tsconfig.json

{
  "compilerOptions": {
    "baseUrl": "./", // enables absolute path imports
    "outDir": "build/dist", // target for compiled files
    "module": "es2015", // "es2015" for tree-shaking
    "target": "es2015", // "es2015" for ES6+ engines
    "lib": ["ES2015", "dom"],
    "sourceMap": true, // include js files
    "allowJs": true, // include js files
    "jsx": "react", // process JSX
    "moduleResolution": "node",
    "rootDir": "src",
    "forceConsistentCasingInFileNames": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "suppressImplicitAnyIndexErrors": true,
    "noUnusedLocals": true,
    "paths": { // define absolute path mappings
      "@app/*": ["src/*"] // will enable -> import { ... } from '@app/components'. !!! if you change this, change alias in webpack.config also
    }
  },
  "exclude": [
    "node_modules",
    "build",
    "scripts",
    "acceptance-tests",
    "webpack",
    "jest",
    "src/setupTests.ts",
    "config"
  ]
}