Web applications

A listing of libraries and modules we use in every app.

Libraries

Library	Purpose
Babel	Can transform and polyfill advanced JavaScript syntax to be supported on older browsers
Emotion	CSS-in-JS library
ESLint	Static code analysis for JavaScript
Formik	React library for building forms
GraphQL + Apollo	Query language for APIs; GraphQL client
Hapi	Node.js web server framework
Jest	JavaScript unit testing library
Lerna	Monorepo management library
NextJS	Provides server-side rendering for React
Prettier	Code style enforcement tool
React	Front end UI library
Rollup	A module bundler for JavaScript
Yarn	Node package manager

@cityofboston internal modules

Useful modules we’ve created and use across our apps in the monorepo.

Module	Purpose
config-babel
config-jest-babel	Jest preset for projects that use Babel in their build process
config-jest-typescript	Jest preset for pure TypeScript projects. Loads files with ts-jest-babel-7
config-typescript	TypeScript configuration files that can be used in other packages so that we have a default set of TypeScript configurations
deploy-tools
graphql-typescript	Utilities for type-safe GraphQL resolvers
hapi-common
hapi-next
mssql-common
mssql-typescript
next-client-common
percy-common
react-fleet	Common React components
srv-decrypt-env