How to fetch all products from Shopify in a single query

create-subscription.js

const setup = async () => {
  const data = `
mutation {
  webhookSubscriptionCreate(
    topic: BULK_OPERATIONS_FINISH
    webhookSubscription: {
      format: JSON,
      callbackUrl: "https://firebase-app.cloudfunctions.net/processAllProducts"}
  ) {
    userErrors {
      field
      message
    }
    webhookSubscription {
      id
    }
  }
}`;

  const client = new Shopify.Clients.Graphql(
    'your-shop.myshopify.com',
    process.env.SHOPIFY_ACCESS_TOKEN
  );
  const res = await client.query({ data });

  console.log(JSON.stringify(res.body, null, 2));
};

get-url-with-data.js

const retrieveUrl = async admin_graphql_api_id => {
  const data = `
  query {
    node(id: "${admin_graphql_api_id}") {
      ... on BulkOperation {
        url
        partialDataUrl
      }
    }
  }`;

  const client = new Shopify.Clients.Graphql(
    'your-shop.myshopify.com',
    process.env.SHOPIFY_ACCESS_TOKEN
  );
  const res = await client.query({ data });

  return res.body.data.node.url;
};

submit-query.js

import { Shopify } from '@shopify/shopify-api';

const fetchAllProducts = async () => {
  // https://shopify.dev/api/usage/bulk-operations/queries#step-1-submit-a-query
  const queryString = `mutation {
        bulkOperationRunQuery(
         query: """
          {
            products {
              edges {
                node {
                  id
                  title
                  variants {
                    edges {
                        node {
                            title
                            inventoryQuantity
                            id
                            sku
                            inventoryItem {
                              id
                            }
                            metafields {
                              edges {
                                node {
                                  namespace
                                  key
                                  value
                                }
                              }
                            }
                        }
                    }
                  }
                }
              }
            }
          }
          """
        ) {
          bulkOperation {
            id
            status
          }
          userErrors {
            field
            message
          }
        }
      }`;

  const client = new Shopify.Clients.Graphql(
    'your-shop.myshopify.com',
    process.env.SHOPIFY_ACCESS_TOKEN
  );
  const res = await client.query({
    data: queryString
  });

  return res.body;
};