North Pole Merriment


    0.11.0 • Public • Published

    This package contains many useful utilities to work with JavaScript monorepo.

    This package is opinionated in many ways and it expects similar monorepo setup to Universe. This monorepo is not just several projects next to each other. It shares common executors for Flow, Eslint and Tests. This means that individual projects do not have their own scripts for running these tools (can change in the future). It also relies on Yarn Workspaces and git.


    yarn add --dev @adeira/monorepo-utils


    findRootPackageJson, findRootPackageJsonPath

    It finds the root package.json file in the monorepo (must contain Yarn Workspaces). It is useful if you need to know where is the root or you need to access root package.json because of workspaces definition for example.

    const rootPackageJSON = findRootPackageJson();

    It memoizes the result internally so when you call it for the second time you'll get the result instantly. Function findRootPackageJson returns the file content (object) but function findRootPackageJsonPath returns only the path.

    Working with Workspaces

    Workspaces utility allows you to access information about workspaces anywhere in the monorepo. You can for example iterate all workspaces:

    import { Workspaces } from '@adeira/monorepo-utils';
    Workspaces.iterateWorkspaces((packageJSONLocation) => {
      test(packageJSONLocation, () => {
        const packageJson = require(packageJSONLocation);

    There is also (a)synchronous version without callbacks:

    import { Workspaces } from '@adeira/monorepo-utils';
    const packageJSONLocations = Workspaces.getWorkspacesSync(); // OR: getWorkspacesAsync
    // [ '/absolute/path/src/packages/js/package.json',
    //   '/absolute/path/src/packages/monorepo/package.json' ]


    This function will give you all the workspaces that has been touched by your latest chages. Directly changed an also those workspaces who depend on the changed workspaces

    import { getTouchedWorkspaces } from '@adeira/monorepo-utils';
    const workspaces = getTouchedWorkspaces();
    console.log(Array.from(workspaces)); // -> ['@kiwicom/workspace1', '@kiwicom/workspace2']

    Working with changes (Git)

    import { Git } from '@adeira/monorepo-utils';
    // All files with committed changes on current branch in comparison to origin/master
    // Files with changes staged for the next commit (via "git add")
    // Example usage: custom pre-commit hook
    // BOTH changed files staged for commit and not staged files changed since last commit
    // All changed or not tracked files OR changes in last commit if current branch is origin/master
    // Example usage: CI script to validate changed files
    // and more ...

    Read carefully! We assume that default branch is origin/master as it's common convention in Git. This is important to know because it may behave unpredictably, e.g. when you call Git.getChangesToTest() and your default branch is not master and/or your remote repository is not named origin. This is currently not configurable.


    Besides usual methods on Git, there is also utility function getChangedFiles. How does that differ from Git.getChangedFiles? getChangedFiles fails if CI environment is detected and there are any uncommitted changes. So in most cases you should rather prefer this to fail CI pipeline when some files are accidentally touched or created.


    Glob is our wrapper around Node.js glob library which adds additional default configuration (ignores node_modules by default), correct Flow types and validation of invalid usages. The API is very similar to the original Glob:

    import { globSync } from '@adeira/monorepo-utils';
    const filenames = globSync('/**/*.js', {
      root: path.join(__dirname, 'fixtures'),
    // ...

    Alternatively, you can use the async variant:

    import { globAsync } from '@adeira/monorepo-utils';
    (async function () {
      const filenames = await globAsync('/**/*.js', {
        root: path.join(__dirname, 'fixtures'),
      // ...

    Option root is required when your pattern starts from the root /. You don't have to worry about it too much - this glob will tell you when you use it wrong. Please note: do not use path to construct glob patterns!

    Working with shell commands (ShellCommand)

    Shell command utility gives you the ability to work with shell while using friendly API and Flow types. Moreover it throws exceptions when the underlying child process fails for whatever reason so you can react easily. Basic usage:

    import { ShellCommand } from '@adeira/monorepo-utils';
    new ShellCommand(
      null, // optional current working directory (defaults to `process.cwd`)

    You can optionally set additional command properties:

    new ShellCommand(null, 'git', 'am')
      .setOutputToScreen() // prints on screen instead of returning the value
      .setStdin('input value')
      .setNoExceptions() // hides all errors - potentially dangerous!

    This command currently supports only synchronous execution and therefore it's recommended to use it only for simple scripts and tools (not for production traffic). Please note that many system commands technically support parallel execution but there can be some hidden limitations. For example Git uses single file .git/index.lock for locks and you may run into issues when executing some operations in parallel:

    Another git process seems to be running in this repository, e.g.
    an editor opened by 'git commit'. Please make sure all processes
    are terminated then try again.

    Binary monorepo-run-tests

    This binary script is our tests executor for monorepo environments. It tries to find relevant changes to test based on Git history and Yarn Workspaces. It currently expects .jest.config.js in the project root. Usage (package.json):

      "scripts": {
        "test": "monorepo-run-tests"

    And just run it as usual (yarn run test). You should see something like this:

    $ universe [master] yarn run test
    yarn run v1.13.0
    $ monorepo-run-tests
    DIRTY WORKSPACES:  Set { '_components' }
    PATHS TO TEST:  Set { 'src/components', 'src/apps', 'src/relay', 'src/translations' }
     PASS  src/components/stylesheet/__tests__/PlatformStyleSheet-test.js
     PASS  src/translations/__tests__/Translation-test.js
     PASS  src/components/__tests__/Price-test.js (5.494s)
    Test Suites: 10 passed, 10 total
    Tests:       25 passed, 25 total
    Snapshots:   20 passed, 20 total
    Time:        6.582s, estimated 12s
    Ran all test suites matching /src\/components|src\/apps|src\/relay|src\/translations|src\/components\/Icon.js/i.
    ✨  Done in 7.99s.

    As you can see it detected some changes in _components workspace and it tries to resolve any other affected workspace (seems like for example src/relay is using _components workspace so it must be tested as well). It can happen that there are no changes to run.

    It is possible to enforce one specific timezone with TZ environment variable:

    TZ=Africa/Addis_Ababa monorepo-run-tests

    If you specifically want to test all files you can run yarn run monorepo-run-tests --all. The test runner will also run all tests when it detects changes to .jest.config.js, or any files specified at setupFiles and setupFilesAfterEnv. Note that it will only look for changes at the root level and not setup files registered under projects.setupFilesAfterEnv.

    Binary monorepo-babel-node

    Do not use this in production! (more details)

    This binary allows you to run scripts just like with babel-node except it takes into account correct Babel configuration (upward mode by default) and it doesn't ignore our own Yarn Workspace dependencies while transpiling (node_modules/@adeira/*). Usage (package.json):

      "scripts": {
        "test-bc": "monorepo-babel-node ./scripts/test-bc.js"

    Where scripts/test-bc.js is normal JS file with all the modern JS features.

    It takes into account all allowed Node.js environment flags which means you can for example debug your scripts with --inspect and --inspect-brk. Rest of the flags are forwarded to the executed script.




    npm i @adeira/monorepo-utils

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    • martin.zlamal
    • adeira-npm-bot