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Contributing to Auspice development

Thank you for helping us to improve Nextstrain!

To get started, please see the contributing guide for useful information about how to pick an issue, submit your contributions, and so on.

This project strictly adheres to the Contributor Covenant Code of Conduct.

Please see the project boards for currently available issues.

Contributing code

Code contributions are welcomed! Please see the main auspice docs for details on how to install and run auspice from source.

Please comment on an open issue if you are working on it. For changes unrelated to an open issue, please make an issue outlining what you would like to change/add.

Where possible, please rebase your work onto master rather than merging changes from master into your PR.

From a fork: git pull --rebase upstream master

Make sure tests are passing

We use the following libraries for all kinds of testing, so it'd help to read the docs to get familiar with their APIs and features:

  1. Jest
  2. Puppeteer
  3. Jest-Puppeteer
  4. Jest-Image-Snapshot

When you submit a pull request to the auspice repository, a variety of integration and unit tests will need to pass before it can be merged.

You will likely want to run these tests locally before submitting:

First, install the dependencies with npm i, then:

For unit tests

Run npm test.

For linting

Run npm run lint. If there are issues run npm run lint:fix.

For integration tests

For integration tests to work, you'll need to have git-lfs installed (see below) as it stores the images that the snapshot tests will use.

  1. Fetch the datasets with npm run get-data and npm run get-narratives.
  2. Ensure you are not currently running the site locally, then run npm run integration-test:ci.

How to update test snapshots

  1. Unit tests: npm run test -- -u
  2. Integration tests npm run integration-test -- -u

For smoke tests

  1. Fetch the datasets with npm run get-data and npm run get-narratives.
  2. Ensure you are not currently running the site locally, then run npm run smoke-test:ci.

Test Tips

  1. Run a single describe(), it(), or test() within a file, add .only():

    E.g., describe.only(), it.only(), or test.only()

  2. Run a single test file, append the following to your test command -- relative_or_absolute_path/to/file:

    E.g., npm run integration-test -- test/integration/zika.test.js

  3. Run integration tests in headful mode, prepend HEADLESS=false to your command:

    E.g., HEADLESS=false npm run integration-test

  4. For integration tests, please try to use expect-puppeteer as much as possible, and only resort to puppeteer's native API when we can't do it with expect-puppeteer. The reason is because expect-puppeteer has better DX, as explained here

  5. How to add a new integration image test:

    1. Wrap your image test with helper function toMatchImageSnapshot() from test/integration/helpers.js, and it will take a screenshot every 100ms until it matches the expected snapshot or timeout (default: 10s)

    2. Temporarily add page.waitFor(__ENOUGH__MS__) before taking the new snapshot to give the browser enough time to render a complete image

    3. Example: test/integration/zika.test.js


We use Git Large File Storage to manage certain assets. Currently these are limited to images within the ./test directory (which we use for snapshot integration testing) but this may change in the future. If you are not using these images, you don't need to have git-lfs installed; however will not be able to run integration tests without it. See here for installation instructions.

Helpful commands:

git lfs status
git lfs ls-files # list LFS tracked tiles

Contributing to Documentation

Nextstrain documentation is available at

This documentation is built from files contained within the Auspice GitHub repo -- see the docs-src/README within the docs-src directory for more details and instructions on how to contribute.

Note that currently the documentation must be rebuilt & pushed to GitHub after a new version is released in order for the changelog to correctly appear at

Contributing to Internationalization and Localization (i18n/l18n)

If you can assist in efforts to translate the Auspice interface to more languages your assistance would be very much appreciated. The currently available languages are displayed via a drop-down at the bottom of the sidebar.

Adding a new language

  1. Add the language to the getlanguageOptions function in this file
  2. If this is a new language, copy the folder (and the JSONs within it) src/locales/en and name it to match the language code for the new translation -- e.g. for Spanish this would be src/locales/es
  3. For each key-value in the JSONs, translate the english phrase to the new locale. (Do not modify the strings within {{...}} sections.)

For example, a spanish translation would change the English:

  "sampled between {{from}} and {{to}}": "sampled between {{from}} and {{to}}",
  "and comprising": "and comprising",


  "sampled between {{from}} and {{to}}": "aislados entre {{from}} y {{to}}",
  "and comprising": "y compuesto de",

Helper script to check what parts of a translation are out-of-date or missing

Run npm run diff-lang -- X, where X is the language you wish to check, for instance es. This will display the strings which:

  • need to be added to the translation
  • are present but should be removed as they are no longer used
  • are present but are simply a copy of the English version & need to be translated

Running npm run diff-lang will check all available languages.

Improving an existing translation

If a translation of a particular string is not yet available, then auspice will fall-back to the english version.

  1. Find the relevant key in the (EN) JSONs in this directory
  2. Add the key to the JSON with the same name, but in the directory corresponding to the language you are translating into (see above for an example).

Releases & versioning

New versions are released via the ./ script from an up-to-date master branch. It will prompt you for the version number increase, push changes to the release branch and, as long as Travis-CI is successful then a new version will be automatically published to npm.