Warn when watch mode ignores changed Babel options

[novemberborn]

As per #1702, we can't safely reload Babel options in watch mode. We can, however, try and detect if the Babel options have changed between runs. A warning should be printed so users are aware that an older Babel configuration was applied.

This is blocked on cleaning up the reporter code.

[sindresorhus]

This is blocked on cleaning up the reporter code.

Is it still blocked on this. Can you link to the PR/issue that blocks it?

A warning should be printed so users are aware that an older Babel configuration was applied.

I think it would be better to exit watch mode in that case.

[novemberborn]

Can you link to the PR/issue that blocks it?

I think I closed my own PR due to inactivity 😄

A warning should be printed so users are aware that an older Babel configuration was applied.

I think it would be better to exit watch mode in that case.

Yes, though is it even worth trying to figure out if the Babel options (and / or installed plugins) changed?

[sindresorhus]

Yes, though is it even worth trying to figure out if the Babel options (and / or installed plugins) changed?

It might prevent some weird staleness issues. We don't need to detect what changed, only that something changed in the Babel-related stuff.

[novemberborn]

We're removing Babel from AVA itself. I don't think it's feasible to have change detection across different packages.