Variant Breakdown

variants.js

current.product.variants = [{option1: 'Normal'}, {option1: 'Foil'}]; // Original Code

// Lets make some white space to make this easier ;) - then we're going to add our missing parameters.

current.product.variants = [
  {
    option1: 'Normal',
    inventory_quantity: 0,
    inventory_management: 'shopify'
  }, 
  {
    option1: 'Foil',
    inventory_quantity: 0,
    inventory_management: 'shopify'
  }
];