feat(cli): tsup -> tsdown -> Vite+ migration

.github/scripts/upgrade-deps.ts

@@ -363,6 +363,50 @@ async function updateVitestVersionConstant(vitestVersion: string): Promise<void>
   console.log('Updated packages/cli/src/utils/constants.ts');
 }
 
+// ============ Update tsdown-migrate version ============
+// The current RC adds non-TTY support while it still targets tsdown 0.22.14.
+// Keep that RC until the stable tsdown version advances. At that point, require
+// tsdown-migrate to have the same stable version and replace the RC pin.
+async function updateTsdownMigrateVersion(
+  tsdownVersion: string,
+  stableMigrateVersion: string,
+): Promise<void> {
+  const tsdownChange = changes.get('tsdown');
+  if (!tsdownChange) {
+    throw new Error('The tsdown catalog update did not record a version');
+  }
+
+  const filePath = path.join(ROOT, 'packages/cli/src/utils/constants.ts');
+  const content = fs.readFileSync(filePath, 'utf8');
+  const pattern = /export const TSDOWN_MIGRATE_VERSION = '([\d.]+(?:-[\w.]+)?)';/;
+  let currentMigrateVersion: string | undefined;
+  const tsdownAdvanced = tsdownChange.old !== tsdownChange.new;
+
+  if (tsdownAdvanced && stableMigrateVersion !== tsdownVersion) {
+    throw new Error(
+      `Stable tsdown advanced to ${tsdownVersion}, but stable tsdown-migrate is ` +
+        `${stableMigrateVersion}. Update their compatibility before the dependency upgrade.`,
+    );
+  }
+
+  const updated = content.replace(pattern, (_match: string, captured: string) => {
+    currentMigrateVersion = captured;
+    const nextMigrateVersion = tsdownAdvanced ? stableMigrateVersion : captured;
+    return `export const TSDOWN_MIGRATE_VERSION = '${nextMigrateVersion}';`;
+  });
+  if (currentMigrateVersion === undefined) {
+    throw new Error(
+      `Failed to match TSDOWN_MIGRATE_VERSION in ${filePath} — the pattern ${pattern} is stale, ` +
+        `please update it in .github/scripts/upgrade-deps.ts`,
+    );
+  }
+
+  const nextMigrateVersion = tsdownAdvanced ? stableMigrateVersion : currentMigrateVersion;
+  fs.writeFileSync(filePath, updated);
+  recordChange('tsdown-migrate', currentMigrateVersion, nextMigrateVersion);
+  console.log('Updated packages/cli/src/utils/constants.ts');
+}
+
 // ============ Update README.md manual-migration vitest pins ============
 // The manual-migration guide pins `vitest` to an exact version in three places —
 // the npm/Bun `overrides` block, the pnpm-workspace `overrides` block, and the
@@ -519,6 +563,7 @@ console.log('Fetching latest versions…');
 const [
   vitestVersion,
   tsdownVersion,
+  stableTsdownMigrateVersion,
   lightningcssVersion,
   devtoolsVersion,
   oxcNodeCliVersion,
@@ -534,6 +579,7 @@ const [
 ] = await Promise.all([
   getLatestNpmVersion('vitest'),
   getLatestNpmVersion('tsdown'),
+  getLatestNpmVersion('tsdown-migrate'),
   // Mirror exactly what the bundled @tsdown/css depends on.
   getNpmDependencyRange('@tsdown/css', 'lightningcss'),
   getLatestNpmVersion('@vitejs/devtools'),
@@ -551,6 +597,7 @@ const [
 
 console.log(`vitest: ${vitestVersion}`);
 console.log(`tsdown: ${tsdownVersion}`);
+console.log(`tsdown-migrate (stable): ${stableTsdownMigrateVersion}`);
 console.log(`lightningcss (from @tsdown/css): ${lightningcssVersion}`);
 console.log(`@vitejs/devtools: ${devtoolsVersion}`);
 console.log(`@oxc-node/cli: ${oxcNodeCliVersion}`);
@@ -580,6 +627,7 @@ await updatePnpmWorkspace({
   oxcParser: oxcParserVersion,
   oxcTransform: oxcTransformVersion,
 });
+await updateTsdownMigrateVersion(tsdownVersion, stableTsdownMigrateVersion);
 await updateVitestVersionConstant(vitestVersion);
 await updateReadmeVitestPins(vitestVersion);
 await updateCorePackage(devtoolsVersion);

