Perry User Guide

Perry is scaffolded using tsdx.

Commands

TSDX scaffolds your new library inside /src.

To run TSDX, use:

yarn start

This builds to /dist and runs the project in watch mode so any edits you save inside src causes a rebuild to /dist.

To do a one-off build, use yarn build.

To run tests, use yarn test.

Configuration

Code quality is set up for you with prettier, husky, and lint-staged.

Jest

Jest tests are set up to run with yarn test.

Bundle Analysis

size-limit is set up to calculate the real cost of your library with yarn size and visualize the bundle with yarn analyze.

Rollup

TSDX uses Rollup as a bundler and generates multiple rollup configs for various module formats and build settings. See Optimizations for details.

TypeScript

tsconfig.json is set up to interpret dom and esnext types, as well as react for jsx. Adjust according to your needs.

Continuous Integration

GitHub Actions

Two actions are added by default:

• main which installs deps w/ cache, lints, tests, and builds on all pushes against a Node and OS matrix
• size which comments cost comparison of your library on every pull request using size-limit

Optimizations

Please see the main tsdx optimizations docs. In particular, know that you can take advantage of development-only optimizations:

// ./types/index.d.ts
declare var __DEV__: boolean;

// inside your code...
if (__DEV__) {
  console.log('foo');
}

You can also choose to install and use invariant and warning functions.

Module Formats

CJS, ESModules, and UMD module formats are supported.

The appropriate paths are configured in package.json and dist/index.js accordingly. Please report if any issues are found.

Named Exports

Per Palmer Group guidelines, always use named exports. Code split inside your React app instead of your React library.

Publishing to NPM

Run yarn version. Maintainers with publishing rights alone shall be able to publish to NPM.

Branching Workflows

Branch naming conventions

1. Use the following structure for naming any feature branch: ${username}/#${issue-number}-${some-title}.
2. You can read more about the reasoning here.
3. The first portion of the branch name ${username}/... is a "grouping token". It helps in clubbing all the branches owned by a particular user.

Pushing a new feature

We follow the Git Feature Branch Workflow for pushing new features into the master branch.

Commits Format

• We use the conventional commits specification to decide how to format our commit messages.
• This is not strictly enforced at the moment but the developers are expected to follow this specification while commiting important changes like bringing in a new feature, making a breaking change to the API, or any change that the developer feels should be reflected in the CHANGELOG in the subsequent release.
• Conventional commits integrate well with the SemVer versioning pattern and this compatibility is the main reason for its adoption.
• conventional-changelog-cli is used in the yarn version CLI giving us the power to automate the CHANGELOG generation.
• The Conventional Commits extension makes the formating & compliance of the commit messages a cake-walk!

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