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data-es6.js
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var common = require('./data-common');
var babel = common.babel;
var typescript = common.typescript;
var chrome = common.chrome;
var edge = common.edge;
var safari = common.safari;
var graalvm = common.graalvm;
var hermes = common.hermes;
exports.name = 'ES6';
exports.target_file = 'es6/index.html';
exports.skeleton_file = 'es6/skeleton.html';
exports.tests = [
{
name: 'proper tail calls (tail call optimisation)',
category: 'optimisation',
significance: 'medium',
spec: 'http://www.ecma-international.org/ecma-262/6.0/#sec-tail-position-calls',
note_id: 'proper-tail-calls',
note_html: '<a href="https://www.stefanjudis.com/today-i-learned/proper-tail-calls-in-javascript/">'
+ 'The feature can be enabled with <code>use strict</code> and JavaScript flag <code>"--harmony-tailcalls"</code></a> '
+ 'in certain versions of Node.js. Since Node.js 8.2.1, the V8 flags '
+ '<code>--harmony-tailcalls</code> and <code>--harmony-explicit-tailcalls</code> '
+ 'have been removed. See: '
+ '<a href="https://www.chromestatus.com/feature/5516876633341952">Chrome Platform Status</a>, '
+ '<a href="https://javascript.plainenglish.io/tail-calls-in-javascript-will-there-be-a-comeback-63ac3a0523a5">'
+ 'blog in JavaScript in Plain English</a>, '
+ 'and <a href="https://v8.dev/blog/modern-javascript#proper-tail-calls">V8 Dev Blog</a> for details.',
subtests: [
{
name: 'direct recursion',
exec: function() {/*
"use strict";
return (function f(n){
if (n <= 0) {
return "foo";
}
return f(n - 1);
}(1e6)) === "foo";
*/},
res: {
tr: {
val: "flagged",
note_id: 'tr-tco',
note_html: 'Requires the <code>properTailCalls</code> compile option.'
},
babel6corejs2: false,
typescript1corejs2: typescript.fallthrough,
ie11: false,
firefox2: false,
opera10_50: false,
chrome51: chrome.harmony,
chrome58: chrome.tco,
chrome61: false,
safari10: true,
xs6: true,
duktape2_0: true,
graalvm19: false,
jerryscript2_0: false,
hermes0_7_0: false,
reactnative0_70_3: false,
rhino1_7_13: false,
rhino1_7_15: false,
}
},
{
name: 'mutual recursion',
exec: function() {/*
"use strict";
function f(n){
if (n <= 0) {
return "foo";
}
return g(n - 1);
}
function g(n){
if (n <= 0) {
return "bar";
}
return f(n - 1);
}
return f(1e6) === "foo" && f(1e6+1) === "bar";
*/},
res: {
tr: { val: "flagged", note_id: 'tr-tco' },
typescript1corejs2: typescript.fallthrough,
ie11: false,
firefox2: false,
opera10_50: false,
chrome51: chrome.harmony,
chrome58: chrome.tco,
chrome61: false,
safari10: true,
xs6: true,
duktape2_0: true,
graalvm19: false,
jerryscript2_0: false,
hermes0_7_0: false,
reactnative0_70_3: false,
rhino1_7_13: false,
rhino1_7_15: false,
}
}
]
},
{
name: 'arrow functions',
category: 'functions',
significance: 'large',
spec: 'http://www.ecma-international.org/ecma-262/6.0/#sec-arrow-function-definitions',
mdn: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions',
subtests: [
{
name: '0 parameters',
exec: function(){/*
return (() => 5)() === 5;
*/},
res: {
tr: true,
babel6corejs2: true,
es6tr: true,
jsx: true,
typescript1corejs2: true,
ejs: true,
closure: true,
ie11: false,
edge12: true,
firefox2: false,
firefox22: true,
opera10_50: false,
chrome38: chrome.experimental,
chrome40: false,
chrome45: true,
safari10: true,
node0_12: "flagged",
node4: true,
xs6: true,
duktape2_0: false,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: '1 parameter, no brackets',
exec: function(){/*
var b = x => x + "foo";
return (b("fee fie foe ") === "fee fie foe foo");
*/},
res: {
tr: true,
babel6corejs2: true,
es6tr: true,
jsx: true,
typescript1corejs2: true,
ejs: true,
closure: true,
ie11: false,
edge12: true,
