Add ES array methods as cause of Phantom.js errors.
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@ -224,13 +224,18 @@ For our currently-supported browsers, see our [requirements][requirements].
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[scss-style-guide]: scss_styleguide.md
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[scss-style-guide]: scss_styleguide.md
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[requirements]: ../install/requirements.md#supported-web-browsers
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[requirements]: ../install/requirements.md#supported-web-browsers
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## Common Errors
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## Gotchas
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### Rspec (Capybara/Poltergeist) chokes on general JavaScript errors
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### Phantom.JS (used by Teaspoon & Rspec) chokes, returning vague JavaScript errors
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If you see very generic JavaScript errors (e.g. `jQuery is undefined`) being thrown in tests, but
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If you see very generic JavaScript errors (e.g. `jQuery is undefined`) being thrown in tests, but
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can't reproduce them manually, you may have included `ES6`-style JavaScript in files that don't
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can't reproduce them manually, you may have included `ES6`-style JavaScript in files that don't
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have the `.js.es6` file extension. Either use ES5-friendly JavaScript or rename the file you're
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have the `.js.es6` file extension. Either use ES5-friendly JavaScript or rename the file you're
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working in (`git mv <file>.js> <file.js.es6>`).
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working in (`git mv <file.js> <file.js.es6>`).
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Similar errors will be thrown if you're using
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any of the [array methods introduced in ES6](http://www.2ality.com/2014/05/es6-array-methods.html)
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whether or not you've updated the file extension.
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