useDevWarning
Fires a dev-only "Component: message" console warning once per mount while the condition holds. It is the render-safe way for a component to flag misuse: warning straight from the render body repeats on every render, and gating it with state adds a re-render, so this uses a ref and an effect instead. For a warning outside a component, use the imperative devWarn utility.
Signature
useDevWarning(component: string, message: string, condition: boolean = true): void| Name | Type and behavior |
|---|---|
component | string · requiredComponent or hook name, used as the message prefix. |
message | string · requiredWhat went wrong and how to fix it. |
condition | boolean · optional · default trueWhether to warn. |
Usage
Fires a dev-only "Component: message" console warning once per mount while the condition holds. It is the render-safe way for a component to flag misuse: warning straight from the render body repeats on every render, and gating it with state adds a re-render, so this uses a ref and an effect instead. For a warning outside a component, use the imperative devWarn utility.
- Say what is wrong and what the builder should do instead; the message is the whole value of the warning.
- Warn about combinations the types cannot express, such as two mutually exclusive props being set together.
- Use it for anything a user could see or for runtime error handling; it is stripped from production builds.