reate-react-app: webpack typescrpt alias

tsconfig.json添加：

"baseUrl": ".",
"paths": {
   "@/*": ["src/*"],
   "@assets/*": ["src/assets/*"], // css, html中需要 `~@assets/*`
}

config/webpack.config.js

function resolvePath(dir) {
  return path.join(__dirname, '..', dir)
}

'@': resolvePath('src')