[plugin-legacy] Manifest.json missing index-legacy.js

[andrefelipe]

Describe the bug

index-legacy.js is missing from manifest.json.

It does get generated correctly, it's just not within the manifest.json.

Reproduction

Can reproduce on a blank new Vite project, nothing special:

package.json:

{
  "name": "test",
  "version": "0.0.0",
  "scripts": {
    "dev": "vite",
    "build": "vite build"
  },
  "dependencies": {
    "vue": "^3.0.5"
  },
  "devDependencies": {
    "@vitejs/plugin-legacy": "^1.2.1",
    "@vitejs/plugin-vue": "^1.0.5",
    "@vue/compiler-sfc": "^3.0.5",
    "vite": "^2.0.0-beta.29"
  }
}

vite.config.js:

import vue from '@vitejs/plugin-vue'
import legacy from '@vitejs/plugin-legacy'

export default {
  plugins: [
    vue(),
    legacy({
      targets: ['defaults', 'not IE 11']
    })
  ],
  build: {
    manifest: true
  }
}

The manifest.json was this:

{
  "index.js": {
    "file": "assets/index.7eb20207.js",
    "imports": []
  },
  "polyfills-legacy.js": {
    "file": "assets/polyfills-legacy.8debf5e6.js",
    "imports": []
  },
  "logo.png": {
    "file": "assets/logo.3b714202.png"
  },
  "index.css": {
    "file": "assets/index.e2206225.css"
  }
}

System Info

• vite version: please see above
• Operating System: MacOS
• Node version: 15.5.0
• Package manager (npm/yarn/pnpm) and version: NPM 7.3.0