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21 lines
569 B
TypeScript
21 lines
569 B
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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import { AssertionError } from "./assertion_error.ts";
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/**
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* Use this to assert unreachable code.
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*
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* @example Usage
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* ```ts no-eval
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* import { unreachable } from "@std/assert/unreachable";
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*
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* unreachable(); // Throws
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* ```
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*
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* @param reason The reason why the code should be unreachable.
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* @returns Never returns, always throws.
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*/
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export function unreachable(reason?: string): never {
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throw new AssertionError(reason ?? "unreachable");
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}
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