tsconfig.json

{
  "compilerOptions": {
    "charset": "utf8",
    "sourceMap": true,
    "allowSyntheticDefaultImports": true,
    "target": "es5",
    "moduleResolution": "node",
    "module": "umd",
    "outDir": "./dist",
    "experimentalDecorators": true,
    "removeComments": true,
    "preserveConstEnums": true,
    "diagnostics": true,
    "allowJs": true, // Allows to compile the javascript file 
    "declaration": true, //generate the corresponding .d.ts file
    "declarationDir": "./@types" // Specify the location for the declaration file separately 
  },
  "include": [
    "src/**/*"
  ],
  "exclude": [
    "node_modules",
    "dist"
  ]
}