22 lines
591 B
TypeScript
22 lines
591 B
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
|
|
// This module is browser compatible.
|
|
import { AssertionError } from "./assertion_error.ts";
|
|
|
|
/**
|
|
* Use this to assert unreachable code.
|
|
*
|
|
* @example Usage
|
|
* ```ts ignore
|
|
* import { unreachable } from "@std/assert";
|
|
*
|
|
* unreachable(); // Throws
|
|
* ```
|
|
*
|
|
* @param msg Optional message to include in the error.
|
|
* @returns Never returns, always throws.
|
|
*/
|
|
export function unreachable(msg?: string): never {
|
|
const msgSuffix = msg ? `: ${msg}` : ".";
|
|
throw new AssertionError(`Unreachable${msgSuffix}`);
|
|
}
|