javascript - Having another class as a static property on a class -

read example below*, don't pay attention eventemitter inheritance, please – shows utility of class syntax.

i realize example not correct es2015, since there no such thing static class statement.

what syntactically lean way make work in es2015?

class app extends eventemitter {   addpage(name) {     this[name] = new app.page;     this.emit("page-added");   }    static class page extends eventemitter {     constructor() {       super();       this._paragraphs = [];     }      addparagraph(text) {       this._paragraphs.push(text);       this.emit("paragraph-added");     }   } } 

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should split , use class expression, below? seems less elegant.

class app extends eventemitter {   addpage(name) {     this[name] = new app.page;     this.emit("page-added");   } }  app.page = class extends eventemitter {   constructor() {     super();     this._paragraphs = [];   }    addparagraph(text) {     this._paragraphs.push(text);     this.emit("paragraph-added");   } }; 

should split , use class expression?

yes, that's way go. if insist on using declaration, you'd have make app.page = page assignment afterwards.