```ts
/**
 * The KEY=VALUE pairs of a config file, ignoring blank lines and comments.
 */
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("=", 2);
    if (key.trim() === "") throw new Error(`Empty key on line: ${line}`);
    config[key.trim()] = value ? value.trim() : "";
  }
  return config;
}
```