Node Sass does not yet support your current environment: Windows 64-bit with Unsupported runtime (88)88) code example
Example 1: Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (88)
npm update node-sass
Example 2: Module build failed: Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (79)
npm rebuild node-sass