{"record":{"id":"32583259db0f6450","repo":"toon-format/toon","slug":"mismatched-endarray-event","errorCode":null,"errorMessage":"Mismatched endArray event","messagePattern":"Mismatched endArray event","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/toon/src/decode/event-builder.ts","lineNumber":126,"sourceCode":"        }\n        else if (parent.type === 'array') {\n          parent.arr.push(arr)\n        }\n\n        stack.push({ type: 'array', arr })\n      }\n\n      break\n    }\n\n    case 'endArray': {\n      if (stack.length === 0) {\n        throw new Error('Unexpected endArray event')\n      }\n\n      const context = stack.pop()!\n      if (context.type !== 'array') {\n        throw new Error('Mismatched endArray event')\n      }\n\n      if (stack.length === 0) {\n        state.root = context.arr\n      }\n\n      break\n    }\n\n    case 'key': {\n      if (stack.length === 0) {\n        throw new Error('Key event outside of object context')\n      }\n\n      const parent = stack[stack.length - 1]!\n      if (parent.type !== 'object') {\n        throw new Error('Key event outside of object context')\n      }","sourceCodeStart":108,"sourceCodeEnd":144,"githubUrl":"https://github.com/toon-format/toon/blob/604eac266e35166bed6f5b9e3bd586e9c60a9330/packages/toon/src/decode/event-builder.ts#L108-L144","documentation":"applyEvent popped a context on endArray but the open context was not an array (e.g. an object). Start and end kinds must match.","triggerScenarios":"A stream where startObject is closed by endArray, passed to buildValueFromEvents/Async.","commonSituations":"Custom emitters swapping end event names; state-tracking bugs in streaming parsers.","solutions":["Emit endObject to close startObject, endArray to close startArray","Fix nesting tracking in the event producer","Validate matched start/end kinds before consuming"],"exampleFix":"// before\n[{type:'startObject'},{type:'endArray'}] // mismatched\n// after\n[{type:'startObject'},{type:'endObject'}]","handlingStrategy":"validation","validationCode":"function endArrayKindsMatch(events) {\n  const stack = []\n  for (const ev of events) {\n    if (ev.type === 'startObject') stack.push('object')\n    else if (ev.type === 'startArray') stack.push('array')\n    else if (ev.type === 'endObject') { if (stack.pop() !== 'object') return false }\n    else if (ev.type === 'endArray') { if (stack.pop() !== 'array') return false }\n  }\n  return stack.length === 0\n}","typeGuard":null,"tryCatchPattern":"try {\n  const value = buildValueFromEvents(events)\n} catch (e) {\n  if (e.message === 'Mismatched endArray event') {\n    throw new Error('Crossed nesting: endArray closed a non-array context')\n  }\n  throw e\n}","preventionTips":["Close containers in strict LIFO order with the matching end kind","Unit-test deeply nested object/array mixes through your emitter","Derive end-event emission from the same stack used at start"],"tags":["event-stream","decoder","toon"],"backgroundTag":"malformed-event-stream","analyzedSha":"604eac266e35166bed6f5b9e3bd586e9c60a9330","analyzedAt":"2026-08-31T11:09:25.043Z","schemaVersion":2},"datasetVersion":"2026-09-01T08:17:40.651Z"}