Clear and concise description of the problem

Generating .d.ts for every entry (e.g. hundreds of icons) is unnecessary and slows the build. tsconfig exclude does not help when those files are still listed as entry points.

Suggested solution

Add a way to skip declaration emit for paths matching globs

import { defineConfig } from 'tsdown'
export default defineConfig({
  entry: ['src/**/*.ts', 'src/Icon/Icons/**/index.js'],
  outDir: 'lib',
  unbundle: true,
  root: 'src',
  dts: {
    tsconfig: 'tsconfig.build.json',
    resolver: 'oxc',
    exclude: ['src/Icon/Icons/**'], // <- this add
  },
})

This would mirror the ergonomics of vite-plugin-dts, which supports include / exclude on the plugin options.

Alternative

Split into two configs: one with dts: { ... }, one with dts: false for the same entries subset.

Additional context

No response

Validations

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• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.