Simple AWS Lambda function that waits as long as it is told

lamda.js

exports.handler = ({queryStringParameters: {wait}}, context, callback) => {

    const response = {
        statusCode: 200,
        isBase64Encoded: false,
        headers: {"Access-Control-Allow-Origin": "*"},
        body: JSON.stringify({res: `This has taken ${wait} milliseconds.`}),
    };

    const startTime = Date.now();
    while (Date.now() - startTime < wait) {/** CALCULATING... **/}

    callback(null, response);
};