Cannot get require to work in IE

GregoryBologna

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

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.