Strip out console.log for "This response was unable to be parsed as json" in production

[LuisAverhoff]

I'm using ember-fetch with ember data and I have a custom method in one of my adapters that returns csv instead of json.

The function determine-body-promise seem to emit a warning message in both production and development and is not ideal to have my entire csv payload, or any payload to be frank, be printed out in the console in production(development is fine).

My suggestion is the following.

// Add this line. You'll probably need to install ember-cli-babel as mentioned in
// https://github.com/emberjs/ember.js/issues/18062
import { DEBUG } from '@glimmer/env'; 

/**
 * Function that always attempts to parse the response as json, and if an error is thrown,
 * returns `undefined` if the response is successful and has a status code of 204 (No Content),
 * or 205 (Reset Content) or if the request method was 'HEAD', and the plain payload otherwise.
 */
export default function determineBodyPromise(
  response: Response,
  requestData: JQueryAjaxSettings
): Promise<object | string | undefined> {
  return response.text().then(function(payload) {
    let ret: string | object | undefined = payload;
    try {
      ret = JSON.parse(payload);
    } catch (error) {
      if (!(error instanceof SyntaxError)) {
        throw error;
      }
      const status = response.status;
      if (
        response.ok &&
        (status === 204 || status === 205 || requestData.method === 'HEAD')
      ) {
        ret = undefined;
      } else if(DEBUG) { // Check if we are in development mode.
        console.warn('This response was unable to be parsed as json.', payload);
      }
    }
    return ret;
  });
}

[nlfurniss]

Seems good, can you put up a PR @LuisAverhoff?

[nlfurniss]

Closed via #636