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18 lines
802 B
Markdown
18 lines
802 B
Markdown
# `useState`
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```ts
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useState<T>(init?: () => T | Ref<T>): Ref<T>
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useState<T>(key: string, init?: () => T | Ref<T>): Ref<T>
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```
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* **key**: A unique key ensuring that data fetching is properly de-duplicated across requests. If you do not provide a key, then a key that is unique to the file and line number of the instance of `useState` will be generated for you.
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* **init**: A function that provides initial value for the state when not initiated. This function can also return a `Ref`.
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* **T**: (typescript only) Specify the type of state
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::alert{type=warning}
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Because the data inside `useState` will be serialized to JSON, it is important that it does not contain anything that cannot be serialized, such as classes, functions or symbols.
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::
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::ReadMore{link="/getting-started/state-management"}
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::
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