Function cachedLookup

packages/node/src/typescript.ts:105–115

* Cached fs operation wrapper.

(fn: (arg: string) => T)

 * Cached fs operation wrapper.
 */
function cachedLookup<T>(fn: (arg: string) => T): (arg: string) => T {
  const cache = new Map<string, T>();

  return (arg: string): T => {
    if (!cache.has(arg)) {
      cache.set(arg, fn(arg));
    }

    return cache.get(arg) as T;
  };
}

const require_ = createRequire(__filename);