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std/_util/assert.ts

Deno standard library
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
export class DenoStdInternalError extends Error { constructor(message: string) { super(message); this.name = "DenoStdInternalError"; }}
/** Make an assertion, if not `true`, then throw. */export function assert(expr: unknown, msg = ""): asserts expr { if (!expr) { throw new DenoStdInternalError(msg); }}