fix(dts-plugin): infer root dir from tsconfig references

Author: eezhal92

.changeset/quiet-clouds-report.md

@@ -0,0 +1,5 @@
+---
+'@module-federation/dts-plugin': patch
+---
+
+Infer root dir from "references" property for solution-style tsconfig

packages/dts-plugin/src/core/configurations/remotePlugin.test.ts

@@ -204,4 +204,19 @@ describe('hostPlugin', () => {
       });
     });
   });
+
+  describe('successfully parse tsconfig with project references', () => {
+    it.each([
+      './testconfig-reference.test.json',
+      './testconfig-reference-2.test.json',
+    ])('infers rootDir from project references', (tsConfigFile) => {
+      const tsConfigPath = join(__dirname, tsConfigFile);
+      const { tsConfig } = retrieveRemoteConfig({
+        moduleFederationConfig,
+        tsConfigPath,
+      });
+
+      expect(tsConfig.compilerOptions.rootDir).toBe(resolve(__dirname));
+    });
+  });
 });

packages/dts-plugin/src/core/configurations/remotePlugin.ts

@@ -49,6 +49,20 @@ function getEffectiveRootDir(
     return commonRoot;
   }
 
+  // if there are project references, infer the commonRoot from references
+  if (parsedCommandLine.projectReferences.length) {
+    const commonRoot = parsedCommandLine.projectReferences
+      .filter((file) => file.originalPath.startsWith('./'))
+      .map((file) => file.path)
+      .reduce((commonPath, filePath) => {
+        while (!filePath.startsWith(commonPath)) {
+          commonPath = dirname(commonPath);
+        }
+        return commonPath;
+      }, dirname(parsedCommandLine.projectReferences[0].path));
+    return commonRoot;
+  }
+
   throw new Error(
     'Can not get effective rootDir, please set compilerOptions.rootDir !',
   );

packages/dts-plugin/src/core/configurations/testconfig-reference-2.test.json

@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./testconfig.app.test.json" },
+    { "path": "./testconfig.node.test.json" }
+  ]
+}

packages/dts-plugin/src/core/configurations/testconfig-reference.test.json

@@ -0,0 +1,4 @@
+{
+  "files": [],
+  "references": [{ "path": "./testconfig.test.json" }]
+}