fix(third-party-dts-extractor): correctly sets the source of the pack…

.changeset/chilled-eels-shout.md

@@ -0,0 +1,5 @@
+---
+'@module-federation/third-party-dts-extractor': patch
+---
+
+fix(third-party-dts-extractor): correctly sets the source of the package types

packages/third-party-dts-extractor/src/ThirdPartyExtractor.spec.ts

@@ -8,12 +8,17 @@ describe('ThirdPartyExtractor', () => {
   const destDir = join(projectRoot, 'dist', 'third-party-extractor');
   const thirdPartyExtractor = new ThirdPartyExtractor(destDir, projectRoot);
 
-  it('should correctly infer pkg dir with types field in package.json', () => {
+  it("should correctly infer pkg's types dir with types/typings field in package.json", () => {
     const tsupDir = thirdPartyExtractor.inferPkgDir('tsup');
-    const pkgJson = fs.readJSONSync(`${tsupDir}/package.json`);
 
-    expect(pkgJson.name).toBe('tsup');
-    expect(Boolean(pkgJson.types || pkgJson.typings)).toEqual(true);
+    if (!tsupDir) {
+      throw new Error('tsup dir not found');
+    }
+
+    const dirContent = fs.readdirSync(tsupDir);
+    const dtsFiles = dirContent.filter((file) => file.endsWith('.d.ts'));
+
+    expect(dtsFiles.length).toBeGreaterThan(0);
   });
 
   it('should correctly infer pkg types dir without types field in package.json', () => {

packages/third-party-dts-extractor/src/ThirdPartyExtractor.ts

@@ -2,7 +2,7 @@ import findPkg from 'find-pkg';
 import fs from 'fs-extra';
 import path from 'path';
 import resolve from 'resolve';
-import { getTypedName } from './utils';
+import { getTypedName, getPackageRootDir } from './utils';
 
 const ignoredPkgs = ['typescript'];
 
@@ -48,7 +48,8 @@ class ThirdPartyExtractor {
       if (isNodeUtils(importEntry, importPath)) {
         return;
       }
-      const pkgJsonPath = findPkg.sync(importEntry) as string;
+      const packageDir = getPackageRootDir(importPath);
+      const pkgJsonPath = path.join(packageDir, 'package.json');
 
       const dir = path.dirname(pkgJsonPath);
       const pkg = JSON.parse(fs.readFileSync(pkgJsonPath, 'utf-8')) as Record<
@@ -61,8 +62,9 @@ class ThirdPartyExtractor {
       }
 
       if (types) {
-        this.addPkgs(pkg.name, dir);
-        return dir;
+        const typesDir = path.dirname(path.resolve(dir, types));
+        this.addPkgs(pkg.name, typesDir);
+        return typesDir;
       } else if (fs.existsSync(path.resolve(dir, 'index.d.ts'))) {
         this.addPkgs(pkg.name, dir);
         return dir;

packages/third-party-dts-extractor/src/utils.ts

@@ -1,5 +1,33 @@
+import path from 'node:path';
+
 function getTypedName(name: string) {
   return `@types/${name.replace(/^@/, '').replace('/', '__')}`;
 }
 
-export { getTypedName };
+function getPackageRootDir(packageName: string | undefined): string {
+  if (!packageName) {
+    throw new Error('No package name provided.');
+  }
+
+  let packageRootDir: string;
+
+  try {
+    // First, try resolving the package's package.json
+    const packageJsonPath = require.resolve(`${packageName}/package.json`);
+    packageRootDir = path.dirname(packageJsonPath);
+  } catch (error) {
+    // If resolving package.json fails, fall back to resolving the package itself
+    try {
+      const packageEntryPath = require.resolve(packageName);
+      packageRootDir = path.dirname(packageEntryPath);
+    } catch (fallbackError) {
+      throw new Error(
+        `Could not resolve package "${packageName}" or its package.json.`,
+      );
+    }
+  }
+
+  return packageRootDir;
+}
+
+export { getTypedName, getPackageRootDir };