firefox2: false,
firefox22: true,
opera10_50: false,
chrome38: chrome.experimental,
chrome40: false,
chrome45: true,
safari10: true,
node0_12: "flagged",
node4: true,
xs6: true,
duktape2_0: false,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: 'multiple parameters',
exec: function(){/*
var c = (v, w, x, y, z) => "" + v + w + x + y + z;
return (c(6, 5, 4, 3, 2) === "65432");
*/},
res: {
tr: true,
babel6corejs2: true,
es6tr: true,
jsx: true,
typescript1corejs2: true,
ejs: true,
closure: true,
ie11: false,
edge12: true,
firefox2: false,
firefox22: true,
opera10_50: false,
chrome38: chrome.experimental,
chrome40: false,
chrome45: true,
safari10: true,
node0_12: "flagged",
node4: true,
xs6: true,
duktape2_0: false,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: 'lexical "this" binding',
exec: function(){/*
var d = { x : "bar", y : function() { return z => this.x + z; }}.y();
var e = { x : "baz", y : d };
return d("ley") === "barley" && e.y("ley") === "barley";
*/},
res: {
tr: true,
babel6corejs2: true,
es6tr: true,
jsx: true,
typescript1corejs2: true,
ejs: true,
closure: true,
ie11: false,
edge12: true,
firefox2: false,
firefox22: true,
opera10_50: false,
chrome45: true,
safari10: true,
node4: true,
xs6: true,
duktape2_0: false,
graalvm19: true,
jerryscript2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: '"this" unchanged by call or apply',
exec: function(){/*
var d = { x : "foo", y : function() { return () => this.x; }};
var e = { x : "bar" };
return d.y().call(e) === "foo" && d.y().apply(e) === "foo";
*/},
res: {
tr: true,
closure: true,
babel6corejs2: true,
es6tr: true,
jsx: true,
typescript1corejs2: true,
ejs: true,
ie11: false,
edge12: true,
firefox2: false,
firefox22: true,
opera10_50: false,
chrome45: true,
safari10: true,
node4: true,
xs6: true,
duktape2_0: false,
graalvm19: true,
jerryscript2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: 'can\'t be bound, can be curried',
exec: function(){/*
var d = { x : "bar", y : function() { return z => this.x + z; }};
var e = { x : "baz" };
return d.y().bind(e, "ley")() === "barley";
*/},
res: {
tr: true,
babel6corejs2: true,
es6tr: true,
jsx: true,
typescript1corejs2: true,
ejs: true,
closure: true,
ie11: false,
edge12: true,
firefox2: false,
firefox22: true,
opera10_50: false,
chrome45: true,
safari10: true,
node4: true,
xs6: true,
duktape2_0: false,
graalvm19: true,
jerryscript2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: 'lexical "arguments" binding',
exec: function(){/*
var f = (function() { return z => arguments[0]; }(5));
return f(6) === 5;
*/},
res: {
tr: true,
ejs: true,
babel6corejs2: true,
closure: true,
ie11: false,
edge12: true,
firefox2: false,
firefox22: true,
firefox24: false,
firefox43: true,
opera10_50: false,
chrome45: true,
node4: true,
xs6: true,
safari10: true,
duktape2_0: false,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: 'no line break between params and <code>=></code>',
exec: function(){/*
return (() => {
try { Function("x\n => 2")(); } catch(e) { return true; }
})();
*/},
res: {
babel6corejs2: true,
closure: true,
tr: true,
typescript1corejs2: true,
ie11: false,
edge12: true,
firefox2: false,
firefox39: true,
opera10_50: false,
safari10: true,
chrome45: true,
node4: true,
xs6: true,
duktape2_0: false,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: 'correct precedence',
exec: function(){/*
return (() => {
try { Function("0 || () => 2")(); } catch(e) { return true; }
})();
*/},
res: {
closure: true,
tr: true,
ie11: false,
edge13: true,
firefox2: false,
firefox22: true,
opera10_50: false,
safari10: true,
chrome47: true,
node6: true,
node6_5: true,
xs6: false,
duktape2_0: false,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: 'no "prototype" property',
