Why use displayName when building React components?

Why use displayName when building React components?

Debugging and Error Messages

The displayName property in React helps create better debugging messages. When an error happens, a clear displayName helps developers find the problematic component faster. If displayName isn't set, React will guess it from the function or class name, but this might not always be correct, especially in complex apps.

Development Tools

React DevTools, a popular tool for inspecting React component trees, uses the displayName property to show component names. This makes it easier to navigate and understand the component hierarchy. Without a proper displayName, components might appear as "Component" or "Anonymous," which can be confusing.

Context Objects

React's Context API also supports the displayName property. Setting a displayName for context objects helps identify the context in DevTools, making it easier to debug context-related issues.

const MyContext = React.createContext();
MyContext.displayName = "MyDisplayName";

ESLint Rules

There are ESLint rules like react/display-name that require the use of displayName in React components. These rules help keep things consistent and make sure all components have clear names, which is especially helpful in big projects.