IE11: ajax.getJSON returns string response

[johnhunter]

Bug Report

Current Behavior
With IE11 ajax.getJSON returns the response string

Expected behavior
With IE11 ajax.getJSON should return an object as other browsers do

Reproduction

** Please provide repro code does not involves framework, or other setups to address this bug is specific to rxjs core **

• REPL or Repo link:
  https://johnhunter.github.io/rxjs-ie11-getJSON-issue/

// Global rxjs from unpkg.com/[email protected]/dist/bundles/rxjs.umd.js
var ajax = rxjs.ajax.ajax;

var url = 'https://api.github.com/users?per_page=2';

var users = ajax.getJSON(url);
var subscribe = users.subscribe(
  function(res) { console.log(typeof res, res) },
  function(err) { console.error(err) }
);

• IE11 typeof res is "string"
• Chrome typeof res is "object" as expected

Environment

• Runtime: Browser IE11
• RxJS version: 7.2.0

[benlesh]

Seems like a workaround would be to check the type and JSON.parse:

const obj = typeof res === 'string' ? JSON.parse(res) : res;

[johnhunter]

Thanks @benlesh. I know that all IE support will be removed in v8 but do you think this regression will be patched in v7?

From PR #5661 it looks like this might have always been the behaviour with v7 (we were upgrading from 6.x.x).

[johnhunter]

Closing, version 8 is almost out and I no longer have to support IE.