Can not emit declaration files for TypeScript

Version

3.0.0-beta.6

Reproduction link

https://github.com/HuijiFE/void-ui/tree/0.1

Steps to reproduce

git clone [e-mail]:HuijiFE/void-ui.git
cd void-ui
git checkout 0.1
yarn
yarn build:void

What is expected?

Output declaration files after building.

What is actually happening?

There is not any declaration files after building.

---

I have set "declaration": true, in tsconfig.json, but it doesn’t output the typescript declaration files.

And then I use tsc --emitDeclarationOnly, although it output the declaration files but without vue single file component.

[Joehunk]

I just hit this issue myself. The solution for me was substantially similar to some of the previous ones claimed to work, but with some key differences. This is my vue.config.js:

module.exports = {
  chainWebpack: config => {
    // These are some necessary steps changing the default webpack config of the Vue CLI
    // that need to be changed in order for Typescript based components to generate their
    // declaration (.d.ts) files.
    //
    // Discussed here https://github.com/vuejs/vue-cli/issues/1081
    if(process.env.NODE_ENV === 'production') {
      config.module.rule("ts").uses.delete("cache-loader");

      config.module
        .rule('ts')
        .use('ts-loader')
        .loader('ts-loader')
        .tap(opts => {
          opts.transpileOnly = false;
          opts.happyPackMode = false;
          return opts;
        });
    }
  },
  parallel: false,
}

In particular, the section in previous examples that disabled thread-loader had no effect. I had to add parallel: false to avoid the error Cannot read property 'options' of undefined.

Additionally (this is obvious but bears mentioning), you must specify "declaration": true in your tsconfig.json to have declaration files emitted. This is with the latest (4.1.x) Vue CLI.

[wizardnet972]

Same here for library 😦 npx vue-cli-service build --target lib --dest lib ./src/index.ts

I have set “declaration”: true, in tsconfig.json, but it doesn’t output the typescript declaration files.