Resolving the TypeError: Cannot read property 'goto' of undefined in Playwright and TypeScript

Learn how to fix the TypeError in Playwright when working with TypeScript in automated tests. This guide explains the root cause and provides a clear solution.
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Fixing the TypeError: Cannot read property 'goto' of undefined in Playwright

If you're new to programming or test automation, encountering errors can be frustrating. One common issue you might face while using TypeScript and Playwright is the error: TypeError: Cannot read property 'goto' of undefined. In this guide, we’ll dive into the details of this error, understand its cause, and provide a clear solution.

Understanding the Problem

What Does the Error Mean?

This specific error indicates that your code is trying to access a property (goto in this case) on an object that has not been properly defined, meaning it is undefined. This typically occurs due to improper initialization or assignment within your class.

Where it Happens

The error you've encountered is occurring in the goto method of your LoginPage class:

[[See Video to Reveal this Text or Code Snippet]]

Breaking Down the Solution

Let's identify how to resolve this issue by ensuring that the page property is correctly assigned in the class constructor.

Steps to Fix

Update the Constructor:

Here’s the corrected code:

[[See Video to Reveal this Text or Code Snippet]]

Modified Class Definition:
With the constructor modified, your LoginPage class should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Final Test Case Code

After making sure the LoginPage class is correctly set up, your test case should now run without throwing the TypeError. Here’s the sample test case for context:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion