Summary:
When running in strict mode we run into the following error:
“Cannot assign to read only property 'product' of object '#<WorkerNavigator>’”
Moreover navigator.product = ‘ReactNative’; didn’t actually change the product value. Without strict mode this was silently ignored.
By using our defineProperty function we are able to run in strict mode and now navigator.product is really ReactNative.
See https://github.com/facebook/react-native/issues/10881 for more information
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Long story short - if we run in strict mode, the current code throws an error :
`Cannot assign to read only property 'product' of object '#<WorkerNavigator>' initializeCore.js`
(the current version of initializeCore.js doesn't have 'use strict'; on top, but if you are unfortunate enough to have a babel module that ads this for you, you are guaranteed to run into this. Moreover our contributing guidelines say that we should have 'use strict'; https://github.com/facebook/react-native/blob/master/CONTRIB
Closes https://github.com/facebook/react-native/pull/11057
Differential Revision: D4219958
Pulled By: javache
fbshipit-source-id: 35568b2ce4b87fff1aa8248f067d49e5f9f9e9a2
ad36c1af71