tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "allowSyntheticDefaultImports": true,
//    "baseUrl": ".",
//    "declaration": true,
//    "declarationDir": "dist/types",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "inlineSources": true,
    "lib": [
      "dom",
      "es5",
      "es2016"
    ],
    "module": "commonjs",
//    "module": "es2015", // will support tree shaking
    "moduleResolution": "node",
//    "noImplicitAny": true,
//    "paths": {
//      "d3-color": ["node_modules/d3-color"],
//      "d3-format": ["node_modules/d3-format"],
//      "d3-scale": ["node_modules/d3-scale"],
//      "d3-selection": ["node_modules/d3-selection"],
//      "d3-sankey": ["node_modules/d3-sankey"]
//    },
    "sourceMap": true,
    "strictNullChecks": true,
//    "strict": true,
    "target": "es5" // changed from es5 to es2015 while testing tree shaking
    // conflict between uglifysj which needs es5 and tree shaking
//    "typeRoots": [
//      "node_modules/@types"
//    ]
  },
  "exclude": [
    "node_modules"
  ],
  "include": [
    "app/**/*.ts"
  ]
}