tsconfig.json

{
    "compilerOptions": {
        "outDir": "build/dist",
        "target": "es5",
        "lib": [
            "dom",
            "dom.iterable",
            "esnext"
        ],
        "sourceMap": true,
        "noImplicitReturns": true,
        "noImplicitThis": true,
        "noImplicitAny": true,
        "strictNullChecks": true,
        "noUnusedLocals": false,
        "experimentalDecorators": true,
        "newLine": "LF",
        "allowJs": true,
        "skipLibCheck": true,
        "esModuleInterop": true,
        "allowSyntheticDefaultImports": true,
        "strict": true,
        "forceConsistentCasingInFileNames": true,
        "suppressImplicitAnyIndexErrors": true,
        "module": "esnext",
        "moduleResolution": "node",
        "resolveJsonModule": true,
        "isolatedModules": true,
        "noEmit": true,
        "jsx": "preserve"
    },
    "include": [
        "src", "src/__tests__"
    ]
}