fix: keep the GlobalBus emit override assignable to EventEmitter - #1166
fix: keep the GlobalBus emit override assignable to EventEmitter#1166sahrizvi wants to merge 1 commit into
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`EventEmitter<T>` declares `emit` across several overloads, one of them `(eventName: string | symbol, ...args: any[])`. An override has to be assignable to all of them, and a lone `(eventName: "event", event: GlobalEvent)` is not. Newer `@types/node` rejects it with "Type 'any[]' is not assignable to type '[event: GlobalEvent]'", which fails `bun typecheck` and therefore blocks `git push` through the pre-push hook — on a file the contributor never touched. The workaround people reach for is `--no-verify`, which disables the only pre-push gate. The public overload keeps call sites typed as before; the wide implementation signature is what satisfies the base. Runtime behaviour is unchanged: an "event" payload without an id still gets one, preferring `syncEvent.id`. The regression is a compile error rather than a runtime one, so the test pins it with an assignment that only compiles while the wide signature stays. Against the previous code it fails with: error TS2322: Type '(eventName: "event", event: GlobalEvent) => boolean' is not assignable to type '(eventName: string | symbol, ...args: any[]) => boolean' Closes #1165 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018fJ3X7pcGT4R9yzjsJnqsV
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📝 WalkthroughWalkthrough
ChangesGlobalBus emit compatibility
Estimated code review effort: 2 (Simple) | ~15 minutes Merge Risk: 🔵 Low · up to The PR makes a localized TypeScript compatibility fix without changing runtime event behavior. The added tests may interfere when run in parallel because they observe shared GlobalBus emissions, so the change is mergeable with explicit owner awareness or follow-up to isolate those listeners. Poem
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Inline comments:
In `@packages/opencode/test/bus/global-emit.test.ts`:
- Around line 20-29: Update each GlobalBus listener test so it creates and
retains its emitted event object before subscribing, records an event only when
the received value is strictly identical to that emitted object, and preserves
the existing finally-based GlobalBus.off cleanup for parallel-test isolation.
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packages/opencode/src/bus/global.tspackages/opencode/test/bus/global-emit.test.ts
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| const seen: GlobalEvent[] = [] | ||
| const on = (event: GlobalEvent) => void seen.push(event) | ||
| GlobalBus.on("event", on) | ||
| try { | ||
| GlobalBus.emit("event", { payload: { kind: "test" } }) | ||
| expect(seen).toHaveLength(1) | ||
| expect(typeof seen[0]!.payload.id).toBe("string") | ||
| expect(seen[0]!.payload.id).toStartWith("evt") | ||
| } finally { | ||
| GlobalBus.off("event", on) |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
Isolate each listener from concurrent GlobalBus emissions.
Each test subscribes to the shared GlobalBus and records every "event" while its listener is active. If tests overlap, another test can add entries to seen. This can fail the length assertion or validate the wrong event.
Create the event object before subscribing. Record an event only when received === emittedEvent. Keep the existing finally cleanup.
As per coding guidelines, tests using shared state must provide teardown and isolation safe for parallel bun test execution.
Also applies to: 34-41, 46-53
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In `@packages/opencode/test/bus/global-emit.test.ts` around lines 20 - 29, Update
each GlobalBus listener test so it creates and retains its emitted event object
before subscribing, records an event only when the received value is strictly
identical to that emitted object, and preserves the existing finally-based
GlobalBus.off cleanup for parallel-test isolation.
Source: Coding guidelines
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| event.payload.id = event.payload.syncEvent?.id ?? Identifier.create("evt", "ascending") | ||
| } | ||
| return super.emit(eventName, event) | ||
| return super.emit(eventName as "event", ...(args as [GlobalEvent])) |
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SUGGESTION: The eventName as "event" and args as [GlobalEvent] casts are redundant — the wide base overload emit(eventName: string | symbol, ...args: any[]) already accepts eventName and args as-is, so the call simplifies to a plain spread.
