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build: migrate to vite 8 - #39
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The bundler now runs Rolldown and Oxc, and Lightning CSS is the CSS minifier by default. The whole gate order is green locally: coverage at 100 on statements, branches, functions and lines, typecheck, lint, format check, build, the bundle guard, the toolchain guard and the browser sweep. Output moves slightly and in the expected direction. The JavaScript chunk drops from 213,806 to 211,278 bytes, the stylesheet rises from 8,328 to 8,370, and the dataset asset is byte-identical with the same content hash. The vendor prefix set in the emitted stylesheet is empty before and after, so autoprefixer's decisions under the frozen browserslist are untouched. The lockfile diff is large because 26 esbuild platform packages, esbuild itself and rollup leave the tree. Net movement is a reduction.
The default-import rule for CommonJS modules changed in this bundler major. The tree was measured against it rather than assumed inert: the manifest declares the module type, the two packages default-imported from CommonJS neither of them mark themselves as ES modules, and the pre-bundled set holds nothing that is default-imported at all. Both branches of the rule point at the same value, so the deprecated opt-out stays unset and the reason now sits beside the config instead of in a planning note.
The header gave two reasons for opting out of the DOM environment. The first belonged to the transform tool the bundler no longer uses. It was measured in both directions rather than reasoned about: with the pragma deleted the run fails on Vite 7.3.6 and passes on Vite 8, so the reason was live until this bump and is dead now. It goes, and the count sentence goes with it.
The updater no longer holds back either major. The bundler is on 8.x and the react plugin's hold was only ever a consequence of that one, so both entries go together. The prose above the list now describes the two holds that actually remain, one decision and one wait, and the false claim about the plugin's optional peers moves to the build config where it has effect.
The plugin is pinned at an exact 6.1.0 and taken bare. Its three peers other than the bundler are all optional and none is installed, so what is declined is an experimental compiler adoption rather than a faster JSX transform. The JSX transform now comes from the plugin itself, which is why this major drops Babel, its type package, both JSX plugins and the refresh runtime out of the tree instead of adding to it. The decision sits beside the plugin call. Every gate is green, coverage still 100 on all four metrics, and the emitted artifacts are byte identical to the run before it.
Each of these was checked against this tree rather than carried forward. The interop note named axe-core and postcss as the pre-bundled set, but the optimizer output holds react, react-dom, the DOM client entry, the two icon subpaths and the two JSX runtimes, and neither test-only package appears there at all. It also called postcss CommonJS-resolved when its exports map sends the import condition to lib/postcss.mjs. The plugin note said the major drops Babel out of the tree; react-refresh did leave, but @babel/core is still here through the lint plugin and was here before the bump. The bundle guard's header promised a surviving reason for the node pragma and then gave a paragraph about the environment variable instead, and the file passes with the pragma deleted, so the header now says that plainly and drops the size claim that measured under the figure it stated.
…omments The interop note opened its test-file paragraph by counting two, which is wrong however it is read: ten files default-import a bare specifier, across three packages, and user-event is a third test-only package absent from the pre-bundled set for the same reason postcss is. The count carried no weight, so it is gone and the two package sentences after it carry the paragraph as they already did. The bundle guard's header said the pragma buys the setup cost it in fact avoids paying.
They are not externalized to Node in every mode. A browser project run leaves axe-core and user-event bundled in its own deps directory, so the previous clause was false there. What is true in both modes is that the app optimizer scans the entry graph and never reaches the test files, which is the reason the set looks the way it does.
…easure Both figures beside the constant had drifted off the tree. The ceiling is a little over twice the real chunk, not roughly 3.3 times it, and a re-bundled regression comes out at 3,465,301 bytes, so the ceiling is about a seventh of one rather than 23 times it. Measured by building once as shipped and once with the dataset value-imported. The constant itself is unchanged and still sits between the two with room on both sides.
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Included review availability: 2 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 4 reviews per hour. 📝 WalkthroughWalkthroughThe project upgrades Vite and its React plugin, changes TypeScript module resolution to ChangesVite toolchain update
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to This PR migrates the build to Vite 8 and updates dependency automation; the current configuration may allow coupled Vite packages to receive standalone major-version updates that fail dependency resolution before CI tests run. The PR is otherwise mergeable with owner awareness of keeping those updates coordinated. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In @.github/dependabot.yml:
- Around line 40-53: Update the Dependabot configuration to add a major-only
group containing vite and `@vitejs/plugin-react`, so their major updates are
proposed together. Preserve the existing ignore rules, including the eslint and
typescript entries.
In `@package.json`:
- Line 47: Set Vite’s build.target explicitly in the Vite configuration to
include Firefox 111, rather than relying on Vite’s newer baseline default; keep
the project’s existing browser support and other build settings unchanged.
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The bundler does not read the browserslist field, so the two have always been free to drift and now have: the default target is baseline-widely-available, which is Firefox 114 against a declared floor of 111, while the other three floors agree exactly. Spelling the four out pins the floor rather than changing anything, since a build on these targets and a build on the default produce the same chunk down to its content hash. Nothing asserts the two lists agree, so the comment says to update them together.
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The build target section told a maintainer that raising the baseline is an edit to the browserslist and the date. There is a second list now, build.target in the bundler config, and the two govern different things: the browserslist decides vendor prefixes, the target decides syntax lowering. Someone raising the floor from the old instruction would have moved one and left the other behind.
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Migrate to Vite 8 including necessary dependency updates.
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