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# Contributing to SWC
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Thank you for your interest in contributing to SWC! Good places to start are:
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- Reading this document
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- Reading the high-level structure of SWC in [ARCHITECTURE.md](ARCHITECTURE.md)
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- [E-easy][e-easy] labeled issues on the [issue tracker][issue-tracker]
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## Code of Conduct
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All contributors are expected to follow our [Code of Conduct].
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## Bug reports
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We can't fix what we don't know about, so please report problems. This
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includes problems with understanding the documentation, unhelpful error messages,
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and unexpected behavior.
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You can open a new issue by following [this link][new-issues] and choosing one of the issue templates.
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## Feature requests
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Please feel free to open an issue using the [feature request template][new-issues].
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## Working on issues
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If you're looking for somewhere to start, check out the [E-easy][e-easy] and
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[E-mentor][e-mentor] tags.
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Feel free to ask for guidelines on how to tackle a problem on [Discord][discord] or open a
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[new issue][new-issues]. This is especially important if you want to add new
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features to SWC or make large changes to the already existing code-base.
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The SWC core developers will do their best to provide help.
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If you start working on an already-filed issue, post a comment on this issue to
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let people know that somebody is working it. Feel free to ask for comments if
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you are unsure about the solution you would like to submit.
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We use the "fork and pull" model [described here][development-models], where
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contributors push changes to their personal fork and create pull requests to
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bring those changes into the source repository. This process is partly
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automated: Pull requests are made against SWC's repository, tested and
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reviewed. Once a change is approved to be merged, a friendly bot merges the
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changes into an internal branch, runs the full test-suite on that branch
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and only then merges into master. This ensures that SWC passes the test-suite at all times.
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Steps to get started:
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- Fork SWC and create a branch from master for the issue you are working on.
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- Make sure you have the `make` utility installed, along with Rust and C/C++
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compilers.
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- Please adhere to the code style that you see around the location you are
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working on.
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- [Commit as you go][githelp].
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- Include tests that cover all non-trivial code. The existing tests
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in `test/` provide templates on how to test SWC's behavior in a
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sandbox-environment. The internal crate `testing` provides a vast amount
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of helpers to minimize boilerplate. See [`testing/lib.rs`] for an
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introduction to writing tests.
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- Run `cargo test` and make sure that it passes.
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- All code changes are expected to comply with the formatting suggested by `rustfmt`.
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You can use `rustup component add --toolchain nightly rustfmt-preview` to install `rustfmt` and use
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`rustfmt +nightly --unstable-features --skip-children` on the changed files to automatically format your code.
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- Push your commits to GitHub and create a pull request against the `swc-project/swc` `master` branch.
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## Getting your development environment set up
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After cloning the project there are a few steps required to get the project running.
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1. Fetch submodules to pull ECMAScript test suites.
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```bash
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git submodule update --init --recursive
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```
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2. Install js dependencies.
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```bash
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yarn add browserslist
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( cd ecmascript/transforms; yarn install )
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```
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3. Setup some environment variables which is required for tests.
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```bash
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export RUST_BACKTRACE=full
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export PATH="$PATH:$PWD/ecmascript/transforms/node_modules/.bin"
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```
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4. Install deno, if you are going to work on the bundler.
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See [official install guide of deno](https://deno.land/manual/getting_started/installation) to install it.
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5. Run tests
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```bash
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cargo test --all --all-features
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```
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## Pull requests
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After the pull request is made, one of the SWC project developers will review your code.
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The review-process will make sure that the proposed changes are sound.
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Please give the assigned reviewer sufficient time, especially during weekends.
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If you don't get a reply, you may ping the core developers on [Discord][discord].
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A merge of SWC's master-branch and your changes is immediately queued
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to be tested after the pull request is made. In case unforeseen
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problems are discovered during this step (e.g. a failure on a platform you
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originally did not develop on), you may ask for guidance. Push additional
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commits to your branch to tackle these problems.
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The reviewer might point out changes deemed necessary. Please add them as
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extra commits; this ensures that the reviewer can see what has changed since
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the code was previously reviewed. Large or tricky changes may require several
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passes of review and changes.
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Once the reviewer approves your pull request, a friendly bot picks it up
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and merges it into the SWC `master` branch.
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## Contributing to the documentation
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The SWC documentation can be found at [`swc-project/website`](https://github.com/swc-project/website/tree/master/pages/docs).
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At the bottom of each page on [swc.rs](https://swc.rs) there is a `Edit this page on GitHub` button that immediately links to the right page to edit.
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## Issue Triage
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Sometimes an issue will stay open, even though the bug has been fixed. And
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sometimes, the original bug may go stale because something has changed in the
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meantime.
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It can be helpful to go through older bug reports and make sure that they are
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still valid. Load up an older issue, double check that it's still true, and
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leave a comment letting us know if it is or is not. The [least recently
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updated sort][lru] is good for finding issues like this.
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Contributors with sufficient permissions on the SWC repository can help by
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adding labels to triage issues:
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- Yellow, **A**-prefixed labels state which **area** of the project an issue
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relates to.
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- Magenta, **B**-prefixed labels identify bugs which are **blockers**.
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- Red, **C**-prefixed labels represent the **category** of an issue.
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In particular, **C-feature-request** marks _proposals_ for new features. If
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an issue is **C-feature-request**, but is not **Feature accepted**,
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then it was not thoroughly discussed, and might need some additional design
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or perhaps should be implemented as an external subcommand first. Ping
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`@swc-project/swc` if you want to send a PR for an such issue.
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- Green, **E**-prefixed labels explain the level of **experience** or
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**effort** necessary to fix the issue. [**E-mentor**][e-mentor] issues also
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have some instructions on how to get started.
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- Purple gray, **O**-prefixed labels are the **operating system** or platform
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that this issue is specific to.
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- Orange, **P**-prefixed labels indicate a bug's **priority**.
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- Light orange, **L**-prefixed labels indicate language related to the bug.
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[gist]: https://gist.github.com/
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[new-issues]: https://github.com/swc-project/swc/issues/new/choose
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[e-easy]: https://github.com/swc-project/swc/labels/E-easy
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[e-mentor]: https://github.com/swc-project/swc/labels/E-mentor
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[code of conduct]: https://www.rust-lang.org/conduct.html
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[discord]: https://discord.gg/2ZhncgMt
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[`testing/lib.rs`]: https://github.com/swc-project/swc/blob/master/testing/src/lib.rs
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[irlo]: https://internals.rust-lang.org/
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[subcommands]: https://doc.rust-lang.org/cargo/reference/external-tools.html#custom-subcommands
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[issue-tracker]: https://github.com/swc-project/swc/issues
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