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os = require(\"os\");\nconst fs = require(\"fs\");\nconst path = require(\"path\");\nconst ARSON = require(\"arson\");\nconst {fork} = require(\"child_process\");\nconst dargs = require(\"dargs\");\nconst Observable = require(\"zen-observable\");\nconst MemoryFilesystem = require(\"memory-fs\");\nconst crypto = require(\"crypto\");\nconst debug = require(\"util\").debuglog(\"PATTERNPLATE\");\nconst resolvePkg = require(\"resolve-pkg\");\n\nconst OPTS = { stdio: [\"pipe\", \"pipe\", \"pipe\", \"ipc\"] };\n\nmodule.exports.createCompiler = async function createCompiler({ config, cwd, target = \"\" }) {\n let worker;\n\n const send = payload => {\n if (!worker || !worker.send || !worker.connected) {\n return;\n }\n worker.send(ARSON.stringify(payload));\n }\n\n let watching = false;\n\n const queue = [];\n let listeners = [];\n\n const next = (message) => listeners.forEach(listener => listener.next(message));\n\n const start = () => {\n const workerPath = path.join(__dirname, \"compiler-worker.js\");\n debug(`starting compiler worker at ${workerPath}`);\n const cp = fork(workerPath, dargs({cwd, target, config: ARSON.stringify(config)}), OPTS);\n\n let stderr = ``;\n let stdout = ``;\n\n cp.stdout.pipe(process.stdout);\n cp.stderr.pipe(process.stderr);\n\n cp.once(\"close\", (code) => {\n if (code !== 0) {\n queue.unshift({type: \"exception\", payload: {\n code,\n stdout,\n stderr: [`Could not start compiler worker for \"${target}\"`, stderr].join(\"\\n\")\n }});\n next(queue);\n }\n });\n\n return cp;\n };\n\n worker = start();\n\n setInterval(() => send({type: \"heartbeat\"}), 500);\n\n const onMessage = envelope => {\n const {type, target, payload} = ARSON.parse(envelope);\n\n switch (type) {\n case \"ready\": {\n return send({type: \"start\"});\n }\n case \"done\": {\n debug({type, target});\n const fs = new MemoryFilesystem(payload);\n queue.unshift({type, target, payload: {fs}});\n return next(queue);\n }\n case \"start\": {\n debug({type, target});\n queue.unshift({type, target, payload});\n return next(queue);\n }\n case \"error\": {\n if (Array.isArray(payload)) {\n return payload.forEach(p => console.error(p.message))\n }\n return console.error(payload.message);\n }\n case \"shutdown\": {\n debug({type, target});\n send({type: \"stop\"});\n\n worker = start();\n\n worker.on(\"message\", onMessage);\n\n if (watching) {\n send({type: \"watch\"});\n }\n }\n }\n };\n\n worker.on(\"message\", onMessage);\n\n const observable = new Observable(observer => {\n if (!watching) {\n watching = true;\n send({type: \"watch\"});\n }\n\n listeners.push(observer);\n return () => {\n listeners = listeners.filter(listener => listener !== observer);\n }\n });\n\n observable.queue = queue;\n observable.stop = () => {\n send({type: \"stop\"});\n }\n return observable;\n}\n"]} |