styleChunkName() {
        // If the user set extractStyles: true, we'll try
        // to append the React styles to an existing CSS chunk.
        if (this.options.extractStyles === true) {
            let chunk = this.context.chunks.find((chunk, id) => id.startsWith('styles-'));

            if (chunk) {
                return chunk.name;
            }
        }

        return this.extractFile().relativePathWithoutExtension();
    }
Get the name of the style chunk.

@returns {string}