如何返回结果值 out 函数 JavaScript

Question

how to return the result of response.on which is the result variable outside of response.on and under the function SignIn how to return the result of response.on which is the result variable outside of response.on and under the function SignIn

const signIn = async (password) => {
    var request = new DeviceAuthQuery();
    request.setPassword(password);
    var response = client.authenticate(request, {}, (err, response) => {
        console.log("Request Sent 1111");
    });
    return response.on('data', function (reply) {
        console.log("Data Received 2222");
        console.log('Data: 22222' + reply.getAuthjwt());
        var result = reply.getAuthjwt();
        return result
    });
    console.log("the result is==>", result)

    response.on('status', function (status) {
        console.log("Response Status:");
        console.log('Code: ' + status.code);
        console.log('Details: ' + status.details);
        if (status.metadata) {
            console.log("Received metadata");
            console.log(status.metadata);
        }
    });

    response.on('error', function (err) {
        console.log("Error:");
        console.log('Error Code: ' + err.code);
        console.log('Error Message: ' + err.message)
    });

}

export {
    signIn
};

Answer 1

You will have to remove the return statement before response.on('data',..) This return statement will return to the function caller and your console.log call beneath is unreachable code. And like @Learn for Fun mentioned in the comments you could store the result in a variable outside the callbacks scope:

signIn = async (password) => {
    var request = new DeviceAuthQuery();
    request.setPassword(password);
    var response = client.authenticate(request, {}, (err, response) => {
      console.log('Request Sent 1111');
    });

    let dataResponse;

    response.on('data', function(reply) {
      console.log('Data Received 2222');
      console.log('Data: 22222' + reply.getAuthjwt());
      dataResponse = reply.getAuthjwt();
    });
    console.log('the result is==>', dataResponse);

    response.on('status', function(status) {
      console.log('Response Status:');
      console.log('Code: ' + status.code);
      console.log('Details: ' + status.details);
      if (status.metadata) {
        console.log('Received metadata');
        console.log(status.metadata);
      }
    });

    response.on('error', function(err) {
      console.log('Error:');
      console.log('Error Code: ' + err.code);
      console.log('Error Message: ' + err.message);
    });

  };