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DEVELOPMENT.md

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Remix Development

All Remix development happens here on GitHub. There are two main branches in this repository that you should be aware of:

  • main - This is the stable line. Code in this branch should always pass all the tests. Hot fixes may be pushed directly to this branch without appearing in dev. Docs on the website reflect this branch.
  • dev - This is where most development happens. When hot fix commits land in main they are merged into this branch. Feature branches are based on this branch and are merged in as they are completed.

We currently use yarn (version 1) to develop Remix. But don't get too attached to it. We'll be migrating to npm 7 soon.

Workflow

# install everything
yarn install

# run the build
yarn build

# run the tests
yarn test
# run the tests for a specific package
yarn test react
# run the tests in watch mode
yarn test react --watch

Releases

New releases should be created from release branches originating from the dev branch. When you are ready to begin the release process:

  • Make sure you've pulled all of the changes from GitHub for both dev and main branches.
  • Check out the dev branch.
  • Create a new release branch with the release- prefix (eg, git checkout -b release-next).
    • IMPORTANT: The release- prefix is important, as this is what triggers our GitHub CI workflow that will ultimately publish the release.
    • Branches named release-experimental will not trigger our release workflow, as experimental releases handled differently (outlined below).
  • Merge main into the release branch.

Changesets will do most of the heavy lifting for our releases. When changes are made to the codebase, an accompanying changeset file should be included to document the change. Those files will dictate how Changesets will version our packages and what shows up in the changelogs.

Starting a new pre-release

  • Ensure you are on the new release-* branch.
  • Enter Changesets pre-release mode using the pre tag: yarn changeset pre enter pre.
  • Commit the change and push the release-* branch to GitHub.
  • Wait for the release workflow to finish. The Changesets action in the workflow will open a PR that will increment all versions and generate the changelogs.
  • Review the updated CHANGELOG files and make any adjustments necessary, then merge the PR into the release-* branch.
    • find packages -name 'CHANGELOG.md' -mindepth 2 -maxdepth 2 -exec code {} \;
  • Once the PR is merged, the release workflow will publish the updated packages to npm.

Iterating a pre-release

You may need to make changes to a pre-release prior to publishing a final stable release. To do so:

  • Make whatever changes you need.
  • Create a new changeset: yarn changeset.
    • IMPORTANT: This is required even if you ultimately don't want to include these changes in the logs. Remember, changelogs can be edited prior to publishing, but the Changeset version script needs to see new changesets in order to create a new version.
  • Commit the changesets and push the the release-* branch to GitHub.
  • Wait for the release workflow to finish and the Changesets action to open its PR that will increment all versions.
  • Review the PR, make any adjustments necessary, and merge it into the release-* branch.
  • Once the PR is merged, the release workflow will publish the updated packages to npm.

Publishing the stable release

  • Exit Changesets pre-release mode: yarn changeset pre exit.
  • Commit the deleted pre-release file along with any unpublished changesets, and push the release-* branch to GitHub.
  • Wait for the release workflow to finish. The Changesets action in the workflow will open a PR that will increment all versions and generate the changelogs for the stable release.
  • Review the updated CHANGELOG files and make any adjustments necessary.
    • We should remove the changelogs for all pre-releases ahead of publishing the stable version.
    • [TODO: We should automate this]
  • Merge the PR into the release-* branch.
  • Once the PR is merged, the release workflow will publish the updated packages to npm.
  • Once the release is published:
    • merge the release-* branch into main and push it up to GitHub
    • merge the release-* branch into dev and push it up to GitHub
    • Convert the remix@1.x.y tag to a Release on Github with the name v1.x.y
    • Copy the relevant changelog entries from all packages into the Release Notes and adjust accordingly, matching the format used by prior releases

Experimental releases

Experimental releases do not need to be branched off of dev. Experimental releases can be branched from anywhere as they are not intended for general use.

  • Create a new branch for the release: git checkout -b release-experimental.
  • Make whatever changes you need and commit them: git add . && git commit "experimental changes!".
  • Update version numbers and create a release tag: yarn version:experimental.
  • Push to GitHub: git push origin --follow-tags.
  • Create a new release for the tag on GitHub to trigger the CI workflow that will publish the release to npm. Make sure you check the "prerelease" checkbox so it is not mistaken for a stable release.

