How do I know if a component is doing too much?
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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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.
Yes. If a piece of a component would be useful in other places, extract it into its own component so it can be shared. Reusable pieces should not be buried inside a larger component.
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