Lib mode doesn't export types

Describe the bug

I’m using vitejs to build a react typescript library, I started building it with a plain rollup, but decided to migrate, so I have put everything accordingly. Fixed some bugs, added some packages, but when I export it, it doesn’t export the typings (.d.ts) along with the es and umd files, even if I set declarations to true inside of the tsconfig. But it does export successfully both files.

I tried tweaking rollup but to no avail, and also couldn’t find anything related to this in the issues or google at all.

Reproduction

Install vite with the “react-ts” template, follow the documentation steps to use lib mode, make a simple component and export it from the output file, and build it.

System Info

Output of npx envinfo --system --npmPackages vite,@vitejs/plugin-vue --binaries --browsers:

  System:
    OS: Windows 10 10.0.18363
    CPU: (8) x64 Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
    Memory: 10.24 GB / 15.96 GB
  Binaries:
    Node: 14.3.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.14.0 - D:\programas\laragon\bin\yarn\bin\yarn.CMD
    npm: 5.7.1 - ~\node_modules\.bin\npm.CMD
  Browsers:
    Chrome: 89.0.4389.128
    Edge: Spartan (44.18362.1474.0)
    Internet Explorer: 11.0.18362.1

Used package manager: yarn

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[moljac024]

I understand the reasoning behind not doing this but I think it should be reconsidered. If Vite did this by default it would be a sort of pit of success that would benefit the broader JS/TS community. If it’s not the default and people start using Vite to build libraries I imagine we will have lots of them published without types. That in turn will lead to a lot of churn and lots of github issues being created (in the respective libraries).

[axelthat]

You can use https://github.com/egoist/tsup.

Example usage,

{
    "scripts": {
        "build": "tsup index.ts --format esm,cjs,iife --dts --minify"
    }
}

The --dts flag generates the types automatically.