docs.sheetjs.com/docz/static/systemjs/SheetJSystem.js

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2023-10-19 05:23:55 +00:00
const SystemJS = require('systemjs');
/* old SystemJS behavior */
if(typeof SystemJS.config != "undefined") SystemJS.config({ map: {
'xlsx': 'node_modules/xlsx/xlsx.js',
'fs': '@node/fs',
'crypto': '@node/crypto',
'stream': '@empty'
} });
/* new SystemJS behavior */
else SystemJS.applyImportMap(SystemJS.System, {
imports: {
'xlsx': "file://" + require("path").join(process.cwd(), 'node_modules/xlsx/xlsx.js'),
'fs': 'node:fs',
'crypto': 'node:crypto',
'stream': 'node:stream'
}
});
(typeof SystemJS.System != "undefined" ? SystemJS.System : SystemJS).import('xlsx').then(async function(_XLSX) {
if(typeof XLSX == "undefined") XLSX = _XLSX;
/* fetch JSON data and parse */
const url = "https://sheetjs.com/data/executive.json";
const raw_data = await (await fetch(url)).json();
/* filter for the Presidents */
const prez = raw_data.filter(row => row.terms.some(term => term.type === "prez"));
/* sort by first presidential term */
prez.forEach(row => row.start = row.terms.find(term => term.type === "prez").start);
prez.sort((l,r) => l.start.localeCompare(r.start));
/* flatten objects */
const rows = prez.map(row => ({
name: row.name.first + " " + row.name.last,
birthday: row.bio.birthday
}));
/* generate worksheet and workbook */
const worksheet = XLSX.utils.json_to_sheet(rows);
const workbook = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(workbook, worksheet, "Dates");
/* fix headers */
XLSX.utils.sheet_add_aoa(worksheet, [["Name", "Birthday"]], { origin: "A1" });
/* calculate column width */
const max_width = rows.reduce((w, r) => Math.max(w, r.name.length), 10);
worksheet["!cols"] = [ { wch: max_width } ];
/* create an XLSX file and try to save to Presidents.xlsx */
if(typeof XLSX.set_fs != "undefined") XLSX.set_fs(require("fs"));
XLSX.writeFile(workbook, "Presidents.xlsx");
});