Simple memoize method decorator in TS

memoizeMethodDecorator.ts

function memoize(_target: object, _key: string, descriptor: PropertyDescriptor) {
  const cache = {};
  const original = descriptor.value;

  descriptor.value = async function(...args: any[]) {
    const argsStr = JSON.stringify(args);

    cache[argsStr] = cache[argsStr] || original.apply(this, args);
    return cache[argsStr];
  };
}