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22 lines
592 B
TypeScript
22 lines
592 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";
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*
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* unreachable(); // Throws
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* ```
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*
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* @param msg Optional message to include in the error.
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* @returns Never returns, always throws.
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*/
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export function unreachable(msg?: string): never {
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const msgSuffix = msg ? `: ${msg}` : ".";
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throw new AssertionError(`Unreachable${msgSuffix}`);
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}
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