feat: Separate preview server from react-email (#2182)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: Kaylee <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Bu Kinoshita <[email protected]>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: 5 people

.changeset/pre.json

@@ -35,7 +35,6 @@
   },
   "changesets": [
     "crazy-seas-eat",
-    "dirty-needles-chew",
     "great-parrots-yell",
     "mighty-pigs-add",
     "stupid-ghosts-decide",

.changeset/puny-chicken-argue.md

@@ -3,7 +3,7 @@
   "version": "0.0.0",
   "private": true,
   "scripts": {
-    "build": "email build",
+    "build": "pnpm install --frozen-lockfile && email build",
     "dev": "email dev",
     "start": "email start",
     "export": "email export"
@@ -15,7 +15,8 @@
     "react-email": "workspace:*"
   },
   "devDependencies": {
-    "next": "15.3.1",
+    "@react-email/preview-server": "workspace:*",
+    "next": "^15.2.4",
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "tsx": "4.19.3"

apps/demo/package.json

@@ -87,7 +87,7 @@
       "!**/pnpm-lock.yaml",
       "!**/.next",
       "!**/public",
-      "!packages/react-email/src/actions/email-validation/caniemail-data.ts",
+      "!packages/preview-server/src/actions/email-validation/caniemail-data.ts",
       "!**/.react-email/**/*",
       "!**/node_modules/**/*",
       "!**/*.d.ts",

biome.json

@@ -0,0 +1,5 @@
+node_modules
+.next
+
+# for testing
+static

packages/preview-server/.gitignore

@@ -0,0 +1,5 @@
+.react-email
+./emails
+./emails/static
+node_modules
+.turbo

packages/preview-server/.npmignore

@@ -0,0 +1,4 @@
+/**
+ * this file is just a placeholder file so that import.meta.resolve and require.resolve can properly
+ * find out the path to this module. This file does not do anything nor does it need to export anything of value.
+ */