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[Fix] Let the resumed build watch do the one rebuild after a Gutenberg apply - #508
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…g apply Checking out a pull request, leaving it, restoring saved work or applying a patch that moves the lockfile on a Gutenberg site with the build watch running ran two full builds back to back: the apply's own npm run build, then the resumed npm run dev, which removes build/ and rebuilds every package before it watches. The apply's build was thrown away the moment the watch resumed. planWatchImpact now knows whether the target's watch rebuilds on start (the registry's readyPattern) and whether the apply is a whole-tree switch, and says who builds: the live watch (#262), the resumed watch, or the apply itself. On Gutenberg an apply that paused the watch skips its own build and waits for the watch's ready line before confirming, the same line the dev-server start waits for. Core, and any site with no watch running, is unchanged. Fixes #506 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
… move its lines to a module Three findings from the pre-PR review. The restore decision lived in a variable scoped to an effect with no dependency list, so the renders between begin and complete reset it and the restore still ran its own build. The apply's waiter survived a later pause and would have confirmed the wrong apply on the next run's ready line; every pause now bumps an id the callbacks check. The hand-off's branch and its three lines are resumedWatchHandOff in watch-activity.cjs, with tests. The review rule about effect-scoped state is added to the instructions file. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Understand this PR’s impact Explore downstream dependencies and potential security impact with Blast Radius. 📝 WalkthroughWalkthroughThe change adds resumed-watch build attribution to apply, pull request switch, and saved-work restore flows. Planning now distinguishes live-watch, resumed-watch, and direct builds. The renderer waits for the resumed watch before completing an apply when it performs the rebuild. Watch handoff messages and unit tests cover paused and non-paused states. Documentation describes the updated Core and Gutenberg build behavior. Assessment against linked issues
Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: 🟡 Moderate · up to A prior apply can report completion or failure after a newer apply finishes, causing misleading status. Invalidate handoffs when every apply starts before merging. 🚥 Pre-merge checks | ✅ 3 | ❌ 1❌ Failed checks (1 inconclusive)
✅ Passed checks (3 passed)
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In `@src/renderer/index.jsx`:
- Line 2874: Increment the apply generation at the start of every apply or
switch, including the live-watch path, rather than only in applyHandOffRef.
Ensure resumed-watch ready and failure callbacks reject stale generations so an
earlier hand-off cannot update state after a newer apply completes, and add a
regression test in the existing tested renderer CJS module covering
resumed-watch followed by src-only apply.
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…at a pause A src-only apply during the resumed rebuild goes through the live watch without pausing, so the earlier apply's waiter stayed current and reported again on the ready line. The hand-off now uses createRunGeneration, the mechanism the watch runs already use: every apply, switch and pause invalidates it and the callbacks check their token. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This was referenced Sep 21, 2026
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…g green at checkout (#511) ## Why After a pull request is checked out on a Gutenberg site with the build watch running, the card showed the green **PR #N is applied.** banner as soon as the checkout was done, while the resumed `npm run dev` was still removing `build/` and rebuilding every package: about 40 s on an M5 Pro, about eight minutes on Windows (#508's pass). The site answers with Gutenberg's *requires files to be built* notice for all of it. #492 added a wait line, but the colour said "ready to try" before anyone read it (#509). ## What changes **The decision.** `appliedBannerState` in `src/renderer/watch-activity.cjs` takes the PR number, the watch state, the #492 compiling flag and whether the last rebuild was cut short, and returns the banner's tone, headline, body and the reason Revert waits, the way `applyFinishMessage` already decides the terminal line: | tone | when | headline | Revert | |---|---|---|---| | amber | the watch is `building` | **PR #N is applied. The site is rebuilding.** | shown, disabled, tooltip *Wait for the build to finish.* (the same reason the ticket actions carry during a build) | | red | the watch stopped or exited before its ready line | **PR #N is applied but not built.** | enabled | | green | otherwise | **PR #N is applied.**, today's text; the #492 compiling line stays as body while a hand-off is open | enabled | **Revert.** The button now carries every reason the ticket actions carry (install, build, trunk update) plus the rebuild wait, through `ReasonedButton`, instead of a bare `disabled`. **The wiring.** `buildInterruptedRef` in `src/renderer/index.jsx` already knew that a watch stopped mid-rebuild leaves `build/` incomplete (#499); it was a ref, so the banner could not read it. `markBuildInterrupted` now moves the ref and a state together at the four places that set or clear it. The banner reads the decision; `describePrCheckout` is untouched, so the green headline the journeys assert is the same string. The guide names the amber and red states. ## How to test this Platform: either. Build: the Buildkite artifact for the current head, or `npm start` from the repository root. Use a copy of a built Gutenberg site, not one you care about. **Starting state:** a built Gutenberg site with the Build watcher tab reading *(watching)*. 