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denoland-deno/std/_util/assert.ts

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// Copyright 2018-2020 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);
}
}