tsconfig.json

{
    "compilerOptions": {
        "noFallthroughCasesInSwitch": true,
        "noImplicitAny": true,
        "noImplicitReturns": true,
        "noImplicitThis": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "downlevelIteration": true,
        "alwaysStrict": true,
        "strictNullChecks": true,
        "target": "es6",
        "lib": [
            "dom",
            "dom.iterable",
            "esnext"
        ],
        "allowJs": true,
        "skipLibCheck": true,
        "esModuleInterop": true,
        "allowSyntheticDefaultImports": true,
        "strict": true,
        "forceConsistentCasingInFileNames": true,
        "module": "esnext",
        "moduleResolution": "node",
        "resolveJsonModule": true,
        "noEmit": true,
        "jsx": "react",
        "rootDir": "./src",
        "sourceMap": true,
        "baseUrl": "."
    },
    "include": ["./src/index.tsx", "./src/declarations"]
}