a gatsby-source plugin example

gatsby-node.js

const fetch = require("node-fetch");
const { api_url } = require("./config");

exports.sourceNodes = async (
  { reporter, actions, createNodeId, createContentDigest },
  options
) => {
  if (process.env.NODE_ENV == "development") {
    reporter.warn("Welcome to MYCustomer Plugin");
  }
  const { createNode } = actions;
  // Create nodes here, generally by downloading data
  // from a remote API.
  const resp = await fetch(`${api_url}/users`);
  const data = await resp.json();

  data.forEach(customerData => {
    const nodeContent = JSON.stringify(customerData);
    const nodeMeta = {
      // the customer unique id is in _id
      id: createNodeId(`customer-${customerData.id}`),
      parent: null,
      children: [],
      internal: {
        // this will be important in finding the node
        type: `customer`,
        content: nodeContent,
        contentDigest: createContentDigest(customerData)
      }
    };
    const node = Object.assign({}, customerData, nodeMeta);

    console.log("\n customer id --> ", customerData.id);
    createNode(node);
  }); // We're done, return.
  return;
};