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Contributing Guidelines

Thank you for your interest in contributing to our project! 💛

Whether it's a bug report, new feature, correction, or additional documentation, we greatly value feedback and contributions from our community. Please read through these guidelines carefully before submitting a PR or issue and let us know if it's not up-to-date (or even better, submit a PR with your corrections 😉).

Our History and Ethos

AWS Amplify aims to enhance the development experience using JavaScript with AWS. Amplify codifies best practices through programmatic interfaces to help you effortlessly interact with cloud resources.

First and foremost Amplify exposes to you WHAT things do and then HOW best to do them. The WHAT is at a functional use case with HOW being an opinionated implementation that you can override with “escape hatches.” This will allow you to have higher velocity and build better applications by focusing less on implementation choices. Secondly, Amplify should be a manifestation of The Rule of Least Power when developing against AWS. This means it encourages architectural and programmatic best practices and the ability to start quickly. This shows by encouraging certain services (API Gateway usage vs. direct DynamoDB interaction) or certain connection patterns (Circuit breaker, retry counts and throttle up/down).

Opinionated implementations: There are many ways to interface with AWS Services. Certain service interactions are favored over others. For instance, if sending and receiving JSON, we would prefer an API Gateway endpoint to other mechanisms. Amplify will programmatically help optimize for cost and performance through library decisions.

Declarative actions: Amplify will provide you a reference to a generic client object and the ability to perform common actions. “RegisterUser”, “Login”, “SendObject”, “UpdateObject”, “StreamData”. By default you should not need to worry about AWS Service specific API operations like putItem() with a unique hash or even HTTP verbs.

Cascading service interactions: Certain actions in a declarative style can have overlapping or ambiguous AWS Service implementations. With an opinionated implementation, we can decide which Services are "primary" and which are "secondary" depending on what is configured. For instance, sending an image will prefer S3 over API Gateway.

Simple, standard data objects: Sending & receiving data to AWS Services can have many parameters, which tend to show up in the SDKs. These are abstracted and inferred, where possible, with simple JSON that the implementation can reason about. Standard parameters (bucket names, stream names, partition keys, etc.) that are part of the implementation are extracted from a simplified configuration file and dynamically generated/updated in order to further allow focus on state and data types only.

Our Design

As more and more modules were introduced to AWS Amplify, it became necessary to modularize the library into smaller pieces so that users could avoid importing unnecessary parts into their app. The goal of this design is to make AWS Amplify modularized and also keep it backward-compatible to avoid breaking changes.

Modular import prevents unnecessary code dependencies from being included with the app, and thus decreases the bundle size while enabling added new functionality without the risk of introducing errors related to unused code.

Amplify has established the concepts of categories and plugins. A category is a collection of api calls that are exposed to the client to do things inside that category. For example, in the storage category, generally one wants to upload and download objects from storage so the apis exposed to the client will represent that functionality. Because Amplify is pluggable, a plugin of your choosing will provide the actual implementation behind that api interface. Using the same example of Storage, the plugin we choose might be AWSStoragePlugin which would then implement each api call from the category with a service call or set of service calls to S3, the underlying storage provider of the AWS plugin.

Development Process

Our work is done directly on Github and PR's are sent to the GitHub repo by core team members and contributors. Everyone undergoes the same review process to get their changes into the repo.

Setting up for local development

This section should get you running with Amplify JS and get you familiar with the basics of the codebase. You will need Node.js on your system and developing locally also requires yarn workspaces. You can install it here.

The recommended version of Node JS to work with this project is 16.19.0 with Yarn version 1.22.x.

Note: newer versions of Yarn (2+) remove support for lerna's --mutex flag so be sure to use Yarn v1.22.x

Start by forking the main branch of amplify-js.

git clone git@github.com:[username]/amplify-js.git
cd amplify-js

yarn
yarn bootstrap
yarn build

Note: Make sure to always sync your fork with main branch of amplify-js

Architecture of the codebase

Amplify JS is a monorepo built with Yarn and Lerna. All the categories of Amplify live within the packages directory in the root. Each category inside packages has its own src/ and package.json.

