Method add

Extension/src/Utility/Eventing/descriptor.ts:55–60

(key: string, ...values: string[])

    }

    add(key: string, ...values: string[]) {
        if (values.length) {
            const set = getOrAdd(this, smash(key), () => new Set<string>());
            values.forEach(each => set.add(each));
        }
    }
}