Function createServer

src/server.ts:1110–2978

(
  fixtures: Fixture[],
  options?: MockServerOptions,
  mounts?: Array<{ path: string; handler: Mountable }>,
  serviceFixtures?: ServiceFixtures,
)

// (e.g. LLMock) may mutate it after the server starts and changes will
// be visible immediately. This is intentional — do not copy the array.
export async function createServer(
  fixtures: Fixture[],
  options?: MockServerOptions,
  mounts?: Array<{ path: string; handler: Mountable }>,
  serviceFixtures?: ServiceFixtures,
): Promise<ServerInstance> {
  const host = options?.host ?? "127.0.0.1";
  const port = options?.port ?? 0;
  const logger = new Logger(options?.logLevel ?? "silent");
  const registry = options?.metrics ? createMetricsRegistry() : undefined;
  const serverOptions = options ?? {};
  const defaults = {
    latency: serverOptions.latency ?? 0,
    chunkSize: Math.max(1, serverOptions.chunkSize ?? DEFAULT_CHUNK_SIZE),
    replaySpeed: serverOptions.replaySpeed ?? 1.0,
    logger,
    get chaos() {
      return serverOptions.chaos;
    },
    registry,
    get record() {
      return serverOptions.record;
    },
    get strict() {
      return serverOptions.strict;
    },
    get requestTransform() {
      return serverOptions.requestTransform;
    },
    get falQueue() {
      return serverOptions.falQueue;
    },
    get openRouterVideo() {
      return serverOptions.openRouterVideo;
    },
    get veoVideo() {
      return serverOptions.veoVideo;
    },
    get grokVideo() {
      return serverOptions.grokVideo;
    },
  };

  // Validate chaos config rates
  if (options?.chaos) {
    const chaosRates = [
      { name: "dropRate", value: options.chaos.dropRate },
      { name: "malformedRate", value: options.chaos.malformedRate },
      { name: "disconnectRate", value: options.chaos.disconnectRate },
    ];
    for (const { name, value } of chaosRates) {
      if (value !== undefined && (value < 0 || value > 1)) {
        logger.warn(`Chaos ${name} (${value}) is outside 0-1 range — will be clamped at runtime`);
      }
    }
  }

  // Validate poll-progression thresholds (resolveProgression treats