From 5a8ff00e388851949918ee24d19e32b3d5c3a643 Mon Sep 17 00:00:00 2001
From: ckohen <chaikohen@gmail.com>
Date: Thu, 16 Nov 2023 00:27:25 -0800
Subject: [PATCH 1/2] fix(dts): ensure chunks conform to bundle format

---
 src/rollup.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/rollup.ts b/src/rollup.ts
index 35fdea1e1..be82f5d83 100644
--- a/src/rollup.ts
+++ b/src/rollup.ts
@@ -207,6 +207,7 @@ const getRollupConfig = async (
         banner: dtsOptions.banner,
         footer: dtsOptions.footer,
         entryFileNames: `[name]${outputExtension}`,
+        chunkFileNames: `[name]-[hash]${outputExtension}`,
         plugins: [
           format === 'cjs' && options.cjsInterop && fixCjsExport,
         ].filter(Boolean),

From ebfd61232bc8292fdbd098d7630fa6c78afeb46e Mon Sep 17 00:00:00 2001
From: ckohen <chaikohen@gmail.com>
Date: Fri, 17 Nov 2023 17:28:50 -0800
Subject: [PATCH 2/2] test: add tests for dts chunks

---
 test/index.test.ts | 87 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/test/index.test.ts b/test/index.test.ts
index 0228d643a..63254fefd 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -1375,6 +1375,93 @@ test('should emit a declaration file per format (type: module)', async () => {
   ])
 })
 
+test('should emit dts chunks per format', async () => {
+  const { outFiles } = await run(
+    getTestName(),
+    {
+      'src/input1.ts': `
+          import type { InternalType } from './shared.js'
+
+          export function getValue(value: InternalType) {
+            return value;
+          }
+      `,
+      'src/input2.ts': `
+          import type { InternalType } from './shared.js'
+
+          export function getValue(value: InternalType) {
+            return value;
+          }
+      `,
+      'src/shared.ts': `export type InternalType = 'foo'`,
+      'tsup.config.ts': `
+        export default {
+          entry: ['./src/input1.ts', './src/input2.ts'],
+          format: ['esm', 'cjs'],
+          dts: true
+        }`,
+    },
+    { entry: [] }
+  )
+  expect(outFiles).toEqual([
+    'input1.d.mts',
+    'input1.d.ts',
+    'input1.js',
+    'input1.mjs',
+    'input2.d.mts',
+    'input2.d.ts',
+    'input2.js',
+    'input2.mjs',
+    'shared-qBqaX8Tr.d.mts',
+    'shared-qBqaX8Tr.d.ts',
+  ])
+})
+
+test('should emit dts chunks per format (type: module)', async () => {
+  const { outFiles } = await run(
+    getTestName(),
+    {
+      'src/input1.ts': `
+          import type { InternalType } from './shared.js'
+
+          export function getValue(value: InternalType) {
+            return value;
+          }
+      `,
+      'src/input2.ts': `
+          import type { InternalType } from './shared.js'
+
+          export function getValue(value: InternalType) {
+            return value;
+          }
+      `,
+      'src/shared.ts': `export type InternalType = 'foo'`,
+      'tsup.config.ts': `
+        export default {
+          entry: ['./src/input1.ts', './src/input2.ts'],
+          format: ['esm', 'cjs'],
+          dts: true
+        }`,
+      'package.json': `{
+          "type": "module"
+        }`,
+    },
+    { entry: [] }
+  )
+  expect(outFiles).toEqual([
+    'input1.cjs',
+    'input1.d.cts',
+    'input1.d.ts',
+    'input1.js',
+    'input2.cjs',
+    'input2.d.cts',
+    'input2.d.ts',
+    'input2.js',
+    'shared-qBqaX8Tr.d.cts',
+    'shared-qBqaX8Tr.d.ts',
+  ])
+})
+
 test('should emit declaration files with experimentalDts', async () => {
   const files = {
     'package.json': `