Dev server stops when there are errors in the config file

[sitek94]

Describe the bug

Development server stops working each time when you save the config file with a JavaScript error.

For example, if I save the following file, the development server stops and I need to restart it.

[ERROR] Expected "]" but found ":"

    www/.vitepress/config.ts:7:9:
      7 │     hello: ''
        │          ^
        ╵          ]

failed to load config from /Users/maciek/code/vitepress-demo/www/.vitepress/config.ts

failed to restart server. error:
Error: Build failed with 1 error:
www/.vitepress/config.ts:7:9: ERROR: Expected "]" but found ":"
    at failureErrorWithLog (/Users/maciek/code/vitepress-demo/node_modules/.pnpm/[email protected]/node_modules/esbuild/lib/main.js:1604:15)
    at /Users/maciek/code/vitepress-demo/node_modules/.pnpm/[email protected]/node_modules/esbuild/lib/main.js:1056:28
    at runOnEndCallbacks (/Users/maciek/code/vitepress-demo/node_modules/.pnpm/[email protected]/node_modules/esbuild/lib/main.js:1476:61)
    at buildResponseToResult (/Users/maciek/code/vitepress-demo/node_modules/.pnpm/[email protected]/node_modules/esbuild/lib/main.js:1054:7)
    at /Users/maciek/code/vitepress-demo/node_modules/.pnpm/[email protected]/node_modules/esbuild/lib/main.js:1166:14
    at responseCallbacks.<computed> (/Users/maciek/code/vitepress-demo/node_modules/.pnpm/[email protected]/node_modules/esbuild/lib/main.js:701:9)
    at handleIncomingPacket (/Users/maciek/code/vitepress-demo/node_modules/.pnpm/[email protected]/node_modules/esbuild/lib/main.js:756:9)
    at Socket.readFromStdout (/Users/maciek/code/vitepress-demo/node_modules/.pnpm/[email protected]/node_modules/esbuild/lib/main.js:677:7)
    at Socket.emit (node:events:513:28)
    at addChunk (node:internal/streams/readable:324:12)

Reproduction

https://stackblitz.com/edit/vite-zsaqar?file=docs%2F.vitepress%2Fconfig.ts

1. Start development server npm run docs:dev
2. Paste the following code to .vitepress/config.ts

   import {defineConfig} from 'vitepress'
   
   export default defineConfig({
     title: 'My website',
     description: `My website description`,
     items: [
       hello: ''
     ],
   })

3. Save the file
4. Dev server should stop working, and you should see an error in the console

Expected behavior

• development server shouldn't stop working
• latest valid config should be used
• maybe there should be an error overlay

System Info

System:
  OS: macOS 13.2.1
  CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  Memory: 198.12 MB / 32.00 GB
  Shell: 5.8.1 - /bin/zsh
Binaries:
  Node: 18.12.0 - ~/.nvm/versions/node/v18.12.0/bin/node
  Yarn: 1.22.19 - ~/.nvm/versions/node/v18.12.0/bin/yarn
  npm: 8.19.2 - ~/.nvm/versions/node/v18.12.0/bin/npm
Browsers:
  Brave Browser: 107.1.45.116
  Chrome: 110.0.5481.177
  Firefox: 110.0
  Safari: 16.3
npmPackages:
  vitepress: 1.0.0-alpha.49 => 1.0.0-alpha.49

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

[sitek94]

Thank you @yyx990803!

Btw. let me just say that this project is amazing and the design that we get out of the box is absolutely gorgeous!