/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */ importScripts('https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.20.19/system.js'); SystemJS.config({ meta: { 'xlsx': { exports: 'XLSX' // <-- tell SystemJS to expose the XLSX variable } }, map: { 'xlsx': 'xlsx.full.min.js', // <-- make sure xlsx.full.min.js is in same dir 'fs': '', // <--| 'crypto': '', // <--| suppress native node modules 'stream': '' // <--| } }); onmessage = function(evt) { /* the real action is in the _cb function from xlsxworker.js */ SystemJS.import('xlsxworker.js').then(function() { _cb(evt); }); };