RFC: ReactInstrumentation.debugTool.onSetHostNode(debugID, node)

[gaearon]

We will need a way to get host nodes in React DevTools with the new API. We currently get them by reaching into ReactDOMComponentTree directly but I propose to transition to using devtool API (#5306) for this so that other renderers can provide their own host nodes when they become available.

I propose that the renderer code would emit something like

if (__DEV__) {
  ReactInstrumentation.debugTool.onSetHostNode(inst._debugID, node)
}

when node becomes associated and

if (__DEV__) {
  ReactInstrumentation.debugTool.onSetHostNode(inst._debugID, null)
}

when it is deassociated.

For DOM renderer, it would happen here.

Then we would add getHostNode() to ReactComponentTreeDevtool that would handle onSetHostNode event.

Does this sound reasonable? Longer term it would make something like this possible in userland.

[jimfb]

Sounds reasonable to me, but how are you going to fire it for SFCs when it becomes disassociated?

[gaearon]

It would only be called for DOM components. React DevTools would then use the ReactComponentTreeDevtool to establish the closest (DOM) component with a host node.