fix(cli/dev): fixed bug of repeat restart server

affects: @varlet/cli

packages/varlet-cli/src/commands/dev.ts

@@ -1,38 +1,40 @@
-import chokidar from 'chokidar'
+import chokidar, { FSWatcher } from 'chokidar'
+import logger from '../shared/logger'
 import { createServer, ViteDevServer } from 'vite'
 import { ensureDirSync, pathExistsSync } from 'fs-extra'
 import { SRC_DIR, VARLET_CONFIG } from '../shared/constant'
 import { buildSiteEntry } from '../compiler/compileSiteEntry'
 import { getDevConfig } from '../config/vite.config'
 import { getVarletConfig } from '../config/varlet.config'
 import { merge } from 'lodash'
-import logger from '../shared/logger'
-
-let server: ViteDevServer | null
-
-function watchConfigFile(force: boolean | undefined) {
-  if (!pathExistsSync(VARLET_CONFIG)) {
-    return
-  }
 
-  const watcher = chokidar.watch(VARLET_CONFIG)
-  watcher.on('change', () => startServer(force))
-}
+let server: ViteDevServer
+let watcher: FSWatcher
 
 async function startServer(force: boolean | undefined) {
   const isRestart = Boolean(server)
   logger.info(`${isRestart ? 'Res' : 'S'}tarting server...`)
 
+  // close all instance
   server && (await server.close())
+  watcher && (await watcher.close())
 
+  // build all config
   await buildSiteEntry()
   const varletConfig = getVarletConfig()
   const devConfig = getDevConfig(varletConfig)
   const inlineConfig = merge(devConfig, force ? { server: { force: true } } : {})
+
+  // create all instance
   server = await createServer(inlineConfig)
   await server.listen()
   server.printUrls()
 
+  if (pathExistsSync(VARLET_CONFIG)) {
+    watcher = chokidar.watch(VARLET_CONFIG)
+    watcher.on('change', () => startServer(force))
+  }
+
   logger.info(`${isRestart ? 'Res' : 'S'}tart successfully!!!`)
 }
 
@@ -42,6 +44,4 @@ export async function dev(cmd: { force?: boolean }) {
   ensureDirSync(SRC_DIR)
 
   await startServer(cmd.force)
-
-  watchConfigFile(cmd.force)
 }