fix(pack): retain member directories when config loading is disabled

packages/cli/src/__tests__/pack.spec.ts

@@ -1,3 +1,8 @@
+import { existsSync, mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs';
+import { createRequire } from 'node:module';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+
 import { expect, test } from 'vitest';
 
 // `vite-plus/pack` re-exports the tsdown build bundled into core, so it must keep tsdown's runtime API.
@@ -8,3 +13,33 @@ test('exposes every tsdown value export from vite-plus/pack', async () => {
   const missing = expected.filter((key) => (pack as Record<string, unknown>)[key] === undefined);
   expect(missing, 'tsdown value exports missing from vite-plus/pack').toEqual([]);
 });
+
+test('builds each workspace member in its own directory with member configs disabled', async ({
+  onTestFinished,
+}) => {
+  const { build } = await import('../pack.js');
+  const root = mkdtempSync(join(tmpdir(), 'vp-pack-workspace-'));
+  onTestFinished(() => rmSync(root, { recursive: true, force: true }));
+  writeFileSync(join(root, 'index.js'), 'export default 99');
+
+  for (const [name, value] of Object.entries({ a: 11, b: 55 })) {
+    const member = join(root, 'packages', name);
+    mkdirSync(member, { recursive: true });
+    writeFileSync(join(member, 'index.js'), `export default ${value}`);
+    writeFileSync(join(member, 'tsdown.config.mjs'), 'throw new Error("member config loaded")');
+  }
+
+  await build({
+    cwd: root,
+    workspace: { include: 'packages/*', config: false },
+    entry: ['index.js'],
+    format: 'cjs',
+    fixedExtension: true,
+    dts: false,
+  });
+
+  const require = createRequire(join(root, 'package.json'));
+  expect(require('./packages/a/dist/index.cjs')).toBe(11);
+  expect(require('./packages/b/dist/index.cjs')).toBe(55);
+  expect(existsSync(join(root, 'dist'))).toBe(false);
+});

patches/tsdown@0.23.4.patch

@@ -0,0 +1,7 @@
+diff --git a/dist/build-wv1dWHDH.mjs b/dist/build-wv1dWHDH.mjs
+--- a/dist/build-wv1dWHDH.mjs
++++ b/dist/build-wv1dWHDH.mjs
+@@ -75,1 +75,2 @@ async function resolveWorkspace(config, inlineConfig, context, rootDeps) {
+-			debug$5("loading workspace config %s", cwd);
++			if (workspaceConfig === false) return [mergeConfig(normalized, { cwd })];
++			debug$5("loading workspace config %s", cwd);

pnpm-workspace.yaml

@@ -174,6 +174,7 @@ packageExtensions:
     dependencies:
       typescript: ~6.0.3
 patchedDependencies:
+  tsdown@0.23.4: patches/tsdown@0.23.4.patch
   chokidar@3.6.0: vite/patches/chokidar@3.6.0.patch
   dotenv-expand@13.0.0: vite/patches/dotenv-expand@13.0.0.patch
   sirv@3.0.2: vite/patches/sirv@3.0.2.patch