tsconfig.json

{
    "compilerOptions": {
        "target": "ES5" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
        "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
        "lib": [
            "es2017",
            "dom"
        ] /* Specify library files to be included in the compilation. */,
        "allowJs": false /* Allow javascript files to be compiled. */,
        "jsx": "react" /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */,
        "noImplicitAny": false /* Raise error on expressions and declarations with an implied 'any' type. */,
        "moduleResolution": "node" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
        "allowSyntheticDefaultImports": true /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */,
        "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
        "skipLibCheck": true,
        "outDir": "lib",
        "rootDir": "src",
        "declaration": true
    },
    "exclude": ["**/*.spec.ts", "**/*.spec.tsx", "**/*.spec.js"],
    "include": ["src"]
}