Generate Error Boundary in TypeScript using ChatGPT

Hanwen Zhang
3 min readMar 31

--

To handle client-side errors we need an Error Boundary.

If our component has an error, we will render the fallback component (some fallback UI for the user to use the app).

Error boundaries are a way to catch errors in the app and display a fallback UI instead of the component tree that crashed.

getDerivedStateFromError — Update state so the next render will show the fallback UI.

componentDidCatch — You can also log the error to a reporting service.

import React, { Component, ErrorInfo, ReactNode } from 'react';

interface Props {
children?: ReactNode;
fallback?: ReactNode;
}

interface State {
hasError?: boolean;
}

class ErrorBoundary extends Component<Props, State> {
constructor(props: Props) {
super(props);
this.state = { hasError: false };
}

static getDerivedStateFromError(_: Error): State {
return { hasError: true };
}

componentDidCatch(error: Error, errorInfo: ErrorInfo) {
console.error('ErrorBoundary caught an error:', error, errorInfo);
}

render() {
const { hasError } = this.state;
const { children, fallback } = this.props;

if (hasError) {
if ( fallback ) {
return fallback;
} else {
return <h1>Something went wrong.</h1>;
}
}

return children;
}
}

export default ErrorBoundary;

Got the below code explanation from ChatGPT:

This Error Boundary component uses TypeScript to define the Props and State interfaces. The Props interface defines a single required property: children, which is of type ReactNode. The State interface defines three properties: hasError, which is a boolean indicating whether an error has occurred; error, which is an optional Error object that contains information about the error that occurred; and errorInfo, which is an optional ErrorInfo object that contains additional information about the error.

The ErrorBoundary class extends Component from the react package and defines a constructor that sets the initial state of hasError to false.

The getDerivedStateFromError method is a static method that is called when an error occurs within the component. It takes in an error object and returns an object that will update the component's state. In this case, it returns an object that sets hasError to true and error to the error object that was passed in.

The componentDidCatch method is another lifecycle method that is called when an error occurs within the component. It takes in an error object and an error info object, both of which can be used for logging or reporting purposes. In this example, it logs the error and error info to the console and sets the errorInfo property on the component's state.

The render method checks the value of hasError. If it is true, the component returns an error message containing the error message and componentStack property of the errorInfo object. Otherwise, it returns the children prop.

Finally, the ErrorBoundary component is exported as the default export of the module, so it can be imported and used in other components.

Photo by Jonathan Kemper on Unsplash

--

--

Hanwen Zhang

Full-Stack Software Engineer at a Healthcare Tech Company | Document My Coding Journey | Improve My Knowledge | Share Coding Concepts in a Simple Way