module-declaration-instantiation.js

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// Exercise ModuleDeclarationInstantiation() operation.

function testModuleEnvironment(module, expected) {

    var actual = getModuleEnvironmentNames(module).sort();

    assertEq(actual.length, expected.length);

    for (var i = 0; i < actual.length; i++) {

        assertEq(actual[i], expected[i]);

// Check the environment of an empty module.

let m = parseModule("");

moduleLink(m);

testModuleEnvironment(m, []);

let a = registerModule('a', parseModule("var x = 1; export { x };"));

let b = registerModule('b', parseModule("import { x as y } from 'a';"));

moduleLink(a);

moduleLink(b);

testModuleEnvironment(a, ['x']);

testModuleEnvironment(b, ['y']);

// Function bindings are initialized as well as instantiated.

let c = parseModule(`function a(x) { return x; }

                     function b(x) { return x + 1; }

                     function c(x) { return x + 2; }

                     function d(x) { return x + 3; }`);

const names = ['a', 'b', 'c', 'd'];

testModuleEnvironment(c, names);

names.forEach((n) => assertEq(typeof getModuleEnvironmentValue(c, n), "undefined"));

moduleLink(c);

for (let i = 0; i < names.length; i++) {

    let f = getModuleEnvironmentValue(c, names[i]);

    assertEq(f(21), 21 + i);