js-dicom/src/FileUtility/loadFile.js

this is js-dicom

import $ from 'jquery';

function loadFile(file) {
    const deferred = $.Deferred();
    var a = new FileReader();
    a.onload = function (e) {
        deferred.resolve(e.target.result);
    };
    a.onerror = function (error) {
        deferred.reject(error);
    };
    a.readAsArrayBuffer(file);
    return deferred.promise();
}

export  default  loadFile;