DEV: Add jquery-free `decorateCookedElement` function to plugin api (#9534)

This is a replacement for `decorateCooked` which will work without jquery.

A backwards compatibility layer is provided for existing plugins/themes which are currently using `decorateCooked`

app/assets/javascripts/discourse/app/components/composer-editor.js

@@ -1019,7 +1019,7 @@ export default Component.extend({
 
       this._registerImageScaleButtonClick($preview);
 
-      this.trigger("previewRefreshed", $preview);
+      this.trigger("previewRefreshed", $preview[0]);
       this.afterRefresh($preview);
     }
   }

app/assets/javascripts/discourse/app/lib/lazy-load-images.js

@@ -84,8 +84,8 @@ function show(image) {
   }
 }
 
-function forEachImage($post, callback) {
-  $post[0].querySelectorAll("img").forEach(img => {
+function forEachImage(post, callback) {
+  post.querySelectorAll("img").forEach(img => {
     if (img.width >= MINIMUM_SIZE && img.height >= MINIMUM_SIZE) {
       callback(img);
     }
@@ -104,7 +104,7 @@ export function setupLazyLoading(api) {
     });
   }, OBSERVER_OPTIONS);
 
-  api.decorateCooked($post => forEachImage($post, img => hide(img)), {
+  api.decorateCookedElement(post => forEachImage(post, img => hide(img)), {
     onlyStream: true,
     id: "discourse-lazy-load"
   });
@@ -112,8 +112,8 @@ export function setupLazyLoading(api) {
   // IntersectionObserver.observe must be called after the cooked
   // content is adopted by the document element in chrome
   // https://bugs.chromium.org/p/chromium/issues/detail?id=1073469
-  api.decorateCooked(
-    $post => forEachImage($post, img => observer.observe(img)),
+  api.decorateCookedElement(
+    post => forEachImage(post, img => observer.observe(img)),
     {
       onlyStream: true,
       id: "discourse-lazy-load-after-adopt",

app/assets/javascripts/discourse/app/lib/plugin-api.js

@@ -54,7 +54,7 @@ import { on } from "@ember/object/evented";
 import KeyboardShortcuts from "discourse/lib/keyboard-shortcuts";
 
 // If you add any methods to the API ensure you bump up this number
-const PLUGIN_API_VERSION = "0.8.41";
+const PLUGIN_API_VERSION = "0.8.42";
 
 class PluginApi {
   constructor(version, container) {
@@ -192,10 +192,23 @@ class PluginApi {
   }
 
   /**
-   * Used for decorating the `cooked` content of a post after it is rendered using
-   * jQuery.
+   * Method for decorating the `cooked` content of a post using JQuery
    *
-   * `callback` will be called when it is time to decorate with a jQuery selector.
+   * You should use decorateCookedElement instead, which works without JQuery
+   *
+   * This method will be deprecated in future
+   **/
+  decorateCooked(callback, opts) {
+    this.decorateCookedElement(
+      (element, decoratorHelper) => callback($(element), decoratorHelper),
+      opts
+    );
+  }
+
+  /**
+   * Used for decorating the `cooked` content of a post after it is rendered
+   *
+   * `callback` will be called when it is time to decorate with an DOM node.
    *
    * Use `options.onlyStream` if you only want to decorate posts within a topic,
    * and not in other places like the user stream.
@@ -206,8 +219,8 @@ class PluginApi {
    * For example, to add a yellow background to all posts you could do this:
    *
    * ```
-   * api.decorateCooked(
-   *   $elem => $elem.css({ backgroundColor: 'yellow' }),
+   * api.decorateCookedElement(
+   *   elem => { elem.style.backgroundColor = 'yellow' },
    *   { id: 'yellow-decorator' }
    * );
    * ```
@@ -215,7 +228,7 @@ class PluginApi {
    * NOTE: To avoid memory leaks, it is highly recommended to pass a unique `id` parameter.
    * You will receive a warning if you do not.
    **/
-  decorateCooked(callback, opts) {
+  decorateCookedElement(callback, opts) {
     opts = opts || {};
 
     addDecorator(callback, { afterAdopt: !!opts.afterAdopt });
@@ -1114,10 +1127,10 @@ function decorate(klass, evt, cb, id) {
   }
 
   const mixin = {};
-  mixin["_decorate_" + _decorateId++] = on(evt, function($elem) {
-    $elem = $elem || $(this.element);
-    if ($elem) {
-      cb($elem);
+  mixin["_decorate_" + _decorateId++] = on(evt, function(elem) {
+    elem = elem || this.element;
+    if (elem) {
+      cb(elem);
     }
   });
   klass.reopen(mixin);

app/assets/javascripts/discourse/app/widgets/post-cooked.js

@@ -11,7 +11,7 @@ import {
 let _beforeAdoptDecorators = [];
 let _afterAdoptDecorators = [];
 
-// Don't call this directly: use `plugin-api/decorateCooked`
+// Don't call this directly: use `plugin-api/decorateCookedElement`
 export function addDecorator(callback, { afterAdopt = false } = {}) {
   if (afterAdopt) {
     _afterAdoptDecorators.push(callback);
@@ -67,13 +67,11 @@ export default class PostCooked {
   }
 
   _decorateAndAdopt(cooked) {
-    const $cooked = $(cooked);
-
-    _beforeAdoptDecorators.forEach(d => d($cooked, this.decoratorHelper));
+    _beforeAdoptDecorators.forEach(d => d(cooked, this.decoratorHelper));
 
     document.adoptNode(cooked);
 
-    _afterAdoptDecorators.forEach(d => d($cooked, this.decoratorHelper));
+    _afterAdoptDecorators.forEach(d => d(cooked, this.decoratorHelper));
   }
 
   _applySearchHighlight($html) {