BUG: Pin preact and friends using ~ rather than ^.

[ssanderson]

The most recent release of preact-compat appears to have broken notebook.

Fixes #4680.

[lresende]

Do we know what in the new release of preact is causing the issues in Notebook? Should we actually look into making it compatible for the 6.0 release or folks think that the pin might be a good option for now? @minrk @blink1073

[blink1073]

I'd say pin for now, I'm not as familiar with the frontend parts of this repo.

[ssanderson]

I'm not super familiar with javascript packaging generally, but it looks to me like what happened is that the latest release of preact-compat added a new createContext method, which added a new dependency on preact-context, which we're not picking up properly.

I'm 100% spitballing here, but my guess is that the failure to pick up preact-context is related to the fact that we're using bower for package management, which doesn't know about the transitive dependencies of preact-compat (presumably b/c they don't have a bower.json?).

Assuming the above is correct, what this probably means is that any change that adds a new dependency to any of our bower-unaware dependencies (my guess is that's increasingly the majority of modern js projects given that bower seems to be EOL) will end up being a breaking change for us for as long as we're using bower to manage dependencies.

[lresende]

LGTM for now as discussed above.