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openlayers/DEVELOPING.md

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# Developing
## Setting up development environment
You will start by
[forking](https://github.com/openlayers/openlayers/fork) the OpenLayers repository.
### Development dependencies
The minimum requirements are:
* Git
* [Node.js](https://nodejs.org/) (version 8 and above)
The executables `git` and `node` should be in your `PATH`.
To install the Node.js dependencies run
$ npm install
## Running examples
To run the examples you first need to start the dev server:
$ npm run serve-examples
Then, load <http://localhost:8080/> in your browser.
## Linking Package
The `ol` package is published from the `build/ol` folder of the `openlayers` repo.
After you've cloned the `openlayers` repo locally run the `npm build-package` to prepare the build then use the `npm link` command to connect it your project.
Below is an example of how to build and link it to "sample-project"
$ cd openlayers
$ npm run build-package
$ cd build/ol
$ npm link
$ cd /sample-project
$ npm link ol
To remove the link run the following commands
$ cd sample-project
$ npm unlink --no-save ol
$ cd ../openlayers
$ npm unlink
## Running tests
To run the tests once:
$ npm test
To run the tests continuously during development:
$ npm run karma
## Adding examples
Adding functionality often implies adding one or several examples. This
section provides explanations related to adding examples.
The examples are located in the `examples` directory. Adding a new example
implies creating two or three files in this directory, an `.html` file, a `.js`
file, and, optionally, a `.css` file.
You can use `simple.js` and `simple.html` as templates for new examples.