Developing Kepler.gl

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Table of contents
​Development Setup​
​Running Tests​
​Coding Rules​
​Commit Message Guidelines​
​Writing Documentation​
​Developing kepler.gl Website​
​Publish the website​
​Publish a new version​
Development Setup
This document describes how to set up your development environment to build and test Kepler.gl, and explains the basic mechanics of using git, node, yarn.
Installing Dependencies
Before you can build Kepler.gl, you must install and configure the following dependencies on your machine:
​Git: The Github Guide to Installing Git is a good source of information.
​Node.js ^6.x: We use Node to generate the documentation, run a development web server, run tests, and generate distributable files. Depending on your system, you can install Node either from source or as a pre-packaged bundle.
We recommend using nvm (or nvm-windows) to manage and install Node.js, which makes it easy to change the version of Node.js per project.
​Yarn: We use Yarn to install our Node.js module dependencies (rather than using npm). See the detailed installation instructions.
Fork Kepler.gl Repo
If you plan to contribute code to kepler.gl, you must have a GitHub account so you can push code and open Pull Requests in the GitHub Repository. You must fork the main kepler.gl repository to create a Pull Request.
Developing kepler.gl
To develop features, debug code, run tests, we use webpack to start a local web server and serve the kepler.gl demo app from the src directory.
# Clone your kepler.gl fork repository:
git clone [email protected]:<github username>/kepler.gl.git
​
# Go to the kepler.gl directory:
cd kepler.gl
​
# Add the main kepler.gl repository as an upstream remote to your repository:
git remote add upstream "[email protected]:keplergl/kepler.gl.git"
​
# Install JavaScript dependencies:
yarn
​
# Setup mapbox access token locally
export MapboxAccessToken=<insert_your_token>
​
# Start the kepler.gl demo app
npm start
An demo app will be served at
http://localhost:8080/
This is the demo app we hosted on http://kepler.gl/#/demo. By default, it serves non-minified source code inside the src directory.
Develop with deck.gl
When develop, upgrade, debug deck.gl, Demo app can load deck.gl directly from src
// load deck.gl from node_modules/deck.gl/src, sub-modules from node_modules/@deck.gl/<module>/src
npm run start:deck
​
// load deck.gl src from the deck.gl folder parallel to kepler.gl
npm run start:deck-src
Running Tests
We write node and browser tests with Tape, Enzyme, jsDom and @probe.gl/test-util, and lint with ESLint. Make sure to run test before submitting your PR. To run all of the tests once
yarn test
Yarn test runs lint and 3 tests in different env. To run them separately
# lint
yarn lint
​
# node tests
yarn test-node
​
# jsdom tests
yarn test-browser
​
# headless browser tests, uses probe.gl to run browser tests with puppeteer
yarn test-headless
Here are some handy scripts / tricks for debugging tests
1.add .only to errored tests to only run 1 test at a time
test.only('MapContainerFactory', t => {
  // tests 
}
1.run all tests in chromium browser. This runs node, browser and headless browser tests in chromium browser and logs the output, you can step through the code with chrome developer tools
yarn test-browser-drive
1.Fast tests, runs node and browser tests without tap-spec output
yarn test-fast
To generate a coverage report
yarn cover
Coding Rules
To ensure consistency throughout the source code, keep these rules in mind as you are working:
All features or bug fixes must be tested by one or more [specs][unit-testing].
All public API methods must be documented with using jsdoc. To see how we document our APIs, please check out the existing source code and see the section about writing documentation​
This project use Eslint together Prettier. The linter should automatically inform you if you break any rules (like incorrect indenting, line breaking or if you forget a semicolon). Before doing a pull request, make sure to run the linter.
# To run the linter
yarn lint
Git Commit Guidelines
To commit your changes, please follow our rules over how our git commit messages can be formatted. This leads to more readable and unified messages that are easy to follow. But also, we use the git commit messages to generate the kepler.gl change log.
Commit Message Format
Each commit message consists of a header and a body. The header has a special format that includes a type and a subject. The PR # will be auto-generated once the PR is merged.
[<type>]<subject>(<pr>)
<BLANK LINE>
<body>
​
#e.g.
[Enhancement] Upgrade type-analyzer to pass 0/1 as integer (#317)
​
* Upgrade to [email protected]
* Add test
The header is mandatory and the scope of the header is optional.
Any line of the commit message cannot be longer 100 characters! This allows the message to be easier to read on GitHub as well as in various git tools.
Revert
If the commit reverts a previous commit, it should begin with revert: , followed by the header of the reverted commit. In the body it should say: This reverts commit <hash>., where the hash is the SHA of the commit being reverted. A commit with this format is automatically created by the git revert command.
Type
Must be one of the following, capitalized.
