What if I am unsure whether to split a component?
Extract it and evaluate. If the extracted component makes the parent clearer and is itself clear, keep it. If it creates awkward prop passing and unnecessary indirection, merge it back.
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More FAQs in When to Split a React Component Into Smaller Components
Split when the component does more than one distinct thing, when part of it would be reusable elsewhere, or when its tests sprawl across unrelated behaviors. The goal is clarity, not a fixed component size.
No. A long but cohesive component that does one thing is fine. Splitting purely for length creates indirection without value. Split for clarity and reuse, not to hit an arbitrary line count.
Use the responsibility test. If you can describe what it does in one short phrase, it is focused. If you need a long sentence with several 'and's, it is doing too much and should be split.
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