module-environment.js

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// Test top-level module environment

function testInitialEnvironment(source, expected) {

    let module = parseModule(source);

    let names = getModuleEnvironmentNames(module);

    assertEq(names.length, expected.length);

    expected.forEach(function(name) {

        assertEq(names.includes(name), true);

});

// Non-exported bindings: only top-level functions are present in the

// environment.

testInitialEnvironment('', []);

testInitialEnvironment('var x = 1;', []);

testInitialEnvironment('let x = 1;', []);

testInitialEnvironment("if (true) { let x = 1; }", []);

testInitialEnvironment("if (true) { var x = 1; }", []);

testInitialEnvironment('function x() {}', ['x']);

testInitialEnvironment("class x { constructor() {} }", []);

// Exported bindings must be present in the environment.

testInitialEnvironment('export var x = 1;', ['x']);

testInitialEnvironment('export let x = 1;', ['x']);

testInitialEnvironment('export default function x() {};', ['x']);

testInitialEnvironment('export default 1;', ['default']);

testInitialEnvironment('export default function() {};', ['default']);

testInitialEnvironment("export class x { constructor() {} }", ['x']);

testInitialEnvironment('export default class x { constructor() {} };', ['x']);

testInitialEnvironment('export default class { constructor() {} };', ['default']);

// Imports: namespace imports are present.

testInitialEnvironment('import { x } from "m";', []);

testInitialEnvironment('import * as x from "m";', ['x']);