JavaScript API: openTemplate

import { CreateXlsx } from "build";
import * as fs from "fs";

const xlsxTemplate = fs.readFileSync("template.xlsx").buffer;

const xlsx = new CreateXlsx();
xlsx.openTemplate(xlsxTemplate).then(xlsx => {
    xlsx.save().then(contents => {
        fs.writeFileSync("openTemplate_1.xlsx", Buffer.from(contents));
    });
});

Release notes

phpxlsx 5.0:
- new method.