Target lib with ts components doesn't generate types

[gehringf]

Version

4.4.1

Reproduction link

https://github.com

Environment info

Environment Info:

  System:
    OS: macOS Mojave 10.14.6
    CPU: (8) x64 Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz
  Binaries:
    Node: 11.10.0 - /usr/local/bin/node
    Yarn: Not Found
    npm: 6.14.5 - /usr/local/bin/npm
  Browsers:
    Chrome: 83.0.4103.61
    Edge: Not Found
    Firefox: Not Found
    Safari: 12.1.2
  npmGlobalPackages:
    @vue/cli: 4.4.1

Steps to reproduce

• vue create projectxy
• Choose typescript
• Add typescript components with modern decorator syntax
• Add index.js which exports the components
• run vue-cli-service build --target lib

What is expected?

Export contains a ts file for the types of the components

What is actually happening?

Trying to consume the components in another vue project with ts doesn't work because the types are missing.

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I haven't been able to find out how big libraries are doing this right now? Are they manually writing the type declarations?