tsconfig.json

{
  "compilerOptions": {
    "esModuleInterop": true,
    "experimentalDecorators": true,
    "inlineSourceMap": false,
    "jsx": "react",
    "lib": [ "dom", "es2015", "scripthost" ],
    "module": "amd",
    "importHelpers": true,
    "noEmitHelpers": true,
    "noEmitOnError": true,
    "noImplicitAny": true,
    "noImplicitThis": true,
    "noImplicitUseStrict": true,
    "noUnusedLocals": true,
    "jsxFactory": "tsx",
    "suppressImplicitAnyIndexErrors": true,
    "target": "es5",
    "baseUrl": ".",
    "moduleResolution": "node",
    "types": [ 
      "dojo",
      "./typings/arcgis-js-api-4.20"
    ]
  },
  "include": [
    "./src/js/**/*"
  ],
  "exclude": [
    "node_modules",
    "typings"
  ]
}