transform.js

edges = [
  {
    node: {
      description: null,
      namespace: "arena",
      valueType: "JSON_STRING",
      value:
        '["https://babywipeseco.myshopify.com/collections/nappies","https://babywipeseco.myshopify.com/collections/wipes","https://babywipeseco.myshopify.com/collections/"]',
      id: "gid://shopify/Metafield/12637127966851",
      key: "app_home__link",
    },
  },
  {
    node: {
      description: null,
      namespace: "arena",
      valueType: "JSON_STRING",
      value:
        '["https://cdn.arenacommerce.com/babywipeseco/PuraNappiesBanner.png","https://cdn.arenacommerce.com/babywipeseco/PuraWipesBanner.png","https://cdn.arenacommerce.com/babywipeseco/TestBanner.gif"]',
      id: "gid://shopify/Metafield/12637127999619",
      key: "app_home__image",
    },
  },
  {
    node: {
      description: null,
      namespace: "arena",
      valueType: "INTEGER",
      value: "1",
      id: "gid://shopify/Metafield/12637127999619",
      key: "app_home__aggregations__count",
    },
  },
  {
    node: {
      description: null,
      namespace: "arena",
      valueType: "STRING",
      value: "Summer Sale 20% Off all orders",
      id: "gid://shopify/Metafield/12637281747075",
      key: "app_home_usp",
    },
  },
];

transformMetaFields = (metaFields) => {
  const ret = {};

  for (let i = 0; i < metaFields.length; i++) {
    const item = metaFields[i];
    if (item && item.node && item.node.value) {
      const { node } = item;
      let { value } = node;
      if (node.valueType === "JSON_STRING") {
        value = JSON.parse(node.value);
      } else if (node.valueType === "INTEGER") {
        value = parseInt(node.value, 10);
      }
      const keys = node.key.split("__");
      let dict = ret;
      for (let i = 0; i < keys.length; i++) {
        const key = keys[i];
        if (i === keys.length - 1) {
          dict[key] = value;
        } else {
          if (!(key in dict)) dict[key] = {};
          dict = dict[key];
        }
      }
    }
  }
  return ret;
};

transformMetaFields(edges);