@netlify/plugin-edge-handlers/src/node-compat/globals.js

Netlify Build plugin to bundle Edge functions

const { randomBytes } = require("crypto");
const { dirname } = require("path");

const inject = require("@rollup/plugin-inject");

const PROCESS_PATH = require.resolve("process-es6");
const BUFFER_PATH = require.resolve("buffer-es6");
const BROWSER_PATH = require.resolve("./assets/browser.js");
const DIRNAME = "\0node-globals:dirname";
const FILENAME = "\0node-globals:filename";

/** @type {{ [str: string]: string | [string, string] }} */
const injections = {
  "process.nextTick": [PROCESS_PATH, "nextTick"],
  "process.browser": [BROWSER_PATH, "browser"],
  "Buffer.isBuffer": [BUFFER_PATH, "isBuffer"],
  process: PROCESS_PATH,
  Buffer: [BUFFER_PATH, "Buffer"],
  __filename: FILENAME,
  __dirname: DIRNAME,
};

/** @returns {import("rollup").Plugin} */
function nodeGlobals() {
  const dirs = new Map();
  return {
    ...inject({
      modules: injections,
    }),
    name: "rollup-plugin-node-globals-netlify",
    load(id) {
      if (dirs.has(id)) {
        return `export default '${dirs.get(id)}'`;
      }
    },
    resolveId: (importee, importer) => {
      if (importee === DIRNAME) {
        let id = randomBytes(15).toString("hex");
        dirs.set(id, dirname(importer));
        return id;
      }
      if (importee === FILENAME) {
        let id = randomBytes(15).toString("hex");
        dirs.set(id, importer);
        return id;
      }
    },
  };
}

module.exports = nodeGlobals;