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https://github.com/walmartlabs/little-loader

A lightweight, IE8+ JavaScript loader
https://github.com/walmartlabs/little-loader

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A lightweight, IE8+ JavaScript loader

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README 

        
***

# NOTICE:



## This repository has been archived and is not supported.



[![No Maintenance Intended](http://unmaintained.tech/badge.svg)](http://unmaintained.tech/)

***

NOTICE: SUPPORT FOR THIS PROJECT HAS ENDED 



This projected was owned and maintained by Walmart. This project has reached its end of life and Walmart no longer supports this project.



We will no longer be monitoring the issues for this project or reviewing pull requests. You are free to continue using this project under the license terms or forks of this project at your own risk. This project is no longer subject to Walmart's bug bounty program or other security monitoring.



## Actions you can take



We recommend you take the following action:



  * Review any configuration files used for build automation and make appropriate updates to remove or replace this project

  * Notify other members of your team and/or organization of this change

  * Notify your security team to help you evaluate alternative options



## Forking and transition of ownership



For [security reasons](https://www.theregister.co.uk/2018/11/26/npm_repo_bitcoin_stealer/), Walmart does not transfer the ownership of our primary repos on Github or other platforms to other individuals/organizations. Further, we do not transfer ownership of packages for public package management systems.



If you would like to fork this package and continue development, you should choose a new name for the project and create your own packages, build automation, etc.



Please review the licensing terms of this project, which continue to be in effect even after decommission.



Little Loader

=============



A lightweight, IE8+ JavaScript loader that is **actually tested**...



[![Travis Status][trav_img]][trav_site]

[![Coverage Status][cov_img]][cov_site]

![size](http://badges.herokuapp.com/size/npm/little-loader/dist/little-loader.min.js)

![size (gz)](http://badges.herokuapp.com/size/npm/little-loader/dist/little-loader.min.js?gzip=true&label=size%20(gz))



[![Sauce Test Status][sauce_img]][sauce_site]



... with a very narrow set of objectives:



* **Tested** all the way down to IE8

* Reliably **calls back** after script loads

* Captures script load **errors** down to IE8

* Really, really **small** (clocking in at `~519` minified + gzipped bytes)

* ... and **that's it**!



We currently test:



* Karma - _Travis_: PhantomJS, Firefox

* Selenium - _Travis_: PhantomJS, Firefox

* Selenium - _Sauce Labs_:

    * Windows: Firefox, Chrome, IE8-11

    * Mac: Safari



### Usage



#### Integration



Alone, little loader attaches to `window._lload` for loading your Javascript:



```html



  window._lload("http://example.com/foo.js", function (err) {

    // `err` is script load error.

    // otherwise, foo.js is loaded!

  }/*, [optional context (`this`) variable here] */);



```



If you use an AMD bundling tool (like RequireJS):



```js

define(["little-loader"], function (load) {

  load("http://example.com/foo.js", function (err) {

    // ... your code ...

  });

});

```



If you use a CommonJS bundling tool (like Webpack):



```js

var load = require("little-loader");



load("http://example.com/foo.js", function (err) {

  // ... your code ...

});

```



#### Calling



Little loader can be called in a number of ways:



```js

// Load a script and don't worry about a callback

load("http://foo.com/foo.js");



// Load, then callback (and optionally with context.)

load("http://foo.com/foo.js", callback);

load("http://foo.com/foo.js", callback, this);



// Load, call `setup(script)` on the script tag before insertion, no callback

load("http://foo.com/foo.js", {

  setup: setup,         // setup(script)

  context: this         // (optional)

});



// Load, call `setup(script)` on the script tag before insertion, then

// callback with context (two ways)

load("http://foo.com/foo.js", {

  setup: setup,         // setup(script)

  callback: callback,   // callback(err)

  context: this

});

load("http://foo.com/foo.js", {

  setup: setup,         // setup(script)

  callback: callback    // callback(err)

}, this);

```



### Installation



#### CDN



For the ready-to-use version from CDN, use



```html



```



#### NPM



To include `little-loader` as part of your own build, first install from `npm`:



```

$ npm install --save little-loader

```



The library has a UMD wrapper and should work like any other AMD or CommonJS

module with your favorite bundling tool (Webpack, RequireJS, etc.).



