How to use the mirage.proj function in mirage

def main(self):
        with proj.MirageEnvironment(proj.MirageEnvironmentLevel.indjango):
            mys.log("Launching Django Python Shell")
            os.system("python manage.py shell")

mys.command("./node_modules/.bin/create-react-app shell")
            else:
                mys.command("./node_modules/.bin/create-react-app --scripts-version=react-scripts-ts shell")

            logger.update("Installing additional packages...")
            with proj.InDir("./shell"):
                mys.command("yarn add redux react-redux")
                mys.command("yarn add react-router react-router-dom")

            # Cleaning
            logger.update("Cleaning...", withLazy = True)
            fileable.rm("yarn.lock")
            fileable.rm("package.json")
            fileable.rm("node_modules/")

            with proj.InDir("./shell"):
                fileable.rm(".gitignore")
                fileable.rm("README.md")


        # Completed
        logger.update("Completed!")

mys.command("yarn add --dev @angular/cli")

            # To avoid ng inside the project error, remove package.package.json
            os.remove("package.json")

            logger.update("Configuring Angular setup tools to use Yarn package...")
            mys.command("./node_modules/.bin/ng set --global packageManager=yarn")
            logger.update("Creating Angular app...", withLazy = True)
            logger.update("Creating Angular app... ( please wait for a momenet )")
            mys.command("./node_modules/.bin/ng new shell")


            if self._plugins == "--nebular":
                logger.update("Installing Nebular packages...", withLazy = True)
                logger.update("Installing Nebular packages... ( please wait for a momenet )")
                with proj.InDir("./shell"):
                    mys.command("yarn add @nebular/theme @nebular/auth")

            elif self._plugins == "--material":
                logger.update("Installing material theme packages...")
                with proj.InDir("./shell"):
                    mys.command("yarn add @angular/material @angular/cdk")

            elif self._plugins == "--bootstrap":
                logger.update("Installing Bootstrap theme packages...")
                with proj.InDir("./shell"):
                    mys.command("yarn add ngx-bootstrap")


            # Cleaning
            logger.update("Cleaning...", withLazy = True)
            fileable.rm("yarn.lock")

# Add remote repo
            logger.update("Adding remote repository...", withLazy = True)
            mys.command("git remote add origin " + git_url)

            # Create React App
            logger.update("Creating React app...")
            self._create_package_json()
            mys.command("yarn add --dev create-react-app")

            if self._js_runtime == "--javascript":
                mys.command("./node_modules/.bin/create-react-app shell")
            else:
                mys.command("./node_modules/.bin/create-react-app --scripts-version=react-scripts-ts shell")

            logger.update("Installing additional packages...")
            with proj.InDir("./shell"):
                mys.command("yarn add redux react-redux")
                mys.command("yarn add react-router react-router-dom")

            # Cleaning
            logger.update("Cleaning...", withLazy = True)
            fileable.rm("yarn.lock")
            fileable.rm("package.json")
            fileable.rm("node_modules/")

            with proj.InDir("./shell"):
                fileable.rm(".gitignore")
                fileable.rm("README.md")


        # Completed
        logger.update("Completed!")