test: add test

test/index.test.ts

@@ -1633,3 +1633,67 @@ test('should emit declaration files with experimentalDts', async () => {
   )
   expect(snapshots.sort().join('\n')).toMatchSnapshot()
 })
+
+test('should only include exported declarations with experimentalDts', async () => {
+  const files = {
+    'package.json': `
+        {
+          "name": "tsup-playground",
+          "private": true,
+          "version": "0.0.0",
+          "exports": {
+              "./entry1": {
+                  "types": "./dist/entry1.d.ts",
+                  "default": "./dist/entry1.js"
+              },
+              "./entry2": {
+                  "types": "./dist/entry2.d.ts",
+                  "default": "./dist/entry2.js"
+              }
+          }
+        }
+    `,
+    'tsconfig.json': `
+        {
+          "compilerOptions": {
+              "target": "ES2020",
+              "skipLibCheck": true,
+              "noEmit": true
+          },
+          "include": ["./src"]
+        }
+    `,
+    'tsup.config.ts': `
+        export default {
+          name: 'tsup',
+          entry: {
+            'entry1': './src/entry1.ts',
+            'entry2': './src/entry2.ts',
+          },
+        }
+    `,
+    'src/shared.ts': `
+        export const declare1 = 'declare1'
+        export const declare2 = 'declare2'
+    `,
+    'src/entry1.ts': `
+        export { declare1 } from './shared'
+    `,
+    'src/entry2.ts': `
+        export { declare2 } from './shared'
+    `,
+  }
+  const {  getFileContent } = await run(getTestName(), files, {
+    entry: [],
+    flags: ['--experimental-dts'],
+  })
+
+  let entry1dts = await getFileContent('dist/entry1.d.ts')
+  let entry2dts = await getFileContent('dist/entry2.d.ts')
+
+  expect(entry1dts).toContain('declare1')
+  expect(entry1dts).not.toContain('declare2')
+
+  expect(entry2dts).toContain('declare2')
+  expect(entry2dts).not.toContain('declare1')
+})