DMleadgen
46d973904b
Next.js website for Rocky Mountain Vending company featuring: - Product catalog with Stripe integration - Service areas and parts pages - Admin dashboard with Clerk authentication - SEO optimized pages with JSON-LD structured data Co-authored-by: Cursor <cursoragent@cursor.com>
52 lines
1.4 KiB
Text
52 lines
1.4 KiB
Text
import type {IsNull} from './is-null';
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/**
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Returns a boolean for whether the given type is `unknown`.
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@link https://github.com/dsherret/conditional-type-checks/pull/16
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Useful in type utilities, such as when dealing with unknown data from API calls.
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@example
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```
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import type {IsUnknown} from 'type-fest';
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// https://github.com/pajecawav/tiny-global-store/blob/master/src/index.ts
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type Action<TState, TPayload = void> =
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IsUnknown<TPayload> extends true
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? (state: TState) => TState,
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: (state: TState, payload: TPayload) => TState;
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class Store<TState> {
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constructor(private state: TState) {}
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execute<TPayload = void>(action: Action<TState, TPayload>, payload?: TPayload): TState {
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this.state = action(this.state, payload);
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return this.state;
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}
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// ... other methods
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}
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const store = new Store({value: 1});
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declare const someExternalData: unknown;
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store.execute(state => ({value: state.value + 1}));
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//=> `TPayload` is `void`
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store.execute((state, payload) => ({value: state.value + payload}), 5);
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//=> `TPayload` is `5`
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store.execute((state, payload) => ({value: state.value + payload}), someExternalData);
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//=> Errors: `action` is `(state: TState) => TState`
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```
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@category Utilities
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*/
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export type IsUnknown<T> = (
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unknown extends T // `T` can be `unknown` or `any`
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? IsNull<T> extends false // `any` can be `null`, but `unknown` can't be
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? true
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: false
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: false
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);
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