1. Paste a small pull request number, click **Apply PR**, then **Check out**. Expected: as soon as the checkout is done the banner is amber and reads **PR #N is applied. The site is rebuilding.** with the wait sentence under it; **Revert this PR** is greyed with the tooltip *Wait for the build to finish.*; the tab reads *(building)*. 2. Wait for the tab to read *(watching)*. Expected: the banner turns green and reads **PR #N is applied.** in the same moment the toast **Checked out the pull request** appears; Revert is enabled. 3. Click **Revert this PR**, wait for the toast, then repeat step 1 and, while the banner is amber, click **Stop build watch**. Expected: the banner turns red, **PR #N is applied but not built.**, and says to start the watch or run `npm run build`. 4. Click **Start build watch**. Expected: amber while it rebuilds, green once it is watching. 5. Click **Revert this PR**. **What must not have happened:** a green banner while the tab reads *(building)*; a banner that stays amber or red after the tab reads *(watching)*; a Core site's banner changing colour at all (its checkout runs its own build before the banner appears). Done on macOS, on the current head, by a Playwright script driving the app against a scratch copy of a built Gutenberg trunk, PR #83258: amber with the rebuilding headline, Revert disabled with the tooltip and the tab at *(building)* 8 s after **Check out**; green with the toast 46.8 s in; stop during the rebuild turns it red in under a second; **Start build watch** turns it amber, then green at *(watching)* 38 s later; both reverts end on **Restored the previous branch**. The script read the banner's computed border and background colours at each step. Done on Windows 11 (UTM VM, arm64 host), Buildkite artifact for `a5c65c1`, by hand, on a Gutenberg site with the watch running and no issue linked: steps 1 and 2 as expected, amber with the headline and the greyed Revert with its tooltip as soon as the checkout was done, green with Revert enabled when the tab read *(watching)*, the watch's own build reported 215 s. Tests: `tests/unit/watch-activity.test.cjs`, five `#509` cases, fail on trunk (`appliedBannerState` did not exist) and pass here. Lint clean, 1610 unit tests pass. Steps 3 to 5 repeated on the head commit after the review fixes. The `gutenberg-site` and `pr-checkout` journeys assert the green headline; their fixtures run no watch, so the banner is green at once and they pass unchanged. ## Risks and limitations - The red tone depends on the interrupted-build flag, which a successful `npm run build` or the watch's next ready line clears. A build run from a terminal outside the app does not clear it, so the banner stays red until the app builds or watches again. Pre-existing for the dev-server guard (#499), now visible. - The patch-layer banner (a `.diff`/`.patch` file applied on Gutenberg with a lockfile move, the only patch path that pauses the watch) keeps the #492 line without the colour change. Same shape if wanted; out of scope here. ## Related Fixes #509. Builds on #492, #499, #508. Part of #251, v1.2.0-beta.2. --- <details> <summary>Review outcome (required — see AGENTS.md)</summary> 3 [fix here] · 3 [follow-up] on `5739f2e` — all three fix-here fixed in `a5c65c1`. - Fixed: Revert kept a bare `disabled=` after becoming a `ReasonedButton`, so an install or trunk update greyed it with no sentence; it now composes the rebuild wait with `ticketActionsReason`. - Fixed: `describePrCheckout` still worded a headline nobody rendered, pinned by two tests; removed, `appliedBannerState` owns it. - Fixed: `APPLIED_BANNER_COLORS` had no fallback for a tone the module could add; falls back to green like `WATCH_DOT_COLORS`. - Follow-up: the applied-patch banner keeps the old green-while-unbuilt shape; `appliedBannerState` would need a subject parameter to serve it. Listed under Risks. - Follow-up: the red body says "the build watch stopped" even when a later failed build of the app's own is what left `build/` incomplete. Contrived; wording only. - Follow-up: "Wait for the build to finish." is duplicated with `ticket-actions.cjs`; the composition above makes the copy in `watch-activity.cjs` reachable only from the building tone. - CodeRabbit on `a5c65c1`: 2 actionable. The Revert reason decided inline in `index.jsx`: fixed in `b4613c2`, `appliedBannerState` decides it. Journey assertions for the amber and red headlines: declined, the journey fixtures cannot run Gutenberg's watch; answered inline. - The review named a rule the instructions file did not cover: journey locators with `exact: true` that pin a string which turned conditional. Added to `.github/instructions/code-review.instructions.md` §5. </details> 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
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…ot only in the runners (#512) ## Why On Windows, a Gutenberg build opens black console windows, and closing one breaks the build: npm reports `Build failed: Command failed: wp-build` while `wp-build` runs on as an orphan (#497, #498). A Core build never shows one. **Where it comes from, pinned from the code.** The four runners call `hideChildWindows()` before loading npm in-process, so npm's own `cmd.exe` children are spawned with `windowsHide`. Gutenberg's `tools/build-scripts/build.mjs` is a separate Node process below npm: `node` on PATH is the app's `node.cmd` shim, which runs Electron as Node, and Electron is a GUI-subsystem binary with no console of its own. `build.mjs` runs `tsc` and `wp-build` through `cross-spawn`, which resolves their `.cmd` stubs and calls `spawn('cmd.exe', ['/d','/s','/c', …])` with no `windowsHide`. A console application spawned by a consoleless parent without `CREATE_NO_WINDOW` gets a brand-new visible console. Core's grunt spawns no `.cmd` below npm, which is why it never showed one. ## What changes The `win-spawn-patch.js` preload already reaches every descendant Node on Windows through `NODE_OPTIONS=--require` (that is how a bare `spawn('node')` keeps working). Its self-apply is now `selfApply()`, exported and injectable, and on Windows it also applies `hideChildWindows()` from a copy of `hide-child-windows.js` that `ensureNodeShimDir()` places beside it, for the same reason the patch itself is copied: a `--require` into `app.asar` is not reliable under `ELECTRON_RUN_AS_NODE`. The runners get the patch twice, which its marker makes a no-op. A missing copy costs the hiding, never the spawn patch. Nothing changes off Windows, and main.js still never takes the patch (the editor launch needs its window, #181). ## How to test this Platform: **Windows** (the change is a no-op elsewhere). Build: the Buildkite artifact for the current head. Use a Gutenberg site past the install step; a copy, not one you care about. 