Method asyncVariant

web/src/runtime.ts:1813–1827

(...args: Array<any>)

    override = false
  ): void {
    const asyncVariant = (...args: Array<any>): void => {
      const fargs = args.slice(0, args.length - 1);
      // need to keep it alive until callback is fulfilled.
      const callback = this.detachFromCurrentScope(args[args.length - 1] as PackedFunc);
      const promise: Promise<any> = func(...fargs);
      const onFulfilled = (rv: any) => {
        callback(this.scalar(AsyncCallbackCode.kReturn, "int32"), rv);
        callback.dispose();
      };
      const onRejected = (reason: any) => {
        callback(this.scalar(AsyncCallbackCode.kException, "int32"), reason.toString());
        callback.dispose();
      };
      promise.then(onFulfilled, onRejected);
    };
    this.registerFunc("__async." + name, asyncVariant, override);
  }