Storybook: Storybook 5 doesn't seem to render in IE 11

[piperchester]

Describe the bug
Not sure if this is a known bug already (didn't see it as a pre-existing issue) but we don't see our Storybook rendering in IE 11.

We suspect it's related to Object.assign not being transpiled somewhere: https://github.com/storybookjs/storybook/search?q=Object.assign&unscoped_q=Object.assign

Opening to see if others have experienced this issue, or if it's likely a problem that's locally scoped to our setup.

To Reproduce
Launch Storybook ^5 in IE 11.

Expected behavior
Storybook renders.

Screenshots

System:

• OS: Windows 10
• Browser: IE 11
• Framework: React
• Version: ^5.0.11

[piperchester]

Closing this out -- it looks like an issue with our local setup. Apologies for any unwarranted FUD!

[shilman]

@piperchester relieved to hear that! 😅

[Badlapje]

If anyone else has this issue and winds up here: for us it was the usage of an arrow function in our config.js. We solved it by changing it to the below (the function in the forEach was the arrow function before).

function loadStories() {
  req.keys().forEach(function(filename) {
    req(filename)
  });
}

[binomialstew]

@piperchester, what was your local issue? We're seeing the same error in IE11 and think your solution might shed some light.