I can verify that after cleaning the source and upgrading to 0.5.13 of figwheel that it all seems to work.

dang. I can’t install lein-nrepl because my team uses lein-cooper: https://github.com/clojure-emacs/cider-nrepl/issues/404

ok, I guess I disable that locally. hum.

is it possible to store a function in an atom? i'm trying to pass a function up from a child to its parent

yes, but you should just be able to return a function from the child to the parent

there's also promises (if the value only needs to be set once)

i'm not sure i follow. where would i return the function? (this is in the context of React)

oh I'm sorry, I misread

no worries! also what i was doing just started working 🙂

must have been a browser cache issue

thanks for the help!

what do you guys use to serve clojurescript apps?

@roklenarcic often just S3/Cloudfront/Route53

using leinigen how do I pass build profile id to code? Like if the code was compiled using release build it should do X, else Y

@roklenarcic you can use something like closure defines or a macro that reaches into environment variables. The CLJS compiler doesn’t really know about Leiningen/Boot profiles/configurations

@roklenarcic here’s a guide for using :closure-defines https://www.martinklepsch.org/posts/parameterizing-clojurescript-builds.html

I think this should do it

thx

I have a CLJS compile problem with a macro I'm trying to write:

(defmacro tm1 [xp]
   (walk/postwalk
     (fn [x#]
       (if (seqable? x#)
         `(~(if (vector? x#) vector list) ~@x#)
         x#
         ))
     xp))

(tm1 [:a [1 2 3] (:x)])

failed compiling constant: clojure.core$vector@54e8f10a; class clojure.core$vector is not a valid ClojureScript constant. {:constant #object[clojure.core$vector 0x54e8f10a "clojure.core$vector@54e8f10a"], :type clojure.core$vector}

but if I write

(defmacro tm1 [xp]
   (walk/postwalk
     (fn [x#]
       (if (seqable? x#)
         `(vector ~@x#)
         x#
         ))
     xp))

@octo221 The vector in the first example is within an evaluated environment. (ie: tilde ~). You should add a backtick to the vector and list

@rauh that's it! thanks - but why did the same macro work in a Clojure REPL without the backticks ?

@octo221 Just a coincident, it wouldn't work in some other case, like AOT

@rauh ahah now I see why: the first one returned unquoted vector and list, which were evaluated because they were in a ~, which means they returned the function objects they referred to, and it happens that in a Clojure REPL you can evaluate an expression like (#object[...] 1 2 3) (presumably the object returns itself)

@octo221 also you don't need the trailing # on your variable unless it is part of the resulting expansion

@bhauman oh you mean only if your macro returns something like (let [x# 5] (inc x#) ?

yes 🙂

got it - thanks!

if you expand the macro output you will see that the x# emits a unique variable name

is that what's meant by 'hygienic' ?

this is a strategy to be hygienic, yes

and the # is the same as gensym right ?

@octo221 mostly. Manually gensym'd symbols have the benefit of surviving multiple quote-unquotes

@octo221 it is helpful think of it that way, but there is more to it

say I wanted to generate a let binding of a million symbols (let [a# 0 ... z# 25] ...) i'd use gensym to make them all ?

that could help, you would have to track them, and use them where appropriate

this is my third macro. The first two I wrote 5 years ago - haven't needed one all that time

i don't think i understood them at all back then, I got there by trial and error

hey i used gensym!

(defmacro m2 [] (let [s (repeatedly 7 gensym)] `(let ~(vec (mapcat vector s (range))) (+ ~@s))))

(m2)

21

anyway back to work - thanks for all the help!

Does anyone know why this won't work?

(:refer-clojure :rename {clj->js cljs->js})

I am using this in a cljc file where I want to define this:

#?(:clj (def clj->js identity)
   :cljs (def clj->js cljs->js))

very cool stuff you can do nowadays, I wanted to thank the cljs contributors for this:

(ns cljs-lambda.js-build
  (:require "os" "fs" "path" "archiver"))

I am attempting to use the [email protected] module, it seems that it is not indexed under bootstrap by cljs.closure/handle-js-modules. It is, however, indexed under bootstrap/dist/js/bootstrap, but when I try to (require ["bootstrap/dist/js/bootstrap"]), I get a Assert failed: cljs.analyzer/foreign-dep? expected symbol got "bootstrap/dist/js/bootstrap" error. I have tried various other paths (e.g. "bootstrap/js/modal") with both 1.9.908 and master with the same result. Does anyone know how this can be resolved?

given the newest release of clojurescript, i should be able to include d3 from npm and use it like a goog module, something like (d3/scale some-args), right? or are we still using js interop syntax?

Is anyone using spec with clojurescript? My main question would be, how do you spec functions that are expecting react atoms or cursors as parameter?

(I've meant reagent atoms and cursor, sorry)

@symfrog I think bootstrap is going to be a bit problematic since it just adds things to jQuery

it doesn’t really export anything itself

Is there a modern CSS library for CLJS? Or are Forest and Garden still the go-tos?

@erichmond I use Garden

@symfrog I can repro, looking into it

so the first thing might be a bug

for the 2nd thing looks like Closure can’t process that file (maybe because of the IIFE)

@symfrog https://dev.clojure.org/jira/browse/CLJS-2326

I’ll get to it later

@anmonteiro great, thanks!

@octo221 thanks!

I'm wondering if there is a CLJS convenience library to help with ES6 class semantics, especially extension, given that this is going to be the only path for defining React lifecycle components without a React wrapper.

its mainly the constructor juggling that becomes a bit unwieldy

@bhauman it still can be done via JS prototypes though. I guess an example of this is in Reagent or Sablono sources

yes, thanks, I'm aware of that

I'm just thinking about how this is going to be something people encounter earlyish because FB says use ES6 classes to do React and while we can do this, it's not particularly fun. But we do have some awesome React wrappers.

I've spent the day trying to fix the loss of React.createClass in Devcards

Well, createClass thing lives in its own package now create-react-class or something, which I believe is already on CLJSJS

yes, but for how long... and its not reliably backwards compatible to React 14 like extending React.Component is

I agree that a utility lib would be helpful here, but I'm unfortunately not aware of any

@bhauman I’m sure goog.object has a bunch of useful stuff

so what would your ideal CLJS ES6 class syntax look like? Would it be something in this ballpark?

(defclass home-page Component
  {:constructor (fn [] ,,,)
   :render (fn [] ,,,)})

@rgdelato that looks reasonable, it would also be interesting to explore a function that adds a constructor to extend-type

perhaps the above is more idomatic

maybe a primitive can help with that if we use extend-type?

nah extend type isn't going to help

probably would want to break this down into class and defclass would just name it.

actually I've written all the code for this already