sheetjs_sheetjs/types/doc.ts

import * as XLSX from 'xlsx';
import * as fs from 'fs';

const version: string = XLSX.version;

const SSF = XLSX.SSF;

let read_opts: XLSX.ParsingOptions = {
	type: "buffer",
	raw: false,
	cellFormula: false,
	cellHTML: false,
	cellNF: false,
	cellStyles: false,
	cellText: false,
	cellDates: false,
	dateNF: "yyyy-mm-dd",
	sheetStubs: false,
	sheetRows: 3,
	bookDeps: false,
	bookFiles: false,
	bookProps: false,
	bookSheets: false,
	bookVBA: false,
	password: "",
	WTF: false
};

let write_opts: XLSX.WritingOptions = {
	type: "buffer",
	cellDates: false,
	bookSST: false,
	bookType: "xlsx",
	sheet: "Sheet1",
	compression: false,
	Props: {
		Author: "Someone",
		Company: "SheetJS LLC"
	}
};

const wb1 = XLSX.readFile("sheetjs.xls", read_opts);
XLSX.writeFile(wb1, "sheetjs.new.xlsx", write_opts);

read_opts.type = "binary";
const wb2 = XLSX.read("1,2,3\n4,5,6", read_opts);
write_opts.type = "binary";
const out2 = XLSX.write(wb2, write_opts);

read_opts.type = "buffer";
const wb3 = XLSX.read(fs.readFileSync("sheetjs.xlsx"), read_opts);
write_opts.type = "base64";
const out3 = XLSX.write(wb3, write_opts);
write_opts.type = "array";
const out4 = XLSX.write(wb3, write_opts);

const ws1 = XLSX.utils.aoa_to_sheet([
    "SheetJS".split(""),
    [1,2,3,4,5,6,7],
    [2,3,4,5,6,7,8]
], {
	dateNF: "yyyy-mm-dd",
	cellDates: true,
	sheetStubs: false
});

const ws1b = XLSX.utils.aoa_to_sheet([ "SheetJS".split("") ]);
XLSX.utils.sheet_add_aoa(ws1b, [[1,2], [2,3], [3,4]], {origin: "A2"});
XLSX.utils.sheet_add_aoa(ws1b, [[5,6,7], [6,7,8], [7,8,9]], {origin:{r:1, c:4}});
XLSX.utils.sheet_add_aoa(ws1b, [[4,5,6,7,8,9,0]], {origin: -1});

const ws2 = XLSX.utils.json_to_sheet([
    {S:1,h:2,e:3,e_1:4,t:5,J:6,S_1:7},
    {S:2,h:3,e:4,e_1:5,t:6,J:7,S_1:8}
], {
	header:["S","h","e","e_1","t","J","S_1"],
	cellDates: true,
	dateNF: "yyyy-mm-dd"
});

const ws2b = XLSX.utils.json_to_sheet([
  { A:"S", B:"h", C:"e", D:"e", E:"t", F:"J", G:"S" },
  { A: 1,  B: 2,  C: 3,  D: 4,  E: 5,  F: 6,  G: 7  },
  { A: 2,  B: 3,  C: 4,  D: 5,  E: 6,  F: 7,  G: 8  }
], {header:["A","B","C","D","E","F","G"], skipHeader:true});

const ws2c = XLSX.utils.json_to_sheet([
  { A: "S", B: "h", C: "e", D: "e", E: "t", F: "J", G: "S" }
], {header: ["A", "B", "C", "D", "E", "F", "G"], skipHeader: true});
XLSX.utils.sheet_add_json(ws2c, [
  { A: 1, B: 2 }, { A: 2, B: 3 }, { A: 3, B: 4 }
], {skipHeader: true, origin: "A2"});
XLSX.utils.sheet_add_json(ws2c, [
  { A: 5, B: 6, C: 7 }, { A: 6, B: 7, C: 8 }, { A: 7, B: 8, C: 9 }
], {skipHeader: true, origin: { r: 1, c: 4 }, header: [ "A", "B", "C" ]});
XLSX.utils.sheet_add_json(ws2c, [
  { A: 4, B: 5, C: 6, D: 7, E: 8, F: 9, G: 0 }
], {header: ["A", "B", "C", "D", "E", "F", "G"], skipHeader: true, origin: -1});

const tbl = {}; /* document.getElementById('table'); */
const ws3 = XLSX.utils.table_to_sheet(tbl, {
	raw: true,
	cellDates: true,
	dateNF: "yyyy-mm-dd",
	sheetRows: 1
});

const obj1 = XLSX.utils.sheet_to_formulae(ws1);

const str1: string = XLSX.utils.sheet_to_csv(ws2, {
	FS: "\t",
	RS: "|",
	dateNF: "yyyy-mm-dd",
	strip: true,
	blankrows: true,
	skipHidden: true
});

const html1: string = XLSX.utils.sheet_to_html(ws3, {
	editable: false
});

const arr1: object[] = XLSX.utils.sheet_to_json(ws1, {
	raw: true,
	range: 1,
	header: "A",
	dateNF: "yyyy-mm-dd",
	defval: 0,
	blankrows: true
});

const arr2: any[][] = XLSX.utils.sheet_to_json<any[][]>(ws2, {
	header: 1
});

const arr3: any[] = XLSX.utils.sheet_to_json(ws3, {
	header: ["Sheet", "JS", "Rocks"]
});