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19 lines
544 B
TypeScript
19 lines
544 B
TypeScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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import { AssertionError } from "./assertion_error.ts";
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/**
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* Make an assertion that actual is not null or undefined.
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* If not then throw.
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*/
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export function assertExists<T>(
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actual: T,
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msg?: string,
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): asserts actual is NonNullable<T> {
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if (actual === undefined || actual === null) {
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const msgSuffix = msg ? `: ${msg}` : ".";
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msg =
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`Expected actual: "${actual}" to not be null or undefined${msgSuffix}`;
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throw new AssertionError(msg);
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}
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}
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