feat(@ngtools/webpack): add support for traceResolution

Closes #8676

packages/ngtools/webpack/src/compiler_host.ts

@@ -246,6 +246,10 @@ export class WebpackCompilerHost implements ts.CompilerHost {
       return this.readFile(fileName);
     }
   }
+
+  trace(message: string) {
+    console.log(message);
+  }
 }
 
 

tests/legacy-cli/e2e/tests/misc/trace-resolution.ts

@@ -0,0 +1,22 @@
+import { ng } from '../../utils/process';
+import { updateJsonFile } from '../../utils/project';
+
+export default async function () {
+  await updateJsonFile('tsconfig.json', tsconfig => {
+    tsconfig.compilerOptions.traceResolution = true;
+  });
+
+  const { stdout: stdoutTraced } = await ng('build');
+  if (!/Resolving module/.test(stdoutTraced)) {
+    throw new Error(`Modules resolutions must be printed when 'traceResolution' is enabled.`);
+  }
+
+  await updateJsonFile('tsconfig.json', tsconfig => {
+    tsconfig.compilerOptions.traceResolution = false;
+  });
+
+  const { stdout: stdoutUnTraced } = await ng('build');
+  if (/Resolving module/.test(stdoutUnTraced)) {
+    throw new Error(`Modules resolutions must not be printed when 'traceResolution' is disabled.`);
+  }
+}