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accounted/.claude/skills/create-extension/references/event-handlers.md
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Jakob Wennberg ec27228a8e style: remove em/en dashes repo-wide, add CLAUDE.md rule against them (#890)
Em dashes (—) and en dashes (–) had spread across comments, docs, tests,
and a few UI strings, reading as AI-generated boilerplate rather than
house style. Replaced each with punctuation matching its context: colon
for explanatory clauses, comma for asides, plain hyphen for numeric/legal
ranges (e.g. "21-23§"), "to"/"till" for date ranges, parentheses for
paired-dash asides. messages/en.json and messages/sv.json were fixed by
hand together to keep sv/en in sync.

Left untouched where the dash is the functional subject rather than
decorative punctuation: date-range-parser.ts's separator regex,
charset-repair.ts's CP1252 byte-mapping table (and its test), the SIE
encoding mojibake docs, generic-csv.ts's minus-sign normalizer, the
agent system-prompt files that already instruct against em dashes, and
a golden iXBRL test fixture compared byte-for-byte.

Also fixes two bugs surfaced along the way: an off-by-one in
ApiKeysPanel's scope-label split (a leftover from an earlier partial
pass), and a charset-repair test that had lost the literal en-dash it
exists to verify.

Regenerated the agent atom seed migration (skills:generate) since 27
SKILL.md files changed. Added a CLAUDE.md rule against em/en dashes,
with an explicit carve-out for the functional-dash cases above.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
2026-07-04 15:58:06 +02:00

3.0 KiB

Event Handlers Reference

Extensions subscribe via eventHandlers. The bus dispatches with Promise.allSettled(): failures are isolated.

Signature & Registration

async function handleSomeEvent(
  payload: EventPayload<'transaction.synced'>, ctx?: ExtensionContext
): Promise<void> { /* ... */ }

export const myExtension: Extension = {
  eventHandlers: [
    { eventType: 'transaction.synced', handler: handleSomeEvent },
  ],
}

ctx can be undefined in cron job contexts: always provide fallbacks.

All Event Types

Source: lib/events/types.ts. Every payload includes userId.

Event Payload
journal_entry.drafted { entry: JournalEntry, userId }
journal_entry.committed { entry: JournalEntry, userId }
journal_entry.corrected { original, storno, corrected: JournalEntry, userId }
document.uploaded { document: DocumentAttachment, userId }
invoice.created { invoice: Invoice, userId }
invoice.sent { invoice: Invoice, userId }
credit_note.created { creditNote: CreditNote, userId }
transaction.synced { transactions: Transaction[], userId }
transaction.categorized { transaction, account, taxCode, userId }
transaction.reconciled { transaction, journalEntryId, method, userId }
period.locked { period: FiscalPeriod, userId }
period.year_closed { period: FiscalPeriod, userId }
customer.created { customer: Customer, userId }
receipt.extracted { receipt, documentId, confidence, userId }
receipt.matched { receipt, transaction, confidence, autoMatched, userId }
receipt.confirmed { receipt, businessTotal, privateTotal, userId }
supplier_invoice.received { inboxItem: InvoiceInboxItem, userId }
supplier_invoice.extracted { inboxItem, confidence, userId }
supplier_invoice.confirmed { inboxItem, supplierInvoice, userId }

Standard Handler Pattern

async function handleTransactionSynced(
  payload: EventPayload<'transaction.synced'>, ctx?: ExtensionContext
): Promise<void> {
  const { transactions, userId } = payload
  const log = ctx?.log ?? console
  const settings = ctx
    ? { ...DEFAULT_SETTINGS, ...(await ctx.settings.get<Partial<MySettings>>() || {}) }
    : await getSettings(userId)

  if (!settings.featureEnabled) return  // Settings gate

  try {
    const supabase = ctx?.supabase ?? await (await import('@/lib/supabase/server')).createClient()
    // Business logic...
    await ctx?.emit({ type: 'receipt.matched', payload: { /* ... */ userId } })
  } catch (error) { log.error('Handler failed:', error) }
}

Key Rules

  1. Handle ctx = undefined: fallback for supabase, logging, settings
  2. Handlers run concurrently: order undefined, don't depend on other handlers
  3. Use settings gates: let users control features
  4. Wrap in try/catch: don't throw unhandled errors
  5. Emit events for cascading pipelines: e.g., OCR emits receipt.extracted → triggers push notifications