fix: simplify source code (#52)

Author: gr2m

index.js

@@ -1,32 +1,26 @@
 export class Base {
   constructor(options = {}) {
     this.options = options;
-    // apply plugins
-    // https://stackoverflow.com/a/16345172
-    const classConstructor = this.constructor;
-    classConstructor.plugins.forEach((plugin) => {
+    this.constructor.plugins.forEach((plugin) => {
       Object.assign(this, plugin(this, options));
     });
   }
-  static plugin(plugin1, ...additionalPlugins) {
-    var _a;
+
+  static plugin(...newPlugins) {
     const currentPlugins = this.plugins;
-    let newPlugins = [plugin1, ...additionalPlugins];
-    const BaseWithPlugins =
-      ((_a = class extends this {}),
-      (_a.plugins = currentPlugins.concat(
+    return class extends this {
+      static plugins = currentPlugins.concat(
         newPlugins.filter((plugin) => !currentPlugins.includes(plugin))
-      )),
-      _a);
-    return BaseWithPlugins;
+      );
+    };
   }
   static defaults(defaults) {
-    const BaseWitDefaults = class extends this {
+    return class extends this {
       constructor(...args) {
         super(Object.assign({}, defaults, args[0] || {}));
       }
     };
-    return BaseWitDefaults;
   }
+
+  static plugins = [];
 }
-Base.plugins = [];