Candidate Libraries for the Scala Platform

pathikrit · January 12, 2017, 10:01pm

After years of working on many Scala projects, I have formed my personal highly opinionated list of goto libraries for common stuff:

gist.github.com

https://gist.github.com/pathikrit/892a3a254c84f274a007ef9d763e11dd

README.md

[Libraries](https://scala.libhunt.com/)
---
* Web: [Play](https://www.playframework.com/) (framework) or [Finch](https://github.com/finagle/finch) (library)
* Actors: [akka](http://doc.akka.io/docs/akka/snapshot/scala.html)
* Asynchronous Programming: [monix](https://monix.io/) (for tasks, reactors, observables, scheduler etc)
* Authentication: [Silhouette](http://silhouette.mohiva.com/)
* Authorization: [Deadbolt](http://deadbolt.ws/)
* Command-line option parsing: [case-app](https://github.com/alexarchambault/case-app)
* CSV Parsing: [delimited](https://github.com/tixxit/delimited)
* DB: [doobie](https://github.com/tpolecat/doobie) (for PostgreSQL)

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Libraries

Web framework: Play
Actors: akka
Asynchronous Programming: monix (for tasks, reactors, observables, scheduler etc)
Authentication: Silhouette
Authorization: Deadbolt
CSV Parsing: delimited
ORM: doobie (for PostgreSQL)
Evolutions: flyaway
I/O: better-files
JSON: circe + rapture-json (for dynamic JSON access)
Enums: enumeratum
Records: scala-records
DI: macwire
Config: ssc/ficus
Logging: log4s
RPC: remotely
Caching: scalacache
Templating: ssp
Utils: pimpathon, scalactic, rapture, shapeless
Algebra: cats + monocole
Numeric: spire, squants
Codecs: scodec
Java Integration: scala-time, scala-java8-compat
Data Validation: accord, refined
Streams: swave
ScalaJS: scalajs-react + Components

If you are using Play, these are reasonable alternatives to above since these have better out-of-the-box Play support:

ORM: slick + slick-pg + type-checked SQL (for PostgreSQL)
Evolutions: play-evolutions
JSON: play-json + play-json-derived + support for >22 fields
Logging: play-logger
Templating: twirl
ScalaJs + Play

Code Quality

Testing: ScalaTest + ScalaCheck
Coverage: https://codecov.io + scoverage
CI: CircleCI
Lint: wartremover, linter, etc
Code style: ScalaStyle
Codacy: https://www.codacy.com/
Error Monitoring: OverOps + Loggly + NewRelic

sbt plugins

A subset of these would be nice additions to SP. Don’t know the process here. Should we eval them? Contact authors?

martijnhoekstra · January 14, 2017, 2:31pm

I’ve been looking at the dependency graph for the runtime dependencies for (only) the libraries. Many libraries on the list don’t have a 2.12 release. For 2.12, the top dependencies by PageRank according to gephi from the GraphML file exported by sbt dependency graph are

scala reflect
macro compat
machinist
scalaz core
simulacrum
slf4j
sbt test interface
reactive streams
cats core

For 2.11, that list becomes

scala reflect
scala compiler
macro compat
slf4j
netty common
netty buffer
scala xml
netty transport
machinist
parser combinators
rapture core
reactive streams
scalaz core

Rapture, which is a metapackage of 31 sub-packages, seems to be a “platform” all by itself. All references to rapture core seem to come from that metapackage

Removing rapture, and pruning evicted dependencies gives the “top list”

slf4j
macro-compat
netty-common
netty-buffer
typesafe config
netty-transport
scalaz-core
machinist
reactive streams
play
commons codec
play-silhouette
jackson core
simulacrum
sbt test interface
netty codec

That could give some insights on what important dependencies to standardize on and/or whitelist are.

No-dependencies libraries in the list are

scala-time
better files
typesafe config
quants
swave

Those could make for relatively easy adoption discussions.