Function processHookJSONOutput

source code/utils/hooks.ts:491–739

({
  json,
  command,
  hookName,
  toolUseID,
  hookEvent,
  expectedHookEvent,
  stdout,
  stderr,
  exitCode,
  durationMs,
}: {
  json: SyncHookJSONOutput
  command: string
  hookName: string
  toolUseID: string
  hookEvent: HookEvent
  expectedHookEvent?: HookEvent
  stdout?: string
  stderr?: string
  exitCode?: number
  durationMs?: number
})

}

function processHookJSONOutput({
  json,
  command,
  hookName,
  toolUseID,
  hookEvent,
  expectedHookEvent,
  stdout,
  stderr,
  exitCode,
  durationMs,
}: {
  json: SyncHookJSONOutput
  command: string
  hookName: string
  toolUseID: string
  hookEvent: HookEvent
  expectedHookEvent?: HookEvent
  stdout?: string
  stderr?: string
  exitCode?: number
  durationMs?: number
}): Partial<HookResult> {
  const result: Partial<HookResult> = {}

  // At this point we know it's a sync response
  const syncJson = json

  // Handle common elements
  if (syncJson.continue === false) {
    result.preventContinuation = true
    if (syncJson.stopReason) {
      result.stopReason = syncJson.stopReason
    }
  }

  if (json.decision) {
    switch (json.decision) {
      case 'approve':
        result.permissionBehavior = 'allow'
        break
      case 'block':
        result.permissionBehavior = 'deny'
        result.blockingError = {
          blockingError: json.reason || 'Blocked by hook',
          command,
        }
        break
      default:
        // Handle unknown decision types as errors
        throw new Error(
          `Unknown hook decision type: ${json.decision}. Valid types are: approve, block`,
        )
    }
  }

  // Handle systemMessage field
  if (json.systemMessage) {