Solution for error 'RangeError: timeZone is not supported.' when unit testing Intl API. Caused by Node not supporting time zones

Solution for 'warn chunk commons [mini-css-extract-plugin]' error in Gatsby JS error in log. Conflicting order warning.

Updating React Material UI Core causes error: 'Failed prop type: The prop `disableBackdropClick` of `ForwardRef(Dialog)` is deprecated' - SOLVED! With example.

Solution for adding media.net ad script to React website. Provides a React component for showing media.net adverts. Simple example of how to add script to a website.

Solution to YouTube videos/iframes negatively effecting website load speed. Use Intersection Observer API To Lazy Load. React component included in article.

How to unit test a React parent component logic, and check that a child component is passed the correct props. Test if a component is called with expected argument using React Testing Library.

Helper function to measure the execution time of code in JS and add X seconds to delay. Time asynchronous function and sleep code for specific time, including await time.

Solved: Error 'Unsupported prop change on Elements: You cannot change the `stripe` prop after setting it.'. useEffect and useState to fix and dynamically set.

Struggling to mock the Date in Jest using CRA? Need consistant global Date testing for React? This article provides the solution.

TypeError: Cannot set property 'fillStyle' of null when using lottie-react in Jest testing solved.