"react hot loader got: ... in ..."

[natew]

I'd like to debug this, but think first step is making this error message a bit more clear. I'm pretty confused what's happening and why. I'd be happy to add some messaging here once I can understand a bit.

Description

Getting this error:

What you are reporting:

Expected behavior

Should report why it's happening, steps to fix potentially, and show a bit better information.

Actual behavior

Imprecise message.

Environment

React Hot Loader version: 4.6.5

[theKashey]

got XXX instead of YYY and where. Usually, it would re-render the nested tree with a state loss.

This is from hot-renderer, when something went unpredictable, and after update XXX is not (new)XXX, but YYY. Memo vs SFC in this case.

For the message is clear, but the formatting is not quite. Probably I should pick something more console friendly.

[natew]

In this case I’m not changing anything like memo to sfc just editing the thing directly. Is it potentially a bug then?

[theKashey]

Definitely. Could you parse a code around

<SomeProvider>
  <AndSomethingInsideProbablyMemoVersionOfChangeThemeByName/>
</SomeProvider>

[theKashey]

Confirmed. The issue is with React 16.7+, where fiber.elementType is Memo, but fiber.type is memo-ed component.

[theKashey]

There were 2 mistakes:

• memo was not properly supported in hot-render, that's why you saw this message
• reloading Providers was not supported at all. In all the tests they were created above reloading point.