ES6 classes, with parent in different file, and node.js?
What is the right way to use a class defined in one file and extend it another, in node.js?
Currently I have:
'use strict'
class BasePageHandler {
constructor(app, settings, context) {
}
}
return module.exports;
In the ‘child’ class file I have:
'use strict'
var BasePageHandler = require ('./../BasePageHandler.js');
class FrontpagePageHandler extends BasePageHandler {
constructor(app, settings, context) {
super(app, settings, context);
this.settings = settings;
this.context = context;
}
}
This fails with the following error:
TypeError: Class extends value #<Object> is not a function or null
Note, if I have the BasePageHandler in the same file then it works, so it is really when the class is in another file I have an issue.
Currently using node 4.4.0.
You need to correctly export your class inBasePageHandler.js file:
module.exports = BasePageHandler;
The accepted answer is technically fine, but really if you’re using ES6 then you should go all in and use ES6 export/import.
/*jshint esversion: 6 */
class BasePageHandler {
constructor(app, settings, context) {
}
}
export default BasePageHandler;
and then:
/*jshint esversion: 6 */
import BasePageHandler from './../BasePageHandler.js';
class FrontpagePageHandler extends BasePageHandler {
constructor(app, settings, context) {
super(app, settings, context);
this.settings = settings;
this.context = context;
}
}
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