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fix: journal xstate.done.actor events whose output is undefined - #160
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XState's createAsyncLogic completes with output: undefined for a void run, and (via its data ?? output coalesce) for one resolving null. The explicit undefined key made assertJsonSerializable throw NonSerializableAgentEventError on every such completion. createReplayEntry now drops the key; replay folds identically and the state hash already ignored it.
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| Check name | Status | Explanation | Resolution |
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Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (1 skipped: 1… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: journaling xstate.done.actorevents when their output isundefined.Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (1 skipped: 1 unsupported.)
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Actionable comments posted: 1
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Inline comments:
Review comments at @src/event-log.ts:
- Around line 546-547: Update the replay event preparation in `replay` to
restore an own `output` property with value `undefined` on done-actor events
when journaling omitted it, while leaving events that already have the property
and all other event types unchanged. Use `DONE_ACTOR_EVENT_TYPE` to identify the
relevant events.
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📒 Files selected for processing: 3
.changeset/done-actor-undefined-output.mdsrc/event-log.tssrc/run-agent.test.ts
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A guard testing key presence on the completion event now takes the same branch live and on replay.
1 participant
Problem
An invoked
createAsyncLogicactor whoserunresolvesundefined(a void actor) ornullmakes the event log throw:Cause
XState's
createAsyncLogicresolves the output withevent.data ?? event.output(present through 6.0.0-alpha.65). Anullresult collapses toundefinedthere, and a voidrunisundefinedalready. The resultingxstate.done.actorevent carries an explicitoutput: undefinedkey, which the strict journal serializer rejects.Fix
createReplayEntrydrops anundefinedoutputkey fromxstate.done.actorevents before validation. Replay folds identically (the transition seesundefinedeither way) and the state hash already ignored the key. Strictness elsewhere is unchanged:undefinedinside a user event still throws.nullcannot be restored on the agent side since XState has already erased it; that needs an upstream change ('data' in event ? event.data : event.output).Tests
test.eachoverundefinedandnullresults: the run finishes and the journaled done entry omitsoutput. Both fail without the fix.pnpm vitest run src: 669 passedpnpm check: cleanSummary by CodeRabbit
undefinedornullnow complete without a serialization error. Their journal entries can be serialized and replayed correctly.