The Lana TypeScript/JavaScript core library offers pagination helper functions that facilitate fetching items in a paginated manner. You can access these functions through the import path: @lana-commerce/core/json/fetchAllItems. There are two exported functions:

• fetchAllItems - This function fetches all items at once. You need to provide the request constructor as an argument. It's important to set the sort_by parameter. The limit parameter is optional and will default to a predefined value if not specified.

  Here's an example of how you can use it:

  Example usage:

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  // Import the necessary functions
  import { prettyPrintResponseError, request } from "@lana-commerce/core/json/commerce";
  import { fetchAllItems } from "@lana-commerce/core/json/fetchAllItems";
  
  // Construct the request
  const req = request(ctx, "GET:products/page.json")
    .shop_id(ctx.shopID) // Set the shop ID
    .limit(10) // Set the limit for the number of items per page
    .sort_by("created_at"); // Specify the sorting parameter
  
  // Fetch all items
  const result = await fetchAllItems(req);
  
  // If the result doesn't contain data, throw an error
  if (result.kind !== "data") {
    throw new Error(prettyPrintResponseError(result));
  }
  
  // Print the id and title of each product
  for (const p of result.data) {
    console.log(`id: ${p.id}, title: ${p.title}`);
  }
  

• iterAllItems - This function returns an asynchronous iterator over all items. As with fetchAllItems, you need to provide the request constructor as an argument, specifying the sort_by parameter and optionally the limit. If anything goes wrong, the function will throw an IterError.

  Example usage:

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  // Import the necessary functions
  import { request } from "@lana-commerce/core/json/commerce";
  import { iterAllItems } from "@lana-commerce/core/json/fetchAllItems";
  // Construct the request
  const req = request(ctx, "GET:products/page.json")
    .shop_id(ctx.shopID) // Set the shop ID
    .limit(10) // Set the limit for the number of items per page
    .sort_by("created_at"); // Specify the sorting parameter
  // Use the async iterator to go through all items
  for await (const p of iterAllItems(req)) {
    console.log(`id: ${p.id}, title: ${p.title}`);
  }
  

In both examples, the products are sorted by their creation time and are limited to 10 products per page.