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React Class Components → React Hooks (Function Components)

medium

Class components still work in React 19, but no new React features target them. Hooks are idiomatic. Migration is straightforward but time-intensive for large codebases.

Estimated: 4-16h · 6 steps
Progress0%
Step 1: Convert state

this.state = {} → const [value, setValue] = useState(). this.setState({ key: val }) → setValue(val).

Step 2: Convert lifecycle methods

componentDidMount + componentDidUpdate → useEffect with dep array. componentWillUnmount → return cleanup function from useEffect.

Step 3: Convert class methods

Class methods → plain functions or callbacks inside the function component. Bind is no longer needed.

Step 4: Convert context

static contextType → useContext(MyContext). this.context.value → const value = useContext(MyContext).

Step 5: Extract custom hooks

Repeated logic across components → custom useXxx hooks. Replaces mixins and HOC patterns.

Step 6: Remove PureComponent

PureComponent → React.memo(Component) for the same shallow-comparison optimization.

✓ All tests pass, no this references remain, performance equal or better