Deraen

(def start (atom nil))

(def log (atom []))

(defn latency-test []
  (let [a (r/atom 0)]
    (fn []
      (let [[b update-b] (react/useState 0)]
        (react/useEffect
          (fn []

Deraen

alias: TV valot
description: ""
trigger:
  - platform: state
    entity_id:
      - media_player.tv
    not_to:
      - unknown
    for:
      seconds: 5

Deraen

(ns app.dev.shadow
  (:require [shadow.cljs.devtools.api :as shadow]
            [clojure.edn :as edn]))

;; Run this with:
;; npx shadow-cljs clj-run app.dev.shadow/watch

(set! *warn-on-reflection* true)

(defn watch

Deraen

var vm = require("vm");
var fs = require("fs");

function nodeGlobalRequire(file) {
    var _module  = global.module,
        _exports = global.exports,
        exportedRequire = false;

    // to circumvent Node.js environment detection in bundled libraries
    global.module = undefined;

Deraen

Merge with map literal

(merge a {:a 1 :b 2}) -> (assoc a :a 1 :b2)

(-> foo (merge {:foo :bar}) -> (-> foo (assoc :foo :bar))

Reasoning:

• Performance
• Easier to read?

Deraen

(ns example.react-konva-image
  (:require [reagent.core :as r]
            ;; This presumes Shadow-cljs (or cljsjs packages with correct definitions)
            [react-konva :refer [Stage Layer Image]]
            [use-image :as use-image]))

(defn lion-image []
  (let [[image] (use-image "https://konvajs.org/assets/lion.png")]
    (r/as-element [:> Image {:image image}])))
;; or, without Reagent hiccup -> React elements step, directly creating React element:

Deraen

(defn router-component [match]
  (let [[view-component & nested-view-components] (:views match)]
    (if view-component
      [view-component (assoc match :views nested-view-components)])))

(defn topics-view [match]
  [:div
   [:div "List of topics..."]
   ;; Nested router, renders nothing or topic-view if in :topic

Deraen

Reagent uses async rendering model. Reagent uses browsers requestAnimationFrame to schedule render calls: https://reagent-project.github.io/news/reagent-is-async.html

Uncontrolled input

[:input {:default-value "foo" :on-change #(js/console.log (.. % -target -value))}]

Uncontroller input is an input which value is not updated by Reagent/React if the value set in the code changes. After initial render, the value is only changed by users interactions.

Deraen

Problem

Currently libraries need to write some logic to load JS libraries from various places. For example Reagent supports:

1. (Default) Cljsjs packages which export js/React, js/ReactDOM, js/ReactDOMServer and js/createReactClass
2. Npm packages, with require when using Node target

Because the default is Cljsjs, Reagent namespaces depend on cljsjs namespaces like cljsjs.react. This means that to use Reagent with option 2. requires creating empty stub namespaces that provides these.

Deraen

1. One process for building Cljs and pushing resulting jar somewhere
   • Maybe travis build artifacts? https://docs.travis-ci.com/user/uploading-artifacts/
2. Process for each OS project for running tests against the jar
3. One repo to save the build results

Builds can be triggered (in addition to commits to the repo), by Travis cron daily, or with HTTP endpoint called by other builds, in other projects: https://docs.travis-ci.com/user/triggering-builds/

clojure/clojurescript would trigger process (cljs-oss/clojurescript) to build the new jar file.