integrate into an existing project page was broken.

[HotWordland]

I use react-native init create a project app and everything be all right.

then I pack a main.jsbundle .I want to integrate into an existing project and install all the dependencies.

Then I find that the page is broken by running main.jsbundle.

Is it because of some configuration reasons for the project? I tried to adjust some project configuration information, but it has no effect.

Environment:
react-native 0.59.9 XCode10.2.1

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