Packages inside Amplify JS Monorepo

Steps towards contributions

  • To make changes with respect to a specific category, go into packages/[category].
  • Make changes to required file.
  • Write unit tests
  • Yarn build
  • Run test suite
  • Test in sample app using yarn linking
  • Submit a PR

Build step:

yarn build --scope @aws-amplify/auth

Testing:

yarn run test --scope @aws-amplify/auth

Note: There is a commit hook that will run the tests prior to committing. Please make sure if you are going to provide a pull request to be sure you include unit tests with your functionality and that all tests pass.

Test in a local sample app

Yarn Linking The best way to develop locally and test is to link the individual package you’re working on and run lerna in watch mode.

Note: to test using the react-native framework you will need to use Verdaccio

Run watch mode while editing (auth for example):

npx lerna exec --scope @aws-amplify/auth yarn link
npx lerna exec --scope @aws-amplify/auth yarn build:watch

Or run the whole library in watch mode if you are working on multiple packages

yarn build # Build the whole library
yarn link-all # Make all the packages available to link
yarn build:watch # All packages are building in watch mode

In your sample project, you can now link specific packages

yarn link @aws-amplify/auth

Passing unit tests are only necessary if you’re looking to contribute a pull request. If you’re just playing locally, you don’t need them. However, if you’re contributing a pull request for anything other than making a change to the documentation, fixing a formatting issue in the code (i.e., white space, missing semi-colons) or another task that does not impact the functionality of the code, you will need to validate your proposed changes with passing unit tests.

Verdaccio

Verdaccio is a lightweight private npm proxy registry built in Node.js. Install Verdaccio. You can setup Verdaccio to publish packages locally to test the changes.

To publish in Verdaccio, start a Verdaccio instance and then,

yarn config set registry http://localhost:4873/
yarn publish:verdaccio

To publish a local version of a specific package,

cd packages/<category>
yarn publish --registry http://localhost:4873/

Once you are done with Verdaccio, you can reset to the default registry by doing,

yarn config set registry https://registry.yarnpkg.com

Bundle Size Checks

Amplify JS enforces bundle size checks against incoming PRs. It uses the size-limit utility to test the Webpack tree-shaken footprint of common import patterns for a given category.

The configuration for each category can be found in the associated package's package.json file under the size-limit key.

Local Invocation & Regression Debugging

The bundle size test can be performed locally (after building) by invoking the test:size build target from either a specific category or from the mono-repo package. Bundle size regressions associated with a given change can be debugged by specifying the --why flag, e.g. yarn test:size --why, which will open a Statoscope instance to permit analysis of the generated bundle. Some specific techniques for digging into regressions are outlined below.

Compare yarn.lock files Comparing yarn.lock files for each build can be a useful way to determine if your dependency graph has changed (which may have trickle down effect on Amplify's bundle size). The easiest way to do this is to download the yarn.lock files from the build step in CircleCI (under the "Artifacts" tab) for the failing build and an older passing build. These files can then be diffed locally to see if your dependency graph has changed: diff yarn-passing.lock yarn-failing.lock.

Compare stats.json files The Webpack stats.json file contains a static analysis for a particular bundle. To generate these files locally, checkout & build the failing change, navigate to the category that's failing, and execute the following command: yarn test:size --save-bundle test_bundle. The generated stats.json file can be found in the new test_bundle directory. Make sure to copy this file somewhere safe for analysis. Next rebuild your parent branch (typically main) and compare bundles using the following command: yarn test:size --why --compare-with stats-failing.json. This will open a Statoscope instance in your browser. The "Choose stats" & "Diff" buttons on the top right can be used to inspect & compare your bundles.

stats.json files can also be plugged into other popular bundle analysis tools if desired.

Bug Reports

Bug reports and feature requests are always welcome. Good bug reports are extremely helpful, so thanks in advance!

