class 18 error 10 inheritance 10 extend 10 prototype 8 custom 6 subclassing 6 javascript 5 mixin 4 oop 4 nodejs 4 extends 4 native 4 es6 4 create 4 stack 4 matched 3 extension 3 promise 3 matches 3 match 3 selectors 3 subclasses 3 styling 3 errors 3 object 3 array 3 styles 3 style 3 placeholder 3 placehold 3 selector 3 chaining 3 css 3 postcss-plugin 3 utilities 3 utility 3 utils 3 util 3 detect 3 feature 3 es2015 3 node 3 inherit 3 cli 3 issupported 3 hasclass 3 has 3 support 3 postcss 3 apostrophe 2 module 2 instanceof 2 typescript 2 final 2 loader 2 abstract 2 static 2 superclass 2 node-js 2 prototypal 2 stdutil 2 class-js 2 class.js 2 sub-class 2 stdutils 2 extending 2 factory 2 stdlib 2 exception 2 stack-traces 2 npm-package 2 decorate 1 decorator 1 expressjs 1 extendable 1 statics 1 basic 1 ES6 1 simple 1 express 1 engine 1 view 1 interface 1 programming 1 expect 1 jest 1 tslint-rules 1 function 1 jsdoc-tags 1 decorators 1 tslint 1 keyword 1 override 1 name 1 arity 1 length 1 instance 1 base 1 progress 1