[Discussion]Should the apps stop instantiating when show/hide the dom?

[horrylala]

Description

1.Why should the app return a component instance when matched(no mater match path or always alive).

return children && !isEmptyChildren(children)
      ? children
      : matchAnyway
      ? component
        ? componentInstance
        : render
        ? render(props as any)
        : null
      : null

In my opinion, from hide -> show, the very only method is performing SHOW_DOM.But in fact , when i use return null, it will not show or hide dom, but destroyed the dom.

if (matchOfPath) {
      debugLog('--- normal match —‘)
     //***//
    } else {
      debugLog('--- hide match ---')
      // force unmount

      // show ➡️ hide
      if (this.liveState === LiveState.NORMAL_RENDER_MATCHED) {
        this.currentSideEffect = [SideEffect.ON_HIDE_HOOK, SideEffect.SAVE_DOM_SCROLL, SideEffect.HIDE_DOM]
      }
      this.liveState = LiveState.HIDE_RENDER
      **return null**
    }

2.Why should the app instantiate with props using 'match: matchOfPath'?
What does it used for? I use 'this.props' instead of 'props', it still works.

    // normal render
    const props = { ...context, location, match: matchOfPath, ensureDidMount: this.getRouteDom }
    const componentInstance = component && React.createElement(component, props)