.github/workflows/e2e-test.yml

@@ -284,6 +284,11 @@ jobs:
               vp run lint
               vp run test:run
               npx tsc --noEmit
+          - name: decoders
+            node-version: 24
+            command: |
+              vp pack
+              vp test
           - name: vite-vue-vercel
             node-version: 24
             command: |

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/migration_from_tsup/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "migration-from-tsup",
+  "scripts": {
+    "build": "tsup --config tsup.config.ts"
+  },
+  "devDependencies": {
+    "tsup": "^8.5.0",
+    "vite": "^7.0.0"
+  }
+}

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/migration_from_tsup/snapshots.toml

@@ -0,0 +1,72 @@
+[[case]]
+name = "migration_from_tsup_success"
+vp = "local"
+env = { VP_CLI_BIN = "./tsdown-migrate-stub.mjs" }
+steps = [
+  { argv = ["vpt", "chmod", "+x", "tsdown-migrate-stub.mjs"], comment = "stub tsdown-migrate so the migration stays offline", continue-on-failure = true },
+  { argv = ["vp", "migrate", "--no-interactive", "--no-hooks", "--no-agent", "--no-editor"], comment = "tsup config should migrate automatically", continue-on-failure = true },
+  { argv = ["vpt", "stat-file", "tsup.config.ts", "--assert-not", "file"], comment = "the original tsup config is removed", continue-on-failure = true },
+  { argv = ["vpt", "print-file", "tsdown.config.ts"], comment = "the converted config uses vite-plus pack", continue-on-failure = true },
+  { argv = ["vpt", "print-file", "vite.config.ts"], comment = "the converted config is connected to vite.config.ts", continue-on-failure = true },
+  { argv = ["vpt", "print-file", "package.json"], comment = "tsup is removed and its script uses vp pack", continue-on-failure = true },
+]
+
+[[case]]
+name = "migration_from_tsup_failure"
+vp = "local"
+env = { VP_CLI_BIN = "./tsdown-migrate-stub.mjs", TSDOWN_MIGRATE_STUB_FAIL = "1" }
+steps = [
+  { argv = ["vpt", "chmod", "+x", "tsdown-migrate-stub.mjs"], comment = "stub a tsdown-migrate failure", continue-on-failure = true },
+  { argv = ["vp", "migrate", "--no-interactive", "--no-hooks", "--no-agent", "--no-editor"], comment = "a failed automatic migration should show manual options", continue-on-failure = true },
+  { argv = ["vpt", "stat-file", "tsup.config.ts", "--assert", "file"], comment = "the original tsup config is preserved", continue-on-failure = true },
+  { argv = ["vpt", "stat-file", "tsdown.config.ts", "--assert-not", "file"], comment = "no converted config is left behind", continue-on-failure = true },
+  { argv = ["vpt", "print-file", "package.json"], comment = "the tsup dependency and script are preserved", continue-on-failure = true },
+]
+
+[[case]]
+name = "migration_from_tsup_config_collision"
+vp = "local"
+steps = [
+  { argv = ["vpt", "write-file", "tsdown.config.ts", "export default { existing: true };\n"], snapshot = false },
+  { argv = ["vp", "migrate", "--no-interactive", "--no-hooks", "--no-agent", "--no-editor"], comment = "an existing tsdown config should stop automatic migration before it overwrites files", continue-on-failure = true },
+  { argv = ["vpt", "print-file", "tsup.config.ts"], comment = "the original tsup config is unchanged" },
+  { argv = ["vpt", "print-file", "tsdown.config.ts"], comment = "the existing tsdown config is unchanged" },
+  { argv = ["vpt", "print-file", "package.json"], comment = "the tsup dependency and script are unchanged" },
+]
+
+[[case]]
+name = "migration_from_tsup_inline_config_collision"
+vp = "local"
+steps = [
+  { argv = ["vpt", "rm", "tsup.config.ts"], snapshot = false },
+  { argv = ["vpt", "json-edit", "package.json", "scripts.build", "tsup"], snapshot = false },
+  { argv = ["vpt", "json-edit", "package.json", "tsup", '{"entry":["src/index.ts"]}'], snapshot = false },
+  { argv = ["vpt", "json-edit", "package.json", "tsdown", '{"entry":["src/existing.ts"]}'], snapshot = false },
+  { argv = ["vp", "migrate", "--no-interactive", "--no-hooks", "--no-agent", "--no-editor"], comment = "an existing inline tsdown config should stop automatic migration", continue-on-failure = true },
+  { argv = ["vpt", "print-file", "package.json"], comment = "both inline configs are unchanged" },
+]
+
+[[case]]
+name = "migration_from_tsup_inline_config"
+vp = "local"
+steps = [
+  { argv = ["vpt", "rm", "tsup.config.ts"], snapshot = false },
+  { argv = ["vpt", "json-edit", "package.json", "scripts.build", "tsup"], snapshot = false },
+  { argv = ["vpt", "json-edit", "package.json", "tsup", '{"entry":["src/index.ts"]}'], snapshot = false },
+  { argv = ["vp", "migrate", "--no-interactive", "--no-hooks", "--no-agent", "--no-editor"], comment = "an inline tsup config should stop automatic migration", continue-on-failure = true },
+  { argv = ["vpt", "print-file", "package.json"], comment = "the inline tsup config is unchanged" },
+]
+
+[[case]]
+name = "migration_from_tsup_custom_config"
+vp = "local"
+steps = [
+  { argv = ["vpt", "mkdir", "-p", "configs"], snapshot = false },
+  { argv = ["vpt", "write-file", "configs/legacy.ts", "export default {};\n"], snapshot = false },
+  { argv = ["vpt", "json-edit", "package.json", "scripts.build", "tsup --config configs/legacy.ts"], snapshot = false },
+  { argv = ["vpt", "json-edit", "package.json", "scripts.irregular", "tsup --config ././tsup.config.ts"], snapshot = false },
+  { argv = ["vp", "migrate", "--no-interactive", "--no-hooks", "--no-agent", "--no-editor"], comment = "unsupported config paths should stop automatic migration before any files change", continue-on-failure = true },
+  { argv = ["vpt", "print-file", "tsup.config.ts"], comment = "the standard config is unchanged" },
+  { argv = ["vpt", "print-file", "configs/legacy.ts"], comment = "the custom config is unchanged" },
+  { argv = ["vpt", "print-file", "package.json"], comment = "the unsupported scripts and tsup dependency are unchanged" },
+]

