rejectIfTimeout

The rejectIfTimeout function is a utility method provided by the web3.utils module that enforces a timeout on a promise, so that it can be rejected if it takes too long to complete. The function takes two parameters: timeout and error.

The function takes in two parameters:

• timeout: A positive number that represents the timeout to be enforced in milliseconds. The timeout starts when the rejectIfTimeout function is called and continues until the promise is resolved or rejected.
• error: An instance of the Error class that is thrown if the timeout is reached. The error message can be customized to provide additional information about the timeout.

The rejectIfTimeout function returns an array containing two elements:

• The first element is the timeout ID, which can be used to clear the timeout using the clearTimeout function.
• The second element is a Promise that will be rejected with the error parameter if the timeout is reached. If the promise is resolved before the timeout is reached, the Promise is resolved with the value returned by the promise.

Here's an example of how the rejectIfTimeout function can be used:

In this example, the rejectIfTimeout function is called with a timeout of 100 milliseconds and an error message of "time out". The function returns an array containing the timeout ID and a Promise that will be rejected with the error message if the timeout is reached. The Promise is then resolved with the value "hello" after 5 seconds, and the timeout is cleared using the clearTimeout function.