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You'll need a Node.js environment to write functions, and you'll need the Firebase CLI (which also requires Node.js and npm) to deploy functions to the Cloud Functions runtime. From among the supported Node.js versions available for Cloud Functions, we strongly recommend Node.js 8 for getting started. For installing Node.js and npm, Node Version Manager is recommended.

Once you have Node.js and npm installed, install the Firebase CLI via npm:

npm install -g firebase-tools

This installs the globally available firebase command. If the command fails, you may need to change npm permissions. To update to the latest version of firebase-tools, rerun the same command.

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