Created
November 5, 2021 01:05
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| const swc = require("@swc/core"); | |
| const { exec, spawn } = require("child_process"); | |
| const chokidar = require("chokidar"); | |
| const fs = require("fs"); | |
| const { dirname, basename } = require("path"); | |
| const DEBOUNCE_TIME_MS = 100; | |
| let options = { | |
| jsc: { | |
| parser: { | |
| syntax: "typescript", | |
| tsx: false, | |
| dynamicImport: true, | |
| }, | |
| target: "es5", | |
| }, | |
| module: { | |
| type: "commonjs", | |
| }, | |
| }; | |
| let rootOut = "./dist"; | |
| let entrypoint = "src/index.ts"; | |
| let run_point = `${rootOut}/${entrypoint}`; | |
| let appOut = `${rootOut}/${dirname(entrypoint)}`; | |
| const mkdir_force = dir => | |
| !fs.existsSync(dir) && fs.mkdirSync(dir, { recursive: true }); | |
| mkdir_force(appOut); | |
| let isWatch = () => process.argv.reduce((acc, curr) => acc || curr === "--watch", false) | |
| let firstPass = true; | |
| let program = { | |
| pid: null, | |
| } | |
| let restart = () => { | |
| if (program.pid != null) { | |
| process.kill(program.pid, "SIGTERM"); | |
| } | |
| console.log("\n===========================") | |
| console.log(firstPass ? "\t Running\t": "\t Restarting\t"); | |
| console.log("===========================\n") | |
| firstPass = false; | |
| let cmd = exec(`node ${run_point}`); | |
| cmd.stderr.on("data", data => process.stdout.write(data)); | |
| cmd.stdout.on("data", data => process.stdout.write(data)); | |
| cmd.on("exit", code => code != 0 && process.stdout.write(`\nNonzero Exit! ${code}\n`)); | |
| program.pid = cmd.pid; | |
| } | |
| let hotreloader = { | |
| debouncer: setTimeout(restart, DEBOUNCE_TIME_MS), | |
| program: null, | |
| } | |
| let hotreload = () => { | |
| if (!(firstPass || isWatch())) return; | |
| clearTimeout(hotreloader.debouncer) | |
| hotreloader.debouncer = setTimeout(restart, DEBOUNCE_TIME_MS) | |
| } | |
| let start = () => { | |
| chokidar.watch("./src/**/*.ts").on("all", (event, path) => { | |
| let res = swc.transformFileSync(path, options); | |
| let dist_path = dirname(path).split("/").slice(1).join("/"); | |
| mkdir_force(`${appOut}/${dist_path}`); | |
| fs.writeFileSync( | |
| `${appOut}/${dist_path}/${basename(path, ".ts")}.js`, | |
| res.code, | |
| ); | |
| hotreload(); | |
| }); | |
| } | |
| start(); |
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