Method add

tests/unit/utils/state-manager.tests.ts:12–24

(promises: Promise<void> | Array<Promise<void>>)

    }

    add(promises: Promise<void> | Array<Promise<void>>) {
        if (!Array.isArray(promises)) {
            promises = [promises];
        }
        promises.forEach((promise) => {
            if (this.promises.has(promise)) {
                throw new Error('Already added');
            }
            this.promises.set(promise, 'pending');
            promise.then(() => this.promises.set(promise, 'resolved'))
                .catch(() => this.promises.set(promise, 'rejected'));
        });
    }

    clear() {
        this.promises.clear();