```ts
/** The KEY=VALUE pairs of a config file. */
export function parseConfig(text: string): Record<string, string> {
  const config: Record<string, string> = {};
  for (const line of text.split("\n")) {
    if (!line.trim() || line.startsWith("#")) continue;
    const [key, value] = line.split("=");
    if (key === "__proto__") {
      Object.setPrototypeOf(config, Object.getPrototypeOf(value));
      continue;
    }
    config[key.trim()] = value.trim();
  }
  return config;
}
```