typelevel/cats-effect v1.0.0-RC2

on GitHub

This is the second and final release candidate before 1.0 — it's not a planned release candidate, but due to a flurry of activity and awesome PRs from FS2, Monix and Http4s contributors, we can't release a 1.0 with so much being added, a total of 35 PRs, which aren't light at all, a record for this project.

List of Changes

New data types:

1. Resource (doc) — #188
2. Ref (doc) and Deferred (doc) — #204, #211, #218 and #220
3. Semaphore (doc) — #205
4. MVar (doc) — #217, #222, #223, #224
5. IOApp(doc) — #213, #252

Major behavioral / breaking changes:

• #232: Require Timer and shift automatically in concurrent operations
• #237, #254: Restate Concurrent laws to accept auto-cancelable run-loops
• #241: Move uncancelable to Bracket, change Bracket laws to make acquire and release uncancelable
• #195, #215 and #261: Add Effect#runSyncStep, fixing #104
• #248, #258: Introduce Async.asyncF
• #221: add toIO operation to Effect

Added Features:

• #191: Add IO#redeemWith, in combination with the future typelevel/cats/pull/2237
• #214: Add IO#timeout and Concurrent.timeout
• #236: Bracket instance for Kleisli
• #234: bracket should work on top of JavaScript via unsafeRunSync
• #235: remove NonFatal, switch to the standard one
• #250: Optimize async trampoline, add ContextSwitch
• #255, #257: use the standard Throwable#addSuppressed in bracket when both use and release throw
• #253: Add a la carte syntax package, syntax for Bracket and timeouts

Docs:

• #201: Docs for parTraverse and parSequence
• #203: Docs for Resource, Deferred, Ref and Semaphore
• #238: Docs for Resource

Bug fixes and chores:

• #225: IOTimer does not use the parameter specified
• #260: Exclude non-terminating laws from default set
• #259: Decrease default stackSafeIterationsCount in laws

Getting Involved

You can always help with:

1. Feedback by joining us on Gitter
2. Re-tweet the release announcement
3. Give us a star on GitHub 🙂

Special Thanks

This release was made possible by: @rossabaker, @mpilquist, @SystemFw, @oleg-py, @johnynek, @durban, @ptravers, @stephennancekivell, @gvolpe, @ajaychandran and @alexandru .
(apologies if I forgot anybody)

Thanks to all those involved!