Method loadCjsAsEsm

packages/jest-runtime/src/internals/EsmLoader.ts:1272–1303

(
    from: string,
    modulePath: string,
    context: VMContext,
  )

  }

  private loadCjsAsEsm(
    from: string,
    modulePath: string,
    context: VMContext,
  ): SyntheticModule | Promise<VMModule> {
    const registry = this.registries.getActiveEsmRegistry();
    const cached = registry.get(modulePath);
    if (cached) {
      return cached as SyntheticModule | Promise<VMModule>;
    }

    let synthetic: SyntheticModule;
    try {
      synthetic = this.buildCjsAsEsmSyntheticModule(from, modulePath, context);
    } catch (error) {
      if (!isCjsParseError(error)) {
        throw error;
      }
      // The file may contain ESM syntax with no ESM marker (.mjs /
      // "type":"module") - try loading as native ESM. If the ESM parser also
      // rejects it, the original CJS error was the genuine one.
      return this.loadEsmModule(modulePath).catch(esmError => {
        throw isError(esmError) && esmError.name === 'SyntaxError'
          ? error
          : esmError;
      });
    }

    const evaluated = evaluateSyntheticModule(synthetic);
    registry.set(modulePath, evaluated);
    return evaluated;
  }

  private async importMock<T = unknown>(
    moduleName: string,