Error in using require

[RixInGithub]

I run this code in the interpreter:

let fs = require {"fs"} in console.log {fs}

But it errors this:

Uncaught LambdaRuntimeError {
  _error: Error: runtime error: argument of 'require' must be a string
      at LambdaRuntimeError.LambdaError (C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\lambda.js:51:17)
      at new LambdaRuntimeError (C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\lambda.js:91:17)
      at C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\lambda.js:3272:13
      at SemiNativeNode.evaluate (C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\lambda.js:1902:30)
      at Closure.bind (C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\lambda.js:620:27)
      at ApplicationNode.evaluate (C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\lambda.js:1500:17)
      at LetNode.extend (C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\lambda.js:1554:49)
      at LetNode.evaluate (C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\lambda.js:1556:5)
      at C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\Main.js:33:23
      at REPLServer.eval (C:\Users\user\AppData\Roaming\npm\node_modules\lambda\bin\Main.js:44:18),
  message: "runtime error: argument of 'require' must be a string"
}