build: extract interface and util sub compilation from core (#28028)

PR Close #28028

packages/core/src/util/stringify.ts

@@ -0,0 +1,38 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export function stringify(token: any): string {
+  if (typeof token === 'string') {
+    return token;
+  }
+
+  if (token instanceof Array) {
+    return '[' + token.map(stringify).join(', ') + ']';
+  }
+
+  if (token == null) {
+    return '' + token;
+  }
+
+  if (token.overriddenName) {
+    return `${token.overriddenName}`;
+  }
+
+  if (token.name) {
+    return `${token.name}`;
+  }
+
+  const res = token.toString();
+
+  if (res == null) {
+    return '' + res;
+  }
+
+  const newLineIndex = res.indexOf('\n');
+  return newLineIndex === -1 ? res : res.substring(0, newLineIndex);
+}