tsconfig.json

{  
  "compilerOptions": {    
    "target": "es6",                              
    "module": "commonjs",                                                                    
    "moduleResolution": "node",         
    "lib": ["es6", "es2015.generator"],                                                     
    "outDir": "./build",                                     
    "importHelpers": true,                                 
    "strict": true,                               
    "typeRoots": ["node_modules/@types"],                           
    "types": ["node"],                               
    "allowSyntheticDefaultImports": true,
    "suppressImplicitAnyIndexErrors": true                                        
  },  
  "include": [    
    "**/*"  
  ],  
  "exclude": [    
    "node_modules",    
    "**/*.spec.ts"  
  ]
}