@restorecommerce/handlebars-helperized/src/helpers/custom-helpers.ts

Opinionated handlebars based templating engine for rendering e-mail like content

let customHandlebarsExtensions = (hbs: any, opts: any) => {
  // increment a given numerical string by one
  hbs.registerHelper('increment', (value: any, hash: any) => {
    const toIncrement = parseInt(value, 10);
    if (isNaN(toIncrement)) return '0';
    return toIncrement + 1;
  });
};

module.exports = customHandlebarsExtensions;