1. Click **Run full build**. Expected: no console window at any point during the transpile and bundle phases; the build ends with the same output as before. 2. Optional: **Start build watch**. Expected: no window either; the tab reaches *(watching)*. **What must not have happened:** a window during either; a build that fails to start (`spawn node` EINVAL would mean the spawn patch was lost with the hiding); Core's build changing in any way. Done on Windows 11 (UTM VM, arm64 host), by hand, on the Buildkite artifact for `f49c77f` (#513's head, which includes this branch at `5084f31`), Gutenberg site past install: **Run full build** ran to the end with no console window at any point, and **Start build watch** the same; Task Manager showed the `conhost.exe` of the hidden consoles where the windows used to be. Not tested by hand on macOS: nothing runs differently there. The unit tests inject the platform. Tests: `tests/unit/win-spawn-patch.test.cjs`, three `selfApply` cases, fail on trunk (no `selfApply`) and pass here; `tests/unit/ipc-wiring.test.cjs` asserts the copy lands beside the patch on Windows. A third case lays the two files out in a temp dir the way `ensureNodeShimDir()` does and applies the real hide patch to a fake `child_process`, so the sibling lookup production runs is what the suite pins. Lint clean, 1614 unit tests pass. ## Risks and limitations - The hiding applies to every `child_process` entry point of every descendant Node, overriding an explicit `windowsHide: false`. A build tool that wanted a visible window would lose it; none does. - The one link this cannot reach is a `cmd.exe` spawned by another `cmd.exe` (a `.cmd` stub calling a `.cmd` stub); those inherit the hidden console of the Node that started the chain, so they are covered by inheritance, not by the patch. - #498 (the orphan the closed window leaves) is the next PR in this stack. ## Related Fixes #497. #498's PR is stacked on this one. Seen on the #508 pass. Part of #251, v1.2.0-beta.2. --- <details> <summary>Review outcome (required — see AGENTS.md)</summary> 2 [fix here] · 2 [follow-up] on `82f0d2f`, all four taken in `5084f31`. - Fixed: the header of `win-spawn-patch.js` still said built-ins only. - Fixed: the default `requireHide`, the only one production runs, had no test; `selfApply` now applies `patchChildProcess` to the same `child_process` it patched, which made it testable from a shim-dir layout in a temp dir. - Taken: a failed copy of `hide-child-windows.js` is logged from main, the one process that can say so (the preload's stdout is the build's). - Taken: the #181 guard also asserts main never requires the preload, the second way into `hideChildWindows` the stub map cannot see. - The review named a rule the instructions file did not cover: a stub-map test that an absolute-path `require` walks around. Added to `.github/instructions/code-review.instructions.md` §5. </details> 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
This was referenced Sep 22, 2026
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…g trunk update (#516) ## Why Same double build as #506, on the trunk update path. On a Gutenberg site with the build watch running, **Update to latest trunk** paused the watch, ran `npm run build` (25-30 s on an M5 Pro, about 4 min on the Windows VM), then resumed `npm run dev`, which removes `build/` and rebuilds every package again before it watches (28 s, about 8 min on Windows). The update's own build was thrown away the moment the watch came back, and the site answered with Gutenberg's *requires files to be built* notice for the second build. #508 fixed this for applies and left the update alone to keep that PR small. ## What changes **The decision** is the one #508 added: `beginTrunkUpdate` and `retryInstallAndBuild` (`src/renderer/index.jsx`) ask `planWatchImpact` with `wholeTree` and the target's `watchRebuildsOnStart`, and when the resumed watch rebuilds from scratch the chain skips its own build and resumes the watch right after the reset or the install. Core's `grunt _watch` touches nothing on start, so Core keeps its build; a site with no watch running is unchanged. **What differs from an apply.** An apply is done at the hand-off (the checkout is on disk) and confirms on the watch's ready line. A trunk update is not done until `build/` matches the new source: `main.js` writes `updateIncomplete: true` at the reset and only `markUpdateComplete` clears it, so ending the chain at the hand-off would show the red *Update incomplete* banner for the whole rebuild. So the card stays on step 3 of 3, reading *The build watch is rebuilding — output in the Build watcher tab* (`updateStepText` in `src/renderer/update-plan.cjs`), the terminal lock is released (the watch holds none), and the persisted marker, the summary and the toast wait for the ready line. A watch that exits before it leaves the update incomplete with the existing banner and **Retry install & build**, which runs the same hand-off. The lines are `resumedWatchUpdateHandOff` in `src/renderer/watch-activity.cjs`. **Stop build watch stays enabled during the wait.