* fix(build): pin cssTarget so esbuild preserves `max-width` media-query syntax
Vite's default `build.cssTarget` follows `build.target` (modern evergreens),
which lets esbuild's CSS minifier rewrite `@media (max-width: 768px)` to
the Media Queries Level 4 range syntax `@media (width <= 768px)`. Both
forms are semantically equivalent in modern browsers, but the rewrite is
observable to user code that inspects `cssText` on `CSSMediaRule`s and
breaks tools that pattern-match the raw query string. Next.js's CSS
pipeline (webpack + cssnano, or lightningcss only when opted in via
`experimental.useLightningcss`) preserves the original syntax by default,
so user code carried over from Next.js can break when migrating to vinext.
Pin `build.cssTarget` to ["chrome87", "edge88", "firefox78", "safari15"],
which predate Safari 16.4 — the first browser to support MQ Level 4 range
syntax. esbuild checks the configured target and skips lowering when any
target is too old. Only literal media-query syntax is affected; matching
behavior at runtime is unchanged.
Mirrors the Next.js fixture
test/e2e/app-dir/css-media-query/css-media-query.test.ts which asserts
`cssText` preserves `max-width: 768px`.
Tests:
- New tests/css-media-query-target.test.ts builds a minimal fixture
and asserts the produced CSS asset contains `max-width: 768px` and
does not contain `width<=768px`. Fails without this change; passes
with it.
- All existing CSS / SCSS / build-optimization / nextjs-compat app-css
tests continue to pass.
* refactor(build): narrow cssTarget to only pin Safari low
Address review feedback on #1310. Only Safari needs to be pinned to a
version that predates MQ Level 4 range syntax (Safari 16.4) so esbuild
skips the @media (max-width: …) → @media (width <= …) rewrite. The other
targets were pinned far older than necessary, which caused esbuild to
downlevel unrelated modern CSS features (`:is()`, CSS Nesting, `lab()`,
`oklch()`, gradient interpolation, etc.).
Bumps chrome/edge/firefox targets to ~2023 baselines while keeping
safari15 to retain the MQ rewrite fix.
James Anderson