module.exports = function fn(opts) {
const defaults = { dev: {}, hot: {} };
const options = Object.assign(defaults, opts);
let { compiler, config } = options;
if (!compiler) {
if (!config) {
// eslint-disable-next-line import/no-dynamic-require, global-require
config = require(path.join(root.path, 'webpack.config.js'));
}
compiler = Webpack(config);
}
if (!options.dev.publicPath) {
const { publicPath } = compiler.options.output;
if (!publicPath) {
throw new Error('koa-webpack: publicPath must be set on `dev` options, or in a compiler\'s `output` configuration.');
}
options.dev.publicPath = publicPath;
}
const client = options.hot ? hotClient(compiler, options.hot) : null;
const dev = devMiddleware(compiler, options.dev);
return Object.assign(koaDevware(dev, compiler), {
dev,
client,
close(callback) {
const next = client ? () => { client.close(callback); } : callback;
dev.close(next);
}
});
};
return new Promise((resolve) => {
const client = hotClient(compiler, options.hotClient);
const { server } = client;
server.on('listening', () => resolve(client));
});