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Contributing

Getting Started

You'll need node ^20 and npm ^10 installed on your machine to work with the repository locally. After your environment is ready, navigate to the repository and run npm run bootstrap, this will install dependencies and will compile all packages.

After bootstrap is finished, you should be able to run npm run start and see Compass application running locally. Alternatively you can start a web version of the app by running npm run start-web.

Compass uses a monorepo is powered by npm workspaces and lerna, although not necessary, it might be helpful to have a high level understanding of those tools.

Submitting a Change

MongoDB welcomes community contributions! If you’re interested in making a contribution to MongoDB Compass, please follow the steps below before you start writing any code:

  1. Sign the contributor's agreement. This will allow us to review and accept contributions.
  2. Fork the repository on GitHub
  3. Create a branch with a name that briefly describes your feature
  4. Implement your feature or bug fix
  5. Add new cases to the relevant ./<package>/tests folder that verify your bug fix or make sure no one unintentionally breaks your feature in the future and run them with npm test
  6. Add comments around your new code that explain what's happening
  7. Commit and push your changes to your branch then submit a pull request

Bugs

You can report new bugs by creating a new issue. Please include as much information as possible about your environment.

VSCode Setup

This repository includes a few recommended plugins for your convenience:

  • Prettier extension helps to format your code following this repository code style.

    ⚠️  If you install the Prettier VSCode extension please make sure to set the prettier.requireConfig option for the workspace! This will ensure only packages that have prettier enabled will get formatted.

  • ESLint extension highlights possible issues in your code following our common eslint configuration.
  • ANTLR4 grammar support extension helps to work with the bson-transpilers package that is implemented with the help of antlr (.g and .g4 files).

Enabling Chrome DevTools

To enable the Chrome DevTools for the Electron renderer processes, click "Settings" under "MongoDB Compass Dev Local" in the top menu (or press ⌘ + ,) and click "Enable DevTools" followed by "Save", which will enable a "Toggle DevTools" item in the "View" top menu. Click this to toggle the DevTools panel (or press ⌥ + ⌘ + I).

Working on Plugins

Note

For documentation regarding how to write plugin packages, check out the hadron-app-registry documentation.

To run npm scripts inside specific workspaces in the monorepo you can use either lerna --scope or npm --workspace command line arguments. As an example, to run all tests in one plugin that you are working on such as the compass-aggregations plugin, you can run npm run test --workspace packages/compass-aggregation or lerna run test --scope @mongodb-js/compass-aggregations commands

When running the application locally and changing any code in the monorepo, webpack will take care of automatically rebuilding the modules. In some cases, like changing styles or React component code, webpack might be able to hot-reload the code, but in most cases a page refresh is required to see the changes.

In addition to running lerna commands directly, there are a few convenient npm scripts for working with packages:

  • npm run compile-changed will compile all plugins and their dependants changed since origin/HEAD
  • npm run test-changed will run tests in all packages and their dependants changed since origin/HEAD.
  • npm run check-changed will run eslint and depcheck validation in all packages (ignoring dependants) changed since origin/HEAD

Building Compass Locally

To build compass you can run package-compass script:

HADRON_DISTRIBUTION='compass' npm run package-compass

It is required to provide HADRON_DISTRIBUTION env variable explicitly. You can change the type of distribution you are building by setting a different HADRON_DISTRIBUTION value:

HADRON_DISTRIBUTION='compass-readonly' npm run package-compass

Available options are:

  • compass (default): Your usual Compass build with all functionality available
  • compass-readonly: Build that doesn't allow any modifications for server data
  • compass-isolated: Doesn't establish any connections except for the database

Build process can take a while and a bit quiet by default. You can use DEBUG env variable to make it more verbose:

DEBUG=hadron* npm run package-compass

To speed up the process you might want to disable creating installer for the application. To do that you can set HADRON_SKIP_INSTALLER environmental variable to true when running the script

HADRON_SKIP_INSTALLER=true npm run package-compass

Publishing Packages

Compass is built out of a number of different NPM packages. Since all the relevant code is bundled in the packaged version of Compass with webpack, it is not necessary to publish any package to build and run the Compass application.

Some of the packages, however, are used externally by other MongoDB products and by the javascript community. These packages are published through CI workflows.

In particular each change to the main branch is analyzed to calculate a new version based on changes since the last time it was published. A pr with the new versions of each changed package is opened and updated on each new change.

Merging that PR will trigger another CI job that will publish to NPM any package which version is not yet present on the registry.

The version of packages is calculated following conventional bumps: See https://github.com/mongodb-js/devtools-shared/tree/main/packages/bump-monorepo-packages for details.

Add / Update / Remove Dependencies in Packages

To add, remove, or update a dependency in any workspace you can use the usual npm install with a --workspace argument added, e.g. to add react-aria dependency to compass-aggregations and compass-query-bar plugins you can run npm install --save react-aria --workspace @mongodb-js/compass-aggregations --workspace @mongodb-js/compass-query-bar.

Additionally if you want to update a version of an existing dependency, but don't want to figure out the scope manually, you can use npm run where helper script. To update webpack in every package that has it as a dev dependency you can run npm run where "devDependencies['webpack']" -- install --save-dev webpack@latest

Creating a New Workspace / Package

To create a new package please use the create-workspace npm script:

npm run create-workspace [workspace name]

This will do all the initial workspace bootstrapping for you, ensuring that your package has all the standard configs set up and ready, and all the npm scripts aligned with other packages in the monorepo, which is important to get the most out of all the provided helpers in this repository (like npm run check-changed commands or to make sure that your tests will not immediately fail in CI because of the test timeout being too small)

Caveats

hdiutil: couldn't unmount "diskn" - Resource busy or Similar hdiutil Errors

Sometimes when trying to package compass on macOS you can run into the said error. There doesn't seems to be any common solution to it and the reasons are probably related to the outdated versions of some electron packages we are currently using (but will eventually update). If you are running into that issue, you can disable creating an installer during the packaging process by setting HADRON_SKIP_INSTALLER env variable to true:

HADRON_SKIP_INSTALLER=true npm run test-package-compass

Module did not self-register or Module '<path>' was compiled against a different Node.js version Errors

When running Compass application or tests suites locally, you might run into errors like the following:

Error: Module did not self-register: '/path/to/native/module.node'.

Error: The module '/path/to/native/module.node' was compiled against a different Node.js version using NODE_MODULE_VERSION $XYZ. This version of Node.js requires NODE_MODULE_VERSION $ABC.

The root cause is native modules compiled for a different version of the runtime (either Node.js or Electron) that tries to import the module. In our case this is usually caused by combination of two things:

  1. Modules have to be recompiled for the runtime they will be used in
  2. Due to npm workspaces hoisting all shared dependencies to the very root of the monorepo, all packages use the same modules imported from the same location

This means that if you e.g., start Compass application locally it will recompile all native modules to work in Electron runtime, if you would try to run tests for @mongodb-js/connection-storage library right after that, tests would fail due to keytar library not being compatible with Node.js environment that the tests are running in.

If you run into this issue, make sure that native modules are rebuilt for whatever runtime you are planning to use at the moment. To help with that we provide two npm scripts: npm run electron-rebuild will recompile native modules to work with Electron and npm run node-rebuild will recompile them to work with Node.js.

The React Developer Tools extension is not working?

To inspect the React component hierarchies in the Chrome DevTools panel, use the React Developer Tools, which is already installed when running a local development build. For a reason, yet to be determined, you must reload (⌘ + R) the DevTools window to see the "⚛️ Components" and "⚛️ Profiler" tabs.