fix(lint): move the exhaustive-deps suppression out of the source - #328
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Storybook play functions asserted and nothing executed them: build-storybook
proves they compile, *.stories.tsx is excluded from coverage, and Vitest
collects *.{test,spec}.* only. Roughly 340 assertions across 656 stories read
as tests to every reviewer while being unable to fail.
Settle the question the change document asks: stories are gate-grade. The
runner is portable stories inside the Vitest suite that already runs, not a
browser job — composeStories with the real .storybook/preview annotations, so
nothing about a story changes to be testable. Measured price, three paired
full-suite runs: the file costs ~9s of CPU and is one worker among 253, so the
suite's wall clock rises by under a second in steady state.
The first run surfaced 23 failures. Ten were wrong assertions, now corrected:
six where MediaPlayerCard's transport() helper read every pill on the card and
the mute toggle broke each exact list, one asserting a weather emoji retired
along with getConditionEmoji, one asserting ON where the spec gives the primary
slot to the preset, one expecting a state-driven switch to flip against a mock
that pushes no state back, one racing a badge outside its own waitFor. Five
measure rendered geometry jsdom cannot lay out and are named in a
self-verifying BROWSER_ONLY map — each still executes, and must still throw
with the message its entry pins. Seven were the runner's own gap, closed by
reproducing the workshop's camera-readiness substitution and answering for its
frames from the workshop's own static directory. One was the process-wide
dispatch guard admitting a later identical command as a success after a story
left one in flight.
Implements PR 6 of docs/changes/0040-test-harness-reliability.md, and records
PR 7 there: the rule PR 3 installed is still blinded in two src/theme story
helpers by a blanket exhaustive-deps suppression, which the React compiler
reads as a whole-function bail.
…ed distinction has a witness
An inline eslint-disable-next-line react-hooks/exhaustive-deps is read by the React compiler as "the author knows they are breaking the rules of React", so it bails on the entire enclosing function and every compiler-backed rule goes quiet with it — react-hooks/set-state-in-effect, at error here, included. Two theme-workshop hooks carried one, which left both functions unanalysable: a future violation beside their deliberate effects would have landed unreported, and the blind spot is self-concealing, because an explicit suppression inside a bailed function reads afterwards as an unused directive. The task line proposed replacing the blanket comment with an explicit set-state-in-effect one; that would not have worked. With the directive removed the rule reports nothing on either hook — both writes go through an updater that bails when nothing changed — so the explicit suppression would have been unused, and what the comment was really silencing is exhaustive-deps itself, which is the directive that causes the bail. No inline form both silences the warning and leaves the function analysable. So the suppression moves into eslint.config.js, scoped to the two files by name. A config-level off is invisible to the compiler, so it suppresses exactly the rule it names. effectHookLintGate pins both halves: a fixture pair differing only by the comment, where the suppressed one is silent and the plain one reports at error, and a scan of every tracked source file under src/ requiring zero inline directives — with its needle built from two string pieces so the spec is not exempt from its own rule. Completes PR 7 of docs/changes/0040-test-harness-reliability.md and closes the change.
The source scan proves the directives are gone; it says nothing about what replaced them. Turning set-state-in-effect off for those files in the config, or dropping the override entirely, both leave it green — so assert the resolved config per file: exhaustive-deps off, set-state-in-effect still error.
…ing git The substring scan matched one spelling and would have read a block directive, the -line suffix or a multi-rule list as clean — the same shape of hole as the member-call form PR 3 fixed. It is a pattern now, and the spec is inside its own scan: the docblock may not spell a directive out, and the fixture's is built at runtime. The file list comes from a Node walk rather than git ls-files: removeFixtureDir tolerates git being unavailable on purpose, and a merge-blocking scan that required a subprocess would be unrunnable wherever process creation is restricted.
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📝 WalkthroughWalkthroughThe change documents the React hooks lint-suppression policy, applies a targeted ESLint override to two theme stories, removes inline suppressions, and expands lint-gate tests to enforce repository-wide and resolved-config behavior. ChangesReact hooks lint suppression policy
Estimated code review effort: 3 (Moderate) | ~20 minutes Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Pull request overview
This PR completes change 0040-test-harness-reliability PR 7 by removing inline react-hooks/exhaustive-deps suppression comments from two theme Storybook helpers and moving the suppression into eslint.config.js to avoid React compiler whole-function bailout. It also extends the lint-gate test to pin the new policy (no inline directives under src/, and correct per-file ESLint overrides) and flips the 0040 change/document indexes to complete.
