tsconfig.json

{
    "compilerOptions": {
        /* Basic Options */
        "target": "es5",
        "module": "commonjs",
        "lib": ["dom","es2015"],
        "sourceMap": true,
        "outDir": "dist",
        "downlevelIteration": true,

        /* Strict Type-Checking Options */
        "strict": true,

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

        /* Module Resolution Options */
        "moduleResolution": "node",
        "forceConsistentCasingInFileNames": true,
        // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
        // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
        // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
        // "typeRoots": [],                       /* List of folders to include type definitions from. */
        // "types": [],                           /* Type declaration files to be included in compilation. */
        // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
        "esModuleInterop": true
    },
    "include": ["src/**/*"],
    "exclude": ["node_modules", "**/*.spec.ts"]
}