npm run serve error: You must pass the `"decoratorsLegacy": true` option to @babel/preset-stage-2

Version

3.0.0-beta.6

Reproduction link

https://codepen.io/

Steps to reproduce

• Vue CLI v3.0.0-beta.6
• ? Please pick a preset: Manually select features
• ? Check the features needed for your project: TS, Router, Vuex, CSS Pre-processors, Linter
• ? Use class-style component syntax? Yes
• ? Use Babel alongside TypeScript for auto-detected polyfills? Yes
• ? Pick a CSS pre-processor (PostCSS, Autoprefixer and CSS Modules are supported by default): LESS
• ? Pick a linter / formatter config: Airbnb
• ? Pick additional lint features:
• ? Where do you prefer placing config for Babel, PostCSS, ESLint, etc.? In dedicated config files
• ? Save this as a preset for future projects? No

vue-cli will install @babel/preset-stage-2@7.0.0-beta.45 and npm run serve will throw error:

The new decorators proposal is not supported yet. You must pass the “decoratorsLegacy”: true option to @babel/preset-stage-2

see: https://github.com/babel/babel/blob/master/packages/babel-preset-stage-2/src/index.js#L29

forgive my poor English

What is expected?

server success

What is actually happening?

The new decorators proposal is not supported yet. You must pass the "decoratorsLegacy": true option to @babel/preset-stage-2

[nitta-honoka]

I had solved the problem by using a custom config by @babel/preset-env in file .babelrc. Working well, like this:

{
  "presets": [
    ["@babel/preset-env", {
      "targets": {
        "browsers": [
          "> 5%",
          "last 2 versions",
          "not ie <= 8"
        ]
      },
      "modules": false,
      "exclude": [
        "transform-regenerator"
      ]
    }],
    ["@babel/preset-stage-2", {
      "useBuiltIns": true,
      "decoratorsLegacy": true
    }]
  ],
  "plugins": [
  ]
}

[ftgibran]

Guys while this issue is not fixed, simply use this temporary solution: Specify the old version of @babel/preset-stage-2 in devDependencies

// package.json
"devDependencies": {
  "@babel/preset-stage-2": "7.0.0-beta.44",
  ...
}

then run npm run install