raymcdermott

Introduction

A conversation started at the Heart of Clojure conference in Belgium on Friday August 2nd 2019.

The group represented project owners from Maria.Cloud, Next.Journal, Klipse and Replete-Web. The projects make significant use of self-hosted CLJS.

This is a proposal to have a service that generates and caches JS files for a specific CLJS dependency (name & version).

Background

The ClojureScript compiler generates JS files for each of an apps stated CLJS dependencies. The runtime environment then loads each of the needed JS files to satisfy the dependency at runtime.

mfikes

This page logs work being done under Clojurists Together Q2 2018 Funding Round towards the ClojureScript project. High level progress reports will be published formally with Clojurists Together, but you can follow here if you are interested in low-level details, progress notes, etc.

Themes

The concrete themes identified include:

• Fixing CLJS-2702, which prevents us from upgrading to newer versions of Closure Library.
• Work on highly voted ClojureScript tickets. Please take some time and vote in this list of tickets in need of patches.
• Work on issues related to NPM dependency management. (In particular NPM issues in the list above will be given extra emphasis).

vvvvalvalval

;; # EMULATING DATOMIC EXCISION VIA MANUAL DATA MIGRATION


;; *************************************
;; ## Introduction
;; *************************************

;; This Gist demonstrates a generic way to migrate an entire Datomic database
;; from an existing 'Origin Connection' to a clean 'Destination Connection',
;; while getting rid of some undesirable data and otherwise preserving history.

bhauman

(ns figwheel.simple
  (:require
   [clojure.string :as string]
   #?@(:cljs [[goog.object :as gobj]])
   #?@(:clj [[clojure.walk :as walk]
             [cljs.repl.browser :as brow]
             [cljs.repl :as repl]
             [cljs.env :as env]
             [cljs.analyzer :as ana]
             [cljs.build.api :as bapi]

robert-stuttaford

(require '[cljs.build.api :as api]
         '[clojure.string :as string]
         '[figwheel-sidecar.repl-api :as figwheel]
         '[figwheel-sidecar.components.nrepl-server :as figwheel.nrepl])

(def source-dir "src")

(def compiler-config
  {:main          'app.main
   :output-to     "target/app.js"

swannodette

Code Splitting

NOTE: This gist uses the master branch of ClojureScript. Clone ClojureScript and from the checkout run ./script/bootstrap and ./script/uberjar. This will produce target/cljs.jar which you can use to follow this guide.

As client applications become larger it becomes desirable to load only the code actually required to run a particular logical screen. Previously ClojureScript :modules compiler option permitted such code splitting, but this feature only worked under :advanced compilation and users would still have to manage loading these splits. :modules also required manual

myrho

Lightning Talk proposal for ReactiveConf 2017 http://www.reactiveconf.com #ReactiveConf

Porting Prezi to Elm in 99 lines of code

Elm is a statically-typed functional programming language. Its compiler produces safe JavaScript which is guaranteed to be free of runtime exceptions. Moreover Elm is packed with a bunch of powerful abstractions which let us build visual and reactive Web applications in a few lines of code.

As an example, I show the implementation of a simple framework for building Prezi-like presentations. It's just 99 lines of code!

swannodette

Externs Inference

Integrating third party JavaScript libraries not written with Google Closure Compiler in mind continues to both be a source of error for users when going to production, and significant vigilance and effort for the the broader community (CLJSJS libraries must provide up-to-date and accurate externs).

In truth writing externs is far simpler than most users imagine. You only need externs for the parts of the library you actually intend to use from ClojureScript. However this isn't so easy to determine from Closure's own documentation. Still in the process of writing your code it's easy to miss a case. In production you will see the much dreaded error that some mangled name does not exist. Fortunately it's possible to enable some compiler flags :pretty-print true :pseudo-names true to generate an advanced build with human readable names. However debugging missing externs means compiling your production build for each missed case. So much time wasted for such simple mistakes damages our sen

mk

defmodule Mischer do
  def deck do
    suits = ["s","h","g","e"]
    ranks = ["7","8","9","X","U","O","K","A"]
    for rank <- ranks, suit <- suits, do: rank <> suit
  end

  def shuffle(cards \\ deck) do
    card_count = Enum.count(cards)
    Enum.reduce 0..(card_count - 1), cards, fn(i, shuffled_cards) ->

mgold

Using Mailboxes in Elm

Max Goldstein | July 30, 2015 | Elm 0.15.1

In Elm, signals always have a data source associated with them. Window.dimensions is exactly what you think it is, and you can't send your own events on it. You can derive your own signals from these primitives using map, filter, and merge, but the timing of events is beyond your control.

This becomes a problem when you try to add UI elements. We want to be able to add checkboxes and dropdown menus, and to receive the current state of these elements as a signal. So how do we do that?

The Bad Old Days