使用node-sass遇到了错误，google了一圈没发现几个有帮助的，参考了一个答案，最终解决了这个问题。在这里做个笔记，给碰到同样问题的人。
2020-06-14 更新：最终发现是mac下python的问题，重新安装一下就好了：
brew reinstall python@2
错误的log：
ERROR in ./src/ui/styles/global.scss (./node_modules/css-loader/dist/cjs.js!./node_modules/sass-loader/dist/cjs.js!./src/ui/styles/global.scss)
Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
Error: Missing binding YOUR_PROJECT_PATH/node_modules/node-sass/vendor/darwin-x64-72/binding.node
Node Sass could not find a binding for your current environment: OS X 64-bit with Node.js 12.x
Found bindings for the following environments:
- OS X 64-bit with Node.js 12.x
This usually happens because your environment has changed since running `npm install`.
Run `npm rebuild node-sass` to download the binding for your current environment.
at module.exports (YOUR_PROJECT_PATH/node_modules/node-sass/lib/binding.js:15:13)
at Object.<anonymous> (YOUR_PROJECT_PATH/node_modules/node-sass/lib/index.js:14:35)
at Module._compile (YOUR_PROJECT_PATH/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:770:10)
at Module.load (internal/modules/cjs/loader.js:628:32)
at Function.Module._load (internal/modules/cjs/loader.js:555:12)
at Module.require (internal/modules/cjs/loader.js:666:19)
at require (YOUR_PROJECT_PATH/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
at getDefaultSassImplementation (YOUR_PROJECT_PATH/node_modules/sass-loader/dist/getDefaultSassImplementation.js:24:10)
at getSassImplementation (YOUR_PROJECT_PATH/node_modules/sass-loader/dist/getSassImplementation.js:19:72)
at Object.loader (YOUR_PROJECT_PATH/node_modules/sass-loader/dist/index.js:40:61)
@ ./src/ui/styles/global.scss 2:26-143
@ ./src/ui/App.tsx
@ ./src/ui/index.tsx
注意错误log中的路径是：node_modules/node-sass/vendor/darwin-x64-72/binding.node
npm rebuild node-sass会去下载对应的binding.node。如果用npm rebuild node-sass 下载失败，可以尝试手动下载对应的binding.node。具体步骤：
解决方法：
1. 访问url https://github.com/sass/node-sass/releases
2. 找到对应的 darwin-x64-72 名字，我的是 darwin-x64-72_binding.node，下载到本地的 node_modules/node-sass/vendor/darwin-x64-72/ 目录中
3. 将 darwin-x64-72_binding.node 改为 binding.node
4. done
