refactor(tsc-wrapped): move tsc-wrapped to the packages directory (#18160)

packages/tsc-wrapped/test/test_support.ts

@@ -0,0 +1,28 @@
+/**
+ * @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
+ */
+
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
+
+const tmpdir = process.env.TEST_TMPDIR || os.tmpdir();
+
+export function writeTempFile(name: string, contents: string): string {
+  // TEST_TMPDIR is set by bazel.
+  const id = (Math.random() * 1000000).toFixed(0);
+  const fn = path.join(tmpdir, `tmp.${id}.${name}`);
+  fs.writeFileSync(fn, contents);
+  return fn;
+}
+
+export function makeTempDir(): string {
+  const id = (Math.random() * 1000000).toFixed(0);
+  const dir = path.join(tmpdir, `tmp.${id}`);
+  fs.mkdirSync(dir);
+  return dir;
+}