** Every other `isUpdating` gate holds (a PR switch, a ticket switch, an apply and the retry all pause the watch, and a pause kills it without settling the waiters), which is also why this hand-off needs no generation token: no path can orphan its waiter. The one control that can end the wait is a stop, which settles the waiters and lands in the incomplete path. From the self-review; see below. Docs: `docs/guide/trunk-updates.md` step 3 and the trunk-update sentence in `docs/guide/running-the-site.md`. ## How to test this Platforms: either. Build: the Buildkite artifact for the current head, or `npm start` from the repository root. Use a copy of a built Gutenberg site, not one you care about. **Starting state:** a built Gutenberg site behind trunk (or one whose trunk snapshot the app considers stale), dev server up, **Start build watch** clicked and the Build watcher tab reading *(watching)*. 1. ☰ **More** → **Update to latest trunk**. Expected: the Build watcher tab reads *(paused)*, the card shows step 1 fetching; then the terminal shows *Dependencies unchanged* (or the install) and **no** `Running npm run build…`; the card's step 3 reads *The build watch is rebuilding — output in the Build watcher tab*; the tab goes *(building)*, then *(watching)*, and only then the toast **Updated to the latest trunk**, the terminal line *Update complete — the build watch has rebuilt*, and the green *Up to date with trunk as of today* summary. Roughly half the time of trunk. 2. While step 3 is current: **Stop build watch** is enabled; every other site action (Start/Stop dev server, Review & submit, ticket link, Apply) is disabled; the terminal's prefill links are greyed. Click **Stop build watch**. Expected: the card closes, the terminal says *Update incomplete — the build watch stopped before it finished rebuilding*, the red banner offers **Retry install & build**. 3. Click **Retry install & build** with the watch stopped. Expected: unchanged from trunk, `npm install` then `Running npm run build…`, the toast after the build, no watch starts. 4. Start the watch, then **Retry install & build**. Expected: the hand-off again, as in step 1. 5. A Core site with its watch running: **Update to latest trunk**. Expected: unchanged, the update pauses the watch, runs `npm run build`, resumes it. 6. Same site as step 1, watch stopped: **Update to latest trunk**. Expected: unchanged from trunk, `Running npm run build…` runs and the toast follows it; no watch starts. **What must not have happened:** two full builds after an update on Gutenberg; the toast or the green summary before the watch is watching; the red *Update incomplete* banner visible while the watch rebuilds; Core's update skipping its build; **Stop build watch** disabled while step 3 waits on the watch. Tests: `tests/unit/update-plan.test.cjs` (`planUpdateSteps` keeps the build step, `updateStepText` names the watch only while current) and `tests/unit/watch-activity.test.cjs` (the three hand-off lines). Lint clean, 1625 unit tests pass. The `trunk-update` and `gutenberg-site` journeys pass. **Done on macOS 27 (M5 Pro), on the Buildkite artifact for `621d3d5`**, against a Gutenberg site and a Core site each reset ten commits behind trunk. All six steps as written: | Step | Observed | |---|---| | 1, Gutenberg with the watch | install, **no** `Running npm run build…`, step 3 named the watch, toast on the ready line | | 2, stop during the rebuild | Stop build watch enabled and every other action disabled; *Update incomplete* and the retry banner | | 3, retry with the watch stopped | install then `Running npm run build…` (23 s), toast after it, the watch stayed stopped, *rebuilt in 26s* | | 4, retry with the watch running | install, no build of its own, step 3 named the watch, toast on the ready line, *rebuilt in 30s* | | 5, Core with its watch running | *(paused)*, `Running npm run build…` (grunt), *(watching)* again, toast, *rebuilt in 10s* | | 6, Gutenberg with the watch stopped | `Running npm run build…` (25 s), toast after it, no watch started, *rebuilt in 33s* | Core was also run with no watch (unchanged, *rebuilt in 19s*). No double build appeared on any Gutenberg path, and no toast or green summary arrived before the watch was watching again. A note for whoever repeats this: resetting the checkout by hand moves `package-lock.json` back without installing, so a **Start build watch** that has to build first can fail Gutenberg's own dependency check (*Dependencies are out of sync*). Running `npm install` in the app's terminal clears it. Not reachable through the app's own flow, where the update installs before the hand-off. ## Risks and limitations - **Windows not covered.** The pass above is macOS only. The change is platform-independent, but Windows is where the resumed rebuild takes minutes rather than seconds, so it is where the wait, and the enabled **Stop build watch**, matter most. - Stopping the watch during the rebuild leaves `build/` incomplete, so the next **Start build watch** runs a full build before it watches. Pre-existing (#499), and the incomplete banner says what state the site is in. - Nothing in the suite reaches the two `planWatchImpact` call sites or the `afterInstall` dispatch in `index.jsx`: drop `buildBy` from either call and the suite stays green. The accepted consequence of "renderer decisions live in modules" (the wiring is untestable by construction); the manual pass is what covers it. The hand-off's own transitions were in the same position and are now in `update-handoff.cjs` with tests, after CodeRabbit. - The update's confirmation now depends on the watch's ready line. A watch that hangs without exiting leaves the card on step 3 with **Stop build watch** as the way out, which lands in the incomplete path. - The `rebuilt in` figure in the green summary now includes the watch's own rebuild. Self-review: 2 [fix here] · 2 [follow-up]; both fixed, one follow-up taken here, one recorded above. ## Related Fixes #507. Follow-up to #508 (#506). Part of #251, v1.2.0-beta.2. --- <details> <summary>Design decisions and alternatives considered</summary> - **Finish the chain at the hand-off, like the apply.