private _execModule()

in packages/jest-runtime/src/index.ts [1400:1513]
86 lines of code
11 McCabe index (conditional complexity)

  private _execModule(
    localModule: InitialModule,
    options: InternalModuleOptions | undefined,
    moduleRegistry: ModuleRegistry,
    from: string | null,
  ) {
    if (this.isTornDown) {
      this._logFormattedReferenceError(
        'You are trying to `import` a file after the Jest environment has been torn down.',
      );
      process.exitCode = 1;
      return;
    }

    // If the environment was disposed, prevent this module from being executed.
    if (!this._environment.global) {
      return;
    }

    const module = localModule as Module;

    const filename = module.filename;
    const lastExecutingModulePath = this._currentlyExecutingModulePath;
    this._currentlyExecutingModulePath = filename;
    const origCurrExecutingManualMock = this._isCurrentlyExecutingManualMock;
    this._isCurrentlyExecutingManualMock = filename;

    module.children = [];

    Object.defineProperty(module, 'parent', {
      enumerable: true,
      get() {
        const key = from || '';
        return moduleRegistry.get(key) || null;
      },
    });

    module.paths = this._resolver.getModulePaths(module.path);
    Object.defineProperty(module, 'require', {
      value: this._createRequireImplementation(module, options),
    });

    const transformedCode = this.transformFile(filename, options);

    let compiledFunction: ModuleWrapper | null = null;

    const script = this.createScriptFromCode(transformedCode, filename);

    let runScript: RunScriptEvalResult | null = null;

    const vmContext = this._environment.getVmContext();

    if (vmContext) {
      runScript = script.runInContext(vmContext, {filename});
    }

    if (runScript !== null) {
      compiledFunction = runScript[EVAL_RESULT_VARIABLE];
    }

    if (compiledFunction === null) {
      this._logFormattedReferenceError(
        'You are trying to `import` a file after the Jest environment has been torn down.',
      );
      process.exitCode = 1;
      return;
    }

    const jestObject = this._createJestObjectFor(filename);

    this.jestObjectCaches.set(filename, jestObject);

    const lastArgs: [Jest | undefined, ...Array<Global.Global>] = [
      this._config.injectGlobals ? jestObject : undefined, // jest object
      ...this._config.sandboxInjectedGlobals.map<Global.Global>(
        globalVariable => {
          if (this._environment.global[globalVariable]) {
            return this._environment.global[globalVariable];
          }

          throw new Error(
            `You have requested '${globalVariable}' as a global variable, but it was not present. Please check your config or your global environment.`,
          );
        },
      ),
    ];

    if (!this._mainModule && filename === this._testPath) {
      this._mainModule = module;
    }

    Object.defineProperty(module, 'main', {
      enumerable: true,
      value: this._mainModule,
    });

    try {
      compiledFunction.call(
        module.exports,
        module, // module object
        module.exports, // module exports
        module.require, // require implementation
        module.path, // __dirname
        module.filename, // __filename
        // @ts-expect-error
        ...lastArgs.filter(notEmpty),
      );
    } catch (error: any) {
      this.handleExecutionError(error, module);
    }

    this._isCurrentlyExecutingManualMock = origCurrExecutingManualMock;
    this._currentlyExecutingModulePath = lastExecutingModulePath;
  }