otf-frontend/client/src/tsconfig.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"
    ]
  }