Changes:
- Move
react-hooks/exhaustive-depssuppression fortokens.stories.tsxandcustomCss.stories.tsxfrom inline directives to a file-scopedeslint.config.jsoverride. - Expand
effectHookLintGate.test.tsto (a) prove the bailout mechanism via a fixture pair, (b) scansrc/for inline exhaustive-deps directives, and (c) assert resolved per-file ESLint rule severities. - Close change 0040 by updating
docs/changes/0040-*,docs/index.yml, anddocs/index.md, plus recording the rule inAGENTS.md.
Reviewed changes
Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| src/theme/tokens.stories.tsx | Removes inline exhaustive-deps directive and documents config-based suppression rationale. |
| src/theme/customCss.stories.tsx | Removes inline exhaustive-deps directive and documents config-based suppression rationale. |
| src/tests/effectHookLintGate.test.ts | Adds fixture pair + source scan + resolved-config assertions to pin the “no inline directives” policy and correct override behavior. |
| eslint.config.js | Adds a narrowly scoped override disabling only react-hooks/exhaustive-deps for the two Storybook helper files. |
| docs/index.yml | Marks change 0040 as complete. |
| docs/index.md | Marks change 0040 row as complete. |
| docs/changes/0040-test-harness-reliability.md | Marks change as complete and updates PR 7 task/outcome text to match the implemented approach. |
| AGENTS.md | Documents the “never inline-disable exhaustive-deps; use config override” rule and its rationale. |
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…iles with a planted violation The scan matched only a directive starting immediately after // or /* with optional whitespace, so a /** opener and a multi-line block comment — both spellings ESLint honours — read as clean. It now extracts each comment and looks for the suppression inside it, in any order and across however many lines the comment spans. Scoping to comments also removes the self-match problem by construction: the patterns are code, so they cannot match themselves. The stronger claim replaces a comment that overstated: eslint.config.js said the spec proves a planted setState in either hook is reported, and nothing linted those files. It does now, through lintText with filePath so the plant never touches the disk — stories.test.tsx imports both, and mutating them mid-run would race a parallel worker. Both directions asserted: the file as it stands reports nothing, the planted copy reports at error.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #328 +/- ##
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Coverage 88.36% 88.36%
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Files 233 233
Lines 8476 8476
Branches 2852 2852
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Hits 7490 7490
Misses 788 788
Partials 198 198 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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A file-level /* eslint-disable */ names no rule and so slipped the scan, while suppressing every rule ESLint would report in that file — set-state-in-effect included. Measured while adding it: that is in fact the ONLY directive form which silences the rule at all. Every named next-line spelling leaves it reporting, because its report lands on a line the directive does not cover, so what the named forms actually defeat is the React compiler's analysis rather than ESLint's suppression. Two mechanisms, one outcome, and the scan now rejects both shapes. Generated files are excluded by suffix. isPathIgnored was tried first and answers false for src/routeTree.gen.ts: the config's ignores entry is '*.gen.ts', and a bare * in a flat config does not cross /, so it matches nothing under src/. That file is lint-clean only because of its own blanket disable.
…nchor /* eslint-disable -- reason */ names no rule and still disables everything; ESLint's description syntax is the same directive wearing an explanation. The planted-violation guard checked the two replacements' combined effect, so a drifted useEffect anchor with the useRef one still matching would have produced an unused useState and no write — and 'the rule did not report' would then read as a regression in the rule rather than as a moved anchor.
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Summary
Completes PR 7 of
docs/changes/0040-test-harness-reliability.md— "Un-blind the rule in the two files that still suppress it" — and closes the change: it was the last task, so**Status:** draft→complete,status: draft→completeindocs/index.yml, and thedocs/index.mdrow all flip here.src/theme/tokens.stories.tsxandsrc/theme/customCss.stories.tsxeach carried a blanketeslint-disable-next-lineforreact-hooks/exhaustive-deps. The React compiler reads that directive as "the author knows they are breaking the rules of React" and stops analysing the entire enclosing function, so every compiler-backed rule goes quiet with it —react-hooks/set-state-in-effect, which this repo enforces aterror, included. Neither effect is a defect; the problem is that a future violation beside them would have landed unreported, and the blind spot is self-concealing, because an explicit suppression inside a bailed function afterwards reads as an unused directive.The specified fix would not have worked, and that is the finding
The task line said to replace the blanket directive with an explicit
set-state-in-effectsuppression. That presumes the rule was firing on these effects. It is not: with the directive removed,set-state-in-effectreports nothing on either hook — both writes go through an updater that bails when nothing changed, and the rule's heuristic accepts that. What the comment was actually silencing isexhaustive-depsitself, a warning here, firing because the effect has no dependency list at all. So the explicit suppression would have been an unused directive, and theexhaustive-depsone is the very comment that causes the bail. No inline form both silences the warning and leaves the function analysable.So the suppression moved out of the source and into
eslint.config.js, scoped to those two files by name. A config-leveloffis invisible to the compiler — it reads directives from the source — so it suppresses exactly the rule it names and leaves everything else analysable. The task line is corrected in the change document rather than left to misdirect the next reader, and the reasoning is recorded under Design Decisions.The general form, which is the part worth carrying: a suppression's blast radius depends on where it is written, not only on what it names.
