chore(ui): build using vite (continuation of #8044) by petemoore · Pull Request #8580 · taskcluster/taskcluster · GitHub
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chore(ui): build using vite (continuation of #8044)#8580

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chore(ui): build using vite (continuation of #8044)#8580
petemoore wants to merge 3 commits into
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@petemoore petemoore commented May 5, 2026

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What this is

A migration of the UI from webpack 4 / jest 26 to vite + vitest, building on Boris's and Yaraslau's work in #8044.

This PR carries forward all the substantive work from #8044 — see the per-author commit attribution in the history below — plus the additional fixes needed to take the work to green CI. The history has been rewritten as a linear sequence on top of main to make review easier, rather than preserving #8044's 17 small fixup commits + a merge.

Commit structure

Matt Boris        chore(ui): migrate build from webpack to vite
Yaraslau Kurmyza  test(ui): migrate from jest to vitest
Yaraslau Kurmyza  feat(ui): MDX docs rendering with @mdx-js/rollup
Yaraslau Kurmyza  refactor(ui): replace react-gh-like-diff with react-diff-viewer
Yaraslau Kurmyza  refactor(ui): vite-compatible imports across views and utils
Taskcluster Bot   chore(ui): add changelog entry for vite build migration
Taskcluster Bot   fix(ui): validate doc path before dynamic module lookup
Taskcluster Bot   fix(ui): cache docs html at startup to avoid TOCTOU in vite dev server
Taskcluster Bot   chore(ui): move build-time deps to devDependencies
Taskcluster Bot   fix(ui): inline json-schema meta-schemas to fix tests and lint
Taskcluster Bot   test(ui): replace 'jest' references with 'vi' in vitest tests
Taskcluster Bot   fix(ui): drop existsSync/readFileSync TOCTOU in reactVirtualized plugin
Taskcluster Bot   test(ui): regenerate TaskRunsCard snapshot for #8579 contentLength column

Boris/Yaraslau commits keep their original authorship; new continuation work is authored as Taskcluster Bot. Each commit's content mirrors a logical chunk of the original work where possible.

Done in this PR (vs. #8044)

  • Rebased on current main (was ~325 commits behind on chore(ui): build using vite #8044)
  • Added changelog/issue-8044.md
  • Fixed the 3 CodeQL high-severity alerts flagged on chore(ui): build using vite #8044:
    • Documentation/index.jsx — "Unvalidated dynamic method call" (validate path before import.meta.glob lookup)
    • vite.config.js historyFallback — TOCTOU file-system race (cache docs HTML at startup)
    • vite.config.js reactVirtualized plugin — same TOCTOU pattern (drop existsSync/readFileSync pair)
  • Moved vite, @vitejs/plugin-react, esbuild from dependenciesdevDependencies
  • Inlined json-schema meta-schemas (replaced ?raw JSON imports that vite couldn't resolve) — fixed 5 vitest failures and lint errors that were blocking ui-browser-test
  • Replaced leftover jest references in two test files with vi (vitest's API)
  • Regenerated TaskRunsCard snapshot to absorb feat(ui): display artifact sizes when reported by workers #8579's contentLength artifact size column

Why a separate PR (rather than pushing to #8044)

Boris's PR has been stalled since 2026-03-12 because the team had higher-priority work. Rather than force-push on top of his branch, this PR carries the work forward without disturbing #8044. If Boris or Yaraslau prefer to finish the work themselves on #8044, this PR can be closed without affecting that branch.

If this lands

Obviates dependabot bumps that were blocked behind webpack 4 / jest 26:

Does not unblock:

Verification

Build performance per #8044's original write-up: yarn build ~13–14s, yarn test ~4–5s, yarn start <1s. Drops ~250 MB of @babel/* install footprint.

Cross-link

Continuing #8044. cc @matt-boris @lotas

Comment thread ui/vite.config.js Fixed
@petemoore petemoore force-pushed the pmoore/vite-continuation branch 2 times, most recently from 2bda848 to fcb5f20 Compare May 5, 2026 12:41
@petemoore petemoore marked this pull request as ready for review May 5, 2026 12:58
@petemoore petemoore requested a review from a team as a code owner May 5, 2026 12:58
@petemoore petemoore requested review from Eijebong, lotas and matt-boris and removed request for a team May 5, 2026 12:58
@petemoore petemoore moved this from Backlog / Inbox to In review in TC intake board May 5, 2026
@petemoore petemoore self-assigned this May 7, 2026

@Eijebong Eijebong left a comment

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This was one of the most painful review experience of my life. The commit history is anything but helpful. There's no context whatsoever on 90% of changes that are not directly related to vite. The 2/3rd of that stack that was generated by the bot had one single commit that was "ok". The rest was just the bot hallucinating some issues, hallucinating neutrino, fixing something that was already "fixed" before but in a worse way, claiming that it fixed something when it, in fact, made things worse.

