```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.replace(/\s+/g, '').split("=");
    if (!key) throw new Error(`Line ${line.trim()} contains no key`);
    config[key] = value.trim();
  }
  return config;
}
```