test/parallel/test-vm-function-declaration.js

// Copyright Joyent, Inc. and other Node contributors.
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//
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'use strict';
require('../common');
const assert = require('assert');

const vm = require('vm');
const o = vm.createContext({ console });

// Function declaration and expression should both be copied to the
// sandboxed context.
let code = 'let a = function() {};\n';
code += 'function b(){}\n';
code += 'var c = function() {};\n';
code += 'var d = () => {};\n';
code += 'let e = () => {};\n';

// Grab the global b function as the completion value, to ensure that
// we are getting the global function, and not some other thing
code += '(function(){return this})().b;\n';

const res = vm.runInContext(code, o, 'test');
assert.strictEqual(typeof res, 'function');
assert.strictEqual(res.name, 'b');
assert.strictEqual(typeof o.a, 'undefined');
assert.strictEqual(typeof o.b, 'function');
assert.strictEqual(typeof o.c, 'function');
assert.strictEqual(typeof o.d, 'function');
assert.strictEqual(typeof o.e, 'undefined');
assert.strictEqual(res, o.b);