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Viewing file:     generate-js-globals.js (1.39 KB)      -rw-r--r--

"use strict";
const vm = require("vm");
const fs = require("fs");
const path = require("path");
const assert = require("assert");

// Creates a list of globals from the JS environment (not the web), so that Window.js can alias them when necessary.
// The generated list should match https://tc39.es/ecma262/#sec-global-object, to the extent V8 implements the spec.
// We generate this at build time instead of runtime because we want to avoid the performance and memory overhead of
// creating a new context when scripting is disabled in the JSDOM.

const dest = path.resolve(__dirname, "../lib/jsdom/browser/js-globals.json");

const context = vm.createContext();

const globals = vm.runInContext("Object.getOwnPropertyDescriptors(this)", context);

// I guess VM contexts have a console, from V8? That isn't a JS global and JSDOM will install its own, so don't include
// that.
delete globals.console;

// All JS globals are data properties as of the time of this writing. If that becomes false then we need to adapt the
// code in Window.js.
for (const [key, global] of Object.entries(globals)) {
  assert("value" in global && !("get" in global) && !("set" in global), `${key} was unexpectedly a non-data property`);

  // We don't want to serialize value; Window.js will get it afresh, and having it in the JSON is confusing.
  delete global.value;
}

fs.writeFileSync(dest, JSON.stringify(globals, undefined, 2) + "\n");