// Copyright 2018-2025 the Deno authors. MIT license.
// This module is browser compatible.
import { assertFalse } from "./false.ts";
/**
* Make an assertion that `obj` is not an instance of `type`.
* If so, then throw.
*
* @example Usage
* ```ts ignore
* import { assertNotInstanceOf } from "@std/assert";
*
* assertNotInstanceOf(new Date(), Number); // Doesn't throw
* assertNotInstanceOf(new Date(), Date); // Throws
* ```
*
* @typeParam A The type of the object to check.
* @typeParam T The type of the class to check against.
* @param actual The object to check.
* @param unexpectedType The class constructor to check against.
* @param msg The optional message to display if the assertion fails.
*/
export function assertNotInstanceOf<A, T>(
actual: A,
// deno-lint-ignore no-explicit-any
unexpectedType: abstract new (...args: any[]) => T,
msg?: string,
): asserts actual is Exclude<A, T> {
const msgSuffix = msg ? `: ${msg}` : ".";
msg =
`Expected object to not be an instance of "${typeof unexpectedType}"${msgSuffix}`;
assertFalse(actual instanceof unexpectedType, msg);
}
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