Method get

core_js/utils/Multimap.js:43–51

(key)

        return this._size;
    }
    get(key) {
        const values = this._map.get(key);
        if (values) {
            return new Set(values);
        }
        else {
            return new Set();
        }
    }
    put(key, value) {
        let values = this._map.get(key);
        if (!values) {