change: Deprecate Node.js 16 support (#2574)

* change: Deprecate Node versions that reached EoL

* change expected error to regex

* update readme.md

* update readme.md

.github/workflows/ci.yml

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

README.md

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

test/unit/app/firebase-app.spec.ts

@@ -182,7 +182,7 @@ describe('FirebaseApp', () => {
       process.env[FIREBASE_CONFIG_VAR] = '{,,';
       expect(() => {
         firebaseNamespace.initializeApp();
-      }).to.throw('Failed to parse app options file: SyntaxError: Unexpected token ,');
+      }).to.throw(/Failed to parse app options file: SyntaxError:/);
     });
 
     it('should throw when the environment variable points to an empty file', () => {