Function mergeAdjacentUserMessages

src/utils/messages.ts:2451–2464

(
  msgs: (UserMessage | AssistantMessage)[],
)

}

function mergeAdjacentUserMessages(
  msgs: (UserMessage | AssistantMessage)[],
): (UserMessage | AssistantMessage)[] {
  const out: (UserMessage | AssistantMessage)[] = []
  for (const m of msgs) {
    const prev = out.at(-1)
    if (m.type === 'user' && prev?.type === 'user') {
      out[out.length - 1] = mergeUserMessages(prev, m) // lvalue — can't use .at()
    } else {
      out.push(m)
    }
  }
  return out
}

/**
 * In thecontent[] list on a UserMessage, tool_result blocks much come first