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authorFlorian Dold <florian.dold@gmail.com>2017-05-03 15:35:00 +0200
committerFlorian Dold <florian.dold@gmail.com>2017-05-03 15:35:00 +0200
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+# amdefine
+
+A module that can be used to implement AMD's define() in Node. This allows you
+to code to the AMD API and have the module work in node programs without
+requiring those other programs to use AMD.
+
+## Usage
+
+**1)** Update your package.json to indicate amdefine as a dependency:
+
+```javascript
+ "dependencies": {
+ "amdefine": ">=0.1.0"
+ }
+```
+
+Then run `npm install` to get amdefine into your project.
+
+**2)** At the top of each module that uses define(), place this code:
+
+```javascript
+if (typeof define !== 'function') { var define = require('amdefine')(module) }
+```
+
+**Only use these snippets** when loading amdefine. If you preserve the basic structure,
+with the braces, it will be stripped out when using the [RequireJS optimizer](#optimizer).
+
+You can add spaces, line breaks and even require amdefine with a local path, but
+keep the rest of the structure to get the stripping behavior.
+
+As you may know, because `if` statements in JavaScript don't have their own scope, the var
+declaration in the above snippet is made whether the `if` expression is truthy or not. If
+RequireJS is loaded then the declaration is superfluous because `define` is already already
+declared in the same scope in RequireJS. Fortunately JavaScript handles multiple `var`
+declarations of the same variable in the same scope gracefully.
+
+If you want to deliver amdefine.js with your code rather than specifying it as a dependency
+with npm, then just download the latest release and refer to it using a relative path:
+
+[Latest Version](https://github.com/jrburke/amdefine/raw/latest/amdefine.js)
+
+### amdefine/intercept
+
+Consider this very experimental.
+
+Instead of pasting the piece of text for the amdefine setup of a `define`
+variable in each module you create or consume, you can use `amdefine/intercept`
+instead. It will automatically insert the above snippet in each .js file loaded
+by Node.
+
+**Warning**: you should only use this if you are creating an application that
+is consuming AMD style defined()'d modules that are distributed via npm and want
+to run that code in Node.
+
+For library code where you are not sure if it will be used by others in Node or
+in the browser, then explicitly depending on amdefine and placing the code
+snippet above is suggested path, instead of using `amdefine/intercept`. The
+intercept module affects all .js files loaded in the Node app, and it is
+inconsiderate to modify global state like that unless you are also controlling
+the top level app.
+
+#### Why distribute AMD-style modules via npm?
+
+npm has a lot of weaknesses for front-end use (installed layout is not great,
+should have better support for the `baseUrl + moduleID + '.js' style of loading,
+single file JS installs), but some people want a JS package manager and are
+willing to live with those constraints. If that is you, but still want to author
+in AMD style modules to get dynamic require([]), better direct source usage and
+powerful loader plugin support in the browser, then this tool can help.
+
+#### amdefine/intercept usage
+
+Just require it in your top level app module (for example index.js, server.js):
+
+```javascript
+require('amdefine/intercept');
+```
+
+The module does not return a value, so no need to assign the result to a local
+variable.
+
+Then just require() code as you normally would with Node's require(). Any .js
+loaded after the intercept require will have the amdefine check injected in
+the .js source as it is loaded. It does not modify the source on disk, just
+prepends some content to the text of the module as it is loaded by Node.
+
+#### How amdefine/intercept works
+
+It overrides the `Module._extensions['.js']` in Node to automatically prepend
+the amdefine snippet above. So, it will affect any .js file loaded by your
+app.
+
+## define() usage
+
+It is best if you use the anonymous forms of define() in your module:
+
+```javascript
+define(function (require) {
+ var dependency = require('dependency');
+});
+```
+
+or
+
+```javascript
+define(['dependency'], function (dependency) {
+
+});
+```
+
+## RequireJS optimizer integration. <a name="optimizer"></name>
+
+Version 1.0.3 of the [RequireJS optimizer](http://requirejs.org/docs/optimization.html)
+will have support for stripping the `if (typeof define !== 'function')` check
+mentioned above, so you can include this snippet for code that runs in the
+browser, but avoid taking the cost of the if() statement once the code is
+optimized for deployment.
+
+## Node 0.4 Support
+
+If you want to support Node 0.4, then add `require` as the second parameter to amdefine:
+
+```javascript
+//Only if you want Node 0.4. If using 0.5 or later, use the above snippet.
+if (typeof define !== 'function') { var define = require('amdefine')(module, require) }
+```
+
+## Limitations
+
+### Synchronous vs Asynchronous
+
+amdefine creates a define() function that is callable by your code. It will
+execute and trace dependencies and call the factory function *synchronously*,
+to keep the behavior in line with Node's synchronous dependency tracing.
+
+The exception: calling AMD's callback-style require() from inside a factory
+function. The require callback is called on process.nextTick():
+
+```javascript
+define(function (require) {
+ require(['a'], function(a) {
+ //'a' is loaded synchronously, but
+ //this callback is called on process.nextTick().
+ });
+});
+```
+
+### Loader Plugins
+
+Loader plugins are supported as long as they call their load() callbacks
+synchronously. So ones that do network requests will not work. However plugins
+like [text](http://requirejs.org/docs/api.html#text) can load text files locally.
+
+The plugin API's `load.fromText()` is **not supported** in amdefine, so this means
+transpiler plugins like the [CoffeeScript loader plugin](https://github.com/jrburke/require-cs)
+will not work. This may be fixable, but it is a bit complex, and I do not have
+enough node-fu to figure it out yet. See the source for amdefine.js if you want
+to get an idea of the issues involved.
+
+## Tests
+
+To run the tests, cd to **tests** and run:
+
+```
+node all.js
+node all-intercept.js
+```
+
+## License
+
+New BSD and MIT. Check the LICENSE file for all the details.