callbacks in amazon-cognito-identity-js

When working with amazon-cognito-identity-js, I encountered an issue with the callback function. This is what it currently looks like:

cognitoUser?.getUserAttributes((err, results) => {
  if (err) {
    console.log(err.message || JSON.stringify(err));
    return err.message || JSON.stringify(err);
  }
  if (results != undefined) {
    return results[2].Value;
  }
  return undefined;
});

Although I am able to successfully log the correct value from results[2], I am struggling to return this value. I attempted to use util-promisify, but unfortunately this npm package is intended for Webpack and not suitable for my Angular application. How can I implement a Promise instead?

Here is the declaration for getUserAttributes():

public getUserAttributes(
callback: NodeCallback<Error, CognitoUserAttribute[]>
): void;

Answer №1

Converting a callback function into a promise is a simple process

function fetchUserDataByIndex(index) {
    return new Promise((resolve, reject) => {
        userDatabase.getAttributes((error, data) => {
            if (error) {
                reject(error);
            } else {
                resolve(data[index].value);
            }
        });
    });
}

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