A promise library & concurrency toolkit for Clojure and ClojureScript.

This library exposes a bunch of useful syntactic abstractions that considerably simplify working with promises (in a very similar way as you will do it in JS with async/await) and many helpers from executors to concurrency patterns (bulkhead & CSP). With 0 runtime external dependencies.

Here you can look a detailed documentation.

Getting Started

deps.edn:

funcool/promesa {:mvn/version "12.0.1"}

You also can get it via git:

funcool/promesa
{:git/sha "7d841fc"
 :git/tag "12.0.1"
 :git/url "https://github.com/funcool/promesa"}

On the REPL

(require '[promesa.core :as p])
(->> (p/promise 1)
     (p/map inc)
     (deref)
;; => 2

NOTE: example only work on JVM because the evident lack of blocking primitives on JS runtime.

Contributing

If you miss something, feel free to open an issue for a discussion. If there is a clear use case for the proposed enhancement, the PR will be more than welcome.

Testing

Run the Clojure (.clj) tests:

clojure -M:dev -m promesa.tests.main

Run the ClojureScript (.cljs) tests:

corepack enable
corepack install
yarn install
yarn run test

Run the Babashka tests:

bb test:bb