getting error zsh: command not found: flutterfire

I'm developing app in flutter and did firebase configuration to my flutter app.Using IDE - VSCode, Firebase configuration for flutter project.

I'm getting error all time:

zsh: command not found: flutterfire, giving error Undefined name 'DefaultFirebaseOptions'.
Try correcting the name to one that is defined, or defining the name.dart
undefined_identifier

This is my code -

import 'firebase_options.dart';


Future<void> main() async {`enter code here`
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  
  runApp(const MyApp());
}
        

I'm getting error all time

    logcat ==

    getting error -  zsh: command not found: flutterfire
    
         flutterfire configure
        zsh: command not found: flutterfire

follow the Homebrew installation steps -

% /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

check for % brew --version

if it produce error : zsh: command not found: brew 

then install git using cmd :

% brew install git

it may give this error again : zsh: command not found: brew

then again check for :  

% git --version

if git installed will show this : git version 2.39.3 (Apple Git-146)

then run cmd to export path : % export PATH="/opt/homebrew/bin:$PATH"

print path : check this cmd

% echo $PATH

it will take few min

after that run cmd to install git

% brew install git

it will download files

you will see 

- zsh completions and functions have been installed to:
  /opt/homebrew/share/zsh/site-functions

check for version :

% brew --version

Homebrew 4.3.14

Cheers:  zsh: command not found: brew issue fixed now!