Command line options with confirm type prompt not parsed as boolean

Version

4.5.13

Reproduction link

https://github.com/Yleisradio/vue-cli-plugin-yddviz

Environment info

Environment Info:

  System:
    OS: Linux 5.4 Ubuntu 20.04.2 LTS (Focal Fossa)
    CPU: (4) x64 AMD Ryzen 3 PRO 3300U w/ Radeon Vega Mobile Gfx
  Binaries:
    Node: 16.4.0 - ~/.nvm/versions/node/v16.4.0/bin/node
    Yarn: 1.22.10 - ~/.nvm/versions/node/v16.4.0/bin/yarn
    npm: 7.18.1 - ~/.nvm/versions/node/v16.4.0/bin/npm
  Browsers:
    Chrome: Not Found
    Firefox: Not Found
  npmPackages:
    @vue/babel-helper-vue-jsx-merge-props:  1.2.1
    @vue/babel-helper-vue-transform-on:  1.0.2
    @vue/babel-plugin-jsx:  1.0.6
    @vue/babel-plugin-transform-vue-jsx:  1.2.1
    @vue/babel-preset-app:  4.5.13
    @vue/babel-preset-jsx:  1.2.4
    @vue/babel-sugar-composition-api-inject-h:  1.2.1
    @vue/babel-sugar-composition-api-render-instance:  1.2.4
    @vue/babel-sugar-functional-vue:  1.2.2
    @vue/babel-sugar-inject-h:  1.2.2
    @vue/babel-sugar-v-model:  1.2.3
    @vue/babel-sugar-v-on:  1.2.3
    @vue/cli-overlay:  4.5.13
    @vue/cli-plugin-babel: ~4.5.0 => 4.5.13
    @vue/cli-plugin-eslint: ~4.5.0 => 4.5.13
    @vue/cli-plugin-router:  4.5.13
    @vue/cli-plugin-vuex:  4.5.13
    @vue/cli-service: ~4.5.0 => 4.5.13
    @vue/cli-shared-utils:  4.5.13
    @vue/compiler-core:  3.1.3
    @vue/compiler-dom:  3.1.3
    @vue/compiler-sfc: ^3.0.0 => 3.1.3
    @vue/compiler-ssr:  3.1.3
    @vue/component-compiler-utils:  3.2.2
    @vue/preload-webpack-plugin:  1.1.2
    @vue/reactivity:  3.1.3
    @vue/runtime-core:  3.1.3
    @vue/runtime-dom:  3.1.3
    @vue/shared:  3.1.3
    @vue/web-component-wrapper:  1.3.0
    eslint-plugin-vue: ^7.0.0 => 7.12.1
    vue: ^3.0.0 => 3.1.3
    vue-cli-plugin-yddviz: ~4.3.2 => 4.3.2
    vue-eslint-parser:  7.7.1
    vue-hot-reload-api:  2.3.4
    vue-loader:  15.9.7 (16.3.0)
    vue-style-loader:  4.1.3
    vue-template-es2015-compiler:  1.9.1
  npmGlobalPackages:
    @vue/cli: Not Found

Steps to reproduce

Invoke the plugin for example like this: vue add yddviz --projectName test-project --externalContent true or vue add yddviz --projectName test-project --externalContent y

What is expected?

Since the externalContent option is of type confirm, it should be parsed as an boolean, in the same way as if you enter the prompts manually (by using just vue add yddviz). package.json in the vue project should include the following after invoking the plugin:

"yleDataviz": {
  "externalContent": true
}

What is actually happening?

The externalContent option is parsed like a string instead of a boolean.

"yleDataviz": {
  "externalContent": "true"
}

"yleDataviz": {
  "externalContent": "y"
}

vuejs / vue-cli