Develop Reference

Why is jsfiddle saying the reference is undefined

I'm quite new to javascript and jsfiddle. I've been able to toy around with other fiddles that I find, but setting one up myself has proved difficult.
I'm attempting to use a library from npm to get a proof of concept for how it might work. I'm not sure why my import of the module is not working with jsfiddle.
What am I missing to get my fiddle working?
used the resourced bar to import the unpkg script
https://unpkg.com/browse/json-query#2.2.2/index.js
tried using the method outlined in the package readme
var json = [...]
jsonQuery('[DisplayText]', json)

When I follow the unpkg link I see that it has requires such as:
var State = require('./lib/state')
The problem is not only can the browser not understand require, it doesn't have files like ./lib/state available.
I think the problem here is that you are trying to download the raw source, which needs to be built with something like webpack before it can be used in the browser.

Node.js source code of require() function

According to the document (https://nodejs.org/api/globals.html), require() function is one of the global objects/functions. But I'm having a hard time finding its source code on Github. Are they written in JS or C++? I was looking for them in https://github.com/nodejs/node project.

This seems to be it (in node/lib/internal/modules/cjs/helpers.js).

To answer my own question, I think it's defined in loader.js. And you can see it's implemented for all modules.
It seems to be mapped to global.require in node.js

How to upload and convert XLSX file to JSON using ember.js

I am trying to allow the user to upload an XLSX file to be converted to a JSON or CSV file to be parsed through on the back-end. I am using node.js, and tried several packages including the read-excel-file
(https://github.com/catamphetamine/read-excel-file/blob/master/README.md)
readXlsxFile(file).then(function(data) {
let jsondata = JSON.parse(data);
-do something with jsondata-
});

The usual place to look for add-ons would be Ember Observer but the options available seem have a status of Work In Progress - they might be a useful place to look though to get some inspiration for how to proceed.
There are plenty of options on npm. You can import one of those into your project using the new add-on ember-auto-import or, if you'd rather do the hard work yourself, the Ember guides provide some guidance on manually importing.

You can use js-xlsx. Add it as bower dependecy and add its imports to your ember-cli-build file as:
app.import('bower_components/js-xlsx/dist/jszip.js');
app.import('bower_components/js-xlsx/dist/xlsx.min.js');
Handle it as the documentation's parsing-workbooks section shows. (handleFile function is explaining it well.)

"_.debounce is not a function" when using lodash 4.11.1

I'm completely new to lodash, but I'm trying to implement debounce as per this article. I can get it using v3.5 via this CDN but every time I try to download 4.11.1 and include it in my project I get an Uncaught Type Error: _.debounce is not a function.
Here's my script, pretty straightforward:
jQuery(window).on("resize", _.debounce(function() {
console.log("hello world");
}, 400));
Any ideas why this wouldn't be working with the newer version of lodash? I referenced the documentation and I'm not seeing anything out of place here. Very odd.

Okay, I feel dumb about this. I completely missed that there where two separate builds, "core" and "full." Apparently core doesn't come bundled with debounce. I've got it working now with the full script.

How do I add my own JavaScript libs to ClojureScript?

I want to write a Google Chrome extension, using ClojureScript. With ClojureScript I can use all the Google Closure libs, but afaik access to the Chrome browser is not included in those libs. So I want to wrap all the Chrome stuff in my own JavaScript lib.
So far I tried creating my own jar that has a single JavaScript file that just creates a Foo object and exports the constructor. I'v added this jar to the lib directory of the ClojureScript compiler (which also has for example goog.jar), but so far without luck:
Exception in thread "main" java.lang.IllegalArgumentException: No implementation of method: :-compile of protocol: #'cljs.closure/Compilable found for class: nil
at clojure.core$_cache_protocol_fn.invoke(core_deftype.clj:494)
at cljs.closure$eval1056$fn__1057$G__1047__1064.invoke(closure.clj:187)
at cljs.closure$get_compiled_cljs.invoke(closure.clj:422)
at cljs.closure$cljs_dependencies.invoke(closure.clj:440)
at cljs.closure$add_dependencies.doInvoke(closure.clj:462)
at clojure.lang.RestFn.applyTo(RestFn.java:139)
at clojure.core$apply.invoke(core.clj:602)
at cljs.closure$build.invoke(closure.clj:701)
at user$eval1246.invoke(cljsc.clj:21)
at clojure.lang.Compiler.eval(Compiler.java:6406)
at clojure.lang.Compiler.load(Compiler.java:6843)
at clojure.lang.Compiler.loadFile(Compiler.java:6804)
at clojure.main$load_script.invoke(main.clj:282)
at clojure.main$script_opt.invoke(main.clj:342)
at clojure.main$main.doInvoke(main.clj:426)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at clojure.lang.Var.invoke(Var.java:405)
at clojure.lang.AFn.applyToHelper(AFn.java:163)
at clojure.lang.Var.applyTo(Var.java:518)
at clojure.main.main(main.java:37)
Has anyone tried this before?

Take a look at this post from Luke Vanderhart: "Using JavaScript libraries in ClojureScript"
http://lukevanderhart.com/2011/09/30/using-javascript-and-clojurescript.html
Also, this video from Kevin Lynagh: "Extending JavaScript Libraries from ClojureScript"
http://www.youtube.com/watch?v=XfzXFWTT-z0

If I remember Rich Hickeys talk correctly the whole program optimization of the closure compiler needs any library code to adhere to certain coding conventions. I think he also said something of JQuery not doing this but Dojo doing this. I never did this but you might find some useful information here