wrapup
v1.0.7
Published
wraps up node packages for web development
Downloads
621
Readme
WrapUp?
- 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.
Installation
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")()
Usage
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).
require()
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)
.
cli
wrup browser --require colors colors --require someName ./path/to/otherModule --require someOtherPackage
js
var wrup = require("wrapup")(/*...options...*/) // require + instantiate
wrup.require("colors", "colors")
.require("someName", "./path/to/otherModule")
.require("someOtherPackage")
.up(function(err, js){
console.log(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")
require("someOtherPackage")
watch
WrapUp supports watching source files and rebuilds automatically whenever one of these changes.
cli
--watch
js
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.
options
Set some options for the output.
var wrapup = require('wrapup')
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 atemp.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, usinguglifyjs --spidermonkey
.
cli
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
notes:
- 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
js
wrup.require(/*...*/)
.require(/*...*/)
.up()
Transforms
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
wrup({
transforms: [
'es6ify',
'./myTransformModule',
{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
Examples
cli
# 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
JavaScript
coming soon... :)