26 lines
510 B
Plaintext
26 lines
510 B
Plaintext
import type {IsEqual} from './is-equal';
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/**
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Returns a boolean for whether two given types are both true.
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Use-case: Constructing complex conditional types where multiple conditions must be satisfied.
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@example
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```
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import type {And} from 'type-fest';
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And<true, true>;
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//=> true
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And<true, false>;
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//=> false
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```
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@see {@link Or}
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*/
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export type And<A extends boolean, B extends boolean> = [A, B][number] extends true
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? true
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: true extends [IsEqual<A, false>, IsEqual<B, false>][number]
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? false
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: never;
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