Typelevel.js

Run your Typelevel apps in browsers and Node.js with Scala.js. Deploy serverless functions with Feral and http4s. Build reactive frontends with Outwatch or ff4s or Calico and fs2-dom.

banana-rdf

RDF, SPARQL and Linked Data technologies

js / jvm

Typelevel Affiliate Project

calico

Pure, reactive UI library for building web applications with Cats Effect + FS2

js

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case-insensitive

A case-insensitive string for Scala

js / jvm / native

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Cats

A library intended to provide abstractions for functional programming in Scala, leveraging its unique features. Design goals are approachability, modularity, documentation and efficiency.

js / jvm / native

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Cats Collections

Data structures that facilitate pure functional programming with cats

js / jvm / native

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Cats-Effect

The IO Monad for Scala, plus type classes for general effect types.

js / jvm / native

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Cats MTL

Monad transformers made easy

js / jvm / native

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cats-parse

A parsing library for the cats ecosystem

js / jvm / native

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cats-scalatest

Scalatest bindings for Cats.

js / jvm

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cats-stm

A STM implementation for Cats Effect

js / jvm / native

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Cats Tagless

A library of utilities for tagless final algebras

js / jvm / native

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Cats-Time

Instances for Cats Typeclasses for Java 8 Time

js / jvm / native

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Circe

Yet another JSON library for Scala

js / jvm / native

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Ciris

Functional Configurations for Scala

js / jvm / native

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coulomb

A statically typed unit analysis library for Scala

js / jvm / native

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cron4s

Cross-platform CRON expression parsing for Scala

js / jvm

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decline

A composable command-line parser for Scala.

js / jvm / native

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discipline

Originally intended for internal use in spire, this library helps libraries declaring type classes to precisely state the laws which instances need to satisfy, and takes care of not checking derived laws multiple times.

js / jvm / native

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edomata

Event-driven automata for Scala, Scala.js and scala native. This library provides purely functional state machines that can be used to create event sourced and/or CQRS style applications. It also includes production ready backends.

js / jvm / native

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eff

Extensible effects are an alternative to monad transformers for computing with effects in a functional way. This library is based on the “free-er” monad and an “open union” of effects described by Oleg Kiselyov in “Freer monads, more extensible effects”

js / jvm / native

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fabric

Object-Notation Abstraction for JSON, binary, HOCON, etc.

js / jvm / native

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Feral

Feral cats are homeless, feral functions are serverless

js / jvm

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ff4s

A purely functional web frontend framework for Scala.js.

js

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Fetch

Library built on top of Cats that provides efficient data access from heterogeneous dataurces

js / jvm

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fs2-data

Parse and transform data (CBOR, CSV, JSON, XML) in a streaming manner

js / jvm / native

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fs2-dom

Idiomatic Cats Effect + FS2 integrations for Web APIs

js

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fs2

FS2 is a library for purely functional, effectful, and polymorphic stream processing library in the Scala programming language. Its design goals are compositionality, expressiveness, resource safety, and speed. The name is a modified acronym for Functional Streams for Scala (FSS, or FS2).

js / jvm / native

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Grackle

Functional GraphQL server for the Typelevel stack

js / jvm / native

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http4s

A typeful, purely functional HTTP library for client and server applications

js / jvm / native

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imp

Summoning implicit values

js / jvm

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jawn-fs2

Integration of jawn and fs2 for streaming, incremental JSON parsing

js / jvm / native

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keypool

A Keyed Pool Implementation for Scala

js / jvm / native

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Kittens

Automatic type class derivation

js / jvm / native

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Laika

Site and e-book generator and customizable text markup transformer for sbt, Scala and Scala.js

js / jvm

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Lepus

Purely functional, non-blocking RabbitMQ client for scala, scala js and scala native built on top of fs2.

js / jvm / native

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Libra

Compile time dimensional analysis for any problem domain

js / jvm

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literally

Compile time validation of literal values built from strings

js / jvm / native

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log4cats

Logging Tools For Interaction with cats-effect

js / jvm / native

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Monix

High-performance library for composing asynchronous, event-based programs, exposing a Reactive Streams implementation along with primitives for dealing with concurrency and side-effects.

js / jvm

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Monocle

Optics library offering a simple yet powerful API to access and transform immutable data

js / jvm / native

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Mouse

Enrichments to standard library classes to ease functional programming

js / jvm / native

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Natchez

functional tracing for cats

js / jvm / native

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otel4s

An OpenTelemetry library based on cats-effect

js / jvm / native

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Outwatch

The Functional and Reactive Web-Frontend Library for Scala.js

js

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parsley-cats

The parsley-cats library exposes Cats instances for Parsley parsing library.

js / jvm / native

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perspective

Provides tools for generic programming, and typeclasses for monad transformers and higher kinded data.

js / jvm

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refined

Tools for refining types with type-level predicates which constrain the set of values described by the refined type, for example restricting to positive or negative numbers.

js / jvm / native

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ScalaCheck

ScalaCheck is a library for automated property-based testing. It contains generators for randomized test data and combinators for properties.

js / jvm / native

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scalacheck-shapeless

Automatic derivation for ScalaCheck

js / jvm / native

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Scala Exercises

Platform and framework for Scala devs to learn about Scala libraries

js / jvm

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scodec

scodec is a combinator library for working with binary data. It focuses on contract-first and pure functional encoding and decoding of binary data and provides integration with shapeless.

js / jvm / native

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Scoverage

Code coverage tool for Scala

js / jvm / native

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Shapeless

Shapeless is a generic programming library. Starting with implementations of Scrap your boilerplate and higher rank polymorphism in Scala, it quickly grew to provide advanced abstract tools like heterogenous lists and automatic instance derivation for type classes.

js / jvm / native

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simulacrum

First-class syntax for type classes

js / jvm / native

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Simulacrum Scalafix

Simulacrum as Scalafix rules

js / jvm

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singleton-ops

Operations for primitive and String singleton types

js / jvm

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Skunk

A data access library for Scala + Postgres

js / jvm / native

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specs2

specs2 is a library for writing executable software specifications, aiming for conciseness, readability and extensibility.

js / jvm / native

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spire

Spire is a numeric library for Scala which is intended to be generic, fast, and precise. Using features such as specialization, macros, type classes, and implicits, Spire works hard to defy conventional wisdom around performance and precision trade-offs.

js / jvm / native

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Squants

The Scala API for Quantities, Units of Measure and Dimensional Analysis

js / jvm / native

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Twiddles

Micro-library for building effectful protocols

js / jvm / native

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typelevel.g8

A Giter8 template for sbt-typelevel

js / jvm

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typelevel-nix

Development tools for Typelevel projects

js / jvm / native

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uniform-scala

Functional user journeys

js / jvm

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upperbound

A purely functional, interval based rate limiter

js / jvm / native

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vault

Type-safe, persistent storage for values of arbitrary types

js / jvm / native

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