tsconfig.json

{
  "compilerOptions": {
    "module":"commonjs",
    "moduleResolution": "node",
    "target": "es5",
    "lib": ["es5", "es2015", "es2016", "es2017", "dom"],
    "strict": true,
    "allowSyntheticDefaultImports": true,
    "declaration": true,
    "importHelpers": true,
    "noImplicitAny": true,
    "outDir": "./dist/",
    "declarationDir": "./dist/",
    "strictNullChecks": true,
    "allowUnreachableCode": false,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "noImplicitReturns": true,
    "noUnusedParameters": true,
    "noUnusedLocals": true,
    "noFallthroughCasesInSwitch": true,
    "downlevelIteration" : true,
    "skipLibCheck": true,
    "typeRoots": ["./node_modules/@types"]
  },
  "exclude": [
    "./node_modules"
	],
	"include": [
		"./src/**/*.ts"
	]
}