Changing ESLint config through vue ui cause error

[oOBoomberOo]

Version

4.2.2

Reproduction link

https://github.com/oOBoomberOo/vue_ui_config_error

Environment info

 System:
    OS: Linux 5.3 elementary OS 5.1 Hera
    CPU: (4) x64 Intel(R) Core(TM) i3-4150 CPU @ 3.50GHz
  Binaries:
    Node: 13.7.0 - ~/.nvm/versions/node/v13.7.0/bin/node
    Yarn: Not Found
    npm: 6.13.6 - ~/.nvm/versions/node/v13.7.0/bin/npm
  Browsers:
    Chrome: Not Found
    Firefox: 72.0.2
  npmPackages:
    @vue/babel-helper-vue-jsx-merge-props:  1.0.0 
    @vue/babel-plugin-transform-vue-jsx:  1.1.2 
    @vue/babel-preset-app:  4.2.2 
    @vue/babel-preset-jsx:  1.1.2 
    @vue/babel-sugar-functional-vue:  1.1.2 
    @vue/babel-sugar-inject-h:  1.1.2 
    @vue/babel-sugar-v-model:  1.1.2 
    @vue/babel-sugar-v-on:  1.1.2 
    @vue/cli-overlay:  4.2.2 
    @vue/cli-plugin-babel: ~4.2.0 => 4.2.2 
    @vue/cli-plugin-eslint: ~4.2.0 => 4.2.2 
    @vue/cli-plugin-router:  4.2.2 
    @vue/cli-plugin-typescript: ~4.2.0 => 4.2.2 
    @vue/cli-plugin-vuex:  4.2.2 
    @vue/cli-service: ~4.2.0 => 4.2.2 
    @vue/cli-shared-utils:  4.2.2 
    @vue/component-compiler-utils:  3.1.1 
    @vue/eslint-config-airbnb: ^5.0.2 => 5.0.2 
    @vue/eslint-config-typescript: ^5.0.1 => 5.0.1 
    @vue/preload-webpack-plugin:  1.1.1 
    @vue/web-component-wrapper:  1.2.0 
    eslint-plugin-vue: ^6.1.2 => 6.1.2 
    typescript: ~3.7.5 => 3.7.5 
    vue: ^2.6.11 => 2.6.11 
    vue-class-component: ^7.2.2 => 7.2.2 
    vue-eslint-parser:  7.0.0 
    vue-hot-reload-api:  2.3.4 
    vue-loader:  15.8.3 
    vue-property-decorator: ^8.3.0 => 8.4.0 
    vue-style-loader:  4.1.2 
    vue-template-compiler: ^2.6.11 => 2.6.11 
    vue-template-es2015-compiler:  1.9.1 
  npmGlobalPackages:
    @vue/cli: Not Found

Steps to reproduce

1. Open Vue UI
2. Create new Vue project with ES Lint option
3. Go to "Configuration" tab
4. Go to "ESLint" section
5. Select "Rules"
6. Change any config value to "Warning"
7. Serve/Build the project

What is expected?

Everything compiled normally and able to access the server via http://localhost:8080 url

What is actually happening?

Unable to compiled vue project with this error message:

Module build failed (from ./node_modules/eslint-loader/index.js):
Error: .eslintrc.js:
        Configuration for rule "vue/no-async-in-computed-properties" is invalid:
        Severity should be one of the following: 0 = off, 1 = warn, 2 = error (you passed '"warning"').