Error: Node Sass does not yet support your current environment:

Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (88)
For more information on which environments are supported please see:

Any ideas?

About My Mac

Found a solution had to downgrade node
Run the following 
   npm install -g n 
   sudo n 14.15.0     

I had the same thing. I had to run npm rebuild node-sass if I remember right.

Same thing happened to me. My issue was resolved when I installed the correct version of node and made sure I had the Xocde command line tools installed.

I use nvm to manage different node versions...