Internet Explorer (v11): Object doesn't support property or method 'includes'

[mk-conn]

I was about to deploy my ember app to our testing environment where I am able to test in Internet Explorer and this "browser" comes up with an error. I tracked it down to

ember.js/packages/ember-metal/lib/error_handler.js

// To maintain stacktrace consistency across browsers
let getStack = error => {
  let stack = error.stack;
  let message = error.message;

  if (stack && !stack.includes(message)) {
    stack = `${message}\n${stack}`;
  }

  return stack;
};

But I don't have no clue how to fix it - I don't know If this is something caused by my code... In the IE debugger the variable 'error' is undefined... In every other browser there is no issue... :-/

[rwjblue]

Good catch! What version of Ember was this against? Would you mind taking a crack at a PR that fixes?

If you are interested, the fix would be to change this line to if (stack && stack.indexOf(message) === -1) {.

[mk-conn]

The Ember version is 2.12.1. I will try to create a PR ...