fix(vite-lib-config)!: migrate to vite 8 and its consumers to match

packages/example-cli/package.json

@@ -43,7 +43,7 @@
     "cpy-cli": "^7.0.0",
     "rimraf": "^6.0.1",
     "typescript": "~7.0.2",
-    "vite": "^7.1.9",
+    "vite": "^8.0.0",
     "vitest": "^4.1.0",
     "xsea": "^0.1.1"
   },

packages/example-lib/package.json

@@ -38,7 +38,7 @@
     "cpy-cli": "^7.0.0",
     "rimraf": "^6.0.1",
     "typescript": "~7.0.2",
-    "vite": "^7.1.9",
+    "vite": "^8.0.0",
     "vitest": "^4.1.0"
   },
   "engines": {

packages/sea-builder/CHANGELOG.md

@@ -28,6 +28,7 @@ project adheres to
   dropping Node.js 20, Node.js 22 below 22.23.1, Node.js 24 below
   24.2.0, and every Node.js 25 release; bumped pnpm to v11 (#88).
 - Bumped the `typescript` devDependency to `~6.0.3` (#113).
+- Bumped the `vite` devDependency to `^8.0.0` (#121).
 
 ### Fixed
 

packages/sea-builder/package.json

@@ -54,7 +54,7 @@
     "rimraf": "^6.0.1",
     "type-fest": "^5.0.1",
     "typescript": "~7.0.2",
-    "vite": "^7.1.9",
+    "vite": "^8.0.0",
     "vitest": "^4.1.0"
   },
   "peerDependencies": {

packages/vite-lib-config/CHANGELOG.md

@@ -27,6 +27,15 @@ project adheres to
   emit syntax unsupported on Node.js 20, even when the build itself
   runs on a supported Node.js version (#88).
 - Bumped the `typescript` devDependency to `~6.0.3` (#113).
+- **Breaking:** bumped the `vite` dependency from `^7.1.9` to
+  `^8.0.0`, and `vite-plugin-dts` from `^4.5.4` to `^5.0.1`. Renamed
+  `build.rollupOptions` to `build.rolldownOptions` in the shared
+  `viteConfig`, matching Vite 8's Rolldown-based bundler, and removed
+  `build.rollupOptions.output.importAttributesKey` — Rolldown's
+  `OutputOptions` has no equivalent option, so downstream consumers of
+  the published `viteConfig()` that relied on it to control emitted
+  import-attribute syntax (`with { type: ... }` / `assert { type: ...
+  }`) must drop that reliance (#121).
 
 ### Fixed
 

packages/vite-lib-config/package.json

@@ -38,8 +38,8 @@
     "lodash-es": "^4.17.21",
     "shebang-regex": "^4.0.0",
     "type-fest": "^5.0.1",
-    "vite": "^7.1.9",
-    "vite-plugin-dts": "^4.5.4"
+    "vite": "^8.0.0",
+    "vite-plugin-dts": "^5.0.1"
   },
   "devDependencies": {
     "@kurone-kito/typescript-config": "workspace:^",

packages/vite-lib-config/src/vite.mts

@@ -37,12 +37,11 @@ const out = '[name].mjs';
 /** Static configuration for Vite builds. */
 const staticConfig = {
   build: {
-    rollupOptions: {
+    rolldownOptions: {
       output: {
         chunkFileNames: out,
         entryFileNames: out,
         format: 'es',
-        importAttributesKey: 'with',
       },
     },
     sourcemap: true,
@@ -74,7 +73,7 @@ const innerCreateConfig = (entries: readonly string[]): UserConfig => {
   const bin = entry.every((f) => shebangRegex.test(readFileSync(f, 'utf8')));
   return mergeConfig<UserConfig, UserConfig>(staticConfig, {
     build: {
-      rollupOptions: { input: entry },
+      rolldownOptions: { input: entry },
       ...(bin ? {} : { lib: { entry, formats: ['es'] } }),
     },
     plugins: bin ? [] : [dts({ exclude: ['**/*.spec.mts'] })],

packages/vite-lib-config/src/vite.spec.mts

@@ -1,6 +1,7 @@
-import { mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises';
+import { mkdir, mkdtemp, readFile, rm, writeFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
+import { fileURLToPath } from 'node:url';
 import { afterAll, beforeAll, describe, expect, it } from 'vitest';
 import { viteConfig } from './vite.mjs';
 
@@ -141,3 +142,21 @@ describe('viteConfig', () => {
 describe('srcDir', () => {
   it('exports srcDir constant', () => expect(srcDir).toBe('src'));
 });
+
+describe('build configuration source', () => {
+  // Vite's own `mergeConfig` bidirectionally aliases `build.rollupOptions`
+  // and `build.rolldownOptions` in its merged output (confirmed
+  // empirically), so a runtime-output assertion cannot distinguish which
+  // key this file declares -- both keys read back identically either way.
+  // Guard against reverting the rename by asserting on the source text
+  // itself instead.
+  it('declares build.rolldownOptions and drops importAttributesKey', async () => {
+    const source = await readFile(
+      fileURLToPath(new URL('./vite.mts', import.meta.url)),
+      'utf8',
+    );
+    expect(source).toContain('rolldownOptions');
+    expect(source).not.toContain('rollupOptions');
+    expect(source).not.toContain('importAttributesKey');
+  });
+});