@log4js-node/sandboxed-module
v2.2.1
Published
A sandboxed Node.js module loader that lets you inject dependencies into your modules.
Downloads
156
Readme
sandboxed-module
NOTE: this is a fork of felixge's original, that doesn't seem to be maintained at the moment. If felixge's starts to be maintained again, this module will be deprecated.
A sandboxed node.js module loader that lets you inject dependencies into your modules.
Installation
npm install @log4js-node/sandboxed-module
Usage
var SandboxedModule = require('sandboxed-module');
var user = SandboxedModule.require('./user', {
requires: {'mysql': {fake: 'mysql module'}},
globals: {myGlobal: 'variable'},
locals: {myLocal: 'other variable'},
});
What to do with this
This module is intended to ease dependency injection for unit testing. However, feel free to use it for whatever crimes you can think of.
API
SandboxedModule.load(moduleId, [options])
Returns a new SandboxedModule
where moduleId
is a regular module path / id
as you would normally pass into require()
. The new module will be loaded in
its own v8 context, but otherwise have access to the normal node.js
environment.
options
is an optional object that can be used to inject any of the
following:
requires:
An object containingmoduleId
s and the values to inject for them when required by the sandboxed module. This does not affect children of the sandboxed module.globals:
An object of global variables to inject into the sandboxed module.locals:
An object of local variables to inject into the sandboxed module.sourceTransformers:
An object of named functions to transform the source code of the sandboxed module's file (e.g. transpiler language, code coverage).singleOnly:
If false, modules that are required by the sandboxed module will not be sandboxed. By default all modules required by the sandboxedModule will be sandboxed using the same options that were used for the original sandboxed module.sourceTransformersSingleOnly:
If false, the source transformers will not be run against modules required by the sandboxed module. By default it will take the same value assingleOnly
.ignoreMissing:
If true, injected modules will not be required to have a corresponding file on the file system. By default this is false.
SandboxedModule.require(moduleId, [options])
Identical to SandboxedModule.load()
, but returns sandboxedModule.exports
directly.
SandboxedModule.configure(options)
Sets options globally across all uses of SandboxedModule.load()
and
SandboxedModule.require()
. This way, a commonly needed require, global, local,
or sourceTransformer can be specified once across all sandboxed modules.
SandboxedModule.registerBuiltInSourceTransformer(name)
Enables a built-in source transformer by name. Currently, SandboxedModule ships with two built in source transformers:
- "coffee" - Compiles source with CoffeeScript [Enabled by default for backwards compatibility].
Be sure to run
require('coffee-script').register()
orrequire('coffee-script/register')
as well. - "istanbul" - Instruments sources via istanbul when istanbul code coverage is running.
For example, if you'd like to use SandboxedModule in conjunction with istanbul,
just run SandboxedModule.registerBuiltInSourceTransformer('istanbul')
.
sandboxedModule.filename
The full path to the module.
sandboxedModule.module
The underlaying node.js Module
instance.
sandboxedModule.exports
A getter returning the sandboxedModule.module.exports
object.
sandboxedModule.globals
The global object of the v8 context this module was loaded in. Modifications to this object will be reflected in the sandboxed module.
sandboxedModule.locals
The local variables injected into the sandboxed module using a closure. Modifying this object has no effect on the state of the sandbox.
sandboxedModule.required
An object holding a list of all module required by the sandboxed module itself.
The keys are the moduleId
s used for the require calls.
sandboxedModule.sourceTransformers
An object of named functions which will transform the source code required with
SandboxedModule.require
. For example, CoffeeScript &
istanbul support is implemented with
built-in sourceTransformer functions (see #registerBuiltInSourceTransformer
).
A source transformer receives the source (as it's been transformed thus far) and must return the transformed source (whether it's changed or unchanged).
An example source transformer to change all instances of the number "3" to "5" would look like this:
SandboxedModule.require('../fixture/baz', {
sourceTransformers: {
turn3sInto5s: function(source) {
return source.replace(/3/g,'5');
}
}
})
License
sandboxed-module is licensed under the MIT license.