nestjs/nest · error

The module "${opaqueToken.module}" is taking ${formattedTime

Error message

The module "${opaqueToken.module}" is taking ${formattedTimeSpent}ms to serialize, this may be caused by larger objects statically assigned to the module. Consider changing the "moduleIdGeneratorAlgorithm" option to "reference" to improve the performance.

What it means

Error "The module "${opaqueToken.module}" is taking ${formattedTimeSpent}ms to serialize, this may be caused by larger objects statically assigned to the module. Consider changing the "moduleIdGeneratorAlgorithm" option to "reference" to improve the performance." thrown in nestjs/nest.

Source

Thrown at packages/core/injector/opaque-key-factory/deep-hashed-module-opaque-key-factory.ts:58

  public createForDynamic(
    moduleCls: Type<unknown>,
    dynamicMetadata: Omit<DynamicModule, 'module'>,
  ): string {
    const moduleId = this.getModuleId(moduleCls);
    const moduleName = this.getModuleName(moduleCls);
    const opaqueToken = {
      id: moduleId,
      module: moduleName,
      dynamic: dynamicMetadata,
    };
    const start = performance.now();
    const opaqueTokenString = this.getStringifiedOpaqueToken(opaqueToken);
    const timeSpentInMs = performance.now() - start;

    if (timeSpentInMs > 10) {
      const formattedTimeSpent = timeSpentInMs.toFixed(2);
      this.logger.warn(
        `The module "${opaqueToken.module}" is taking ${formattedTimeSpent}ms to serialize, this may be caused by larger objects statically assigned to the module. Consider changing the "moduleIdGeneratorAlgorithm" option to "reference" to improve the performance.`,
      );
    }

    return this.hashString(opaqueTokenString);
  }

  public getStringifiedOpaqueToken(opaqueToken: object | undefined): string {
    // Uses safeStringify instead of JSON.stringify to support circular dynamic modules
    // The replacer function is also required in order to obtain real class names
    // instead of the unified "Function" key
    return opaqueToken ? stringify(opaqueToken, this.replacer) : '';
  }

  public getModuleId(metatype: Type<unknown>): string {
    let moduleId = this.moduleIdsCache.get(metatype);
    if (moduleId) {
      return moduleId;

View on GitHub (pinned to dd75d7bd8c)

When it happens

Trigger: Thrown at packages/core/injector/opaque-key-factory/deep-hashed-module-opaque-key-factory.ts:58 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nestjs/nest@dd75d7bd8c (2026-08-21). Data as JSON: /api/errors/174384c2aa1fd958. Report an issue: GitHub.