add(id, path, test, attrs = {}) {
        this.create(id, path, attrs).addTo(id, test);
    }
@param {string} id A unique identifier for this chunk. Multiple chunks with the same ID are merged.
@param {string} path The output path for this chunk
@param {ChunkTest|ChunkTest[]} test A test that tells webpack how to determine what to put in this chunk
@param {Partial<CacheGroup>} attrs