> [!WARNING] Deno compatibility > The `importModuleDynamically` parameter is not supported. If given a `contextObject`, the `vm.createContext()` method will [prepare that object](https://nodejs.org/docs/latest-v22.x/api/vm.html#what-does-it-mean-to-contextify-an-object) and return a reference to it so that it can be used in `[runInContext](../.././node__vm.d.ts/~/runInContext)` or [`script.runInContext()`](https://nodejs.org/docs/latest-v22.x/api/vm.html#scriptrunincontextcontextifiedobject-options). Inside such scripts, the `contextObject` will be the global object, retaining all of its existing properties but also having the built-in objects and functions any standard [global object](https://es5.github.io/#x15.1) has. Outside of scripts run by the vm module, global variables will remain unchanged. ```js import vm from 'node:vm'; global.globalVar = 3; const context = { globalVar: 1 }; vm.createContext(context); vm.runInContext('globalVar *= 2;', context); console.log(context); // Prints: { globalVar: 2 } console.log(global.globalVar); // Prints: 3 ``` If `contextObject` is omitted (or passed explicitly as `undefined`), a new, empty `contextified` object will be returned. The `vm.createContext()` method is primarily useful for creating a single context that can be used to run multiple scripts. For instance, if emulating a web browser, the method can be used to create a single context representing a window's global object, then run all `