| return super.emit(eventName as "event", ...(args as [GlobalEvent])) | |
| return super.emit(eventName, ...args) |
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1 issue found across 2 files
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<file name="packages/opencode/src/bus/global.ts">
<violation number="1" location="packages/opencode/src/bus/global.ts:29">
P2: When callers pass extra arguments through the wide signature, this forwards them to `"event"` listeners instead of preserving the previous one-payload runtime behavior. Pass only `args[0]` to keep the stated no-runtime-change guarantee.</violation>
</file>
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| event.payload.id = event.payload.syncEvent?.id ?? Identifier.create("evt", "ascending") | ||
| } | ||
| return super.emit(eventName, event) | ||
| return super.emit(eventName as "event", ...(args as [GlobalEvent])) |
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P2: When callers pass extra arguments through the wide signature, this forwards them to "event" listeners instead of preserving the previous one-payload runtime behavior. Pass only args[0] to keep the stated no-runtime-change guarantee.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At packages/opencode/src/bus/global.ts, line 29:
<comment>When callers pass extra arguments through the wide signature, this forwards them to `"event"` listeners instead of preserving the previous one-payload runtime behavior. Pass only `args[0]` to keep the stated no-runtime-change guarantee.</comment>
<file context>
@@ -11,12 +11,24 @@ export type GlobalEvent = {
event.payload.id = event.payload.syncEvent?.id ?? Identifier.create("evt", "ascending")
}
- return super.emit(eventName, event)
+ return super.emit(eventName as "event", ...(args as [GlobalEvent]))
}
+ // altimate_change end
</file context>
| return super.emit(eventName as "event", ...(args as [GlobalEvent])) | |
| return super.emit(eventName as "event", args[0] as GlobalEvent) |
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Issue for this PR
Closes #1165
Type of change
What does this PR do?
GlobalBusEmitteroverrodeemitwith a single narrow signature:EventEmitter<T>declaresemitacross several overloads, one of them(eventName: string | symbol, ...args: any[]). An override must be assignable to all of them, and that narrow one is not. Newer@types/noderejects it withType 'any[]' is not assignable to type '[event: GlobalEvent]', which failsbun typecheck— and therefore blocksgit pushthrough the pre-push hook, on a file the contributor never touched.The failure is indistinguishable from a real type error the contributor introduced, so the workaround people reach for is
git push --no-verify, which disables the only pre-push gate the repo has.This keeps the public overload so call sites stay typed exactly as before (26 of them across the repo), and widens only the implementation signature, which is the part that has to satisfy the base. Runtime behaviour is unchanged: an
"event"payload without anidstill gets one, still preferringsyncEvent.id.How did you verify your code works?
The regression is a compile error, not a runtime one, so the test pins it with an assignment that only compiles while the wide signature stays:
Reverting
global.tsto the previous override and runningtsgo --noEmitfails with the same assignability error the reports show:With the fix: 0 errors. So
tsgofails if anyone narrows it again.Also:
bun typecheck— 13 tasks successful.bun test test/bus test/server— 289 pass, 0 fail.syncEvent.idpreference.One caveat, stated plainly: I could not reproduce the original failure locally. On a clean worktree at
origin/mainwith the catalog-pinned@types/node@24.12.2,typescript@7.29.7and@typescript/native-preview@7.0.0-dev.20251207.1,global.tstypechecks clean — which also matchesmain's CI, where theTypeScriptjob passes. What is demonstrated above is that the old override genuinely is not assignable to the base signature and the new one is, which is the root cause the reported error names. Whether a toolchain version skew is also in play is tracked separately in #1165 — this PR does not address that half.Screenshots / recordings
Not a UI change.
Checklist
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Summary by cubic
Fixes
GlobalBusEmitter.emitso it stays assignable to the baseEventEmitteroverload set, which unblocksbun typecheckandgit pushon untouched code.Previously, the override had a single narrow signature that newer
@types/noderejects. Now the implementation signature is widened while the public overload is preserved, so call sites keep their exact types. Runtime behavior is unchanged. Adds a compile-time test that fails if the wide signature is narrowed again.Closes #1165.
Written for commit ac7c3bc. Summary will update on new commits.
Summary by CodeRabbit
Bug Fixes
Tests