Ah so it's like... an internal subsciber?

yep. what inputs are you about to use

it kinda looks like a little ear 👂 :<- for listening

That's.. one way to remember that

Hi, I have a cljs macro question/issue. I have some macro code that generates re-frame subscriptions based on a mini-DSL. I think I’ve followed all the guidance for them. The macro is in a separate namespace, and in a .cljc, etc. I need to have the macro execute when the file loads so I have an inline call to it in the file where it’s included. It seemed to be working at one point but now it doesn’t seem to get called at all, and I can’t figure out why

;;; macros.cljc  
(defn gen-calc-sub
  [calcs [field [calc args]]]
  (print "creating sub for: " field)
  `(rf/reg-sub
     ~field
     (fn [_# _#]
       ~(mapv (fn [arg] (if (calcs arg)
                          `(rf/subscribe [~arg])
                          `(rf/subscribe [:form/cur-field ~arg]))) args))
     (fn [args#]
       (calc/run-calc ~calc args#))))

(defmacro gen-calc-subs
  [calcs]
  (print "creating subs for: " calcs)
  (let [calc-fields (set (map first calcs))                 ;for quick membership test
        ]
    `(do ~@(map #(gen-calc-sub calc-fields %) calcs))))  

;;; file where it's used
(ns f.....events-subs
 ...
  (:require-macros [....macros :as fm]))
...
;;; invocation
(fm/gen-calc-subs {:sf425/cash-on-hand
                [:calc/subtract [:sf425/cash-received :sf425/cash-disbursed]]  })

@eoliphant ... works in CLJS repl ? o.O

I’m trying to use a NPM module (https://github.com/conorhastings/react-syntax-highlighter) in my project, but I can’t quite figure out how to get it working. Initially, I just added :npm-deps {"react-syntax-highlighter" "7.0.2"} to my cljsbuild :compiler config. This caused figwheel to fail with Error: Cannot find module '@cljs-oss/module-deps'. I eventually figure out that I had to run npm install @cljs-oss/module-deps, which fixed the error. Is there a better way to do this? Anyway, I’ve since been trying to import the code, but none seem to work. AFAICT I’m supposed to be able to just do (:require [react-syntax-highlighter]), but that gives me a “No such namespace” error. So does pretty much everything else I’ve tried. (FWIW I have verified that node_modules/react-syntax-highlighter exists). What am I missing here?

@wombawomba I’m curious, did you have :install-deps true set as a compiler option?

I did not… will try with that enabled and see how it goes 🙂 I guess I did npm install react-syntax-highlighter to get it in place

I still seem to get No such namespace; react-syntax-highlighter, even with :install-deps true enabled

@soya yes it seems to work in the repl

ive got some code to generate a largeish (a few mbs) data structure from a text file; id like to pregenerate this data structure and then distribute it with the rest of the cljs code to live in memory on the client. whats the best way of going about this?

What’s the purpose of the data structure, is it a javascript object, or is it used as clojure data?

I have a silly little app that uses hiccup for generating html. I’d like to do this in ClojureScript, since it’s going to be in AWS lambda. I’m looking at a few forks of hiccup that promise to work with Cljs but they’re pretty old. Another strategy would be to do it in React, but it seems like a detour to first generate dom elements and then render them to a string. Any thoughts?

I use https://github.com/teropa/hiccups for now, but it’s old and some things from hiccup are not supported. from https://github.com/weavejester/hiccup/issues/127 it’s not clear if cljs will be supported by hiccup

the data structure is for use as clojure data... eg its representing a tree and so is queried by clojurescript functions.

Yes, mine is the same, I have cljc function generating the data structures and with either hiccup or hiccups I turn them intro a string

Hey everyone! I have a question about stacktraces within nodejs targets. With :optimizations set to :simple I can’t make cljs files appear in them. My assumption is that sourcemaps aren’t used for some reason. I’ve made a simple demo here https://github.com/mkarp/cljs-sourcemap-demo. Any ideas and feedback are welcome!

It looks like clojurescript defines the cljs.spec.alpha namespace across two files: alpha.cljs and alpha.cljc. Is there a defined order those files are read in? Can they not reference each other at all? I made a toy project with a .cljc, .cljs, and .clj all with the same name and namespace which, on requireing it in a clojure repl, gave me access to stuff from the .clj file but not the .cljc file

.cljc will be searched only if .clj or .cljs are not found (depending on the env, of course). (AFAIK)

How does it work in cljs.spec.alpha, then?

My guess is that .cljc only contains specs for macros? Since macros are expanded in Clojure, not CLJS.

(Note, I don’t have first-hand experience here, just I’ve seen this pattern a lot in the channel)

Aha! It's the reverse, in fact—the .cljc file (mostly) only contains macros for specs, and the .cljs file's ns form :refer-macross "itself" to "get" them

Thanks for the help! I'm almost entirely a clj dev but I'm trying to make a library cross-platform

Hah, I’m not even a clj dev (…yet) — just been reading a lot 🙂 — note, I think recent CLJS added some :require sugar so you might not need to do :refer-macros any more — need to search for this.

It looks like require('source-map-support').install(); isn't emitted with :target nodejs and simple optimizations with clojurescript 1.10.238 (it is emitted with "optimzations none"). You can enable sourcemaps by adding (.install (js/require "source-map-support")) to your code. Is this the expected behavior?

This is with cljsbuild

oh, that is suprising a bit, I have noticed the same but I thought "it was just me"

@richiardiandrea yeah not having used the node target before I'm not sure if my expectation — that the "source-map-support" shim should be included automatically — is correct

not sure either, would wait for someone like David to answer, I now do what you did above in my lumo code

Just tried it with cljs.main and it seems to work there. Maybe a lein cljsbuild issue?

Soo I’d like to do this

(let [{:user/keys [id :as user-id]} user
       {:company/keys [id]} company]
[user-id id])

What do user and company look like in this scenario?

Assuming I have your use case right, you could do

(let [{{user-id :id} :user/keys} user
      {{id :id} :company/keys} company]
  [user-id id])

[jim@goliath ~]$ lumo
Lumo 1.8.0
ClojureScript 1.9.946
Node.js v9.2.0
 Docs: (doc function-name-here)
       (find-doc "part-of-name-here")
 Source: (source function-name-here)
 Exit: Control+D or :cljs/quit or exit

cljs.user=> (let [user {:user/keys {:id 56}}
       #_=>       company {:company/keys {:id 28}}
       #_=>       {{user-id :id} :user/keys} user
       #_=> {{id :id} :company/keys} company]
       #_=>   [user-id id])
[56 28]

!