change: Update Node support to 18 (#2756)

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x, 20.x, 22.x]
+        node-version: [18.x, 20.x, 22.x]
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/nightly.yml

@@ -36,7 +36,7 @@ jobs:
     - name: Set up Node.js
       uses: actions/setup-node@v4
       with:
-        node-version: 14.x
+        node-version: 18.x
 
     - name: Install and build
       run: |

.github/workflows/release.yml

@@ -47,7 +47,7 @@ jobs:
     - name: Set up Node.js
       uses: actions/setup-node@v4
       with:
-        node-version: 14.x
+        node-version: 18.x
 
     - name: Install and build
       run: |
@@ -117,7 +117,7 @@ jobs:
     - name: Set up Node.js
       uses: actions/setup-node@v4
       with:
-        node-version: 14.x
+        node-version: 18.x
 
     - name: Publish preflight check
       id: preflight

README.md

@@ -59,8 +59,7 @@ requests, code review feedback, and also pull requests.
 
 ## Supported Environments
 
-We support Node.js 14 and higher. However, Node.js 14 and 16 support is deprecated. We strongly encourage
-you to use Node.js 18 or higher as we will drop support for Node.js 14 and 16 in the next major version.
+We support Node.js 18 and higher.
 
 Please also note that the Admin SDK should only
 be used in server-side/back-end environments controlled by the app developer.

package.json

@@ -6,7 +6,7 @@
   "license": "Apache-2.0",
   "homepage": "https://firebase.google.com/",
   "engines": {
-    "node": ">=14"
+    "node": ">=18"
   },
   "scripts": {
     "build": "gulp build",