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CONTRIBUTING.md

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How to Contribute

Great to see you! Help us out by filing bugs or feature requests, assisting others in our forums or by contributing improvements.

Table of Contents

Working with Issues

We use our issue tracker for project communication, discussion and planning.

Creating an Issue

Help others to understand your request:

Reporting a Bug

Help us to understand and reproduce your issue:

  • Attach your environment (browser, bpmn-js version)
  • Attach steps to reproduce
  • Attach code samples, configuration options or stack traces that provide the necessary context

If possible, try to build an example that reproduces your problem. You can use our playgrounds for viewer or modeler as a starting point or put a demo up on GitHub for inspection.

Suggesting a Feature

  • Provide the necessary context that allows us to understand how your proposal improves our library

Helping out

  • Share your perspective on issues
  • Be helpful and respect others when commenting

Contributing Improvements

Learn how to setup the project locally, make changes and contribute bug fixes and new features through pull requests.

Setting up the Project

The project development runs on top of the diagram-js master branch. The following code snippet sets up both libraries linking diagram-js to bpmn-js.

mkdir bpmn.io
cd bpmn.io

git clone [email protected]:bpmn-io/diagram-js.git
(cd diagram-js && npm i)

git clone [email protected]:bpmn-io/bpmn-js.git
(cd bpmn-js && npm install && npm link ../diagram-js)

// Run the test suite
npm test

// Running the test suite with every file change
TEST_BROWSERS=(Chrome|Firefox|IE) npm run dev

For details consult our in depth setup guide.

Discussing Code Changes

Create a pull request if you would like to have an in-depth discussion about some piece of code.

Code Style

In addition to our automatically enforced lint rules, please adhere to the following conventions:

  • Use modules (import / export (default))
  • Do NOT use ES language constructs (class, const, ...) in sources

Rationale: People should be able to consume parts of the library with an ES module aware bundler such as Webpack or Rollup without the need to use a transpiler such as Babel.

Creating a Pull Request

We use pull requests for feature additions and bug fixes. If you are not yet familiar on how to create a pull request, read this great guide.

Some things that make it easier for us to accept your pull requests

  • The code adheres to our conventions
    • spaces instead of tabs
    • single-quotes
    • ...
  • The code is tested
  • The npm run all build passes (executes tests + linting)
  • The work is combined into a single commit
  • The commit messages adhere to our guideline

We'd be glad to assist you if you do not get these things right in the first place.

❤️ from the bpmn.io team.