Node Sass does not yet support your current environment: OS X 64-bit

[zhilianbi520]

• NPM version (6.13.4):
• Node version (v12.16.0):
• Node Process (node -p process.versions):
• Node Platform ({ node: '12.16.0', v8: '7.8.279.23-node.31', uv: '1.34.0', zlib: '1.2.11', brotli: '1.0.7', ares: '1.15.0', modules: '72', nghttp2: '1.40.0', napi: '5', llhttp: '2.0.4', http_parser: '2.9.3', openssl: '1.1.1d', cldr: '35.1', icu: '64.2', tz: '2019c', unicode: '12.1' }):
• Node architecture (x64):
• node-sass version (node-sass 4.12.0 (Wrapper) [JavaScript] libsass 3.5.4 (Sass Compiler) [C/C++]):
• npm node-sass versions (node-sass@4.12.0):

mac :macOS Catalina OS version 10.15.3

[nschonni]

From you screenshot (please don't use screenshots in the future), you're also trying to install node-sass 4.9.4. That version isn't supported on Node 12. Find what package that has it as a dependency and upgrade it