[Unsupported] Installing node-sass 4.11.0 on Node 12

[jasonfb]

NODE: v11.8.0 installed with yarn (not npm)
node-sass: 4.11.0

working in a Express + CRA app, with a server/ and client/ directory (served with concurrently), my problem is only isolated to development on Mac oS 10.13 High Sierra.

It happened after a DOWNGRADE of X Code from 10.0-> 9.4.1

first, I was unable yarn start, consistently getting this

Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (72)

I found closed issue #1764 which seems to have consensus that the fix is npm rebuild node-sass is the fix. However, this 1) did not succeed at all for me (it crashed), and 2) I am using yarn not npm

• NPM version (npm -v):
  6.5.0

• Node version (node -v):
  v11.8.0

• Node Process (node -p process.versions):

{ node: '11.8.0',
  v8: '7.0.276.38-node.16',
  uv: '1.25.0',
  zlib: '1.2.11',
  brotli: '1.0.7',
  ares: '1.15.0',
  modules: '67',
  nghttp2: '1.34.0',
  napi: '4',
  llhttp: '1.0.1',
  http_parser: '2.8.0',
  openssl: '1.1.0j',
  cldr: '34.0',
  icu: '63.1',
  tz: '2018e',
  unicode: '11.0' }

• Node Platform (node -p process.platform):
  darwin

• Node architecture (node -p process.arch):
  x64

[jasonfb]

I ran into this problem after what I Think was caused by an X Code 10.1 -> 9.4 DOWNGRADE (I think that's what caused it). First I had some nasty problems with node-sass, then I blew away my node_modules and was then unable to yarn install again without serious problems.

then I got through that but got to

Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (72)

I was able to fix this by switching my system over from (what I think was) brew-installed node, which annoyingly is difficult to downgrade, to nvm (https://github.com/nvm-sh/nvm)

then, once I made sure I had the right node version, I was able to
yarn cache clean

and also yarn install

then I ran into a nasty rabbit hole with the dev environment only, which was simply fixed by restarting my system after which my app started booting in dev again.

[nschonni]

Node 12 is only supported by node-sass 4.12+ https://github.com/sass/node-sass#supported-nodejs-versions-vary-by-release-please-consult-the-releases-page-below-is-a-quick-guide-for-minimium-support