{"record":{"id":"286600438970ec15","repo":"deepseek-ai/deepseek-harness","slug":"sourceeventseqs-must-reference-earlier-events-n","errorCode":null,"errorMessage":"sourceEventSeqs must reference earlier events: ${nonEarlierSource} >= current seq ${event.seq}","messagePattern":"sourceEventSeqs must reference earlier events: (.+?) >= current seq (.+?)","errorType":"validation","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/core/session/src/surface.ts","lineNumber":236,"sourceCode":"    if (!Array.isArray(raw)) {\n      throw new Error(`sourceEventSeqs on event at seq ${event.seq} must be an array when present`)\n    }\n    if (raw.length === 0 && event.type !== 'assistant/message') {\n      throw new Error('sourceEventSeqs must not be empty except on assistant/message')\n    }\n    let nonEarlierSource: number | undefined\n    for (const source of raw) {\n      if (!isEventSeq(source)) {\n        throw new Error(`session event \"${event.type}\" sourceEventSeqs must densely contain non-negative safe integers`)\n      }\n      sources.add(source)\n      if (nonEarlierSource === undefined && source >= event.seq) nonEarlierSource = source\n    }\n    if (sources.size !== raw.length) {\n      throw new Error('sourceEventSeqs must not contain duplicates')\n    }\n    if (nonEarlierSource !== undefined) {\n      throw new Error(`sourceEventSeqs must reference earlier events: ${nonEarlierSource} >= current seq ${event.seq}`)\n    }\n  }\n  const missing = shadowedSeqs.filter(seq => !sources.has(seq))\n  if (missing.length > 0) {\n    throw new Error(`surface replace: sourceEventSeqs must include every shadowed surface node; missing ${missing.join(', ')}`)\n  }\n}\n\n/** Locate one replacement range without mutating the current fold state. */\nfunction replacementRange(\n  state: SurfaceFoldState,\n  op: Extract<SurfaceOp, { op: 'replace' }>,\n): Pick<SurfaceReplacePlan, 'startIdx' | 'endIdx' | 'shadowedSeqs'> {\n  const startIdx = state.nodes.indexOf(op.start)\n  if (startIdx === -1) {\n    throw new Error(`surface replace: start seq ${op.start} not found in surface`)\n  }\n  const endIdx = state.nodes.indexOf(op.end)","sourceCodeStart":218,"sourceCodeEnd":254,"githubUrl":"https://github.com/deepseek-ai/deepseek-harness/blob/b150a551b8d465e31e418e1b2eaf5e79bbb7d28e/packages/core/session/src/surface.ts#L218-L254","documentation":"Error \"sourceEventSeqs must reference earlier events: ${nonEarlierSource} >= current seq ${event.seq}\" thrown in deepseek-ai/deepseek-harness.","triggerScenarios":"Thrown at packages/core/session/src/surface.ts:236 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"b150a551b8d465e31e418e1b2eaf5e79bbb7d28e","analyzedAt":"2026-08-24T18:12:29.105Z","schemaVersion":2},"datasetVersion":"2026-08-24T22:17:12.610Z"}