Testing global powers in XS

README.md

Testing global powers in XS

This test checks the status of global powers, in top level main and in a compartment.

Output

*** Testing from main
new Date(): Thu Jan 23 2020 20:13:36 GMT-0800
Date.now(): 1579839216141
Math.random(): 0.6539189622988547
Error.captureStackTrace: undefined
Error.stackTraceLimit: undefined
Error.prototype.stack: undefined
RegExp static methods: prototype,Symbol(Symbol.species)
*** Testing from compartment
new Date(): Thu Jan 23 2020 20:13:36 GMT-0800
Date.now(): 1579839216141
Math.random(): 0.41599935685098144
Error.captureStackTrace: undefined
Error.stackTraceLimit: undefined
Error.prototype.stack: undefined
RegExp static methods: prototype,Symbol(Symbol.species)

main.js

import { test } from "test";

trace('from main\n');
test();

trace('from compartment\n');
new Compartment("test").export.test();

manifest.json

{
	"include": "$(MODDABLE)/examples/manifest_base.json",
	"modules": {
		"*": [
			"./main",
			"./test",
		],
	},
	"preload": [
	],
}

test.js

function measure(msg, fn) {
  trace(`${msg}: ${fn()}\n`);
}


function desc(obj, prop) {
  if (!obj) return undefined;
  const desc = Object.getOwnPropertyDescriptor(obj, prop);
  if (!desc) return undefined;
  if (desc.value) return `value ${desc.value}`;  
  if (desc.get || desc.set) return `accessor`;  
  throw new TypeError();
}

export function test() {
  measure("new Date()", () => new Date);
  measure("Date.now()", () => Date.now());
  measure("Math.random()", () => Math.random());
  measure("Error.captureStackTrace", () => desc(Error, 'captureStackTrace'));
  measure("Error.stackTraceLimit", () => desc(Error, 'stackTraceLimit'));
  measure("Error.prototype.stack", () => desc(Error.prototype, 'stack'));
  measure("RegExp static methods", () => [
    ...Object.getOwnPropertyNames(RegExp),
    ...Object.getOwnPropertySymbols(RegExp).map(symbol => symbol.toString()),
  ]);
}