feat(v0.2): Firebase storage server adapter (#199)

Adds `FirebaseStorage` exported from `nuxt-upload-kit/server/firebase`,
using `firebase-admin` directly for V4 signed URLs, direct uploads, and
deletes. Wires up the build entry and externals so the new subpath
export actually ships.

Author: genu

build.config.ts

@@ -1,7 +1,7 @@
 import { defineBuildConfig } from "unbuild"
 
 const providers = ["s3", "azure-datalake", "firebase"]
-const serverEntries = ["index", "s3", "azure"]
+const serverEntries = ["index", "s3", "azure", "firebase"]
 
 export default defineBuildConfig({
   entries: [
@@ -20,6 +20,8 @@ export default defineBuildConfig({
     "@azure/storage-blob",
     "@azure/storage-file-datalake",
     "firebase/storage",
+    "firebase-admin/app",
+    "firebase-admin/storage",
     "@aws-sdk/client-s3",
     "@aws-sdk/s3-request-presigner",
     "h3",

package.json

@@ -44,6 +44,10 @@
     "./server/azure": {
       "types": "./dist/server/azure.d.mts",
       "import": "./dist/server/azure.mjs"
+    },
+    "./server/firebase": {
+      "types": "./dist/server/firebase.d.mts",
+      "import": "./dist/server/firebase.mjs"
     }
   },
   "scripts": {
@@ -85,6 +89,7 @@
     "eslint-config-prettier": "10.1.8",
     "eslint-plugin-prettier": "5.5.5",
     "firebase": "12.12.1",
+    "firebase-admin": "13.8.0",
     "h3": "1.15.11",
     "happy-dom": "20.9.0",
     "nuxt": "4.4.2",
@@ -103,7 +108,8 @@
     "@azure/storage-file-datalake": "^12.0.0",
     "@ffmpeg/ffmpeg": "^0.12.0",
     "@ffmpeg/util": "^0.12.0",
-    "firebase": "^10.0.0 || ^11.0.0 || ^12.0.0"
+    "firebase": "^10.0.0 || ^11.0.0 || ^12.0.0",
+    "firebase-admin": "^12.0.0 || ^13.0.0"
   },
   "peerDependenciesMeta": {
     "@aws-sdk/client-s3": {
@@ -129,6 +135,9 @@
     },
     "firebase": {
       "optional": true
+    },
+    "firebase-admin": {
+      "optional": true
     }
   },
   "packageManager": "pnpm@10.33.2"

playground/server/upload.server.config.ts

@@ -1,5 +1,6 @@
 import { defineUploadServerConfig, MaxFileSize, AllowedMimeTypes } from "#upload-kit/server"
 import { S3Storage } from "nuxt-upload-kit/server/s3"
+// Also available: AzureStorage from "nuxt-upload-kit/server/azure", FirebaseStorage from "nuxt-upload-kit/server/firebase"
 
 const env = process.env