When filing a bug, please try to be as detailed as possible. In addition to the bug report form information, details like these are incredibly useful:

  • A reproducible test case or series of steps
  • The date/commit/version(s) of the code you're running
  • Any modifications you've made relevant to the bug
  • Anything unusual about your environment or deployment

Guidelines for bug reports:

  • Check to see if a duplicate or closed issue already exists!
  • Provide a short and descriptive issue title
  • Remove any sensitive data from your examples or snippets
  • Format any code snippets using Markdown syntax
  • If you're not using the latest version of a specific package, see if the issue still persists after upgrading - this helps to isolate regressions!

Finally, thank you for taking the time to read this, and taking the time to write a good bug report.

Pull Requests

Pull requests are welcome!

You should open an issue to discuss your pull request, unless it's a trivial change. It's best to ensure that your proposed change would be accepted so that you don't waste your own time. If you would like to implement support for a significant feature that is not yet available, please talk to us beforehand to avoid any duplication of effort.

[Skip step 1 to 3 if you have already done this]

  1. Fork aws-amplify/amplify-js

  2. Clone your fork locally: git clone git@github.com:YOUR_GITHUB_USERNAME/amplify-js.git

  3. Run yarn && yarn bootstrap in the repository root

  4. Within your fork, create a new branch based on the issue (e.g. Issue #123) you're addressing - git checkout -b "group-token/short-token-[branch-name]" or git checkout -b "short-token/[branch-name]"

    • Use grouping tokens at the beginning of the branch names. For e.g, if you are working on changes specific to amplify-ui-components, then you could start the branch name as ui-components/...
    • short token
      • feat: A new feature
      • fix: A bug fix
      • docs: Documentation only changes
      • style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.)
      • refactor: A code change that neither fixes a bug nor adds a feature
      • perf: A code change that improves performance
      • test: Adding missing tests or correcting existing tests
      • build: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
      • ci: Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs)
      • chore: Other changes that don't modify src or test files
      • revert: Reverts a previous commit
    • Use slashes to separate parts of branch names
    • Hyphenate well-defined branch name

  5. Be sure to write tests to cover any added or modified code. Be especially vigilant when testing changes that affect shared code resources in order to catch problems such as race conditions. Once your work is committed and you're ready to share, run test yarn test on root-level package.

    Note: Manually test your changes in a sample app with different edge cases and also test across different browsers and platform

  6. Then, Push your branch git push origin -u

  7. This previous step will give you a URL to view a GitHub page in your browser. Copy-paste this, and complete the workflow in the UI. It will invite you to "create a PR" from your newly published branch. Fill out the PR template to submit a PR.

  8. Finally, the Amplify JS team will review your PR. Add reviewers based on the core member who is tracking the issue with you or code owners. In the meantime, address any automated check that fail (such as linting, unit tests, etc. in CI)

Debugging

Sometimes the issue can be solved by doing a clean and fresh build. To do this, make sure to remove your node modules and clean your packages. You can run git clean -xdf in the repository root to achieve this.

Release

To give a bird's eye view of the release cycle,

  • We follow semantic versioning for our releases
  • Every merge into the main ends up as unstable package in the npm
  • The core team will cut a release out to stable from unstable bi-weekly

Finding contributions to work on

Looking at the existing issues is a great way to find something to contribute on. As our projects, by default, use the default GitHub issue labels (enhancement/bug/duplicate/help wanted/invalid/question/wontfix), looking at any help wanted or good first issue is a great place to start.

You could also contribute by reporting bugs, reproduction of bugs with sample code, documentation and test improvements.

Related Repositories

The Amplify Framework runs on Android, iOS, and numerous JavaScript-based web platforms.

  1. AWS Amplify for iOS
  2. AWS Amplify for Android
  3. AWS Amplify CLI

AWS Amplify plugins are built on top of the AWS SDKs. AWS SDKs are a toolkit for interacting with AWS backend resources.

  1. AWS SDK for Android
  2. AWS SDK for iOS
  3. AWS SDK for JavaScript

Code of Conduct

This project has adopted the Amazon Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opensource-codeofconduct@amazon.com with any additional questions or comments.

Security issue notifications

If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security via our vulnerability reporting page. Please do not create a public GitHub issue.

Licensing

See the LICENSE file for our project's licensing. We will ask you to confirm the licensing of your contribution.

We may ask you to sign a Contributor License Agreement (CLA) for larger changes.