fix(js_formatter): array printing and grouping in arrows #917
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Summary
This fix is largely just pulled straight from astral-sh/ruff#6815, which adds a reset to the
PrintModefor a group whenever it has to get remeasured. The linked PR has a more thorough description, but without this, a group that gets measured, realizes it doesn't fit, and then gets remeasured will always assume that it must print asExpanded, because the previous measuring will have failed to fit. This just resets that mode toFlatbefore attempting to remeasure, ensuring that it will try to fit on a single line first in whatever new context it's being printed in.The other small change in this PR is allowing
JsArrayExpressionto start of the same line when used as the single expression body of an arrow function, like:Previously, the opening bracket would be forced onto a newline, which didn't match the existing behavior for objects, sequences, or block statement bodies.
All of this is starting an attempt to fix
prettier/js/arrows/curried, but that's proven to be far more complicated.Test Plan
The two snapshot changes show the new diff, reducing incompatibilities with Prettier.