ReferenceError:未在对象上定义FormData。<anonymous>

在下面我得到一个错误…`ReferenceError:FormData未定义 在物体上。

我不太确定我在这里遗漏了什么,因为在我看来它是正确的。

export const setFlightAwareAlert = functions.https.onRequest(async (request, response) => {
    const body: {[key: string]: any} = request.body;
    const data = new FormData();
    Object.keys(body).forEach(key => data.append(key, body[key]));
    const alert_id = await axios.post(urls.setAlert, data, {
        headers: {
            'Authentication': `Basic ${btoa(`${FlightAwareCredentials.user}${FlightAwareCredentials.password}`)}`,
        },
        withCredentials: true
    });
    response.status(alert_id.status);
    response.json(alert_id.data);
});