Hello World

hello-reason-function.md

type messageBody = {
  message: string,
  input: string
};

type response = {
  statusCode: int,
  body: Js.Json.t
};

let hello = (event, context, callback) => {
  let body : messageBody = {
    message: "Hello World!",
    input: event,
  };

  let response : response = {
    statusCode: 200,
    body: Js.Json.stringify(body)
  };

  callback(null, response);
}

I get the following compiler error (Line 19):

  17 ┆ let response : response = {
  18 ┆   statusCode: 200,
  19 ┆   body: Js.Json.stringify(body)
  20 ┆ };
  21 ┆

  This has type:
    messageBody
  But somewhere wanted:
    Js.Json.t (defined as Js.Json.t)