DEV: Replace mini-loader with Ember's `loader.js` library (#18643)

We already have this as a dependency, so it makes sense to use it rather than using our own not-quite-spec-compliant implementation

app/assets/javascripts/mini-loader.js

@@ -1,233 +0,0 @@
-// Used by pretty-text in MiniRacer context
-
-let define, requirejs;
-
-(function () {
-  let JS_MODULES = {};
-
-  let registry = {};
-  let seen = {};
-  let FAILED = false;
-
-  let uuid = 0;
-
-  function tryFinally(tryable, finalizer) {
-    try {
-      return tryable();
-    } finally {
-      finalizer();
-    }
-  }
-
-  function unsupportedModule(length) {
-    throw new Error(
-      "an unsupported module was defined, expected `define(name, deps, module)` instead got: `" +
-        length +
-        "` arguments to define`"
-    );
-  }
-
-  let defaultDeps = ["require", "exports", "module"];
-
-  function Module(name, deps, callback, exports) {
-    this.id = uuid++;
-    this.name = name;
-    this.deps = !deps.length && callback.length ? defaultDeps : deps;
-    this.exports = exports || {};
-    this.callback = callback;
-    this.state = undefined;
-    this._require = undefined;
-  }
-
-  Module.prototype.makeRequire = function () {
-    if (this._require) {
-      return this._require;
-    }
-    this._require = (dep) => {
-      return requirejs(resolve(dep, this.name));
-    };
-    this._require.has = (dep) => {
-      const moduleName = resolve(dep, this.name);
-      return require.has(moduleName);
-    };
-    return this._require;
-  };
-
-  define = function (name, deps, callback) {
-    if (arguments.length < 2) {
-      unsupportedModule(arguments.length);
-    }
-
-    if (!Array.isArray(deps)) {
-      callback = deps;
-      deps = [];
-    }
-
-    registry[name] = new Module(name, deps, callback);
-  };
-
-  // we don't support all of AMD
-  // define.amd = {};
-  // we will support petals...
-  define.petal = {};
-
-  function Alias(path) {
-    this.name = path;
-  }
-
-  define.alias = function (path) {
-    return new Alias(path);
-  };
-
-  function reify(mod, name, rseen) {
-    let deps = mod.deps;
-    let length = deps.length;
-    let reified = new Array(length);
-    let dep;
-    // TODO: new Module
-    // TODO: seen refactor
-    let module = {};
-
-    for (let i = 0, l = length; i < l; i++) {
-      dep = deps[i];
-      if (dep === "exports") {
-        module.exports = reified[i] = rseen;
-      } else if (dep === "require") {
-        reified[i] = mod.makeRequire();
-      } else if (dep === "module") {
-        mod.exports = rseen;
-        module = reified[i] = mod;
-      } else {
-        reified[i] = requireFrom(resolve(dep, name), name);
-      }
-    }
-
-    return {
-      deps: reified,
-      module,
-    };
-  }
-
-  function requireFrom(name, origin) {
-    let mod = JS_MODULES[name] || registry[name];
-
-    if (!mod) {
-      name = name + "/index";
-      mod = registry[name];
-    }
-
-    if (!mod) {
-      throw new Error(
-        "Could not find module `" + name + "` imported from `" + origin + "`"
-      );
-    }
-    return requirejs(name);
-  }
-
-  function missingModule(name) {
-    throw new Error("Could not find module " + name);
-  }
-
-  requirejs = require = function (name) {
-    if (JS_MODULES[name]) {
-      return JS_MODULES[name];
-    }
-
-    let mod = registry[name];
-
-    if (mod && mod.callback instanceof Alias) {
-      mod = registry[mod.callback.name];
-    }
-
-    if (!mod) {
-      name = name + "/index";
-      mod = registry[name];
-    }
-
-    if (!mod) {
-      missingModule(name);
-    }
-
-    if (mod.state !== FAILED && seen.hasOwnProperty(name)) {
-      return seen[name];
-    }
-
-    let reified;
-    let module;
-    let loaded = false;
-
-    seen[name] = {}; // placeholder for run-time cycles
-
-    tryFinally(
-      function () {
-        reified = reify(mod, name, seen[name]);
-        module = mod.callback.apply(this, reified.deps);
-        loaded = true;
-      },
-      function () {
-        if (!loaded) {
-          mod.state = FAILED;
-        }
-      }
-    );
-
-    let obj;
-    if (module === undefined && reified.module.exports) {
-      obj = reified.module.exports;
-    } else {
-      obj = seen[name] = module;
-    }
-
-    if (
-      obj !== null &&
-      (typeof obj === "object" || typeof obj === "function") &&
-      obj["default"] === undefined
-    ) {
-      obj["default"] = obj;
-    }
-
-    return (seen[name] = obj);
-  };
-  window.requireModule = requirejs;
-
-  function resolve(child, name) {
-    if (child.charAt(0) !== ".") {
-      return child;
-    }
-
-    let parts = child.split("/");
-    let nameParts = name.split("/");
-    let parentBase = nameParts.slice(0, -1);
-
-    for (let i = 0, l = parts.length; i < l; i++) {
-      let part = parts[i];
-
-      if (part === "..") {
-        if (parentBase.length === 0) {
-          throw new Error("Cannot access parent module of root");
-        }
-        parentBase.pop();
-      } else if (part === ".") {
-        continue;
-      } else {
-        parentBase.push(part);
-      }
-    }
-
-    return parentBase.join("/");
-  }
-
-  requirejs.entries = requirejs._eak_seen = registry;
-  requirejs.clear = function () {
-    requirejs.entries = requirejs._eak_seen = registry = {};
-    seen = {};
-  };
-  require.has = function (moduleName) {
-    return (
-      Boolean(registry[moduleName]) || Boolean(registry[moduleName + "/index"])
-    );
-  };
-
-  globalThis.define = define;
-  globalThis.require = require;
-})();

lib/discourse_js_processor.rb

@@ -142,7 +142,7 @@ class DiscourseJsProcessor
       JS
 
       # define/require support
-      load_file_in_context(ctx, "mini-loader.js")
+      load_file_in_context(ctx, "node_modules/loader.js/dist/loader/loader.js")
 
       # Babel
       load_file_in_context(ctx, "node_modules/@babel/standalone/babel.js")

lib/freedom_patches/raw_handlebars.rb

@@ -10,7 +10,7 @@ class Barber::Precompiler
 
   def precompiler
     if !@precompiler
-      loader = File.read("#{Rails.root}/app/assets/javascripts/mini-loader.js")
+      loader = File.read("#{Rails.root}/app/assets/javascripts/node_modules/loader.js/dist/loader/loader.js")
       source = File.read("#{Rails.root}/app/assets/javascripts/discourse-common/addon/lib/raw-handlebars.js")
 
       transpiled = DiscourseJsProcessor.transpile(source, "#{Rails.root}/app/assets/javascripts/", "discourse-common/lib/raw-handlebars")

lib/pretty_text.rb

@@ -94,7 +94,7 @@ module PrettyText
     end
 
     root_path = "#{Rails.root}/app/assets/javascripts/"
-    ctx_load(ctx, "#{root_path}/mini-loader.js")
+    ctx_load(ctx, "#{root_path}/node_modules/loader.js/dist/loader/loader.js")
     ctx_load(ctx, "#{root_path}/handlebars-shim.js")
     ctx_load(ctx, "#{root_path}/node_modules/xss/dist/xss.js")
     ctx.load("#{Rails.root}/lib/pretty_text/vendor-shims.js")