Method upsertLine

src/tools/network/network-optimize.ts:194–200

Insert or replace a single line in a config file (creating it if needed).

(file: string, matcher: RegExp, line: string)

  /** Insert or replace a single line in a config file (creating it if needed). */
  private async upsertLine(file: string, matcher: RegExp, line: string): Promise<void> {
    let body = '';
    try { body = await fs.readFile(file, 'utf8'); } catch { /* new file */ }
    if (matcher.test(body)) body = body.replace(matcher, line);
    else body = (body && !body.endsWith('\n') ? body + '\n' : body) + line + '\n';
    await fs.writeFile(file, body);
  }
}