tsconfig.json

{
  "include": ["src", "types"],
  "compilerOptions": {
    "module": "esnext",
    "lib": ["dom", "esnext"],
    "pretty": true,
    "removeComments": false,
    "noImplicitAny": true,
    "noImplicitThis": true,
    "alwaysStrict": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "forceConsistentCasingInFileNames": true,
    "diagnostics": true,
    "listEmittedFiles": true,
    "strictNullChecks": true,
    "experimentalDecorators": true,
    "isolatedModules": true,
    "skipLibCheck": true,
    "resolveJsonModule": true,
    "importHelpers": false,
    "declaration": true,
    "sourceMap": true,
    "rootDir": "./src",
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "moduleResolution": "node",
    "baseUrl": "./",
    "paths": {
      "*": ["src/*", "node_modules/*"]
    },
    "jsx": "react",
    "esModuleInterop": true,
    "downlevelIteration": false
  }
}