node.js script to generate the list of MDN interface data from webref

update-interface-data.js

const fs = require("fs").promises;

// @@@ download latest tagged version of @webref/idl repo
const webrefPath = "../../webref/ed/";
(async function () {
  const interfaceData = {};
  const index = JSON.parse(await fs.readFile(webrefPath + "idlnames.json", "utf-8"));
  (await Promise.all(
    Object.entries(index)
      .sort(([k1, v1], [k2, v2]) => k1.localeCompare(k2))
      .map(async ([,{parsed: jsonIdlPath}]) => await fs.readFile(webrefPath + jsonIdlPath, "utf-8"))
  )).forEach(jsonData => {
    const jsonIdl = JSON.parse(jsonData);
    if (jsonIdl.type === "interface" || jsonIdl.type === "interface mixin") {
      interfaceData[jsonIdl.name] = {
        inh: jsonIdl.inheritance?.name || "",
        impl: jsonIdl.includes.map(i => i.name)
      };
    }
  });
  console.log(JSON.stringify(interfaceData, null, 2));
})();