Function prefixKey

packages/client/lib/client/parser.ts:11–22

(keyPrefix: RedisArgument | undefined, key: RedisArgument)

 * `Buffer.concat` when either side is a `Buffer`.
 */
export function prefixKey(keyPrefix: RedisArgument | undefined, key: RedisArgument): RedisArgument {
  if (keyPrefix === undefined) return key;

  if (typeof keyPrefix === 'string' && typeof key === 'string') {
    return keyPrefix + key;
  }

  return Buffer.concat([
    typeof keyPrefix === 'string' ? Buffer.from(keyPrefix) : keyPrefix,
    typeof key === 'string' ? Buffer.from(key) : key
  ]);
}

/**
 * Applies {@link prefixKey} to every key in a variadic argument, returning a new array.