Is it necessary for all React component props to be marked as readonly in Typescript?

It appears that props should indeed be immutable within the component. Despite my search efforts on Google and Stack Overflow, I couldn't find a definitive answer, so I'm reaching out here for clarification.

Answer №1

When it comes to specificity, it's not about Typescript but rather React.

React is designed to render components based on a specific set of props. If you wish to alter how a component is rendered, the parent must generate new props and pass them down to the children.

The data flow in React is unidirectional, moving from parents to children. It is neither possible nor desirable to mutate props received from parents. Allowing prop mutations could lead to UI issues due to React's component lifecycle. A component only re-renders if the reference of one of its props changes. Mutating props will not trigger a re-render, resulting in a mismatch between your UI and data.

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