Function copySymbolProperties

packages/zone.js/lib/common/utils.ts:394–416

(src: any, dest: any)

}

export function copySymbolProperties(src: any, dest: any) {
  if (typeof (Object as any).getOwnPropertySymbols !== 'function') {
    return;
  }
  const symbols: any = (Object as any).getOwnPropertySymbols(src);
  symbols.forEach((symbol: any) => {
    const desc = Object.getOwnPropertyDescriptor(src, symbol);
    Object.defineProperty(dest, symbol, {
      get: function () {
        return src[symbol];
      },
      set: function (value: any) {
        if (desc && (!desc.writable || typeof desc.set !== 'function')) {
          // if src[symbol] is not writable or not have a setter, just return
          return;
        }
        src[symbol] = value;
      },
      enumerable: desc ? desc.enumerable : true,
      configurable: desc ? desc.configurable : true,
    });
  });
}

let shouldCopySymbolProperties = false;