** Rejected: the persisted `updateIncomplete` flag is set at the reset, so the red banner would show for the whole rebuild, and "Update complete" would be said before `build/` existed. - **Skip the build step in the card**, the way the apply card does. Rejected: the update is not complete until the build is, and a skipped third step with the counter at "step 4 of 3" says the opposite. The step stays real and names who runs it. - **A generation token on the waiter**, as the apply has. Rejected: a stale settle would leave the card on step 3 with no way off, and every path that could pause the watch during the wait is gated on `isUpdating`. The comment in `handOffToResumedWatch` says what that safety depends on. - **Release the terminal hints too.** Tried, reverted on review: the only effect was to offer a one-click `npm run build` over the tree the watch was rebuilding. </details> <details> <summary>Review outcome (required — see AGENTS.md)</summary> 2 [fix here] · 2 [follow-up] on `57a0177` — both fix-here fixed in `621d3d5`, one follow-up taken there. - Fixed: **Stop build watch** was disabled through the wait (`disabled={isUpdating}`), so the documented recovery was unreachable and a hung watch left the site row inert until a restart. Now `isUpdating && !updateWaitingOnWatch`. - Fixed: the released terminal hints offered `npm run build` / `npm install` prefills while the watch rebuilt `build/`. Reverted to plain `isUpdating`. - Taken: the step's text decision was inline in `index.jsx`; now `updateStepText` in `update-plan.cjs`, with tests. - Recorded (Risks): the `planWatchImpact` call sites in `index.jsx` are not reached by the suite. - The review named a rule the instructions file did not cover (a chain that releases the terminal lock but keeps its busy state must keep one enabled control that ends the wait); added to `.github/instructions/code-review.instructions.md`. - **Review:** completed — `/self-review` (Explore subagent, judgement pass; lint and unit inline); reviewed head `57a0177` / base `df532e5` (trunk); evidence: findings above; outcome: 2 fixed, 1 taken, 1 recorded. - **Second review:** completed on `80805a0` — `/self-review` again (fresh `Explore` subagent), reviewing only that commit against `621d3d5`; 0 [fix here] · 2 [follow-up], and the extraction confirmed behaviour-preserving field by field (waiter registration still cannot settle before the state is applied, the failed path stays synchronous, the moved string is byte-identical). Both follow-ups applied in `ab6c8ea`: the plan's `releaseTerminal` and its unread `completesUpdate` fields dropped, the terminal-lock release back in the component, and `'building'` added to the no-wait test's states. Lint clean, 1630 unit tests pass, the `trunk-update` journey passes. - **Since the second review:** `80805a0 → ab6c8ea`, that review's own two follow-ups and nothing else; lint clean, 1630 unit tests pass, the `trunk-update` journey passes, and the full CI matrix (unit, journeys and packaged smoke on macOS and Windows) is green on `ab6c8ea`. CodeRabbit was asked again on the new head and answered *Review rate limited*, noting it does not re-review commits it has already seen, so its review of record stays `621d3d5` and the pre-merge self-review is the review of record for `80805a0` and `ab6c8ea`. - **Since review:** `57a0177 → 621d3d5` checked: the fixes above, their tests and the instructions rule; lint clean, 1625 unit tests pass; `trunk-update` (2) and `gutenberg-site` (1) journeys pass. - **CodeRabbit:** completed on `621d3d5` (requested by comment); 1 [fix here] 🟡, `handOffToResumedWatch` decided three state transitions inside `index.jsx` where the suite cannot reach them. Fixed in `80805a0`: `planUpdateHandOff` in `src/renderer/update-handoff.cjs` returns the state each outcome lands in and whether it completes the update, `index.jsx` applies it, and `tests/unit/update-handoff.test.cjs` covers the four outcomes including that only the ready line writes the complete marker. Lint clean, 1630 unit tests pass, the `trunk-update` journey passes. The manual pass above was driven on `621d3d5`; `80805a0` changes no behaviour, only where the decision lives. </details> <details> <summary>Screenshots or recording</summary> No new surface beyond the wording of step 3 of the update card while the watch rebuilds. On Gutenberg it reads *The build watch is rebuilding — output in the Build watcher tab* while the **Build watcher** tab shows *(building)*, with **Stop build watch** the one enabled action; on Core it still reads *Rebuilding — output in the Terminal below*. The timings table above is the rest of the evidence. </details> 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
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Sep 23, 2026
… restarting it (#517) ## Why On a Gutenberg site with the build watch running, linking an issue, switching work items or unlinking paused the watch for the checkout and resumed it after. Gutenberg's `npm run dev` removes `build/` and rebuilds every package when it starts, so a branch switch that changed nothing under `packages/` cost a full rebuild: about 28 s on macOS, about 8 minutes on Windows, with nothing on screen saying why. Core's `grunt _watch` resumes for free, which is why this never showed there. Seen on the 21 Sep 2026 pass of #508: a number typed into the GitHub issue field linked issue #83258 and the watch rebuilt for five minutes. ## What changes The root cause is that every work-item switch planned itself as a whole-tree change (`planWatchImpact({ wholeTree: true })` in `ticketSwitchLifecycleRef.begin`), and a whole-tree change always pauses a live watch. That is right for the switch that puts back a pull request parked on a work item, because that one chains an install and a build of its own (#506). It is wrong for a plain link, unlink or switch, which only moves the checkout. The rebuild such a switch needs is the selective one a running watch already does: Git writes the files of the new branch, the watch recompiles those packages. That is the same bargain the app makes for a src-only patch (#262), and `planWatchImpact` already knew how to answer it. The switch only had to stop claiming to be whole-tree. - `planTicketSwitchImpact` (`src/renderer/update-plan.cjs`) asks it with the switch's real shape, from two numbers: the pull request checked out now and the one the target work item has parked. It also takes the watch's state rather than a boolean, because a watch that has started and not reached its ready line is rebuilding `build/` from scratch, not watching: a checkout landing under it would leave the packages it had already written on the old tree's output. Such a switch keeps the pause it had on trunk. Only a watch that is actually watching is handed the change. `prTransition = fromPr !