chore: enforce pinned dependencies (#7238)

* chore: enforce pinned dependencies

Because we don't check our `package-lock.json` in, we can end up with
different versions installed locally vs CI, or even two devs having
different versions. Let's pin and enforce we pin every version to
avoid this.

scripts/ensure-pinned-deps.ts

@@ -0,0 +1,37 @@
+/**
+ * Copyright 2021 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import packageJson from '../package.json';
+
+const allDeps = { ...packageJson.dependencies, ...packageJson.devDependencies };
+
+const invalidDeps = new Map<string, string>();
+
+for (const [depKey, depValue] of Object.entries(allDeps)) {
+  if (/[0-9]/.test(depValue[0])) {
+    continue;
+  }
+
+  invalidDeps.set(depKey, depValue);
+}
+
+if (invalidDeps.size > 0) {
+  console.error('Found non-pinned dependencies in package.json:');
+  console.log([...invalidDeps.keys()].map((k) => `  ${k}`).join('\n'));
+  process.exit(1);
+}
+
+process.exit(0);