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Contributing to SWC
Thank you for your interest in contributing to SWC! Good places to start are:
- Reading this document
- Reading the high-level structure of SWC in ARCHITECTURE.md
- E-easy labeled issues on the issue tracker
Code of Conduct
All contributors are expected to follow our Code of Conduct.
Bug reports
We can't fix what we don't know about, so please report problems. This includes problems with understanding the documentation, unhelpful error messages, and unexpected behavior.
You can open a new issue by following this link and choosing one of the issue templates.
Feature requests
Please feel free to open an issue using the feature request template.
Working on issues
If you're looking for somewhere to start, check out the E-easy and E-mentor tags.
Feel free to ask for guidelines on how to tackle a problem on Discord or open a new issue. This is especially important if you want to add new features to SWC or make large changes to the already existing code-base. The SWC core developers will do their best to provide help.
If you start working on an already-filed issue, post a comment on this issue to let people know that somebody is working it. Feel free to ask for comments if you are unsure about the solution you would like to submit.
We use the "fork and pull" model [described here][development-models], where contributors push changes to their personal fork and create pull requests to bring those changes into the source repository. This process is partly automated: Pull requests are made against SWC's repository, tested and reviewed. Once a change is approved to be merged, a friendly bot merges the changes into an internal branch, runs the full test-suite on that branch and only then merges into main. This ensures that SWC passes the test-suite at all times.
Steps to get started:
- Fork SWC and create a branch from main for the issue you are working on.
- Make sure you have the
make
utility installed, along with Rust and C/C++ compilers. - Please adhere to the code style that you see around the location you are working on.
- [Commit as you go][githelp].
- Include tests that cover all non-trivial code. The existing tests
in
test/
provide templates on how to test SWC's behavior in a sandbox-environment. The internal cratetesting
provides a vast amount of helpers to minimize boilerplate. Seetesting/lib.rs
for an introduction to writing tests. - Run
cargo test
and make sure that it passes. - All code changes are expected to comply with the formatting suggested by
rustfmt
. You can userustup component add --toolchain nightly rustfmt-preview
to installrustfmt
and userustfmt +nightly --unstable-features --skip-children
on the changed files to automatically format your code. - Push your commits to GitHub and create a pull request against the
swc-project/swc
main
branch.
Getting your development environment set up
After cloning the project there are a few steps required to get the project running.
-
Fetch submodules to pull ECMAScript test suites.
git submodule update --init --recursive
-
Install js dependencies.
yarn ( cd ecmascript/transforms; yarn )
-
Setup some environment variables which is required for tests.
export RUST_BACKTRACE=full export PATH="$PATH:$PWD/ecmascript/transforms/node_modules/.bin" export RUST_MIN_STACK=16777216
-
Install deno, if you are going to work on the bundler.
See official install guide of deno to install it.
-
Ensure you're using Node.JS >= 16
Since tests make use of
atob
which was only introduced in node 16. -
Run tests
cargo test --all --all-features
Pull requests
After the pull request is made, one of the SWC project developers will review your code. The review-process will make sure that the proposed changes are sound. Please give the assigned reviewer sufficient time, especially during weekends. If you don't get a reply, you may ping the core developers on Discord.
A merge of SWC's main-branch and your changes is immediately queued to be tested after the pull request is made. In case unforeseen problems are discovered during this step (e.g. a failure on a platform you originally did not develop on), you may ask for guidance. Push additional commits to your branch to tackle these problems.
The reviewer might point out changes deemed necessary. Please add them as extra commits; this ensures that the reviewer can see what has changed since the code was previously reviewed. Large or tricky changes may require several passes of review and changes.
Once the reviewer approves your pull request, a friendly bot picks it up
and merges it into the SWC main
branch.
Contributing to the documentation
The SWC documentation can be found at swc-project/website
.
At the bottom of each page on swc.rs there is a Edit this page on GitHub
button that immediately links to the right page to edit.
Issue Triage
Sometimes an issue will stay open, even though the bug has been fixed. And sometimes, the original bug may go stale because something has changed in the meantime.
It can be helpful to go through older bug reports and make sure that they are still valid. Load up an older issue, double check that it's still true, and leave a comment letting us know if it is or is not. The [least recently updated sort][lru] is good for finding issues like this.
Contributors with sufficient permissions on the SWC repository can help by adding labels to triage issues:
-
Yellow, A-prefixed labels state which area of the project an issue relates to.
-
Magenta, B-prefixed labels identify bugs which are blockers.
-
Red, C-prefixed labels represent the category of an issue. In particular, C-feature-request marks proposals for new features. If an issue is C-feature-request, but is not Feature accepted, then it was not thoroughly discussed, and might need some additional design or perhaps should be implemented as an external subcommand first. Ping
@swc-project/swc
if you want to send a PR for an such issue. -
Green, E-prefixed labels explain the level of experience or effort necessary to fix the issue. E-mentor issues also have some instructions on how to get started.
-
Purple gray, O-prefixed labels are the operating system or platform that this issue is specific to.
-
Orange, P-prefixed labels indicate a bug's priority.
-
Light orange, L-prefixed labels indicate language related to the bug.