Use `baseline widely available` query in browserslist
@LeoMcA is already working on this.
Since Apr 13, 2026.
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Description
From @pepelsbey on Slack:
The Browserslist package we use in fred to specify supported browsers now natively supports Baseline since the last release:
https://github.com/browserslist/browserslist/pull/903
So instead of my naive approach we can say “baseline widely available” in the config.
I'd like us to do a quick before/after rspack diff to ensure nothing changes: I'm not entirely sure how the query gets resolved by our top level browserslist dependency and if we have to wait for build dependencies to update to the latest version - but a diff will tell us for sure.
Setting as p1 for now because I think we don't want to lose this to the backlog, and should be relatively trivial.
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