tsconfig.json

{
    "compilerOptions": {
        /* Basic options */
        "target": "es5",
        "module": "commonjs",
        "lib": ["es2015", "dom", "dom.iterable", "esnext"],
        "allowJs": false,
        "jsx": "preserve",
        "skipLibCheck": false,
        "isolatedModules": false,
        "outDir": "lib",
        "declaration": true,

        /* Strict Type-Checking Options */
        "strict": true,
        "noImplicitAny": true,
        "strictNullChecks": false,
        "strictFunctionTypes": true,
        "strictPropertyInitialization": false,
        "noImplicitThis": true,
        "alwaysStrict": true,

        /* Additional Checks */
        "noUnusedLocals": false,
        "noUnusedParameters": false,
        "noImplicitReturns": true,
        "noFallthroughCasesInSwitch": false,

        /* Module Resolution Options */
        "moduleResolution": "node",
        "allowSyntheticDefaultImports": true,
        "esModuleInterop": true,

        /* Experimental Options */
        "experimentalDecorators": true
    },
    "include": ["src/**/*"]
}