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View current api.js.

Shopify.getCart Shopify.getCart()
Shopify Cart Shopify.addItem( , )
Shopify.addItemFromForm
variant: qty:
Shopify.addItemFromForm('add-item-form')
Shopify.removeItem Shopify.removeItem()
Shopify.changeItem Shopify.changeItem(, )
Shopify.clear Shopify.clear()
Shopify.updateCartFromForm (requires 2 items in the cart)
1. 2.
Shopify.updateCartFromForm('update-item-form')
Shopify.getProduct (requires the handle of a product)
Shopify.getProduct()
Tools
Shopify.resizeImage(
    ,
    
)

Shopify.formatMoney()