26 lines
854 B
TypeScript
26 lines
854 B
TypeScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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/**
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* All internal non-test code, that is files that do not have `test` or `bench` in the name, must use the assertion functions within `_utils/asserts.ts` and not `testing/asserts.ts`. This is to create a separation of concerns between internal and testing assertions.
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*/
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export class DenoStdInternalError extends Error {
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constructor(message: string) {
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super(message);
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this.name = "DenoStdInternalError";
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}
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}
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/** Make an assertion, if not `true`, then throw. */
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export function assert(expr: unknown, msg = ""): asserts expr {
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if (!expr) {
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throw new DenoStdInternalError(msg);
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}
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}
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/** Use this to assert unreachable code. */
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export function unreachable(): never {
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throw new DenoStdInternalError("unreachable");
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}
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