== toPr` mirrors `ticketPrImpact` in main, which decides the same thing from the two refs after the fact. - The decision has to be made before the checkout starts, and `sites:set-ticket` only reports `prTransition` afterwards. So `branches:list` now reports `savedPr` per work item, from `savedPrRef` in `src/main.js`: the rule `ticketCheckoutRef` already applied, extracted so both sides read the record the same way. No extra Git read, since the existence check reuses the ref list the handler already has. - On a switch that keeps the watch, `complete` hands the change to it (`handOffToWatch`), so the **Build watcher** tab reads *(compiling)* until it goes quiet (#492), the same signal an applied patch gets. - A restore `begin` could not foresee (a retry of a failed switch, where main reads the ref the switch was leaving and the renderer cannot) still pauses, late, before its install. Deliberately not in it: a switch still runs no `npm install` when the two branches disagree on `package-lock.json`, exactly as before. ## How to test this Platforms: **either**, but macOS or Windows on a **real Gutenberg site** is what exercises the bug. The unit suite cannot reach it (no journey starts a build watch), so this is the pass that matters. Build: current head. **Starting state:** a Gutenberg site with `node_modules` installed and a first build done, no work item linked, no pull request checked out. From the worktree, `npm run build:once` before launching, since `src/renderer/index.js` is a build product. 1. Click **Start build watch**. Wait until the **Build watcher** tab reads *(watching)*. 2. Type an issue number into **GitHub issue number or URL** and click **Link issue**. Expected: the switch narrates itself as usual, the tab goes to *(compiling)* for a few seconds and back to *(watching)*. The watch is never *(paused)*, and its log shows no `npm run dev` start banner and no from-scratch rebuild of every package. 3. Click **Unlink**, then **Continue working on** that issue from the card below. Expected: the same, both times. 4. Now check out a pull request on that issue, then **Unlink**, then link the issue again. Expected: this switch *does* pause the watch, the checklist shows the build step skipped and names the resumed watch, and the applied banner follows the rebuild the way #511 left it. 5. Stop the watch and link another issue. Expected: nothing rebuilds, as before. 6. Click **Start build watch** and, while the tab still reads *(building)*, link an issue. Expected: this one *does* pause the watch, because it has not finished starting; the tab goes *(paused)* and the switch resumes it. Windows is where this is easy to hit, the window being minutes rather than seconds. **What must not have happened:** no full rebuild on steps 2 and 3 (the whole point: on Windows that is eight minutes), the watch not left *(paused)* on any path, the dev server not interrupted, the parked pull request in step 4 still restored with its install and build, and a `build/` that mixes two trees after step 6. The unit tests that carry the decisions fail on the old code: `planTicketSwitchImpact` did not exist, and `branches:list` returned no `savedPr` (checked). What they cannot see is the watch process itself, which is what the steps above are for. **Done on macOS 27 (M5 Pro), on the Buildkite artifact for `4cdedc8`**, on a built Gutenberg site, with issue [#83341](WordPress/gutenberg#83341) for steps 2 to 4, pull request [#83350](WordPress/gutenberg#83350) for step 4, and [#83324](WordPress/gutenberg#83324) for step 5. All five steps as written. The evidence for steps 2 and 3 is the **Build watcher** log itself: one `Running npm run dev…` for the whole run, the one from **Start build watch** at 15:04:31, ending in *Watching for changes*. Linking the issue, unlinking it and switching back to it added nothing to that log: no second start banner, no *Paused while another operation uses the build*, no from-scratch rebuild of every package. On trunk each of those three switches costs one. **Done again on Windows 11 (UTM VM, arm64 host), on the Buildkite artifact for `781e3be`**, the rebased head, on a built Gutenberg site at `C:\Users\JuanMa\Desktop\demo-gutenberg-3`. All six steps pass, and Windows is what answers the two questions macOS could not: - **Step 6, the switch taken while the watch is still starting.** The watch was paused and resumed, as the fix intends. The window is minutes here rather than seconds, which is how this case was found in the first place. - **The file handles.** Step 2's checkout rewrote files with the watch alive and nothing failed: no error from Git, no watch exit. The risk this PR declared open is closed. The watch then recompiled selectively, package by package (`rebundled` / `rebuilt` per package in its tab, `block-library` the longest at 19.7 s), rather than running the clean from-scratch cycle it runs on trunk, where the same switch costs about eight minutes. Steps 4, 5 and 6 behaved as on macOS: the plain switch back to a second work item kept the watch, the parked pull request paused it and handed the rebuild to the resumed watch, and with the watch stopped nothing rebuilt. Two lines the watch prints on Windows are worth knowing and are not this PR's: Gutenberg's own `dev.mjs` starts by reporting `'ps' is not recognized as an internal or external command`, and a watch killed mid-TypeScript-build (which is what a pause is) prints `TypeScript compilation failed` before it exits. The state machine is unaffected — the watch stayed `paused` and resumed correctly — but the tab reads like a build error when nothing is wrong. Step 4 behaved as it must: applying the pull request paused the watch and handed the rebuild to it, the applied banner sat amber reading *PR #83350 is applied. The site is rebuilding.