@woosh/meep-engine/src/core/debug/matchers/IsUndefined.js

Pure JavaScript game engine. Fully featured and production ready.

import { BaseMatcher } from "../BaseMatcher.js";

export class IsUndefined extends BaseMatcher {
    matches(item, mismatch_description) {
        return item === undefined;
    }

    describeTo(description) {
        description.appendText("undefined");
    }
}