tsconfig.json

{
  "compilerOptions": {
    "target": "es2018",
    "lib": [
      "es6",
      "dom",
      "dom.iterable",
      "esnext",
      "es2018"
    ],
    "strict": true,
    "noImplicitAny": true,
    "noImplicitThis": true,
    "noImplicitReturns": true,
    "alwaysStrict": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "strictBindCallApply": true,
    "downlevelIteration": true,
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "forceConsistentCasingInFileNames": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "noEmitOnError": true,
    "jsx": "react",
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "typeRoots": [
      "node_modules/@types"
    ],
    "sourceMap": true,
    "inlineSources": true,
    "sourceRoot": "/"
  },
  "include": [
    "src"
  ]
}

To be combined with a reasonable ESLint config: https://gist.github.com/fkirc/8c62c360255e82f11b9eb3815142326b