* while the tab rebuilt, and turned green with the **Checked out the pull request** toast when the watch was watching again (#508, #511). Step 5, with the watch stopped, rebuilt nothing. ## Risks and limitations - Nothing disables **Link issue** while the watch is starting, so step 6's switch is offered throughout that window; it is now planned as a pause rather than refused. Disabling the ticket actions while the watch owns `build/` is the same family as #503 and is not done here. - **The watch now compiles while the checkout is still landing.** It will briefly see a half-written tree and may print resolution errors into its tab before the final write re-triggers it. Self-correcting, but noisier than the silence the paused watch gave. - ~~**Windows file handles.**~~ Answered by the Windows pass above: the checkout rewrote files under a live watch without an error on either side. - On Windows the watch prints `TypeScript compilation failed` when a pause kills it mid-build, so the tab reads like a failure although the pause is deliberate and the resume is clean. Cosmetic, pre-existing, and not made more likely by this PR, which pauses in one more case than before. - A switch between two branches whose `package-lock.json` differ still installs nothing. Unchanged from trunk, and out of scope here. - The renderer predicts the switch's shape from state it already holds (`pullRequest` from `site:status`, `savedPr` from `branches:list`, both reloaded after every switch) rather than asking main. A prediction that is wrong can only be wrong towards a needless pause, and the one case where it was is fixed in the second commit. ## Related Fixes #510. Follow-up to #508 and #506. Part of #251. --- <details> <summary>Design decisions and alternatives considered</summary> **A new IPC handler that previews the switch** would have been more faithful, since main would answer with the same function that later performs the switch. Rejected: it adds a round trip in front of a switch that already has one, and it does not remove the disagreement, it only moves it, since the record can still change between the preview and the switch. Reporting `savedPr` on a list the panel already reloads after every switch costs nothing and is read from the same record. **Asking Gutenberg's watch not to rebuild on start** is the other way to make the pause cheap. Out of scope: `npm run dev` has no such flag, and the upstream `--no-clean` work is not this repository's. **A journey (layer 4)** would replace the manual pass, per AGENTS.md. Nothing in `tests/e2e/` starts a build watch today, so it would mean building that fixture first: a fake `dev` script that prints the ready line and stays up, and an assertion that the process was never restarted. Worth doing, and deliberately not done here, so the fix can ship in beta.2. </details> <details> <summary>Review outcome (required — see AGENTS.md)</summary> 4 findings: **2 [fix here] · 2 [follow-up]**. Both `[fix here]` fixed in `4cdedc8`, one `[follow-up]` fixed with them, one recorded above. - 🟡 architecture/tests, `[fix here]`: the saved-pull-request lookup lived in `index.jsx`, where the suite cannot reach it (§1). **Fixed**: moved to `savedPrForSwitch` in `src/renderer/ticket-branch-list.cjs`, with its own tests. - 🟡 performance, `[fix here]`: re-linking the work item already in hand while its pull request is checked out read the row, found nothing (a branch records its parked pull request only when it is *left*), and paused the watch for a switch main performs as a no-op. The exact cost this PR removes, in the one case it was adding back. **Fixed**: linking the item in hand answers with the pull request already checked out. - 🔵 tests, `[follow-up]`: the `branches:list` test covered both negative reasons but not the ordinary row with no parked pull request. **Fixed** in the same commit. - 🔵 cross-platform, `[follow-up]`: the watch compiling a half-checked-out tree, and the Windows handle question. **Recorded** under Risks; no code change. - **Manual pass:** completed on macOS, on `4cdedc8`; see **How to test this**. - **Review:** completed, by a fresh agent context (`Explore` subagent, review standard in `.github/instructions/code-review.instructions.md`); reviewed head `964f651` (now `9fc3315`, same tree, commit message reworded) / base `origin/trunk`; `npm run lint` clean and `npm test` 1625 pass / 0 fail / 2 skipped at that head. - **Since review:** `964f651` to `4cdedc8`, the review's own findings, plus their tests. `npm run lint` clean, `npm test` 1630 tests / 1628 pass / 0 fail / 2 skipped at the new head. CodeRabbit requested on `4cdedc8` by comment once the PR left draft. </details> <details> <summary>Screenshots or recording</summary> Nothing on screen changes shape. What changes is what the **Build watcher** tab says during a work-item switch, and above all what its log does **not** say: on this branch a link, unlink or switch adds nothing to it, where on trunk each one starts `npm run dev` again and rebuilds every package. The log excerpt in **How to test this** is that evidence. </details> --------- Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Why
A tester reported that the rebuild after applying a pull request on a Gutenberg site takes "quite a long time", and wondered whether Gutenberg's build was to blame. Measured (#506): it is not.
npm run buildtakes about the same through the app's Electron runtime as with a plain Node 24.18. The cost is ours: with the build watch running, the apply ran a fullnpm run build, then resumednpm run dev, which removesbuild/and rebuilds every package again before it watches. Two full builds back to back, the first thrown away, and the site unusable for the second.What changes
The decision.