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/migration_from_tsup/snapshots/migration_from_tsup_config_collision.md

@@ -0,0 +1,68 @@
+# migration_from_tsup_config_collision
+
+## `vpt write-file tsdown.config.ts 'export default { existing: true };
+'`
+
+
+## `vp migrate --no-interactive --no-hooks --no-agent --no-editor`
+
+an existing tsdown config should stop automatic migration before it overwrites files
+
+**Exit code:** 1
+
+```
+VITE+ - The Unified Toolchain for the Web
+
+tsup configuration detected. Auto-migrating to tsdown...
+
+Automatic tsup migration was skipped because these tsdown configs already exist:
+  tsdown.config.ts
+
+Resolve this configuration conflict manually:
+  1. Merge the tsup and tsdown configurations into `pack` in `vite.config.*`.
+  2. Do not run `tsdown-migrate`. It can overwrite the existing tsdown configuration.
+
+Use the tsdown migration skill for guidance:
+  https://github.com/rolldown/tsdown/blob/main/skills/tsdown-migrate/SKILL.md
+Complete the tsup migration manually, then re-run `vp migrate`.
+```
+
+## `vpt print-file tsup.config.ts`
+
+the original tsup config is unchanged
+
+```
+import { defineConfig } from 'tsup';
+
+export default defineConfig({
+  entry: ['src/index.ts'],
+  dts: true,
+  format: ['esm', 'cjs'],
+  splitting: false,
+});
+```
+
+## `vpt print-file tsdown.config.ts`
+
+the existing tsdown config is unchanged
+
+```
+export default { existing: true };
+```
+
+## `vpt print-file package.json`
+
+the tsup dependency and script are unchanged
+
+```
+{
+  "name": "migration-from-tsup",
+  "scripts": {
+    "build": "tsup --config tsup.config.ts"
+  },
+  "devDependencies": {
+    "tsup": "^8.5.0",
+    "vite": "^7.0.0"
+  }
+}
+```

