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c46143f0ac
* chore: update copyright year * fix --------- Co-authored-by: Asher Gomez <ashersaupingomez@gmail.com>
23 lines
659 B
TypeScript
23 lines
659 B
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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import { AssertionError } from "./assertion_error.ts";
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/** Assertion condition for {@linkcode assertFalse}. */
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export type Falsy = false | 0 | 0n | "" | null | undefined;
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/**
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* Make an assertion, error will be thrown if `expr` have truthy value.
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*
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* @example
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* ```ts
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* import { assertFalse } from "https://deno.land/std@$STD_VERSION/assert/assert_false.ts";
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*
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* assertFalse(false); // Doesn't throw
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* assertFalse(true); // Throws
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* ```
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*/
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export function assertFalse(expr: unknown, msg = ""): asserts expr is Falsy {
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if (expr) {
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throw new AssertionError(msg);
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}
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}
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