🚀 feat(cli-wrapper.ts): add wrapper for CLI entrypoint to enable rest…

…artable process

The `cli-wrapper.ts` file is added to wrap the CLI entrypoint in a restartable process. This is done to enable the application to be restarted without having to manually stop and start the process. The wrapper is only enabled for the `nuxt dev` command. The wrapper starts a subprocess and listens for messages from the child process. If the child process sends a `nuxt:restart` message, the subprocess is killed and a new subprocess is started.

bin/nyxbi.mjs

@@ -1,2 +1,2 @@
 #!/usr/bin/env node
-import('../dist/cli-run.mjs')
+import('../dist/cli-wrapper.mjs')

src/cli-wrapper.ts

@@ -0,0 +1,47 @@
+/**
+ * This file is used to wrap the CLI entrypoint in a restartable process.
+ */
+import { fileURLToPath } from 'node:url'
+import { fork } from 'node:child_process'
+import type { ChildProcess } from 'node:child_process'
+
+const cliEntry = new URL('../dist/cli-run.mjs', import.meta.url)
+
+// Only enable wrapper for nuxt dev command
+if (process.argv[2] === 'dev') {
+   process.env.__CLI_ARGV__ = JSON.stringify(process.argv)
+   startSubprocess()
+}
+else {
+   import(cliEntry.href)
+}
+
+function startSubprocess() {
+   let childProc: ChildProcess | undefined
+
+   const onShutdown = () => {
+      if (childProc) {
+         childProc.kill()
+         childProc = undefined
+      }
+   }
+
+   process.on('exit', onShutdown)
+   process.on('SIGTERM', onShutdown) // Graceful shutdown
+   process.on('SIGINT', onShutdown) // Ctrl-C
+   process.on('SIGQUIT', onShutdown) // Ctrl-\
+
+   start()
+
+   function start() {
+      childProc = fork(fileURLToPath(cliEntry))
+      // eslint-disable-next-line curly
+      childProc.on('close', (code) => { if (code) { process.exit(code) } })
+      childProc.on('message', (message) => {
+         if ((message as { type: string })?.type === 'nuxt:restart') {
+            childProc?.kill()
+            startSubprocess()
+         }
+      })
+   }
+}