REFACTOR: Remove `_.merge`

app/assets/javascripts/discourse-common/addon/lib/object.js

@@ -0,0 +1,37 @@
+// a fairly simple deep merge based on: https://gist.github.com/ahtcx/0cd94e62691f539160b32ecda18af3d6
+export function merge(...objects) {
+  const isObject = obj => obj && typeof obj === "object";
+
+  function deepMergeInner(target, source) {
+    Object.keys(source).forEach(key => {
+      const targetValue = target[key];
+      const sourceValue = source[key];
+
+      if (Array.isArray(targetValue) && Array.isArray(sourceValue)) {
+        target[key] = targetValue.concat(sourceValue);
+      } else if (isObject(targetValue) && isObject(sourceValue)) {
+        target[key] = deepMergeInner(
+          Object.assign({}, targetValue),
+          sourceValue
+        );
+      } else {
+        target[key] = sourceValue;
+      }
+    });
+
+    return target;
+  }
+
+  if (objects.some(object => object && !isObject(object))) {
+    throw new Error('deepMerge: all values should be of type "object"');
+  }
+
+  const target = objects.shift();
+  let source;
+
+  while ((source = objects.shift())) {
+    deepMergeInner(target, source || {});
+  }
+
+  return target;
+}

app/assets/javascripts/discourse/app/controllers/topic.js

@@ -26,6 +26,7 @@ import { escapeExpression } from "discourse/lib/utilities";
 import { AUTO_DELETE_PREFERENCES } from "discourse/models/bookmark";
 import { inject as service } from "@ember/service";
 import bootbox from "bootbox";
+import { merge } from "discourse-common/lib/object";
 
 let customPostMessageCallbacks = {};
 
@@ -249,7 +250,7 @@ export default Controller.extend(bufferedProperty("model"), {
     this.set("loadingPostIds", true);
 
     return ajax(url, {
-      data: _.merge(
+      data: merge(
         { post_number: post.get("post_number") },
         postStream.get("streamFilters")
       )

app/assets/javascripts/discourse/app/lib/search.js

@@ -13,6 +13,7 @@ import User from "discourse/models/user";
 import Post from "discourse/models/post";
 import Topic from "discourse/models/topic";
 import { escapeExpression } from "discourse/lib/utilities";
+import { merge } from "discourse-common/lib/object";
 
 export function translateResults(results, opts) {
   opts = opts || {};
@@ -206,7 +207,7 @@ export function applySearchAutocomplete(
   };
 
   $input.autocomplete(
-    _.merge(
+    merge(
       {
         template: findRawTemplate("category-tag-autocomplete"),
         key: "#",
@@ -226,7 +227,7 @@ export function applySearchAutocomplete(
 
   if (siteSettings.enable_mentions) {
     $input.autocomplete(
-      _.merge(
+      merge(
         {
           template: findRawTemplate("user-selector-autocomplete"),
           key: "@",

app/assets/javascripts/discourse/app/lib/utilities.js

@@ -4,6 +4,7 @@ import toMarkdown from "discourse/lib/to-markdown";
 import Handlebars from "handlebars";
 import { default as getURL, getURLWithCDN } from "discourse-common/lib/get-url";
 import { helperContext } from "discourse-common/lib/helpers";
+import { merge } from "discourse-common/lib/object";
 
 let _defaultHomepage;
 
@@ -85,7 +86,7 @@ export function avatarImg(options, customGetURL) {
 
 export function tinyAvatar(avatarTemplate, options) {
   return avatarImg(
-    _.merge({ avatarTemplate: avatarTemplate, size: "tiny" }, options)
+    merge({ avatarTemplate: avatarTemplate, size: "tiny" }, options)
   );
 }
 

app/assets/javascripts/discourse/app/mixins/upload.js

@@ -8,6 +8,7 @@ import getUrl from "discourse-common/lib/get-url";
 import { on } from "@ember/object/evented";
 import Mixin from "@ember/object/mixin";
 import bootbox from "bootbox";
+import { merge } from "discourse-common/lib/object";
 
 export default Mixin.create({
   uploading: false,
@@ -56,7 +57,7 @@ export default Mixin.create({
     });
 
