tsconfig.json

{
  "compilerOptions": {
      "lib": ["esnext", "dom", "es2015"],
      // Target latest version of ECMAScript.
      "target": "es2015",
      // Search under node_modules for non-relative imports.
      "moduleResolution": "node",
      // Process & infer types from .js files.
      "allowJs": true,
      // Enable strictest settings like strictNullChecks & noImplicitAny.
      "strict": false,
      // Disallow features that require cross-file information for emit.
      "experimentalDecorators": true,
      "emitDecoratorMetadata": true,
      // Import non-ES modules as default imports.
      "esModuleInterop": true,
      "allowSyntheticDefaultImports": true,
      "resolveJsonModule": true,
      "outDir": "dist",
      "module": "commonjs",
      "baseUrl": "./src",
      "paths": {
          "/*": ["*"]
      }
  },
  "include": [
      "src/**/*", "spec/**/*"
  ],
  "exclude": [
      "node_modules",
      "*.bak*"
  ]
}