react-media-match

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It's possible to render a "predicted" target during SSR, but the guess might be incorrect. In order to "fix" we have to render everything twice:

• first with predicted target, to match SSRed markup
• next with the real target, where some pieces of Application could be rendered a bit differently. And that has a cost.

Proposal

• MediaMatches might partial hydrate their children, in order to keep existing HTML if targets do not match, and update with a proper markup later.
• that would reduce the amount of work React has to do.
• MediaServerRender can do it automatically for a whole application as well.

Should be safe due to a top-level matches provider, which can orchestrate everything below it.

Alternatively

• expose "couldUseHydration" function, which will propose to use render in case of hydration will lead to a double rendering. It's way faster to drop HTML and render ReactComponent, than to hydrate twice.

Don't forget about #11 - almost the same (but the opposite). #36 and #11 could play very nicely together.