ERROR: ts_transformer_keys_1.keys is not a function

[gbbarroso]

Not sure if it is my fault or not, but I'm using the README's example and getting this error:

const keysOfProps = keys<Props>();
                    ^
TypeError: ts_transformer_keys_1.keys is not a function
    at Object.<anonymous> (C:\Users\Gabriel\Projects\typescript-proj\index.ts:8:21)
    at Module._compile (module.js:649:30)
    at Module.m._compile (C:\Users\Gabriel\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:402:23)
    at Module._extensions..js (module.js:660:10)
    at Object.require.extensions.(anonymous function) [as .ts] (C:\Users\Gabriel\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:405:12)
    at Module.load (module.js:561:32)
    at tryModuleLoad (module.js:501:12)
    at Function.Module._load (module.js:493:3)
    at Function.Module.runMain (module.js:690:10)
    at Object.<anonymous> (C:\Users\Gabriel\AppData\Roaming\npm\node_modules\ts-node\src\bin.ts:145:12)

I have these dependencies:

  "dependencies": {
    "ts-transformer-keys": "^0.3.1",
    "typescript": "^2.8.3"
  }

My code:

import { keys } from 'ts-transformer-keys';

interface Props {
  id: string;
  name: string;
  age: number;
}
const keysOfProps = keys<Props>();

console.log(keysOfProps); // ['id', 'name', 'age']

Thanks in advance

[kimamula]

I reopened #4 to avoid duplicates as it seems that many people are encountering this error.

I would like to know how you are using the custom transformer to compile the keys function.
The example usage of the custom transformer is written here.