Node.jsでJQuery.Deferredを動かしたかったら

これははまった。以下の記述で気づけた。

This is because reqyure(‘jquery’) requires a window object

引用元：Testing javascript code that uses require('jquery') in node - Stack Overflow

jquery.js内にも記述がある

// For CommonJS and CommonJS-like environments where a proper window
// is present, execute the factory and get jQuery.
// For environments that do not have a window with a document
// (such as Node.js), expose a factory as module.exports.
// This accentuates the need for the creation of a real window.
// e.g. var jQuery = require(“jquery”)(window);
// See ticket #14549 for more info.

ticket:#14549 (npm jQuery does not expose the jQuery function, but instead a wierd factory) – jQuery - Bug Tracker

jQuery is mainly a DOM library. What would you use it for without a DOM?

そうは言うけど、ママ持ってきてさっと試したい時とかあるかもよ〜

確認1

const $ = require("jquery");
console.log($.toString());

function ( w ) {
                if ( !w.document ) {
                    throw new Error( "jQuery requires a window with a document" );
                }
                return factory( w );
            }

確認2

const $ = require("jquery");
const window = "";
try {
    $(window);
} catch (e) {
    console.log(e);
}

Error: jQuery requires a window with a document

対応

GitHub - tmpvar/jsdom: A JavaScript implementation of the WHATWG DOM and HTML standards, for use with node.jsを使って、windowを用意する。

ES6ならDestructuring assignment - JavaScript | MDNを使って

const {JSDOM} = require("jsdom");
const {window} = new JSDOM("");
const $ = require("jquery")(window);

それ以前なら

const JSDOM = require("jsdom").JSDOM;
const window = new JSDOM("").window;
const $ = require("jquery")(window);

追記

しっかり書いてあった。。https://www.npmjs.com/package/jQuery
でも動かなかった。