How to disable strict mode while bundling React using webpack

If you're seeing that error then most likely you've got somewhere in your codebase where you're declaring multiple properties on the same object. Disabling the alarm bell just fixes the symptom.

I've found this error to pop up if I declare duplicate properties in my JSX, e.g. when doing <MyComponent className="foo" onClick={onClick} className="foobar" /> or accidentally duplicating some other property.

Find and fix the actual error instead of just suppressing the error message. IE should tell you what line it's happening on and it shouldn't be too hard to look at what's there and figure out which component has the problem.

Check out this package: https://www.npmjs.com/package/babel-plugin-transform-remove-strict-mode

I was looking for a convenient way to get rid of the 'use strict' and it seems to be doing just that.