Trying to use my own internal library causes vue serve to 100% CPU

[kennydude]

Version

4.4.6

Reproduction link

https://github.com/kennydude/broken-vue

Environment info

Environment Info:

  System:
    OS: Linux 4.19 Ubuntu 20.04 LTS (Focal Fossa)
    CPU: (4) x64 AMD Ryzen 3 3200G with Radeon Vega Graphics
  Binaries:
    Node: 10.19.0 - /usr/bin/node
    Yarn: 1.22.4 - /usr/bin/yarn
    npm: 6.14.4 - /usr/bin/npm
  Browsers:
    Chrome: Not Found
    Firefox: Not Found
  npmPackages:
    @vue/babel-helper-vue-jsx-merge-props:  1.0.0
    @vue/babel-plugin-transform-vue-jsx:  1.1.2
    @vue/babel-preset-app:  4.4.6
    @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:  4.4.6
    @vue/cli-plugin-babel: ~4.4.0 => 4.4.6
    @vue/cli-plugin-eslint: ~4.4.0 => 4.4.6
    @vue/cli-plugin-router: ~4.4.0 => 4.4.6
    @vue/cli-plugin-vuex:  4.4.6
    @vue/cli-service: ~4.4.0 => 4.4.6
    @vue/cli-shared-utils:  4.4.6
    @vue/component-compiler-utils:  3.1.2
    @vue/preload-webpack-plugin:  1.1.1
    @vue/web-component-wrapper:  1.2.0
    eslint-plugin-vue: ^6.2.2 => 6.2.2
    svg-to-vue:  0.7.0
    vue: ^2.6.11 => 2.6.11
    vue-eslint-parser:  7.1.0
    vue-hot-reload-api:  2.3.4
    vue-i18n:  8.18.2
    vue-loader:  15.9.3
    vue-router: ^3.2.0 => 3.3.4
    vue-style-loader:  4.1.2
    vue-svg-loader:  0.16.0
    vue-template-compiler: ^2.6.11 => 2.6.11
    vue-template-es2015-compiler:  1.9.1
  npmGlobalPackages:
    @vue/cli: Not Found

Steps to reproduce

Yarn install everything. Run yarn serve. Use htop. Find out it's using 100% CPU. Kill nodejs.

Note using yarn build works perfectly

What is expected?

Yarn compiles and serves the sample application.

What is actually happening?

Yarn gets stuck, tries to import additional components out of the library (I didn't ask it to?) and then hits 100% CPU.

---

I don't know which part of Vue is causing this, if any so apologies in advance is this is nothing to do with Vue, or a fault with my package.

[haoqunjiang]

The linked repository is empty

[kennydude]

ah sorry, code is there now

[haoqunjiang]

There're errors in the FormControl component template.

v-else-if="type === 'textarea'" used on element <textarea> without corresponding v-if.
v-else-if="type !== 'slot'" used on element <input> without corresponding v-if.
v-else used on element <slot> without corresponding v-if. 

But when trying to report the compilation errors, because the file uses CRLF as the line ending, it ran into this bug: vuejs/vue#10547

[kennydude]

ah thanks. the joys of just moving to a windows machine messing up my line endings.