This syntax requires an imported helper named '__spreadArrays' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.ts

{
  // ...rest of config
  "compilerOptions": {
    // ...rest of compiler options
    "baseUrl: ".",
    "paths": {
      "tslib" : ["path/to/node_modules/tslib/tslib.d.ts"]
    }
  }
}
npm install tslib