What pins it
Four assertions in
src/__tests__/effectHookLintGate.test.ts, deliberately different in kind:setState. ViaESLint#lintTextwithfilePath, so the plant never touches the disk —stories.test.tsximports both files, and mutating them mid-run would race a parallel worker. Both directions, so neither half passes vacuously.set-state-in-effectaterror. The mechanism in isolation..ts/.tsxfile undersrc/for a comment that disarms the rule. It extracts each comment and tests its body, which is what makes it total rather than a list of special cases, and it rejects two shapes: a comment naming the rule in a suppression anywhere in it, and a rule-less blanket disable (/* eslint-disable */, including ESLint's-- reasondescription form). The spec is inside its own scan rather than exempt from it — its docblocks may not spell a directive out, and the fixture's is assembled at runtime.exhaustive-depsoff,set-state-in-effectstillerror. A scan proves the directives are gone and says nothing about what replaced them.Two things measured while building 3, both corrections rather than confirmations. First: a rule-less blanket disable is the only directive form that silences
set-state-in-effectat all — every named next-line spelling leaves it reporting, because the rule reports on a line the directive does not cover. So the named forms defeat the compiler's analysis and the blanket form defeats ESLint's; two mechanisms, one outcome, and the scan rejects both shapes. Second: generated files are excluded by the.gen.tssuffix becauseESLint#isPathIgnoredanswers false forsrc/routeTree.gen.ts— the config's entry is'*.gen.ts', and a bare*in a flat config does not cross/, so it matches nothing undersrc/. That file is lint-clean today only because of its own blanket disable.The file walk uses Node rather than
git ls-files: the siblingremoveFixtureDirtolerates git being unavailable on purpose, and a merge-blocking scan that required a subprocess would be unrunnable wherever process creation is restricted.Probes
Every probe verified its mutation applied and read the reported test count.
tokens.stories.tsxcustomCss.stories.tsxset-state-in-effectoff for those two fileseslint-disable-linesuffix form/**opener directiverouteTree.gen.tsflagged, as it should be)/* eslint-disable -- reason */useEffectplant anchor drifts while theuseRefone still landsM and N changed the diff, and they are the finding underneath the finding: both mutations are semantically real — each would blind the rule in exactly the two files this task is about — and both passed, because a file-scoped config change is invisible to fixtures living in a throwaway directory. That gap is what the resolved-config assertion closes. O through Z are the same instinct applied to spellings and to the plant itself, and S, T, U, W, Y and Z were all added in response to review findings rather than found by me.
Gates
Run unpiped on the current head (
306cc58,origin/mainmerged), exit status read,pwdechoed on every command.npm testnpm run lintMigrationCutoffswarningnpm run typechecknpm run test:coveragenpm run build-storybookAbout the earlier
--no-verifypush, so the record does not leave an unexplained bypass. The first push of this branch skipped the pre-push hook becausemainwas red at the time onstory: CoverCard > UnknownEntity— a failure this branch inherited and did not cause, since it is byte-identical tomainfor every file involved. That was #322's never-executed assertion meeting #323's story runner: each green alone, red together. It is fixed onmainby #327, this branch has merged that, and the current head passes the pre-push hook on its own — the push that produced this head used no bypass.Patch coverage, checked on a freshly regenerated
lcov.info(deleted before the run, so it cannot be stale from a red one) and readingBRDA:alongsideDA:: of the 8 changed files, 0 appear in the coverage denominator — every one is a doc,eslint.config.js, a*.stories.tsx, or under__tests__/, all excluded byvitest.config.ts. No new or changed line hasDA:at zero or an untakenBRDA:branch, because none is measured at all. There is nothing forcodecov/patchto gate either way.Review passes
codex reviewraised two findings, both fixed: the scan matching a single directive spelling (now a pattern; probes O/P/Q), and the scan requiring agitsubprocess (now a Node walk). Local CodeRabbit raised two minor findings, both fixed: a magic> 100file-count threshold coupling the scan to repo size (now anchored on the two files the task is about, which an empty or truncated walk cannot satisfy either — probe R), and a stale paragraph in the change document still describing the inline fix that turned out not to work.Summary by CodeRabbit
Documentation
Bug Fixes
Tests