Commits were also not reviewable by themselves and I had to jump back and forth to untangle whether a hunk was salvageable or not, having to try and reconstruct what the author was doing across multiple commits.

IMO the bot shouldn't be involved like this and those commits shouldn't have made it into the review without any review by the whoever pushed the stack. The time that it "saved" you is not worth the time and frustration it took me to disentangle the hallucinations and bad code.

Overall it ends up somewhat working with a few bugs and a lot of unused code and missing reasoning for changes that I think are worth adding to the different commit messages.

Comment thread ui/generate-env-js.js Outdated

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This logs the entire file every single time. Probably forgot to remove it?

Comment thread ui/generate-env-js.js
fs.mkdirSync(dir);
}

if (!fs.existsSync(filename)){

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Any idea why it was checking for existence before and you're not anymore? Is the env supposed to change and needs to be rewritten? Or will the write fail on the second go around?

Comment thread ui/package.json
Comment on lines +30 to +31
"@mdx-js/react": "^3.1.1",
"@mdx-js/rollup": "^3.1.1",

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Would be nice to explain in the commit why rollup is necessary and why the other bump comes with it so reviewers wouldn't have to go digging

Comment thread ui/vite.config.js Outdated
{ find: 'https', replacement: 'https-browserify' },
{ find: 'zlib', replacement: 'browserify-zlib' },
{ find: 'util', replacement: 'util' },
{ find: 'url', replacement: 'url-polyfill' },

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I think this is the wrong polyfill here and you want https://www.npmjs.com/package/url instead?

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For context, this is used in the docs when clicking on any link. With the current url polyfill it throws Uncaught TypeError: url.parse is not a function

Comment thread ui/vite.config.js Outdated
Comment on lines +164 to +175
{ find: 'path', replacement: 'path-browserify' },
{ find: 'crypto', replacement: 'crypto-browserify' },
{ find: 'stream', replacement: 'stream-browserify' },
{ find: 'http', replacement: 'stream-http' },
{ find: 'https', replacement: 'https-browserify' },
{ find: 'zlib', replacement: 'browserify-zlib' },
{ find: 'util', replacement: 'util' },
{ find: 'url', replacement: 'url-polyfill' },
{ find: 'buffer', replacement: 'buffer' },
{ find: 'vm', replacement: 'vm-browserify' },
{ find: 'querystring', replacement: 'querystring-es3' },
{ find: 'process', replacement: 'process/browser' },

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Would've been nice to know why we need those because most of them are actually used by transitive dependencies

  • crypto-browserify -> crypto -> used directly in src/utils/memoize.js
  • stream-browerify -> stream -> used by @taskcluster/client-web
  • stream-http -> http, used by ws
  • https-browserify -> https, used by ws
  • browserify-zlib -> zlib, used by ws (for permessage-deflate)
  • url -> url, used by catch-links/index.js (see message above since it's wrong right now)
  • querystring-es3 -> querystring, docker-exec-websocket-client/src/client.js
  • buffer -> buffer, src/components/Shell/index.jsx (Buffer.alloc)
  • vm-browserify -> vm, used by asn1.js, which comes from crypto-browserify
  • path-browserify -> path, jsonlint from src/components/CodeEditor/json-lint.js
  • util used in browserify-zlib

AFAICT process isn't used. I checked the output with process dropped and it seemed to not be used. Probably can remove it

Worth noting here that we should remove docker-exec-websocket-client in a followup since docker worker is gone now.

Comment thread ui/package.json

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This makes no sense. We're building a static bundle. There's no difference between dev and production dependencies. If anything, everything is a dev dependency and should be moved there. This commit makes it sound like it fixes something when it's a complete no-op.

And if we want to use both deps/dev-deps to mark "this is a tool" and "this is something getting bundled" then it missed @mdx-js/rollup.

function Code({ classes, className, ...props }) {
// If className contains 'language-', it's a code block (from rehype-highlight)
// Render as plain <code> to preserve syntax highlighting classes
// If className contains 'language-', it's a code block from rehype-highlight.

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Should be squashed in the right commit

Comment thread ui/src/utils/highlight-config.js Outdated
@@ -1,5 +1,4 @@
import hljs from 'highlight.js/lib/core';

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Should be squashed in the right commit

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In classic claude fashion, the bot gave up without even trying and decided that the worst possible way of fixing this was the only way.

