tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */ 
    "target": "es5",
    "module": "commonjs",
    "lib": ["es2015", "es2016", "es2017", "dom"],
    "declaration": true,
    "sourceMap": true,
    "outDir": "./dist",
    "rootDir": "./src",
    "noEmitHelpers": true,
    "importHelpers": true,
                                              
    /* Strict Type-Checking Options */        
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "noImplicitThis": true,
                                              
    /* Additional Checks */                   
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
                                              
    /* Module Resolution Options */           
    "moduleResolution": "node",
    "baseUrl": "./src",
                                              
    /* Experimental Options */                
    "experimentalDecorators": true
  }
}