Local Development Tips and Tricks

Environment Variables

This repository supports handful of environment variables to streamline the local development/testing process.

REMIX_DEBUG

By default, the Remix rollup build will strip any console.debug calls to avoid cluttering up the console during application usage. These console.debug statements can be preserved by setting REMIX_DEBUG=true during your local build.

REMIX_DEBUG=true yarn watch

REMIX_LOCAL_BUILD_DIRECTORY

When developing Remix locally, you often need to go beyond unit/integration tests and test your changes in a local Remix application. The easiest way to do this is to run your local Remix build and use this environment variable to direct rollup to write the output files directly into the local Remix application's node_modules folder. Then you just need to restart your local Remix application server to pick up the changes.

# Tab 1 - create and run a local remix application
npx create-remix
cd my-remix-app
npm run dev

# Tab 2 - remix repository
REMIX_LOCAL_BUILD_DIRECTORY=../my-remix-app yarn watch

Now - any time you make changes in the Remix repository, they will be written out to the appropriate locations in ../my-remix-app/node_modules and you can restart the npm run dev command to pick them up 🎉.

Transition Manager Flows

The transition manager is a complex and heavily async bit of logic that is foundational to Remix's ability to manage data loading, submission, error handling, and interruptions. Due to the user-driven nature of interruptions we don't quite believe it can be modeled as a finite state machine, however we have modeled some of the happy path flows below for clarity.

Transitions

Note: This does not depict error or interruption flows

graph LR
  %% <Link> transition
  idle -->|link clicked| loading/normalLoad
  idle -->|form method=get| submitting/loaderSubmission
  idle -->|form method=post| submitting/actionSubmission
  idle -->|fetcher action redirects| loading/fetchActionRedirect

  subgraph "&lt;Link&gt; transition"
  loading/normalLoad -->|loader redirected| loading/normalRedirect
  loading/normalRedirect --> loading/normalRedirect
  end
  loading/normalLoad -->|loaders completed| idle
  loading/normalRedirect -->|loaders completed| idle

  subgraph "&lt;Form method=get&gt;"
  submitting/loaderSubmission -->|loader redirected| loading/loaderSubmissionRedirect
  loading/loaderSubmissionRedirect --> loading/loaderSubmissionRedirect
  end
  submitting/loaderSubmission -->|loaders completed| idle
  loading/loaderSubmissionRedirect -->|loaders completed| idle

  subgraph "&lt;Form method=post&gt;"
  submitting/actionSubmission -->|action returned| loading/actionReload
  submitting/actionSubmission -->|action redirected| loading/actionRedirect
  loading/actionReload -->|loader redirected| loading/actionRedirect
  loading/actionRedirect --> loading/actionRedirect
  end
  loading/actionReload -->|loaders completed| idle
  loading/actionRedirect -->|loaders completed| idle

  subgraph "Fetcher action redirect"
  loading/fetchActionRedirect --> loading/fetchActionRedirect
  end
  loading/fetchActionRedirect -->|loaders completed| idle
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Fetchers

Note: This does not depict error or interruption flows, nor the ability to re-use fetchers once they've reached idle/done.

graph LR
  idle/init -->|"load"| loading/normalLoad
  idle/init -->|"submit (get)"| submitting/loaderSubmission
  idle/init -->|"submit (post)"| submitting/actionSubmission

  subgraph "Normal Fetch"
  loading/normalLoad -.->|loader redirected| T1{{transition}}
  end
  loading/normalLoad -->|loader completed| idle/done
  T1{{transition}} -.-> idle/done

  subgraph "Loader Submission"
  submitting/loaderSubmission -.->|"loader redirected"| T2{{transition}}
  end
  submitting/loaderSubmission -->|loader completed| idle/done
  T2{{transition}} -.-> idle/done

  subgraph "Action Submission"
  submitting/actionSubmission -->|action completed| loading/actionReload
  submitting/actionSubmission -->|action redirected| loading/actionRedirect
  loading/actionRedirect -.-> T3{{transition}}
  loading/actionReload -.-> |loaders redirected| T3{{transition}}
  end
  T3{{transition}} -.-> idle/done
  loading/actionReload --> |loaders completed| idle/done

  classDef transition fill:lightgreen;
  class T1,T2,T3 transition;
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