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Add ES array methods as cause of Phantom.js errors.

## What does this MR do?

Adds another example of something that causes a common error in JavaScript testing to the frontend dev docs.

See merge request !7102
This commit is contained in:
Fatih Acet 2016-10-31 22:33:34 +00:00
commit 75d15be9b2
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doc/development/frontend.md
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@ -238,13 +238,18 @@ For our currently-supported browsers, see our [requirements][requirements].
[scss-style-guide]: scss_styleguide.md
[requirements]: ../install/requirements.md#supported-web-browsers
## Common Errors
## Gotchas
### Rspec (Capybara/Poltergeist) chokes on general JavaScript errors
### Phantom.JS (used by Teaspoon & Rspec) chokes, returning vague JavaScript errors
If you see very generic JavaScript errors (e.g. `jQuery is undefined`) being thrown in tests, but
can't reproduce them manually, you may have included `ES6`-style JavaScript in files that don't
have the `.js.es6` file extension. Either use ES5-friendly JavaScript or rename the file you're
working in (`git mv <file>.js> <file.js.es6>`).
working in (`git mv <file.js> <file.js.es6>`).
Similar errors will be thrown if you're using
any of the [array methods introduced in ES6](http://www.2ality.com/2014/05/es6-array-methods.html)
whether or not you've updated the file extension.