heading styles broke after upgrade to RN 0.57.4

[a-sandris]

Not sure if it is just me but applyStyle.js check for display name child.type.displayName === type is broken, because displayName is undefined always.

Possible check would be -> child.type.displayName === type || child.type.render.name === type

[cseelus]

Same problem here with Expo 31 using RN 0.57.7. Would a PR be accepted?

[gimoteco]

You can workaround it while the pull request doesn't get merged into master creating a custom rule

like

const rules = {
  heading2: (node, children, parent, styles) => {
    return (
      <YourCustomComponent key={getUniqueID()}>
        {children[0].props.children}
      </YourCustomComponent>
    )
  },
}

<Markdown rules={rules}>
   {markdownText}
</Markdown>