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Path = require(\"path\");\nconst ARSON = require(\"arson\");\nconst { validate } = require(\"@patternplate/validate-config\");\nconst WebSocket = require(\"ws\");\nconst { loadConfig } = require(\"@patternplate/load-config\");\n\nconst { createCompiler } = require(\"./create-compiler\");\n\nconst debug = require(\"util\").debuglog(\"PATTERNPLATE\");\n\nmodule.exports.createSubscription = function createSubscription(context) {\n const { queues, config, cwd, wss, watcher } = context;\n\n return handler => {\n debug(\"subscribing to webpack and fs events\");\n\n // Prevent client errors (frequently caused by Chrome disconnecting on reload)\n // from bubbling up and making the server fail, ref: https://github.com/websockets/ws/issues/1256\n wss.on(\"connection\", ws => {\n ws.on(\"error\", err => {\n if (err.errno === \"ECONNRESET\") {\n return;\n }\n console.error(err);\n });\n });\n\n const send = getSender(wss, handler);\n\n queues.client.subscribe(queue => {\n const [message] = queue;\n send({ type: message.type, payload: message.payload });\n });\n\n queues.client.subscribe(queue => {\n const [message] = queue;\n send({ type: message.type, payload: message.payload });\n });\n\n let configError = false;\n\n watcher.subscribe(message => {\n if (\n message.type === \"change\" &&\n message.payload.contentType === \"config\"\n ) {\n (async () => {\n const { config: loadedConfig, filepath } = await loadConfig({ cwd });\n const [error] = validate({ target: config, name: filepath });\n\n if (error) {\n configError = true;\n send({ type: \"error\", payload: error });\n return;\n }\n\n if (configError) {\n console.log(`Resolved config error, applying ${filepath}`);\n configError = false;\n }\n\n Object.assign(config, loadedConfig);\n\n queues.client.stop();\n queues.server.stop();\n\n const [clientQueue, serverQueue] = await Promise.all([\n createCompiler({ config, cwd, target: \"web\" }),\n createCompiler({ config, cwd, target: \"node\" })\n ]);\n\n queues.client = clientQueue;\n queues.server = serverQueue;\n })().catch(err => {\n configError = true;\n send({ type: \"error\", payload: err });\n });\n }\n\n send(message);\n });\n };\n};\n\nfunction getSender(wss, handler) {\n return message => {\n if (typeof handler === \"function\") {\n handler(message);\n }\n wss.clients.forEach(client => {\n if (client.readyState === WebSocket.OPEN) {\n client.send(ARSON.stringify(message));\n }\n });\n };\n}\n"]} |