Improve Node.js version warning for standalone. Fix #2791.

CHANGELOG.md

@@ -0,0 +1 @@
+- Improves Node.js version warning for standalone Firebase CLI build (#2791).

src/emulator/functionsEmulator.ts

@@ -1014,10 +1014,21 @@ export class FunctionsEmulator implements EmulatorInstance {
       );
     } else {
       // Otherwise we'll warn and use the version that is currently running this process.
-      this.logger.log(
-        "WARN",
-        `Your requested "node" version "${requestedMajorVersion}" doesn't match your global version "${hostMajorVersion}". Using node@${hostMajorVersion} from host.`
-      );
+      if (process.env.FIREPIT_VERSION) {
+        this.logger.log(
+          "WARN",
+          `You've requested "node" version "${requestedMajorVersion}", but the standalone Firebase CLI comes with bundled Node "${hostMajorVersion}".`
+        );
+        this.logger.log(
+          "INFO",
+          `To use a different Node.js version, consider removing the standalone Firebase CLI and switching to "firebase-tools" on npm.`
+        );
+      } else {
+        this.logger.log(
+          "WARN",
+          `Your requested "node" version "${requestedMajorVersion}" doesn't match your global version "${hostMajorVersion}". Using node@${hostMajorVersion} from host.`
+        );
+      }
     }
 
     return process.execPath;