Use TypeScript in strict mode and type your props

TypeScript catches wrong props, missing cases and null values before they reach users, and it makes refactors safe.

• Turn on strict in tsconfig.json from the start; enabling it later on a large codebase is painful.
• Type props with a plain type or interface.
• Extend native props with React.ComponentProps<'button'> instead of retyping them.

Avoid any: it silently turns off type checking. When you really do not know the shape, for example for data from an API, use unknown and narrow it before use.