Cannot Load Module "@servicestack/client"

app.ts

// This file is located in /src/js/app.ts

import { JsonServiceClient } from "@servicestack/client";

package.json

{
  "name": "servicestack-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@servicestack/client": "^1.0.0"
  }
}

tsc output

λ tsc
src/js/app.ts(1,35): error TS2307: Cannot find module '@servicestack/client'.

tsconfig.json

{
    "include": [
        "/src/js/**/*.ts"
    ],
    "compilerOptions": {
        "noImplicitAny": true,
        "target": "es5",
        "module": "amd",
        "lib": [ "es2015", "dom" ]
    }
}