I am trying to use a npm package in cljs called "systeminformation"
most of its function are async and some are non-async
but I am unable to use async function, everything else work fine
RELATED IMPORTS
[clojure.core.async :as async]
["systeminformation" :as systeminformation]
Code I am trying to run
(comment
(systeminformation/version) // WORKS FINE
(async/go
(async/<! (systeminformation/cpu))) // Gives me error
)
ERROR:
INFO [mutesync.inspect.electron.background.main:30] - STACK
TypeError: c.cljs$core$async$impl$protocols$ReadPort$take_BANG_$arity$2 is not a function
at cljs$core$async$impl$ioc_helpers$take_BANG_ (D:\Tom\mutesync\.shadow-cljs\builds\electron-main\dev\out\cljs-runtime\cljs\core\async\impl\ioc_helpers.cljs:52:1)
at switch__47338__auto__ (<eval>:8:52)
at <eval>:32:29
at Function.fexpr__47378 [as cljs$core$IFn$_invoke$arity$1] (<eval>:54:4)
at Object.cljs$core$async$impl$ioc_helpers$run_state_machine [as run_state_machine] (D:\Tom\mutesync\.shadow-cljs\builds\electron-main\dev\out\cljs-runtime\cljs\core\async\impl\ioc
_helpers.cljs:43:3)
at cljs$core$async$impl$ioc_helpers$run_state_machine_wrapped (D:\Tom\mutesync\.shadow-cljs\builds\electron-main\dev\out\cljs-runtime\cljs\core\async\impl\ioc_helpers.cljs:45:1)
at <eval>:84:67
at Immediate.cljs$core$async$impl$dispatch$process_messages (D:\Tom\mutesync\.shadow-cljs\builds\electron-main\dev\out\cljs-runtime\cljs\core\async\impl\dispatch.cljs:26:7)
at processImmediate (internal/timers.js:456:21)
ERROR [mutesync.inspect.electron.background.main:68] - uncaught error
TypeError: c.cljs$core$async$impl$protocols$ReadPort$take_BANG_$arity$2 is not a function
Async functions in JS are syntax sugar for functions returning a Promise
.
core.async
does not work with Promises by default and you need to use the helper function to make them act like channels if you want to. The <p!
macro does this for you.
(ns test.foo
(:require
[clojure.core.async :as async]
[cljs.core.async.interop :refer (<p!)]
["systeminformation" :as systeminformation]))
(async/go
(prn (<p! (systeminformation/cpu))))
Alternatively you can just .then
or .catch
the Promise with a callback. There is no need for core.async
when doing so.
(-> (systeminformation/cpu)
(.then prn))
There is also a guide available on the topic.