Method exec

packages/jest-runtime/src/internals/ModuleExecutor.ts:90–177

(
    localModule: InitialModule,
    options: TransformOptions | undefined,
    moduleRegistry: ModuleRegistry,
    from: string | null,
    moduleName: string | undefined,
  )

  }

  exec(
    localModule: InitialModule,
    options: TransformOptions | undefined,
    moduleRegistry: ModuleRegistry,
    from: string | null,
    moduleName: string | undefined,
  ): ExecResult {
    if (!this.environment.global) {
      return 'env-disposed';
    }

    const module = localModule as Module;

    const filename = module.filename;
    const origCurrExecutingManualMock = this.currentlyExecutingManualMock;
    this.currentlyExecutingManualMock = filename;

    try {
      module.children = [];

      Object.defineProperty(module, 'parent', {
        enumerable: true,
        get() {
          const key = from || '';
          return moduleRegistry.get(key) || null;
        },
      });
      const modulePaths = this.resolution.getModulePaths(module.path);
      const globalPaths = this.resolution.getGlobalPaths(moduleName);
      module.paths = [...modulePaths, ...globalPaths];

      Object.defineProperty(module, 'require', {
        value: this.requireBuilder.for(localModule, options),
      });

      const transformedCode = this.transformCache.transform(filename, options);

      const compiledFunction = this.compile(transformedCode, filename);
      if (compiledFunction === null) {
        return 'env-disposed';
      }

      const jestObject = this.jestGlobals.jestObjectFor(filename);

      const lastArgs: [Jest | undefined, ...Array<Global.Global>] = [
        this.config.injectGlobals ? jestObject : undefined,
        ...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.`,
            );
          },
        ),
      ];