     $upload.fileupload(
-      _.merge(
+      merge(
         {
           url: this.calculateUploadUrl(),
           dataType: "json",
@@ -82,7 +83,7 @@ export default Mixin.create({
     });
 
     $upload.on("fileuploadsubmit", (e, data) => {
-      const opts = _.merge(
+      const opts = merge(
         {
           bypassNewUserRestriction: true,
           user: this.currentUser,

app/assets/javascripts/discourse/app/models/nav-item.js

@@ -9,6 +9,7 @@ import deprecated from "discourse-common/lib/deprecated";
 import Site from "discourse/models/site";
 import User from "discourse/models/user";
 import { getOwner } from "discourse-common/lib/get-owner";
+import { merge } from "discourse-common/lib/object";
 
 const NavItem = EmberObject.extend({
   @discourseComputed("name")
@@ -180,7 +181,7 @@ NavItem.reopenClass({
       args.noSubcategories = true;
     }
     NavItem.extraArgsCallbacks.forEach(cb =>
-      _.merge(args, cb.call(this, filterType, opts))
+      merge(args, cb.call(this, filterType, opts))
     );
 
     let store = getOwner(this).lookup("service:store");
@@ -222,7 +223,7 @@ NavItem.reopenClass({
     };
 
     const extraItems = NavItem.extraNavItemDescriptors
-      .map(descriptor => ExtraNavItem.create(_.merge({}, context, descriptor)))
+      .map(descriptor => ExtraNavItem.create(merge({}, context, descriptor)))
       .filter(item => {
         if (!item.customFilter) return true;
         return item.customFilter(category, args);

app/assets/javascripts/discourse/app/models/post-stream.js

@@ -10,6 +10,7 @@ import discourseComputed from "discourse-common/utils/decorators";
 import { loadTopicView } from "discourse/models/topic";
 import { Promise } from "rsvp";
 import User from "discourse/models/user";
+import { merge } from "discourse-common/lib/object";
 
 export default RestModel.extend({
   _identityMap: null,
@@ -274,7 +275,7 @@ export default RestModel.extend({
     this.set("loadingFilter", true);
     this.set("loadingNearPost", opts.nearPost);
 
-    opts = _.merge(opts, this.streamFilters);
+    opts = merge(opts, this.streamFilters);
 
     // Request a topicView
     return loadTopicView(topic, opts)
@@ -943,7 +944,7 @@ export default RestModel.extend({
       include_suggested: includeSuggested
     };
 
-    data = _.merge(data, this.streamFilters);
+    data = merge(data, this.streamFilters);
     const store = this.store;
 
     return ajax(url, { data }).then(result => {

app/assets/javascripts/discourse/app/models/topic.js

@@ -23,9 +23,10 @@ import { Promise } from "rsvp";
 import Site from "discourse/models/site";
 import User from "discourse/models/user";
 import bootbox from "bootbox";
+import { merge } from "discourse-common/lib/object";
 
 export function loadTopicView(topic, args) {
-  const data = _.merge({}, args);
+  const data = merge({}, args);
   const url = `${getURL("/t/")}${topic.id}`;
   const jsonUrl = (data.nearPost ? `${url}/${data.nearPost}` : url) + ".json";
 

app/assets/javascripts/discourse/app/routes/invites-show.js

@@ -1,6 +1,7 @@
 import I18n from "I18n";
 import DiscourseRoute from "discourse/routes/discourse";
 import PreloadStore from "discourse/lib/preload-store";
+import { merge } from "discourse-common/lib/object";
 
 export default DiscourseRoute.extend({
   titleToken() {
@@ -10,7 +11,7 @@ export default DiscourseRoute.extend({
   model(params) {
     if (PreloadStore.get("invite_info")) {
       return PreloadStore.getAndRemove("invite_info").then(json =>
-        _.merge(params, json)
+        merge(params, json)
       );
     } else {
       return {};

app/assets/javascripts/discourse/app/routes/password-reset.js

@@ -3,6 +3,7 @@ import DiscourseRoute from "discourse/routes/discourse";
 import PreloadStore from "discourse/lib/preload-store";
 import { ajax } from "discourse/lib/ajax";
 import { userPath } from "discourse/lib/url";
+import { merge } from "discourse-common/lib/object";
 
