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24 lines
730 B
TypeScript
24 lines
730 B
TypeScript
// Copyright 2025 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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export class AssertionError extends TypeError {
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override name = 'AssertionError';
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}
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export function assert(condition: boolean, message?: string): asserts condition;
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export function assert<T>(input: T, message?: string): NonNullable<T>;
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export function assert<T>(input: T, message?: string): NonNullable<T> {
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if (input === false || input == null) {
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// eslint-disable-next-line no-debugger
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debugger;
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throw new AssertionError(message ?? `input is ${input}`);
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}
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return input;
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}
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export function unreachable(_value: never): never {
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// eslint-disable-next-line no-debugger
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debugger;
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throw new AssertionError('unreachable');
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}
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