emitMany(values) {
        if (this._state !== 0 /* AsyncIterableSourceState.Initial */) {
            return;
        }
        // it is important to add new values at the end,
        // as we may have iterators already running on the array
        this._results = this._results.concat(values);
        this._onStateChanged.fire();
    }
The values will be appended at the end.

**NOTE** If `resolve()` or `reject()` have already been called, this method has no effect.