Ionic, Angular 5 and firebase for a uber clone app

i am try to run my ionic and angular with firebase App, but it giving me environment error.
below is the error message:

Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (83)
For more information on which environments are supported please see:

This happens at time of running npm install?

Then is likely a version mismatch of your node version and the project. Use nvm to manage node versions

Did u migrate something?

Or better: please tell command you ran and output?

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