[Feat]: A new feature
[Enhancement]: An update of a existing feature
[Bug]: A bug fix
[Docs]: Documentation only changes
[Style]: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, typos, etc)
[Refactor]: A code change that neither fixes a bug nor adds a feature
[Perf]: A code change that improves performance
[Test]: Adding missing or correcting existing tests
[Chore]: Changes to the build process or auxiliary tools and libraries such as documentation generation
Subject
The subject contains succinct description of the change:
use the imperative, present tense: "change" not "changed" nor "changes"
don't capitalize first letter
no dot (.) at the end
Body
Just as in the subject, use the imperative, present tense: "change" not "changed" nor "changes". The body should include the motivation for the change and contrast this with previous behavior.
Breaking Changes should start with the word BREAKING CHANGE: with a space or two newlines. The rest of the commit message is then used for this.
Writing Documentation (THIS PART IS NOT AVAILABLE YET)
The Kepler.gl project uses jsdoc​
This means that all the docs are stored inline in the source code and so are kept in sync as it changes.
There is also extra content (the developer guide, error pages, the tutorial, and misceallenous pages) that live inside the Kepler.gl repository as markdown files.
This means that since we generate the documentation from the source code, we can easily provide version-specific documentation by simply checking out a version of Kepler.gl and running the build.
Building and viewing the docs locally
We build Api docs from scratch using documentation.js. It generates docs from jsdoc:
yarn docs
Writing jsdoc
You can find JSDoc instructions here. Documentation.js is interested in the following block tags:
@param {type} name description - describes a parameter of a function
@returns {type} description - describes what a function returns
@property - describes a property of an object
@description - used to provide a description of a component in markdown
@example - specifies an example.
@public - Only methods with @public tag will be included in the docs
The type in @param and @returns must be wrapped in {} curly braces, e.g. {Object|Array}. Parameters can be made optional by either appending a = to the type, e.g. {Object=}, or by putting the [name] in square brackets. Default values are only possible with the second syntax by appending =<value> to the parameter name, e.g. @param {boolean} [ownPropsOnly=false].
Develop The kepler.gl Website
Make sure to export mapbox token in the same terminal before start the server.
$ export MapboxAccessToken=<insert_your_token>
In order to start
$ yarn web
To checkout the build
$ cd website && yarn build
Publish the website
​Netlify is used to support kepler.gl demo website.
Netlify is connected to the following github triggers:
Create a new PR
Updated an existing PR
Merge PR onto master
A new production version of kepler.gl website is automatically created and deployed every time a PR is merged onto master.
In order to support testing environment, Netlify is setup to generate build every time a PR is created or updated. By generating builds for new and updated PRs we support CI/CD so developers can test their own build in a production like environment
Publish kepler.gl package to NPM
Requirements
To prepare a new release you need the following tool:
​gh-release: this tool facilitates the creation of a new git tag (using package.json version number) and a github release (different from npm release)
Setup gh-release with your github api token (instructions)
Push a new release
In order to publish a new version of kepler.gl a developer must perform the following steps:
1.Update package.json file with the new version value. Run npm version major | minor | patch to update version accordingly.
2.Update CHANGELOG.md with the latest commit changes. Print commits with git log --pretty=oneline --abbrev-commit
3.Create a new PR for review.
4.Once the PR is reviewed and merged, pull the latest changes locally.
5.Run gh-release: this command will create a new Github Release with the new updated CHANGELOG.md section.
6.Once the new Github Release is created, Github will automatically trgger a new Github Action flow that will automatically build and publish the new package version to NPM registry.
After Release is completed and pushed
Update each of the example folder package.json kepler.gl dependency with the newer. To update all examples, run
npm run example-version
This step is required after the new version is published otherwise it would fail.
Gitbook documentation
Kepler.gl documentation is hosted on gitbook. For more information read here​
Documentation structure
The documentation layout is defined by SUMMARY.md file where the table of contents define each entry has the following structure
* [ENTRY_LABEL](FILE_PATH)
e.g.
* [Welcome](README.md)
The above file is used by Gitbook to generate the doc navigation visible on the left-hand side of Kepler.gl doc website. Gitbook also has the ability to show description for each folder/section of the documentation by creating an entry in SUMMARY.md and create a new README.md file within said folder. The README.md file is a Gitbook convention that treats README files as if they were the main entry file for each folder.
The following is an example of doc section in SUMMARY.md file:
* [User guides](docs/user-guides/README.md)
Update Documentation
The integration with Gitbook allows to update the documentation in two different ways:
Update doc files in the Kepler.gl repo. Follow the PR flow like any other changes
Update documentation directly on Gitbook.
For both scenarios, changes will be propagated from one system to the other and vice versa. When updating Gitbook, a new git commit will be push to the Kepler.gl master branch.
Contributing
Contributor Covenant Code of Conduct
Last modified 24d ago