otf-frontend/client/src/tsconfig.app.json

{
  "extends": "../config/tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "baseUrl": "./",
    "module": "es2015",
    "types": [],
    "paths": {
      "fs": [
        "./global-shims"
      ]
    },
    "experimentalDecorators": true,
    "allowJs": true
  },
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ]
}