Function withVCR

src/services/vcr.ts:89–162

(
  messages: Message[],
  f: () => Promise<(AssistantMessage | StreamEvent | SystemAPIErrorMessage)[]>,
)

}

export async function withVCR(
  messages: Message[],
  f: () => Promise<(AssistantMessage | StreamEvent | SystemAPIErrorMessage)[]>,
): Promise<(AssistantMessage | StreamEvent | SystemAPIErrorMessage)[]> {
  if (!shouldUseVCR()) {
    return await f()
  }

  const messagesForAPI = normalizeMessagesForAPI(
    messages.filter(_ => {
      if (_.type !== 'user') {
        return true
      }
      if (_.isMeta) {
        return false
      }
      return true
    }),
  )

  const dehydratedInput = mapMessages(
    messagesForAPI.map(_ => _.message.content),
    dehydrateValue,
  )
  const filename = join(
    process.env.CLAUDE_CODE_TEST_FIXTURES_ROOT ?? getCwd(),
    `fixtures/${dehydratedInput.map(_ => createHash('sha1').update(jsonStringify(_)).digest('hex').slice(0, 6)).join('-')}.json`,
  )

  // Fetch cached fixture
  try {
    const cached = jsonParse(
      await readFile(filename, { encoding: 'utf8' }),
    ) as { output: (AssistantMessage | StreamEvent)[] }
    cached.output.forEach(addCachedCostToTotalSessionCost)
    return cached.output.map((message, index) =>
      mapMessage(message, hydrateValue, index, randomUUID()),
    )
  } catch (e: unknown) {
    const code = getErrnoCode(e)
    if (code !== 'ENOENT') {
      throw e
    }
  }

  if (env.isCI && !isEnvTruthy(process.env.VCR_RECORD)) {
    throw new Error(
      `Anthropic API fixture missing: ${filename}. Re-run tests with VCR_RECORD=1, then commit the result. Input messages:\n${jsonStringify(dehydratedInput, null, 2)}`,
    )
  }

  // Create & write new fixture
  const results = await f()
  if (env.isCI && !isEnvTruthy(process.env.VCR_RECORD)) {
    return results
  }

  await mkdir(dirname(filename), { recursive: true })