feat(core): Support ${configDir}

Author: InSyncWithFoo

packages/core/src/config.test.ts

@@ -378,4 +378,24 @@ describe('readConfigFile', () => {
       ]);
     });
   });
+  describe('configDir template variable', () => {
+    test('correctly resolves configDir', async () => {
+      const iff = await createIFF({
+        'apps/app/tsconfig.json': dedent`
+          {
+            "extends": ["../../tsconfig.a.json"]
+          }
+        `,
+        'tsconfig.a.json': dedent`
+          {
+            "include": ["./types", "\${configDir}/src"],
+            "exclude": ["./dist", "\${configDir}/dist"]
+          }
+        `,
+      });
+      const result = readConfigFile(iff.join('apps/app'));
+      expect(result.includes).toEqual([iff.join('types'), iff.join('apps/app/src')]);
+      expect(result.excludes).toEqual([iff.join('dist'), iff.join('apps/app/dist')]);
+    });
+  });
 });

packages/core/src/config.ts

@@ -256,11 +256,17 @@ export function readConfigFile(project: string): CMKConfig {
   }
 
   const basePath = dirname(configFileName);
+
+  // https://github.com/microsoft/TypeScript/blob/55423abe4d029017f19b6e4c32097591994836b4/src/compiler/commandLineParser.ts#L3299-L3328
+  function resolvePath(path: string) {
+    return join(basePath, path.replace(/^\$\{configDir}/i, './'));
+  }
+
   return {
     // If `include` is not specified, fallback to the default include spec。
     // ref: https://github.com/microsoft/TypeScript/blob/caf1aee269d1660b4d2a8b555c2d602c97cb28d7/src/compiler/commandLineParser.ts#L3102
-    includes: (parsedTsConfig.config.includes ?? [DEFAULT_INCLUDE_SPEC]).map((i) => join(basePath, i)),
-    excludes: (parsedTsConfig.config.excludes ?? []).map((e) => join(basePath, e)),
+    includes: (parsedTsConfig.config.includes ?? [DEFAULT_INCLUDE_SPEC]).map(resolvePath),
+    excludes: (parsedTsConfig.config.excludes ?? []).map(resolvePath),
     dtsOutDir: join(basePath, parsedTsConfig.config.dtsOutDir ?? 'generated'),
     arbitraryExtensions: parsedTsConfig.config.arbitraryExtensions ?? false,
     namedExports: parsedTsConfig.config.namedExports ?? false,