Function validateKey

http/unstable_structured_fields.ts:1418–1432

(key: string)

}

function validateKey(key: string): void {
  if (key.length === 0) {
    throw new TypeError("Key cannot be empty");
  }

  if (!isKeyStart(key[0]!)) {
    throw new TypeError("Key must start with lowercase letter or '*'");
  }

  for (let i = 1; i < key.length; i++) {
    if (!isKeyChar(key[i]!)) {
      throw new TypeError(`Invalid character in key at position ${i}`);
    }
  }
}