Cannot get require to work in IE

Question

Getting error in IE11. No error in other browsers.

For example, using a basic Esri sample below errors in IE.

Same issue in 4.12

Version 3.9 works in IE

// *************************************************// API loaded in footer...// https://js.arcgis.com/4.11/esri/css/main.css
// https://js.arcgis.com/4.11/// *************************************************function somefunc() {  try {    require(["esri/Map", "esri/views/MapView"], function(Map, MapView) {        var map = new Map({          basemap: "streets"        });        var view = new MapView({          container: "mapViewer",          map: map,          zoom: 4,          center: [15, 65] // longitude, latitude        });    });  } catch (error) {    console.log(error);  }}// ****************************// Error output to console// ****************************TypeError: [object Object] is not an object!
 {
 [functions]: ,
@hasInstance: undefined,
@isConcatSpreadable: undefined,
@iterator: undefined,
@match: undefined,
@observable: undefined,
@replace: undefined,
@search: undefined,
@species: undefined,
@split: undefined,
@toPrimitive: undefined,
@toStringTag: undefined,
@unscopables: undefined,
 __proto__: { },
 at Anonymous function (https://js.arcgis.com/4.11/?ver=4.11:429:211)
 at K (https://js.arcgis.com/4.11/?ver=4.11:19:73)
 at K (https://js.arcgis.com/4.11/?ver=4.11:18:398)
 at K (https://js.arcgis.com/4.11/?ver=4.11:18:398)
 at K (https://js.arcgis.com/4.11/?ver=4.11:18:398)
 at K (https://js.arcgis.com/4.11/?ver=4.11:18:398)
 at K (https://js.arcgis.com/4.11/?ver=4.11:18:398)",
 Symbol()_g.hbfjhg26xy3: undefined
 }

GregoryBologna · Answer

I found the issue.

I am using pdf.js to generated PDF files in another part of my website, and unrelated to Esri. The map works when I remove the reference to pdf.js.

GregoryBologna · Answer

Thanks, but I am using wordpress and need esri to load as defered and in footer, otherwise it gets multipleDefined errors from jQuery. Chrome\Firefox\Opera\Edge all work as is.

JackFairfield · Answer

Move your script tag to the header:

Example:

JS Bin - Collaborative JavaScript Debugging