Function withFixture

src/services/vcr.ts:39–86

* Generic fixture management helper * Handles caching, reading, writing fixtures for any data type

(
  input: unknown,
  fixtureName: string,
  f: () => Promise<T>,
)

 * Handles caching, reading, writing fixtures for any data type
 */
async function withFixture<T>(
  input: unknown,
  fixtureName: string,
  f: () => Promise<T>,
): Promise<T> {
  if (!shouldUseVCR()) {
    return await f()
  }

  // Create hash of input for fixture filename
  const hash = createHash('sha1')
    .update(jsonStringify(input))
    .digest('hex')
    .slice(0, 12)
  const filename = join(
    process.env.CLAUDE_CODE_TEST_FIXTURES_ROOT ?? getCwd(),
    `fixtures/${fixtureName}-${hash}.json`,
  )

  // Fetch cached fixture
  try {
    const cached = jsonParse(
      await readFile(filename, { encoding: 'utf8' }),
    ) as T
    return cached
  } catch (e: unknown) {
    const code = getErrnoCode(e)
    if (code !== 'ENOENT') {
      throw e
    }
  }

  if ((env.isCI || process.env.CI) && !isEnvTruthy(process.env.VCR_RECORD)) {
    throw new Error(
      `Fixture missing: ${filename}. Re-run tests with VCR_RECORD=1, then commit the result.`,
    )
  }

  // Create & write new fixture
  const result = await f()

  await mkdir(dirname(filename), { recursive: true })
  await writeFile(filename, jsonStringify(result, null, 2), {
    encoding: 'utf8',
  })

  return result
}

export async function withVCR(
  messages: Message[],