Remove deleted strings after one month

ts/scripts/remove-strings.ts

@@ -0,0 +1,66 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import fs from 'fs';
+import path from 'path';
+import { spawnSync } from 'child_process';
+import type { StdioOptions } from 'child_process';
+
+import { MONTH } from '../util/durations';
+import { isOlderThan } from '../util/timestamp';
+
+const ROOT_DIR = path.join(__dirname, '..', '..');
+const MESSAGES_FILE = path.join(ROOT_DIR, '_locales', 'en', 'messages.json');
+const SPAWN_OPTS = {
+  cwd: ROOT_DIR,
+  stdio: [null, 'pipe', 'inherit'] as StdioOptions,
+};
+
+const messages = JSON.parse(fs.readFileSync(MESSAGES_FILE).toString());
+
+const stillUsed = new Set<string>();
+
+for (const [key, value] of Object.entries(messages)) {
+  const match = (value as Record<string, string>).description?.match(
+    /\(\s*deleted\s+(\d{4}\/\d{2}\/\d{2})\s*\)/
+  );
+  if (!match) {
+    continue;
+  }
+
+  const deletedAt = new Date(match[1]).getTime();
+  if (!isOlderThan(deletedAt, MONTH)) {
+    continue;
+  }
+
+  // Find uses in either:
+  // - `i18n('key')`
+  // - `<Intl id="key"/>`
+  const { status, stdout } = spawnSync(
+    'git',
+    ['grep', '--extended-regexp', `'${key}'|id="${key}"`],
+    SPAWN_OPTS
+  );
+
+  // Match found
+  if (status === 0) {
+    console.error(
+      `ERROR: String is still used: "${key}", deleted on ${match[1]}`
+    );
+    console.error(stdout.toString().trim());
+    console.error('');
+    stillUsed.add(key);
+  } else {
+    console.log(`Removing string: "${key}", deleted on ${match[1]}`);
+    delete messages[key];
+  }
+}
+
+if (stillUsed.size !== 0) {
+  console.error(
+    `ERROR: Didn't remove ${[...stillUsed]} strings because of errors above`
+  );
+  console.error('ERROR: Not saving changes');
+  process.exit(1);
+}
+fs.writeFileSync(MESSAGES_FILE, `${JSON.stringify(messages, null, 2)}\n`);