Fake reflect-metadata

fake-reflect-metadata

const Metadata = new WeakMap();

function defineMetadata(key, value, target) {
  if (!Metadata.get(target)) {
    Metadata.set(target, new Map());
  }
  const map = Metadata.get(target);
  map.set(key, value);
}

function getMetadata(key, target) {
  const map = Metadata.get(target);
  return map ? map.get(key) : '';
}

Object.defineProperty(Reflect, 'defineMetadata', {
  configurable: true,
  writable: true,
  value: defineMetadata,
});

Object.defineProperty(Reflect, 'getMetadata', {
  configurable: true,
  writable: true,
  value: getMetadata,
});