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// Test importing module namespaces
"use strict";
load(libdir + "asserts.js");
load(libdir + "iteration.js");
load(libdir + "dummyModuleResolveHook.js");
function parseAndEvaluate(source) {
let m = parseModule(source);
m.declarationInstantiation();
return m.evaluation();
}
function testHasNames(names, expected) {
assertEq(names.length, expected.length);
expected.forEach(function(name) {
assertEq(names.includes(name), true);
});
}
let a = moduleRepo['a'] = parseModule(
`export var a = 1;
export var b = 2;`
);
let b = moduleRepo['b'] = parseModule(
`import * as ns from 'a';
export { ns };
export var x = ns.a + ns.b;`
);
b.declarationInstantiation();
b.evaluation();
testHasNames(getModuleEnvironmentNames(b), ["ns", "x"]);
let ns = getModuleEnvironmentValue(b, "ns");
testHasNames(Object.keys(ns), ["a", "b"]);
assertEq(getModuleEnvironmentValue(b, "x"), 3);
// Test module namespace internal methods as defined in 9.4.6
assertEq(Object.getPrototypeOf(ns), null);
assertThrowsInstanceOf(() => Object.setPrototypeOf(ns, null), TypeError);
assertThrowsInstanceOf(function() { ns.foo = 1; }, TypeError);
assertEq(Object.isExtensible(ns), false);
Object.preventExtensions(ns);
let desc = Object.getOwnPropertyDescriptor(ns, "a");
assertEq(desc.value, 1);
assertEq(desc.writable, true);
assertEq(desc.enumerable, true);
assertEq(desc.configurable, false);
assertEq(typeof desc.get, "undefined");
assertEq(typeof desc.set, "undefined");
assertThrowsInstanceOf(function() { ns.a = 1; }, TypeError);
delete ns.foo;
assertThrowsInstanceOf(function() { delete ns.a; }, TypeError);
// Test @@toStringTag property
desc = Object.getOwnPropertyDescriptor(ns, Symbol.toStringTag);
assertEq(desc.value, "Module");
assertEq(desc.writable, false);
assertEq(desc.enumerable, false);
assertEq(desc.configurable, true);
assertEq(typeof desc.get, "undefined");
assertEq(typeof desc.set, "undefined");
assertEq(Object.prototype.toString.call(ns), "[object Module]");
// Test @@iterator method.
let iteratorFun = ns[Symbol.iterator];
assertEq(iteratorFun.name, "[Symbol.iterator]");
let iterator = ns[Symbol.iterator]();
assertEq(iterator[Symbol.iterator](), iterator);
assertIteratorNext(iterator, "a");
assertIteratorNext(iterator, "b");
assertIteratorDone(iterator);
// The iterator's next method can only be called on the object it was originally
// associated with.
iterator = ns[Symbol.iterator]();
let iterator2 = ns[Symbol.iterator]();
assertThrowsInstanceOf(() => iterator.next.call({}), TypeError);
assertThrowsInstanceOf(() => iterator.next.call(iterator2), TypeError);
assertEq(iterator.next.call(iterator).value, "a");
assertEq(iterator2.next.call(iterator2).value, "a");
// Test cyclic namespace import and access in module evaluation.
let c = moduleRepo['c'] =
parseModule("export let c = 1; import * as ns from 'd'; let d = ns.d;");
let d = moduleRepo['d'] =
parseModule("export let d = 2; import * as ns from 'c'; let c = ns.c;");
c.declarationInstantiation();
d.declarationInstantiation();
assertThrowsInstanceOf(() => c.evaluation(), ReferenceError);
// Test cyclic namespace import.
let e = moduleRepo['e'] =
parseModule("export let e = 1; import * as ns from 'f'; export function f() { return ns.f }");
let f = moduleRepo['f'] =
parseModule("export let f = 2; import * as ns from 'e'; export function e() { return ns.e }");
e.declarationInstantiation();
f.declarationInstantiation();
e.evaluation();
f.evaluation();
assertEq(e.namespace.f(), 2);
assertEq(f.namespace.e(), 1);
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