I followed the vite documentation for using library mode and I am able to produce a working component library.
I created the project with the vue-ts preset and in my component I have defined props with their types, and used some interfaces. But when I build the library, there are no types included.

How do I add types for the final build, either inferred from components automatically or manually with definition files?

More information Here is some more information on my files:
tsconfig.json

{
  "name": "@mneelansh/test-lib",
  "private": false,
  "version": "0.0.2",
  "scripts": {
    "dev": "vite",
    "build": "vue-tsc --noEmit && vite build",
    "preview": "vite preview"
  },
  "emitDeclarationOnly": true, // testing
  "declaration": true, // testing
  "main": "./dist/lib.umd.js",
  "module": "./dist/lib.es.js",
  "types": "./dist/main.d.ts",
  "exports": {
    ".": {
      "import": "./dist/lib.es.js",
      "require": "./dist/lib.umd.js"
    },
    "./dist/style.css": "./dist/style.css"
  },
  "files": [
    "dist"
  ],
  "dependencies": {
    "@types/node": "^17.0.25",
    "vue": "^3.2.25"
  },
  "devDependencies": {
    "@vitejs/plugin-vue": "^2.3.1",
    "typescript": "^4.5.4",
    "vite": "^2.9.5",
    "vue-tsc": "^0.34.7"
  }
}

I added the emitDeclarationOnly and declaration properties but that didn't help.

My vite.config.ts:

import { defineConfig } from "vite";
import vue from "@vitejs/plugin-vue";

const path = require("path");

// https://vitejs.dev/config/
export default defineConfig({
  build: {
    lib: {
      entry: path.resolve(__dirname, "src/index.ts"),
      name: "Button",
      fileName: (format) => `lib.${format}.js`,
    },
    rollupOptions: {
      external: ["vue"],
      output: {
        globals: {
          vue: "Vue",
        },
      },
    },
  },
  plugins: [vue()],
});