Sure:
require(['jquery'], function ($) {
$.getScript("https://frappe.io/gantt/js/moment.min.js")
.done((data, textStatus) => {
$.getScript("https://frappe.io/gantt/js/snap.svg-min.js")
.done((data, textStatus) => {
console.log(data); // Data returned
console.log(textStatus); // Success
$.getScript("https://frappe.io/gantt/js/frappe-gantt.min.js")
.done((data, textStatus) => {
console.log(data); // Data returned
console.log(textStatus); // Success
console.log('Snap object: ', typeof Snap)
console.log('Ganttobject: ', typeof Gantt)
})
.fail(() => { alert('No frappe') })
})
.fail(() => { alert('No snap') })
})
.fail(() => { alert('No moment') })
});
Consider that these are just quick experiments to see whether a library fits well (like I did with others, like in Is there a timeline macro / plugin or similar? - #5 by watery), I didn’t read much about properly develop extensions, just the bare minimum (or maybe less than that 
)
14.6
This is the console output (Firefox):
JQMIGRATE: Migrate is installed with logging active, version 3.3.2 jquery-migrate.min.js:2:709
Uncaught Error: Mismatched anonymous define() module: function(){"use strict";function a(){return md.apply(null,arguments)}
// This is done to register the method called with moment()
// without creating circular dependencies.
function b(a){md=a}function c(a){return a instanceof Array||"[object Array]"===Object.prototype.toString.call(a)}function d(a){
// IE8 will treat undefined and null as object if it wasn't for
// input != null
return null!=a&&"[object Object]"===Object.prototype.toString.call(a)}function e(a){var b;for(b in a)
// even if its not own property I'd still call it non-empty
return!1;return!0}function f(a){return a instanceof Date||"[object Date]"===Object.prototype.toString.call(a)}function g(a,b){var c,d=[];for(c=0;c<a.length;++c)d.push(b(a[c],c));return d}function h(a,b){return Object.prototype.hasOwnProperty.call(a,b)}function i(a,b){for(var c in b)h(b,c)&&(a[c]=b[c]);return h(b,"toString")&&(a.toString=b.toString),h(b,"valueOf")&&(a.valueOf=b.valueOf),a}function j(a,b,c,d){return …
makeError require.min.js:5
T require.min.js:5
s require.min.js:5
[...]
emit require.min.js:5
require.min.js:5:1795
console.trace() jquery-migrate.min.js:2:1010
jQuery 2
init bootstrap.min.js:6
[...]
enable require.min.js:5
bind require.min.js:5
undefined WebHome:6:28
success WebHome:7:28
undefined WebHome:11:36
success WebHome:12:36
Snap object: undefined WebHome:14:36
Ganttobject: undefined WebHome:15:36
Uncaught Error: Mismatched anonymous define() module: function(c){return b(a,c)}
https://requirejs.org/docs/errors.html#mismatch
makeError require.min.js:5
T require.min.js:5
[...]
enable require.min.js:5
init require.min.js:5
require.min.js:5:1795
I must say it doesn’t come out always the same, i.e. this is after two or three page refreshes, here some console.log() have been executed, it seems:
Spostato su http://<xwiki-host>/xwiki/bin/view/XWikiExperiments/Gantt/Frappe/
JQMIGRATE: Migrate is installed with logging active, version 3.3.2 jquery-migrate.min.js:2:709
console.trace() jquery-migrate.min.js:2:1010
jQuery 7
<anonima> http://<xwiki-host>/xwiki/webjars/wiki:xwiki/bootstrap/3.4.1/js/bootstrap.min.js?r=1:6
<anonima> http://<xwiki-host>/xwiki/webjars/wiki:xwiki/bootstrap/3.4.1/js/bootstrap.min.js?r=1:6
console.trace() jquery-migrate.min.js:2:1010
jQuery 2
[...]
bind require.min.js:5
Uncaught Error: Mismatched anonymous define() module: function(){"use strict";function a(){return md.apply(null,arguments)}
// This is done to register the method called with moment()
// without creating circular dependencies.
function b(a){md=a}function c(a){return a instanceof Array||"[object Array]"===Object.prototype.toString.call(a)}function d(a){
// IE8 will treat undefined and null as object if it wasn't for
// input != null
return null!=a&&"[object Object]"===Object.prototype.toString.call(a)}function e(a){var b;for(b in a)
// even if its not own property I'd still call it non-empty
return!1;return!0}function f(a){return a instanceof Date||"[object Date]"===Object.prototype.toString.call(a)}function g(a,b){var c,d=[];for(c=0;c<a.length;++c)d.push(b(a[c],c));return d}function h(a,b){return Object.prototype.hasOwnProperty.call(a,b)}function i(a,b){for(var c in b)h(b,c)&&(a[c]=b[c]);return h(b,"toString")&&(a.toString=b.toString),h(b,"valueOf")&&(a.valueOf=b.valueOf),a}function j(a,b,c,d){return …
makeError http://<xwiki-host>/xwiki/webjars/wiki:xwiki/requirejs/2.3.6/require.min.js?r=1:5
T http://<xwiki-host>/xwiki/webjars/wiki:xwiki/requirejs/2.3.6/require.min.js?r=1:5
[...]
<anonymous> http://<xwiki-host>/xwiki/webjars/wiki:xwiki/xwiki-platform-tree-webjar/14.6/require-config.min.js?evaluate=true:3
require.min.js:5:1795
undefined WebHome:6:28
success WebHome:7:28
Uncaught Error: Mismatched anonymous define() module: function(c){return b(a,c)}
https://requirejs.org/docs/errors.html#mismatch
makeError http://<xwiki-host>/xwiki/webjars/wiki:xwiki/requirejs/2.3.6/require.min.js?r=1:5
T http://<xwiki-host>/xwiki/webjars/wiki:xwiki/requirejs/2.3.6/require.min.js?r=1:5
[...]
<anonymous> http://<xwiki-host>/xwiki/webjars/wiki:xwiki/xwiki-platform-ckeditor-webjar/14.6/ckeditor.js:1600
require.min.js:5:1795
Uncaught TypeError: c is null
setLang http://<xwiki-host>/xwiki/webjars/wiki:xwiki/xwiki-platform-ckeditor-webjar/14.6/ckeditor.js:255
<anonymous> http://<xwiki-host>/xwiki/bin/jsx/CKEditor/Translations?language=en:9
[...]
<anonymous> http://<xwiki-host>/xwiki/bin/jsx/CKEditor/Translations?language=en:1
ckeditor.js:255:411
undefined WebHome:11:36
success WebHome:12:36
Snap object: undefined WebHome:14:36
Ganttobject: undefined WebHome:15:36