Resolve the error message "variable is utilized prior to assignment"

Looking at the code snippet below,

import { STS } from 'aws-sdk'

const sts = new STS({
    region: 'us-east-1'
});
let accessKeyId: string
let secretAccessKey: string

sts.assumeRole(params, function(err, data) {
    if (err) {
        console.log(err, err.stack);
    } else {
        accessKeyId = data.Credentials?.AccessKeyId || '';
        secretAccessKey = data.Credentials?.SecretAccessKey || '';
    }
}); 

console.log(accessKeyId);
console.log(secretAccessKey);

When working in VS Code, I encountered an error stating "Variable 'accessKeyId' is used before being assigned." How can I ensure that these variables are set outside of the assumeRole() SDK call?

Answer №1

accessKeyId is being referenced before it has been assigned a value. This could be due to the asynchronous nature of the function assumeRole, where there may be some delay in execution before the callback is triggered.

To ensure that you are using a valid value for accessKeyId, make sure to access it only after it has been assigned within the callback function.

Answer №2

Ensure that the code within the return block only executes once the data has been returned successfully.

{
if (err) {
    console.log(err, err.stack);
} else {

    accessKeyId = data.Credentials?.AccessKeyId || '';
    secretAccessKey = data.Credentials?.SecretAccessKey || '';
//implement the necessary logic here
    }
}); 

Consider encapsulating Suggestion 2 in a function that waits for an asynchronous operation to complete before utilizing the variable.

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