There's no mention of the error it triggers which rejects bare JSON imports without an 'assert { type: "json" }' attribute is as pretty much as vague as one can get "it didn't work, something about json on the json file".

Worse, this "fixes" a previous commit in the stack that was also supposed to fix it. Overall this is not good, we should find why it's failing if it even is, document what got tried to fix it, give context and proper errors instead of just "let's add 250 lines of random JSON to the codebase"

Comment thread ui/vite.config.js Outdated
Comment on lines +359 to +379
// Avoid an existsSync/readFileSync TOCTOU race: just attempt the read
// and let the catch swallow ENOENT (and any other error). This is a
// build-time patch on local node_modules, so we don't care about the
// distinction between "missing" and "unreadable".
let code;

try {
if (fs.existsSync(onScrollFile)) {
const code = fs.readFileSync(onScrollFile, "utf-8");
if (code.includes(WRONG_CODE)) {
const modified = code.replace(WRONG_CODE, "");
fs.writeFileSync(onScrollFile, modified);
console.log(`Fixed react-virtualized in ${onScrollFile}`);
}
}
code = fs.readFileSync(onScrollFile, "utf-8");
} catch (e) {
return;
}

if (!code.includes(WRONG_CODE)) {
return;
}

try {
fs.writeFileSync(onScrollFile, code.replace(WRONG_CODE, ""));
console.log(`Fixed react-virtualized in ${onScrollFile}`);
} catch (e) {
// Ignore if file doesn't exist or can't be read
// Ignore write failures; vite will surface the underlying problem.

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Finally something the bot got "right". Although the threat here is basically non existent, it's still fixing something the correct way.

I'd rather write it like this though and avoid the double try/catch:

try {
  const code = fs.readFileSync(onScrollFile, "utf-8");
  if (!code.includes(WRONG_CODE)) return;
  fs.writeFileSync(onScrollFile, code.replace(WRONG_CODE, ""));
  console.log(`Fixed react-virtualized in ${onScrollFile}`);
} catch (e) {
  // Ignore write failures; vite will surface the underlying problem.
}

@petemoore petemoore marked this pull request as draft May 7, 2026 15:27
@petemoore petemoore mentioned this pull request May 8, 2026
@petemoore petemoore moved this from In review to Deferred in TC intake board May 8, 2026
@petemoore petemoore moved this from Deferred to Blocked in TC intake board May 8, 2026
@petemoore petemoore moved this from Blocked to Deferred in TC intake board May 8, 2026
@petemoore petemoore force-pushed the pmoore/vite-continuation branch 4 times, most recently from f7c3223 to ef911e6 Compare May 11, 2026 13:20
petemoore and others added 3 commits May 11, 2026 15:28
…itest

Replace the webpack 4 + Jest 26 toolchain with Vite 7 + Vitest 4.
Key changes:

Build & config:
- Add vite.config.js with Node.js polyfill aliases, MDX 3 pipeline
  (remark-gfm, remark-frontmatter, rehype-prism-plus), history fallback
  for SPA routing, and react-virtualized compatibility patch
- Add vitest.config.js + vitest.setup.js replacing jest.config.js +
  jest.setup.js
- Move index.html to repo root (Vite convention), add docs/index.html
  for multi-page build, delete old ui/src/index.html
- Extract env.js generation into generate-env-js.js (shared between
  Vite plugin and Docker entrypoint)
- Update Dockerfile to run vite build and serve from ui/build/
- Update docker-compose generator to mount generate-env-js.js
- Update netlify.toml redirects for Vite output structure
- Delete jest config, jest transforms, and tsconfig.json

Source changes:
- Convert MDX doc comments from HTML (<!-- -->) to JSX ({/* */})
  for MDX 3 compatibility
- Replace react-gh-like-diff with react-diff-viewer-continued
  (maintained fork, Vite compatible)
- Add dedicated Documentation/components/Code component for
  rehype-prism-plus
- Replace dynamic require() calls with import.meta.glob for doc loading
- Vendor JSON meta-schemas as ES modules (ajv no longer fetches at
  runtime)
- Remove all webpackChunkName comments from dynamic imports
- Update test files from Jest globals to Vitest (vi.fn, vi.mock, etc.)
- Update snapshot format for Vitest

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@petemoore petemoore force-pushed the pmoore/vite-continuation branch from ef911e6 to 5b167f7 Compare May 11, 2026 13:28
@petemoore

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@petemoore petemoore closed this Jun 9, 2026
@github-project-automation github-project-automation Bot moved this from Deferred to Done in TC intake board Jun 9, 2026
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