If you do not use a CommonJS or AMD loader tool, then little loader will be

exposed as the `window._lload` variable.



### Development



Development requires two installation steps:



```sh

$ npm install

$ npm run install-dev

```



After that, run the full lint + tests:



```sh

$ npm run check

```



You can try out the live functional tests fixtures with our static server:



```sh

$ npm run server

```



and navigate to: http://127.0.0.1:3001/test/func/fixtures/



### Tests



We run both Karma (client-side) and Selenium (functional) tests.



The **Karma** tests are faster and more flexible, but slightly "off" from

real-world use because of their execution environment. We use Karma tests to

kick the tires on our AMD and CommonJS abstractions and little, one-off use

case scenarios.



The **Selenium** tests are slower and klunky, but they are the "real deal"

executing `little-loader` in exactly the same manner as would be used on a

real web page. We use Selenium to test a core set of fundamental use cases

across all browsers in our matrix.



#### Parallel Local Tests



Our CI is setup with a specific optimized parallel workflow. To run parallel

functional tests in development, here are some helper tasks...



**Local Browsers**



```sh

$ TEST_PARALLEL=true \

  builder envs test-func-local \

  --setup=setup-local \

  --buffer \

  '[ { "TEST_FUNC_PORT": 3030, "ROWDY_SETTINGS":"local.phantomjs" },

     { "TEST_FUNC_PORT": 3040, "ROWDY_SETTINGS":"local.firefox" },

     { "TEST_FUNC_PORT": 3050, "ROWDY_SETTINGS":"local.chrome" }

   ]'

```



The `TEST_PARALLEL` flag indicates to not do in-test setup which would conflict

with other test processes. We also rely on setting `TEST_FUNC_PORT` specifically

to non-conflicting ports with at least 3 ports total from the starting number

for the two separate static servers we run during tests.



**Sauce Labs**



To run Sauce Labs tests in parallel from a local machine, you'll need the `sc`

binary, which can be force installed with:



```sh

$ SAUCE_CONNECT_DOWNLOAD_ON_INSTALL=true npm install sauce-connect-launcher

```



After this, the module is available at:

`node_modules/sauce-connect-launcher/sc/*/bin/sc`



From there, you can invoke our helper local commands:



```sh

$ TEST_PARALLEL=true \

  SAUCE_USERNAME= \

  SAUCE_ACCESS_KEY= \

  builder envs test-func-sauce \

  --setup=setup-sauce \

  --buffer \

  '[ { "TEST_FUNC_PORT": 3030, "ROWDY_SETTINGS":"sauceLabs.IE_8_Windows_2008_Desktop" },

     { "TEST_FUNC_PORT": 3040, "ROWDY_SETTINGS":"sauceLabs.IE_9_Windows_2008_Desktop" },

     { "TEST_FUNC_PORT": 3050, "ROWDY_SETTINGS":"sauceLabs.IE_10_Windows_2012_Desktop" }

   ]'

```



### Releases



**IMPORTANT - NPM**: To correctly run `preversion` your first step is to make

sure that you have a very modern `npm` binary:



```sh

$ npm install -g npm

```



First, you can optionally edit and commit the project history.



```sh

$ vim HISTORY.md

$ git add HISTORY.md

$ git commit -m "Update history for VERSION"

```



Now we're ready to publish. Choose a semantic update for the new version.

If you're unsure, read about semantic versioning at http://semver.org/



```sh

$ npm version VERSION|major|minor|patch -m "Version %s - INSERT_REASONS"

```



Now `postversion` will push to git and publish to NPM.



[trav_img]: https://api.travis-ci.org/walmartlabs/little-loader.svg

[trav_site]: https://travis-ci.org/walmartlabs/little-loader

[sauce]: https://saucelabs.com

[sauce_img]: http://badges.herokuapp.com/sauce/wml-little-loader



[sauce_site]: https://saucelabs.com/u/wml-little-loader

[cov]: https://coveralls.io

[cov_img]: https://img.shields.io/coveralls/walmartlabs/little-loader.svg

[cov_site]: https://coveralls.io/r/walmartlabs/little-loader