bare-vm

stable

bare-vm — Isolated JavaScript contexts for Bare.

npm i bare-vm

Usage

const vm = require('bare-vm')

const context = vm.createContext()
vm.runInContext('x = 40; x += 2', context) // 42

vm.runInNewContext('x = 40; x += 2') // 42

API

Functions

`createContext(): Record<string | number | symbol, unknown>`

Create and return a new isolated global context that code can be run in with runInContext().

Returns Record<string | number | symbol, unknown> — A new isolated global context that code can be run in with runInContext().

`runInContext`

runInContext(code: string, context: Record<string | number | symbol, unknown>, opts?: {
    filename?: string
    offset?: number
  }): unknown

Run code inside context, a context previously created with createContext(), and return the result.

Parameters

Parameter	Type	Default	Description
`code`	`string`	—	The JavaScript source to run.
`context`	`Record<string \| number \| symbol, unknown>`	—	A context previously created with `createContext()`.
`opts?`	`{ filename?: string offset?: number }`	—	Options. `filename` is the script name used in stack traces (default `'<anonymous>'`); `offset` shifts the reported line numbers (default `0`, also accepted as `lineOffset` for Node.js compatibility).

Returns unknown — The completion value of code.

`runInNewContext`

runInNewContext(code: string, opts?: {
    filename?: string
    offset?: number
  }): unknown

Create a new context and run code inside it in one step, equivalent to calling createContext() followed by runInContext().