script.runInNewContext()

script.runInNewContext([sandbox][, options])

Similar to vm.runInNewContext() but a method of a precompiled Script object. script.runInNewContext() contextifies sandbox if passed or creates a new contextified sandbox if it's omitted, and then runs script's compiled code with the sandbox as the global object and returns the result. Running code does not have access to local scope.

script.runInNewContext() takes the same options as script.runInThisContext().

Example: compile code that sets a global variable, then execute the code multiple times in different contexts. These globals are set on and contained in the sandboxes.

const util = require('util');
const vm = require('vm');

const sandboxes = [{}, {}, {}];

const script = new vm.Script('globalVar = "set"');

sandboxes.forEach((sandbox) => {
  script.runInNewContext(sandbox);
});

console.log(util.inspect(sandboxes));

// [{ globalVar: 'set' }, { globalVar: 'set' }, { globalVar: 'set' }]

Note that running untrusted code is a tricky business requiring great care. script.runInNewContext() is quite useful, but safely running untrusted code requires a separate process.