Gatsby: [plugin-preact] Update to use Preact X (preact/compat)

[madeleineostoja]

Description

Preact 8.x is incompatible with reach router and errors out on Gatsby v2 (see #8545). Preact X includes compat for contexts and other React 16 features needed by Gatsby, and has moved the compat module to core. This plugin should use that, even though it's currently in alpha, since the current implementation is broken.

Just a matter of updating alias refs from preact-compat to preact/compat and requiring a peer dep of preact ^10.0.0.

Steps to reproduce

Use gatsby-plugin-preact with Preact 10 alpha

Expected result

It should work

Actual result

It doesn't

[wardpeet]

@seaneking as a preact core member, it's on my list to update the plugin and make sure Gatsby works. I'm a bit swamped with other priorities right now but feel free to pick this up.

[madeleineostoja]

@wardpeet great to hear! I tried using Preact X locally, but seems there's still incompatibilities with react router and contexts. So guess we'll have to wait for more bugs to be ironed out during the alpha

[gatsbot[bot]]

Hiya!

This issue has gone quiet. Spooky quiet. 👻

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[madeleineostoja]

I think this should be kept open until Preact X is compatible with Reach router (and therefore Gatsby) and can be used again with this plugin. The beta rewrite may have fixed the issues I saw last time I tried, will try again when I get a chance.