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std/assert/assert_false.ts

Deno standard library
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.import { AssertionError } from "./assertion_error.ts";
type Falsy = false | 0 | 0n | "" | null | undefined;
/** Make an assertion, error will be thrown if `expr` have truthy value. */export function assertFalse(expr: unknown, msg = ""): asserts expr is Falsy { if (expr) { throw new AssertionError(msg); }}