     typescript: "npm:^5.9.3"
     typescript-eslint: "npm:^8.56.1"
     vite: "npm:^7.3.1"
@@ -7224,6 +7225,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"ts-pnp@npm:^1.2.0":
+  version: 1.2.0
+  resolution: "ts-pnp@npm:1.2.0"
+  peerDependenciesMeta:
+    typescript:
+      optional: true
+  checksum: 10c0/ff32b4f810f9d99f676d70fe2c0e327cb6c812214bd4fc7135870b039f9e85a85b2c20f8fe030d9bd36e9598a12faa391f10aecb95df624b92f1af6bd47dc397
+  languageName: node
+  linkType: hard
+
 "tsconfig-paths@npm:^3.15.0":
   version: 3.15.0
   resolution: "tsconfig-paths@npm:3.15.0"
@@ -7398,11 +7409,11 @@ __metadata:
 
 "typescript@patch:typescript@npm%3A^5.9.3#optional!builtin<compat/typescript>":
   version: 5.9.3
-  resolution: "typescript@patch:typescript@npm%3A5.9.3#optional!builtin<compat/typescript>::version=5.9.3&hash=8c6c40"
+  resolution: "typescript@patch:typescript@npm%3A5.9.3#optional!builtin<compat/typescript>::version=5.9.3&hash=5786d5"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 10c0/6f7e53bf0d9702350deeb6f35e08b69cbc8b958c33e0ec77bdc0ad6a6c8e280f3959dcbfde6f5b0848bece57810696489deaaa53d75de3578ff255d168c1efbd
+  checksum: 10c0/ad09fdf7a756814dce65bc60c1657b40d44451346858eea230e10f2e95a289d9183b6e32e5c11e95acc0ccc214b4f36289dcad4bf1886b0adb84d711d336a430
   languageName: node
   linkType: hard