sheetjs-clone/demos/server/koasub.js

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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
const XLSX = require('xlsx');
let data = "a,b,c\n1,2,3".split("\n").map(x => x.split(","));
process.on('message', ([m, data] = _) => {
switch(m) {
case 'load data': load_data(data); break;
case 'get data': get_data(data); break;
case 'get file': get_file(data); break;
}
});
function load_data(file) {
var wb = XLSX.readFile(file);
/* generate array of arrays */
data = XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]], {header:1});
console.log(data);
process.send("done");
}
/* helper to generate the workbook object */
function make_book() {
var ws = XLSX.utils.aoa_to_sheet(data);
var wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "SheetJS");
return wb;
}
function get_data(type) {
var wb = make_book();
/* send buffer back */
process.send(XLSX.write(wb, {type:'buffer', bookType:type}));
}
function get_file(file) {
var wb = make_book();
/* write using XLSX.writeFile */
XLSX.writeFile(wb, file);
process.send("wrote to " + file + "\n");
}