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/migration_from_tsup/snapshots/migration_from_tsup_custom_config.md

@@ -0,0 +1,80 @@
+# migration_from_tsup_custom_config
+
+## `vpt mkdir -p configs`
+
+
+## `vpt write-file configs/legacy.ts 'export default {};
+'`
+
+
+## `vpt json-edit package.json scripts.build 'tsup --config configs/legacy.ts'`
+
+
+## `vpt json-edit package.json scripts.irregular 'tsup --config ././tsup.config.ts'`
+
+
+## `vp migrate --no-interactive --no-hooks --no-agent --no-editor`
+
+unsupported config paths should stop automatic migration before any files change
+
+**Exit code:** 1
+
+```
+VITE+ - The Unified Toolchain for the Web
+
+tsup configuration detected. Auto-migrating to tsdown...
+
+Automatic tsup migration was skipped because these scripts use configs that cannot be migrated automatically:
+  package.json#build -> configs/legacy.ts
+  package.json#irregular -> ././tsup.config.ts
+
+Resolve these config paths manually:
+  1. Migrate each listed config into `pack` in `vite.config.*`.
+  2. Update each listed script.
+  3. Do not run `tsdown-migrate`. It cannot safely resolve these config paths.
+
+Use the tsdown migration skill for guidance:
+  https://github.com/rolldown/tsdown/blob/main/skills/tsdown-migrate/SKILL.md
+Complete the tsup migration manually, then re-run `vp migrate`.
+```
+
+## `vpt print-file tsup.config.ts`
+
+the standard config is unchanged
+
+```
+import { defineConfig } from 'tsup';
+
+export default defineConfig({
+  entry: ['src/index.ts'],
+  dts: true,
+  format: ['esm', 'cjs'],
+  splitting: false,
+});
+```
+
+## `vpt print-file configs/legacy.ts`
+
+the custom config is unchanged
+
+```
+export default {};
+```
+
+## `vpt print-file package.json`
+
+the unsupported scripts and tsup dependency are unchanged
+
+```
+{
+  "devDependencies": {
+    "tsup": "^8.5.0",
+    "vite": "^7.0.0"
+  },
+  "name": "migration-from-tsup",
+  "scripts": {
+    "build": "tsup --config configs/legacy.ts",
+    "irregular": "tsup --config ././tsup.config.ts"
+  }
+}
+```

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/migration_from_tsup/snapshots/migration_from_tsup_failure.md

@@ -0,0 +1,62 @@
+# migration_from_tsup_failure
+
+## `vpt chmod +x tsdown-migrate-stub.mjs`
+
+stub a tsdown-migrate failure
+
+```
+```
+
+## `vp migrate --no-interactive --no-hooks --no-agent --no-editor`
+
+a failed automatic migration should show manual options
+
+**Exit code:** 1
+
+```
+VITE+ - The Unified Toolchain for the Web
+
+tsup configuration detected. Auto-migrating to tsdown...
+
+Automatic tsup migration failed.
+
+Choose one of these manual migration methods:
+  1. Run `vp dlx tsdown-migrate` in the project root.
+  2. Use the tsdown migration skill:
+     https://github.com/rolldown/tsdown/blob/main/skills/tsdown-migrate/SKILL.md
+
+Complete the tsup migration manually, then re-run `vp migrate`.
+```
+
+## `vpt stat-file tsup.config.ts --assert file`
+
+the original tsup config is preserved
+
+```
+tsup.config.ts: file
+```
+
+## `vpt stat-file tsdown.config.ts --assert-not file`
+
+no converted config is left behind
+
+```
+tsdown.config.ts: missing
+```
+
+## `vpt print-file package.json`
+
+the tsup dependency and script are preserved
+
+```
+{
+  "name": "migration-from-tsup",
+  "scripts": {
+    "build": "tsup --config tsup.config.ts"
+  },
+  "devDependencies": {
+    "tsup": "^8.5.0",
+    "vite": "^7.0.0"
+  }
+}
+```