Start on 1 and not 0 in Handlebars, no template

I am looping through items using @each, and I want to start with index 1 and not 0. I have tried something like

var Handlebars = require('handlebars');

Handlebars.registerHelper("inc", function(value, options)
{
    return parseInt(value) + 1;
});

and then

But when I am loading the page, it says

Error: Missing helper: "inc"

What is another way to do it?

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