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CONTRIBUTING.md

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Rspack Contributing Guide

Thank you for your interest in contributing to Rspack! Before starting your contribution, please take a moment to read the following guidelines.

Sending a Pull Request

  1. Fork the Rspack repository into your own GitHub account.
  2. Clone the repository to your local.
  3. Checkout a new branch from main.
  4. Set up the development environment, you can read the "Setup Development Environment" section below to learn about it.
  5. If you've fixed a bug or added code that should be tested, then add some tests.
  6. Make sure all the tests pass, you can read the "Testing" section below to learn about it.
  7. Run pnpm run lint:js and pnpm run lint:rs to check the code style.
  8. If you've changed some Node.js packages, you should add a new changeset. Run pnpm run changeset, select the changed packages and add the changeset info.
  9. If you've changed some Rust packages, you should add a new changeset for @rspack/binding package.
  10. Submit the Pull Request, make sure all CI runs pass.
  11. The maintainers will review your Pull Request soon.

When submitting a Pull Request, please note the following:

  • Keep your PRs small enough, so that each PR only addresses a single issue or adds a single feature.
  • Please include an appropriate description in the PR, and link related issues.

Setup Development Environment

Setup Rust

  • Install Rust using rustup.
  • If you are using VSCode, we recommend installing the rust-analyzer extension.

Setup Node.js

Install Node.js

We recommend using the LTS version of Node.js 16. You can check your currently used Node.js version with the following command:

node -v
#v16.18.0

If you do not have Node.js installed in your current environment, you can use nvm or fnm to install it.

Here is an example of how to install the Node.js 16 LTS version via nvm:

# Install the LTS version of Node.js 16
nvm install 16 --lts

# Make the newly installed Node.js 16 as the default version
nvm alias default 16

# Switch to the newly installed Node.js 16
nvm use 16

Install Dependencies

Install Node.js dependencies via pnpm.

# enable pnpm with corepack
corepack enable

# or install pnpm directly
npm install -g pnpm@7

# Install dependencies
pnpm run init

Setup Other Dependencies

  • Install protoc for building sass-embedded.

Final

  • Open Rspack project.
  • Run cargo build to compile Rust code.
  • Run pnpm run build:cli:debug to compile both Node.js and Rust code.

Testing

We currently have two sets of test suits, one for Rust and one for Node.js.

Rust Testing

  • cargo test will run all the rust side tests, which includes standalone tests for core functionality and plugins.
  • UPDATE=1 cargo test will automatically update the failed snapshot

Node Testing

# In root path
pnpm --filter "./packages/**" run build && pnpm --filter "./packages/**" run test

Or only test the package that you made the changes:

# In the Node.js package path
pnpm run build && pnpm run test

Node Testing Suit Overview

We use jest for nodejs tests, The most important test cases are the case in the packages/rspack. most of these cases comes from webpack https://github.com/webpack/webpack/tree/main/test because we want to make sure that Rspack can work as same as webpack.

There are three kinds of integration cases in @rspack/core.

case.test.ts

Cases are used to test normal build behavior, we use these cases to test against bundler core functionality, like entry, output, module resolve, etc. it will first build your test file to test whether the input could be compiled successfully, then it will use the bundled test file to run test cases in the test file to test bundler's all kinds of behavior.

configCase.test.ts

Cases are used to test custom build behavior, you could use custom webpack.config.js to override default build behavior, you can use these cases to test against behavior related to specific config.

statsTestCase.test.ts

Cases are used to test your stats, By Default we will use jest's snapshot to snapshot your stats, and we highly recommend to avoid snapshot except statsCase. you can use statsCase to test behaviors like code splitting | bundle splitting, which is hard to test by just running code.

Release

To make releasing easier, Rspack use github action to automate creating versioning pull requests, and optionally publishing packages.

Debugging with VSCode

  1. Install go install github.com/go-delve/delve/cmd/dlv@latest
  2. Install vscode extension rust-analyzer and CodeLLDB
  3. build @rspack/cli and napi binding by run ./x build cli:debug
  4. In Vscode's Run and Debug tab, select debug-rspack to start debugging the initial launch of @rspack/cli, This task is configured in .vscode/launch.json, which launch node debugger and rust debugger together. so you can debug both rust and nodejs code.