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Summary
This PR added defaultProps & a few adjustments how Preact handles undefined properties in cloneElement. Currently, any properties in props would be used to override normalizedProps in Preact without any checks. However this is being handled differently in React where there will be a check in place to skip the override when config[propName] (props[i] in our case) is undefined.
Issue
Check these 2 code sandbox, the component's color should not be override by an undefined property:
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This is a great catch! I wasn't aware that defaultProps play a role for cloneElement. Love the codesandbox comparisons and that you already included a test case in your proposed changes. This is a fantastic PR!
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Summary
This PR added
defaultProps
& a few adjustments how Preact handles undefined properties incloneElement
. Currently, any properties in props would be used to override normalizedProps in Preact without any checks. However this is being handled differently in React where there will be a check in place to skip the override when config[propName] (props[i] in our case) is undefined.Issue
Check these 2 code sandbox, the component's color should not be override by an
undefined
property: