feat: apply inlineOnly option for dts files

Author: sxzz

src/features/external.ts

@@ -2,7 +2,7 @@ import { isBuiltin } from 'node:module'
 import path from 'node:path'
 import { blue, underline } from 'ansis'
 import { createDebug } from 'obug'
-import { RE_DTS, RE_NODE_MODULES } from 'rolldown-plugin-dts/filename'
+import { RE_NODE_MODULES } from 'rolldown-plugin-dts/filename'
 import { and, id, importerId, include } from 'rolldown/filter'
 import { matchPattern, typeAssert } from '../utils/general.ts'
 import { shimFile } from './shims.ts'
@@ -48,9 +48,7 @@ export function ExternalPlugin({
 
         if (
           inlineOnly &&
-          !RE_DTS.test(importer) && // skip dts files
           !nodeBuiltinModule && // skip node built-in modules
-          id[0] !== '.' && // skip relative imports
           !path.isAbsolute(id) // skip absolute imports
         ) {
           const shouldInline =

tsdown.config.ts

@@ -9,7 +9,11 @@ export default defineConfig([
   {
     entry: ['./src/{index,run,plugins,config}.ts'],
     name: 'tsdown',
-    inlineOnly: ['is-in-ci'],
+    inlineOnly: [
+      'is-in-ci',
+      'pkg-types', // type-only
+      'exsolve', // type-only, removed after tree-shaking
+    ],
     platform: 'node',
     failOnWarn: 'ci-only',
     define: {