 export default DiscourseRoute.extend({
   titleToken() {
@@ -12,7 +13,7 @@ export default DiscourseRoute.extend({
   model(params) {
     if (PreloadStore.get("password_reset")) {
       return PreloadStore.getAndRemove("password_reset").then(json =>
-        _.merge(params, json)
+        merge(params, json)
       );
     }
   },

app/assets/javascripts/discourse/app/widgets/topic-timeline.js

@@ -8,6 +8,7 @@ import { iconNode } from "discourse-common/lib/icon-library";
 import RawHtml from "discourse/widgets/raw-html";
 import renderTags from "discourse/lib/render-tags";
 import renderTopicFeaturedLink from "discourse/lib/render-topic-featured-link";
+import { merge } from "discourse-common/lib/object";
 
 const SCROLLER_HEIGHT = 50;
 const LAST_READ_HEIGHT = 20;
@@ -240,7 +241,7 @@ createWidget("timeline-scrollarea", {
       this.attach("timeline-padding", { height: before }),
       this.attach(
         "timeline-scroller",
-        _.merge(position, {
+        merge(position, {
           showDockedButton: !attrs.mobileView && hasBackPosition && !showButton,
           fullScreen: attrs.fullScreen
         })

app/assets/javascripts/discourse/app/widgets/widget.js

@@ -22,6 +22,7 @@ import DecoratorHelper from "discourse/widgets/decorator-helper";
 import { Promise } from "rsvp";
 import { isProduction } from "discourse-common/config/environment";
 import { get } from "@ember/object";
+import { merge } from "discourse-common/lib/object";
 
 const _registry = {};
 
@@ -185,7 +186,7 @@ export default class Widget {
 
     // Sometimes we pass state down from the parent
     if (this.mergeState) {
-      this.state = _.merge(this.state, this.mergeState);
+      this.state = merge(this.state, this.mergeState);
     }
 
     if (prev) {

app/assets/javascripts/pretty-text/addon/pretty-text.js

@@ -2,6 +2,7 @@ import {
   cook as cookIt,
   setup as setupIt
 } from "pretty-text/engines/discourse-markdown-it";
+import { merge } from "discourse-common/lib/object";
 
 export function registerOption() {
   // TODO next major version deprecate this
@@ -48,7 +49,7 @@ export function buildOptions(state) {
   };
 
   if (state.features) {
-    features = _.merge(features, state.features);
+    features = merge(features, state.features);
   }
 
   const options = {

lib/pretty_text.rb

@@ -87,6 +87,7 @@ module PrettyText
     root_path = "#{Rails.root}/app/assets/javascripts/"
 
     apply_es6_file(ctx, root_path, "discourse-common/addon/lib/get-url")
+    apply_es6_file(ctx, root_path, "discourse-common/addon/lib/object")
     apply_es6_file(ctx, root_path, "discourse/app/lib/to-markdown")
     apply_es6_file(ctx, root_path, "discourse/app/lib/utilities")
 

test/javascripts/lib/pretty-text-test.js

@@ -8,6 +8,7 @@ import {
 } from "pretty-text/inline-oneboxer";
 import { extractDataAttribute } from "pretty-text/engines/discourse-markdown-it";
 import { registerEmoji } from "pretty-text/emoji";
+import { merge } from "discourse-common/lib/object";
 
 QUnit.module("lib:pretty-text");
 
@@ -38,7 +39,7 @@ QUnit.assert.cooked = function(input, expected, message) {
 };
 
 QUnit.assert.cookedOptions = function(input, opts, expected, message) {
-  const merged = _.merge({}, rawOpts, opts);
+  const merged = merge({}, rawOpts, opts);
   const actual = new PrettyText(buildOptions(merged)).cook(input);
   this.pushResult({
     result: actual === expected,

test/javascripts/models/post-test.js

@@ -1,11 +1,12 @@
 import Post from "discourse/models/post";
 import User from "discourse/models/user";
+import { merge } from "discourse-common/lib/object";
 
 QUnit.module("model: Post");
 
 var buildPost = function(args) {
   return Post.create(
-    _.merge(
+    merge(
       {
         id: 1,
         can_delete: true,