planWatchImpact(src/renderer/update-plan.cjs) now takeswatchRebuildsOnStart(the registry'sreadyPattern, Gutenberg'snpm run dev) andwholeTree(a pull request checkout, leaving one, restoring saved work), and returnsbuildBy:null(the apply builds),'live-watch'(a src-only patch under a running watch, #262 as before) or'resumed-watch'(the watch paused for the apply rebuilds from scratch when it resumes, so the apply skips its own build). The explicit build is the one dropped because the resumed watch cannot be told to skip its clean. Core'sgrunt _watchtouches nothing on start, so Core keeps its build. A site with no watch running is unchanged (#499).The wiring. The three whole-tree paths and the patch apply in
src/renderer/index.jsxpassbuildByintorunApplyInstallAndBuild. For'resumed-watch'the chain installs if the lockfile moved, registers a waiter on the watch's ready line (the same one the dev-server start waits for, #488), and letsfinishApplyresume the watch. The confirmation toast and the "open the site" line arrive on the ready line; a watch that exits first says so. The terminal and the #492 banner already cover the wait.resumedWatchHandOffinsrc/renderer/watch-activity.cjsholds the branch and the three lines. The apply's waiter is tied to its pause (every pause bumps an id) so a later apply during the rebuild cannot trigger the first apply's confirmation. The step panel's skipped build step names the resumed watch.Measured, M5 Pro, scripted pass (Playwright driving the app against a copy of a built Gutenberg trunk, watch running, PR #83258 checked out then reverted):
Running npm run buildin the terminalWindows 11 (UTM VM, arm64 host), Buildkite artifact for
3b3ff27, by hand, same site: start dev server without a watch ~45 s (#499); revert with no watch (the app's own build) ~4 min; Start build watch (npm run devuntil Watching for changes) ~8 min; PR checkout with the watch running, lockfile moved so install first, from Apply and rebuild to Watching for changes ~8 min (the watch's own build reported 231 s), noRunning npm run build, the #492 banner up throughout, "the build watch has rebuilt" at the end. On trunk that checkout is the ~4 min build plus the same ~8 min resume. Seen on the way, all pre-existing and not this PR's: the console windows of #497, an orphaned build after a stop (#498), and linking an issue with the watch running pausing and restarting it, a full Gutenberg rebuild for a branch switch that needs none.How to test this
Platforms: either; done on both, see the numbers above. Build: the Buildkite artifact for the current head, or
npm startfrom the repository root. Use a copy of a built Gutenberg site, not one you care about.Starting state: a built Gutenberg site, dev server up, Start build watch clicked and the Build watcher tab reading (watching).
Running npm run build…; the checklist's build step reads The build watch rebuilds when it resumes; the tab goes (building) then (watching), and only then the toast Checked out the pull request and the terminal line the build watch has rebuilt. Open the site to try it out. Roughly half the time of trunk.Running npm run build…runs and the toast follows it; no watch starts (Gutenberg: starting the dev server rebuilds the packages first; start Playground at once when build/ exists and start the watch on demand #499).npm run build, resumes it.What must not have happened: two full builds after a checkout on Gutenberg; a toast before the watch is watching; a toast from an apply that a later apply interrupted; Core's checkout skipping its build.
Done on macOS, on
3b3ff27, by a Playwright script driving the app against scratch copies of a built Gutenberg trunk and a built Core trunk: steps 1 and 2 (checkout 45 s, revert 41 s, toast on the ready line, noRunning npm run build); step 3 (stop during the rebuild: the failure line, no toast; the revert after it, with no watch, shows the Rebuild step and the watch stays stopped); a PR that movespackage-lock.json(#83133: install first, then the hand-off, 44 s, both ways); restoring saved work with the watch running (link an issue, apply the PR, unlink, link again: the watch pauses, no build of the app's own, toast Restored the saved work on the ready line); step 5 on Core (#13625 withgrunt _watchrunning: paused, built, resumed, toast after the build).Tests:
tests/unit/patch-plan.test.cjs, the five#506cases fail on trunk (planWatchImpacthad nobuildBy) and pass here;tests/unit/watch-activity.test.cjscovers the hand-off lines. Lint clean, 1604 unit tests pass, thegutenberg-site,pr-checkout,patch-applyandstore-persistencejourneys pass.Risks and limitations
Related
Fixes #506. Follow-up #507. Builds on #262, #488, #492, #499. Part of #251, v1.2.0-beta.2.
Review outcome (required — see AGENTS.md)
3 [fix here] · 1 [follow-up] on
8e59987— all three fix-here fixed inacdc1c1.Fixed: the saved-work restore kept its watch decision in a variable scoped to an effect with no dependency list, so the renders before
completereset it and the restore still ran its own build; now a ref.Fixed: the apply's waiter survived a later pause and would have confirmed the wrong apply on the next run's ready line; every pause bumps an id the callbacks check.
Fixed: the hand-off's branch and three user-facing lines were inline in
index.jsx; moved toresumedWatchHandOffinwatch-activity.cjswith tests.Follow-up: trunk update has the same double build; Gutenberg: updating trunk runs two full builds (npm run build, then the resumed npm run dev rebuilds from scratch) #507.
The review also named a rule the instructions file did not cover (effect-scoped state read after an
await); added to.github/instructions/code-review.instructions.md.Review: completed —
/self-review(Explore subagent, judgement pass; lint and unit inline); reviewed head8e59987/ base9ae570d(trunk); evidence: findings above; outcome: 3 fixed, 1 deferred.Since review:
8e59987 → acdc1c1checked: the fixes above plus their tests and the instructions rule; lint clean, 1604 unit tests pass, scripted pass repeated on the new head.CodeRabbit: completed on
acdc1c1(requested by comment); 1 [fix here] 🟡, a src-only apply during the resumed rebuild left the earlier apply's hand-off current. Fixed in3b3ff27withcreateRunGeneration, invalidated at every apply start; lint clean, 1604 unit tests pass, scripted pass repeated on3b3ff27.Screenshots or recording
No new surface. The change is in what runs and when; the timings table above is the evidence.
🤖 Generated with Claude Code