wraps up your node modules into web modules
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  • WrapUp compiles CommonJS 1.0 modules for the browser.
  • WrapUp does not try to have a working require implementation for the browser, infact the loader WrapUp uses is incredibly simple.
  • WrapUp ignores duplicates that may be present when using npm to install packages.
  • WrapUp supports building multiple versions of the same package.
  • WrapUp supports circular module dependencies.
  • WrapUp can watch source files for changes and rebuild automatically.
  • WrapUp can convert CommonJS modules to AMD modules.

Build Status Dependency Status


WrapUp is installed via npm:

npm install wrapup -g

After that, you will have access to wrup in your cli.

wrup --help

You can also install locally:

npm install wrapup

And require WrapUp in your node javascripts:

var wrup = require("wrapup")()


In a nutshell, you tell WrapUp you require something, it calculates dependencies for something using static analysis, and compiles a single JavaScript file that only exposes that something you required. require paths inside modules are replaced with unique identifiers for brevity, and you will only be able to access directly that something you required, never dependencies (unless specifically required).


The main WrapUp method is require(namespace, module).

It resolves a module using node's own modules and packages logic, so for instance, wrup.require("colors") would look in your node_modules folder for a package named colors, then proceed to load its main. The namespace parameter is optional, but it's used to expose the module to the browser. Without a namespace, the module will be required without being assigned. A bit like doing var x = require(y) vs require(y).


wrup browser --require colors colors --require someName ./path/to/otherModule --require someOtherPackage


var wrup = require("wrapup")(/*...options...*/) // require + instantiate

wrup.require("colors", "colors")
    .require("someName", "./path/to/otherModule")
    .up(function(err, js){

The above would let you access colors and someName, while having someOtherPackage simply required without being assigned to any variable. The ouput code assigning variables would look like this:

// those are global var statements
var colors = require("colors")
var someName = require("someName")


WrapUp supports watching source files and rebuilds automatically whenever one of these changes.




Instead of using the .up() method, the .watch() method is used.

var wrup = require("wrapup")() // require + instantiate
wrup.require("y", "./moduley.js")
    .watch(function(err, js){
        fs.writeFile("path/to/wherever", js)

wrup.on("change", function(file){
    console.log(file + " changed.")

In the above example, whenever module y and any module required by module y changes, .up() is called again. The data event is fired whenever WrapUp builds, either be a direct .up() call or an .up() call triggered by a changed file. The change event is fired whenever watch is set to true and one of the source files changes.


Set some options for the output.

var wrapup = require('wrapup')
    globalize: "MyNamespace",
    compress: true
    // more options ...
  • globalize define the global scope where named modules are attached to. By default it uses global var statements.
  • compress if set to true, will compress the resulting JavaScript file using esmangle. Defaults to false.
  • output Used to specify an output file. Defaults to stdout.
  • inPath (cli: --in-path) Enforce that all modules are in a specified path. This helps security that a random file cannot require any file on the user's file system.
  • path (cli: --path) When using the AMD output mode, this will trim the first parts of the path, so -r ./foo/bar/temp --path ./foo/bar will just result in a temp.js file in the --output directory.
  • sourcemap (cli: --source-map) Specify an output file where to generate source map.
  • sourcemapURL (cli: --source-map-url) //@ sourceMappingURL value, URL to the saved sourcemap file.
  • sourcemapRoot (cli: --source-map-root) The path to the original source to be included in the source map.
  • ast the output is a JSON object of the AST, instead of JavaScript. Can be used as uglifyjs input, using uglifyjs --spidermonkey.


cli commands:

    browser [options]       output the combined javascript
    ascii                   list the dependencies as a tree
    graph [options]         create a graphviz structured dependency graph
    amd-combined [options]  convert to AMD format and combine the modules into one file
    amd [options]           convert the modules into the AMD format


  • For amd the output option should be a directory
  • For graph to generate an actual image, you need dot output. If you've installed graphviz, you can use the --output option, like --output graph.png




Using transforms you can transform any text format into something that can be parsed by the JS parser esprima. For example to precompile HTML templates or compile coffeescript or typescript into JavaScript. It's also possible to do transformations on the AST generated by the JavaScript parser esprima. This can be used on transformation tools that can work with an AST.

A source code transformation is defined as follows:

exports.src = function(module, callback){
    module.src = doSrcTransformation(module.src)
    callback(null, module)

A transformation that can work with the esprima AST is defined as:

exports.ast = function(module, callback){
    module.ast = doAstTransformation(module.ast)
    callback(null, module)

Finally browserify transforms can be used as well.

To use transforms on the command line, use:

# some custom module
wrup browser --transform ./myTransformModule
# using a package
wrup browser --transform es6ify

With the JavaScript interface

    transforms: [
        {src: function(module, callback){
            module.src = module.src + ';\n alert("wrup!")'
            callback(null, module)

Using Source Maps

The options for source-maps that can be used are --source-map and --source-map-root.

Once the .map file is created, the page with the JavaScript can be opened. It is important that the original files are accessible through http too. For example when using --require ./test/a --source-map test.map --source-map-root http://foo.com/src the file http://foo.com/src/test/a.js should be the original JavaScript module.

Using with Uglify-JS

The WrapUp output can be piped into UglifyJS if more compression options are desired. For example using the --define option to set global definitions.

wrup browser -r ./main.js --source-map ./main.map \
     | uglify -d DEV=false --compress --mangle --output ./main.min.js \
              --source-map main.map --in-source-map main.map

Using the --ast option, and the UglifyJS --spidermonkey option, the code can be piped to UglifyJS as an Abstract Syntax Tree JSON. This saves UglifyJS parsing the generated WrapUp JavaScript.

wrup browser -r ./main --ast | uglifyjs --spidermonkey -c -m --output compressed.js



# simple building a file
wrup browser --require ./main.js --output built.js

# compressing the file
wrup browser --require ./main.js --output built.js --compress

# watching, and use another global object, so MyNameSpace.modulename == module.exports of main.js
wrup browser -r modulename ./main.js --globalize MyNameSpace --compress -o path/to/file.js --watch

# export modules in the global scope with "var" statements
# this will create a "var moofx = ..." statement
wrup browser -r moofx ./moofx

# building AMD
wrup amd --require ./main.js --output ./folder-for-converted-to-amd

# building AMD with the --path option
wrup amd --require ./path/to/files/file.js --path ./path/to/files --output ./amd

# create a single optimized AMD-style using define() functions
wrup amd-combined --require ./main.js

# piping the AST JSON into uglifyjs
wrup browser --require ./main.js --ast | uglifyjs --spidermonkey -c -m

# use transforms, for example to compile coffeescript
wrup browser -r ./test.coffee --transform coffeeify

# source maps
wrup browser -r ./main.js --output test.js --source-map test.map

# generating a visual dependency graph
wrup graph -r ./main
# this requires that graphviz is installed
wrup graph -r ./main --output graph.png
# or pipe it into the "dot" command line tool
wrup graph -r ./main | dot -Tpng -o graph.png

# show an plain text dependency tree
wrup ascii -r ./main


coming soon... :)