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dygraphs developer notes

So you've made a change to dygraphs and would like to contribute it back to the open source project. Wonderful!

This is a step-by-step guide explaining how to do it.


To install dependencies, run

npm install

To build dygraphs, run

npm run build

To run the tests, run:

npm run build-tests
npm run test

To iterate on the code, run:

npm run watch

and open tests/demo.html (or one of the other demos) in your browser.

To iterate on a unit test, run the watch command above and open


in your browser. You can use the Mocha UI to run just a single test or suite. Or you can change it to it.only to do run just one test in code.

To run a single test from the command line, you can use:

npm run test -- --grep highlight-series-background

(Note the extra --.)

dygraphs style

When making a change, please try to follow the style of the existing dygraphs code. This will make the review process go much more smoothly.

A few salient points:

  1. We try to adhere to Google's JS style guide and would appreciate it if you try to as well. This means:
    • No tabs! Indent using two spaces.
    • Use camelCase for variable and function names.
    • Limit lines to 80 characters.
  2. If you've added a new feature, add a test for it (in the tests/ directory) or a gallery entry.
  3. If you've added an option, document it in dygraph-options-reference.js. You'll get lots of warnings if you don't.
  4. If you've fixed a bug or added a feature, add a unit test (in auto_tests) for it.

Adding a unit test ensures that we won't inadvertently break your feature in the future. To do this, either add to an existing test in auto_tests/tests or create a new one.

Sending a Pull Request

To make a change, you'll need to send a Pull Request. See GitHub's documentation here.