tsconfig.json

{
  "compilerOptions": {
    // Target latest version of ECMAScript.
    "target": "esnext",
    // Process & infer types from .js files.
    // "allowJs": true,
    // Don't emit; allow Babel to transform files.
    "emitDeclarationOnly": true,
    // Enable strictest settings like strictNullChecks & noImplicitAny.
    "strict": true,
    // Disallow features that require cross-file information for emit.
    "isolatedModules": false,
    // Import non-ES modules as default imports.
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "declaration": true,
    //    "inlineSourceMap": true,
    //    "inlineSources": true,
    "lib": ["dom", "esnext", "es5"],
    "module": "esnext",
    // Search under node_modules for non-relative imports.
    "moduleResolution": "node",
    "noImplicitAny": false,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "outDir": ".",
    "removeComments": true,
    "resolveJsonModule": true,
    "rootDir": "src",
    "strictNullChecks": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules/**", "**/*.spec.ts"]
}