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Based on https://github.com/webpack-contrib/webpack-hot-middleware/blob/9708d781ae0e46179cf8ea1a94719de4679aaf53/middleware.js\n// Included License below\n\n// Copyright JS Foundation and other contributors\n\n// Permission is hereby granted, free of charge, to any person obtaining\n// a copy of this software and associated documentation files (the\n// 'Software'), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to\n// permit persons to whom the Software is furnished to do so, subject to\n// the following conditions:\n\n// The above copyright notice and this permission notice shall be\n// included in all copies or substantial portions of the Software.\n\n// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,\n// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.\n// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY\n// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,\n// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE\n// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\nimport { webpack } from 'next/dist/compiled/webpack/webpack'\nimport http from 'http'\n\nexport class WebpackHotMiddleware {\n eventStream: EventStream\n latestStats: webpack.Stats | null\n clientLatestStats: webpack.Stats | null\n closed: boolean\n serverError: boolean\n\n constructor(compilers: webpack.Compiler[]) {\n this.eventStream = new EventStream()\n this.latestStats = null\n this.clientLatestStats = null\n this.serverError = false\n this.closed = false\n\n compilers[0].hooks.invalid.tap(\n 'webpack-hot-middleware',\n this.onClientInvalid\n )\n compilers[0].hooks.done.tap('webpack-hot-middleware', this.onClientDone)\n\n compilers[1].hooks.invalid.tap(\n 'webpack-hot-middleware',\n this.onServerInvalid\n )\n compilers[1].hooks.done.tap('webpack-hot-middleware', this.onServerDone)\n }\n\n onServerInvalid = () => {\n if (!this.serverError) return\n\n this.serverError = false\n\n if (this.clientLatestStats) {\n this.latestStats = this.clientLatestStats\n this.publishStats('built', this.latestStats)\n }\n }\n onClientInvalid = () => {\n if (this.closed || this.serverError) return\n this.latestStats = null\n this.eventStream.publish({ action: 'building' })\n }\n onServerDone = (statsResult: webpack.Stats) => {\n if (this.closed) return\n // Keep hold of latest stats so they can be propagated to new clients\n // this.latestStats = statsResult\n // this.publishStats('built', this.latestStats)\n this.serverError = statsResult.hasErrors()\n\n if (this.serverError) {\n this.latestStats = statsResult\n this.publishStats('built', this.latestStats)\n }\n }\n onClientDone = (statsResult: webpack.Stats) => {\n this.clientLatestStats = statsResult\n\n if (this.closed || this.serverError) return\n // Keep hold of latest stats so they can be propagated to new clients\n this.latestStats = statsResult\n this.publishStats('built', this.latestStats)\n }\n middleware = (\n req: http.IncomingMessage,\n res: http.ServerResponse,\n next: () => void\n ) => {\n if (this.closed) return next()\n if (!req.url?.startsWith('/_next/webpack-hmr')) return next()\n this.eventStream.handler(req, res)\n if (this.latestStats) {\n // Explicitly not passing in `log` fn as we don't want to log again on\n // the server\n this.publishStats('sync', this.latestStats)\n }\n }\n\n publishStats = (action: string, statsResult: webpack.Stats) => {\n const stats = statsResult.toJson({\n all: false,\n hash: true,\n warnings: true,\n errors: true,\n })\n\n this.eventStream.publish({\n action: action,\n hash: stats.hash,\n warnings: stats.warnings || [],\n errors: stats.errors || [],\n })\n }\n\n publish = (payload: any) => {\n if (this.closed) return\n this.eventStream.publish(payload)\n }\n close = () => {\n if (this.closed) return\n // Can't remove compiler plugins, so we just set a flag and noop if closed\n // https://github.com/webpack/tapable/issues/32#issuecomment-350644466\n this.closed = true\n this.eventStream.close()\n }\n}\n\nclass EventStream {\n clients: Set<http.ServerResponse>\n interval: NodeJS.Timeout\n constructor() {\n this.clients = new Set()\n\n this.interval = setInterval(this.heartbeatTick, 2500).unref()\n }\n\n heartbeatTick = () => {\n this.everyClient((client) => {\n client.write('data: \\uD83D\\uDC93\\n\\n')\n })\n }\n\n everyClient(fn: (client: http.ServerResponse) => void) {\n for (const client of this.clients) {\n fn(client)\n }\n }\n\n close() {\n clearInterval(this.interval)\n this.everyClient((client) => {\n if (!client.finished) client.end()\n })\n this.clients.clear()\n }\n\n handler(req: http.IncomingMessage, res: http.ServerResponse) {\n const headers = {\n 'Access-Control-Allow-Origin': '*',\n 'Content-Type': 'text/event-stream;charset=utf-8',\n 'Cache-Control': 'no-cache, no-transform',\n // While behind nginx, event stream should not be buffered:\n // http://nginx.org/docs/http/ngx_http_proxy_module.html#proxy_buffering\n 'X-Accel-Buffering': 'no',\n }\n\n const isHttp1 = !(parseInt(req.httpVersion) >= 2)\n if (isHttp1) {\n req.socket.setKeepAlive(true)\n Object.assign(headers, {\n Connection: 'keep-alive',\n })\n }\n\n res.writeHead(200, headers)\n res.write('\\n')\n this.clients.add(res)\n req.on('close', () => {\n if (!res.finished) res.end()\n this.clients.delete(res)\n })\n }\n\n publish(payload: any) {\n this.everyClient((client) => {\n client.write('data: ' + JSON.stringify(payload) + '\\n\\n')\n })\n }\n}\n"]} |