react-hooks-js/void-use-memo

Validates that useMemos always return a value and that the result of the useMemo is used by the component/hook. See [`useMemo()` docs](https://react.dev/reference/react/useMemo) for more information.

Validation prompt

Confirm the detector match and collect the required evidence before deciding whether an edit is warranted.

Fires when a useMemo's return value is never consumed: not assigned, not destructured, not returned from the surrounding component/hook. The cached value is computed and immediately discarded, so the hook is effectively a side-effect call dressed up as memoization.

Suppress when: rare; an unused memo is almost always a mistake.

Evidence boundary

The diagnostic proves only that the detector’s modeled source pattern matched. It does not prove runtime impact, product intent, rendered failure, or that one remediation is correct.

Establish the environment, repository policy, exceptions, and required rendered or runtime evidence before deciding the occurrence.

Record one outcome:

• Confirmed failure: The required evidence establishes the violation.
• Rejected: A documented exception or false-positive predicate applies.
• Needs evidence: Named evidence can still be collected.
• Unavailable: Required evidence cannot be collected in this run.
• Waived with evidence: An authorized, scoped exception applies to an established failure.
• Observation: The review records an optional tradeoff without claiming a defect.

A waiver records its scope, authority, evidence, and review condition. It is not a pass or false positive.

Default severity is registry metadata. Use the occurrence’s JSON severity after repository configuration when ordering real findings.

Fix prompt

Apply this candidate correction only after the required evidence confirms the risk.

Assign the result and reference it downstream (const sorted = useMemo(() => [...items].sort(), [items]); return <List items={sorted} />). If you do not need the value, you do not need the memo: delete it and either move the work to useEffect for synchronization or to an event handler for user-triggered side effects. See https://react.dev/reference/eslint-plugin-react-hooks

Repository-wide copy prompt

Use this repository-wide prompt only after validating each occurrence. For one occurrence, use the guidance above.