dillon1000/react

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Add React.isValidElementType() (#12483)

* Add React.isValidElementType()

Per the conversation on #12453, there are a number of third-party
libraries (particularly those that generate higher-order components)
that are performing suboptimal validation of element types.

This commit exposes a function that can perform the desired check
without depending upon React internals.

* Move isValidElementType to shared/
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James Reggio authored 96fe3b1be2fe74e83c9a25d7511f23dbef15ac99 Parent 125dd16
Changed paths4 files
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M packages/react-is/src/ReactIs.js ModifiedM packages/react-is/src/__tests__/ReactIs-test.js ModifiedM packages/react/src/ReactElementValidator.js ModifiedA packages/shared/isValidElementType.js Added
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