Source map files not generated when exported on entry

[2wheeh]

Describe the bug

Source map files are not being generated in the following scenarios:

1. When the source file is the entry point.
2. When a file is exported from the entry point.

It can be reproduced with below code structure

// src/index.ts <- entry
export * from './foo'

// src/foo/index.ts
export { bar } from './bar'

// src/foo/bar.ts
export const bar = 'bar'

After building, I expected source map files generated for the .d.ts files as shown below

dist
  |_ foo
  |  |_index.d.ts
  |  |_index.d.ts.map
  |  |_bar.d.ts
  |  |_bar.d.ts.map
  |_index.d.ts
  |_index.d.ts.map
  |_ ...

but none of these 3 .d.ts files doesn't generate their corresponding source map files.

Here is the config that I used to reproduce, which is the one in reproduction link.

// vite.config.ts
import { defineConfig } from 'vite';
import react from '@vitejs/plugin-react';
import dts from 'vite-plugin-dts';
import { resolve } from 'node:path';

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    react(),
    dts({
      include: ['src'],
      insertTypesEntry: true,
      outDir: ['dist'],
      tsconfigPath: resolve(__dirname, 'tsconfig.json'),
      compilerOptions: {
        declaration: true,
        declarationMap: true,
      },
    }),
  ],
  build: {
    sourcemap: true,
    lib: {
      entry: resolve('src', 'index.ts'),
      name: 'my-lib',
      formats: ['es', 'cjs'],
      fileName: (format) => `index.${format === 'cjs' ? 'cjs' : 'es.js'}`,
    },
    rollupOptions: {
      external: ['react', 'react-dom'],
      output: {
        globals: {
          react: 'React',
          'react-dom': 'ReactDOM',
        },
      },
    },
  },
});

Reproduction

https://stackblitz.com/edit/vitejs-vite-z9j9ux?file=package.json

Steps to reproduce

1. Run vite build on terminal
2. Check dist directory

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 16.20.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 9.4.2 - /usr/local/bin/npm
    pnpm: 8.6.10 - /usr/local/bin/pnpm
  npmPackages:
    @vitejs/plugin-react: ^4.0.4 => 4.0.4 
    vite: ^4.4.8 => 4.4.8 
    vite-plugin-dts: ^3.5.1 => 3.5.1

Validations

• Read the FAQ.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.

[2wheeh]

I checked that it works till @3.3.1 and since @3.4.0 it hasn't generated declarationMap files.
it works on @3.3.1 => https://stackblitz.com/edit/vitejs-vite-qnchol?file=package.json

[olegKusov]

Same issue. it do not work even with 3.3.1 version