exec: function(){/*
var a = () => 5;
return !a.hasOwnProperty("prototype");
*/},
res: {
ie11: false,
edge13: true,
firefox2: false,
firefox22: true,
opera10_50: false,
chrome39: chrome.experimental,
chrome40: false,
chrome45: true,
safari10: true,
node4: true,
xs6: true,
duktape2_0: false,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: false,
reactnative0_70_3: false,
rhino1_7_13: true
}
},
{
name: 'lexical "super" binding in constructors',
exec: function(){/*
var received;
class B {
constructor (arg) {
received = arg;
}
}
class C extends B {
constructor () {
var callSuper = () => super('foo');
callSuper();
}
}
return new C instanceof C && received === 'foo'
*/},
res: {
tr: true,
babel6corejs2: false,
closure: false,
es6tr: true,
jsx: true,
typescript1corejs2: true,
ie11: false,
edge12: edge.experimental,
edge13: true,
firefox2: false,
firefox45: true,
opera10_50: false,
chrome45: "strict",
chrome49: true,
node4: "strict",
xs6: true,
safari10: true,
duktape2_0: false,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_3_0: true,
hermes0_7_0: hermes.class,
reactnative0_70_3: true,
rhino1_7_13: false
}
},
{
name: 'lexical "super" binding in methods',
exec: function(){/*
class B {
qux() {
return "quux";
}
}
class C extends B {
baz() {
return x => super.qux();
}
}
var arrow = new C().baz();
return arrow() === "quux";
*/},
res: {
tr: true,
babel6corejs2: true,
closure: true,
es6tr: true,
jsx: true,
typescript1corejs2: true,
ie11: false,
edge12: edge.experimental,
edge13: true,
firefox2: false,
firefox45: true,
opera10_50: false,
chrome45: "strict",
chrome49: true,
node4: "strict",
xs6: true,
safari10: true,
duktape2_0: false,
graalvm19: true,
jerryscript2_0: true,
hermes0_7_0: hermes.class,
reactnative0_70_3: true,
rhino1_7_13: false
}
},
{
name: 'lexical "new.target" binding',
exec: function(){/*
function C() {
return x => new.target;
}
return new C()() === C && C()() === void undefined;
*/},
res: {
firefox2: false,
firefox41: true,
opera10_50: false,
chrome46: true,
ie11: false,
edge13: true,
node5: true,
xs6: true,
safari10: true,
duktape2_0: false,
duktape2_2: false,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_3_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: false
}
}
],
},
{
name: 'const',
category: 'bindings',
significance: 'medium',
spec: 'http://www.ecma-international.org/ecma-262/6.0/#sec-let-and-const-declarations',
mdn: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const',
subtests: [
{
name: 'basic support',
exec: function() {/*
const foo = 123;
return (foo === 123);
*/},
res: {
tr: true,
babel6corejs2: true,
typescript1corejs2: true,
es6tr: true,
ejs: true,
closure: true,
ie11: true,
firefox2: false,
firefox3: true,
chrome5: true,
safari3_1: true,
opera10_50: true,
opera12: true,
konq4_14: true,
node0_12: true,
android4_0: true,
xs6: true,
jxa: true,
duktape1_4: true,
duktape2_0: true,
nashorn1_8: true,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: 'is block-scoped',
exec: function() {/*
const bar = 123;
{ const bar = 456; }
return bar === 123;
*/},
res: {
babel6corejs2: true,
typescript1corejs2: true,
es6tr: true,
tr: true,
ejs: true,
closure: true,
ie11: true,
firefox2: false,
firefox36: true,
opera10_50: false,
chrome48: chrome.experimental,
chrome49: true,
node6: true,
node6_5: true,
safari10: true,
xs6: true,
jxa: true,
duktape2_0: false,
nashorn1_8: true,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: false,
reactnative0_70_3: true,
rhino1_7_13: false
}
},
{
name: 'scope shadow resolution',
exec: function(){/*
try {
{ const bar = 456; }
const bar = 123;
return bar === 123;
} catch(e) {
return false;
}
*/},
res: {
babel6corejs2: true,
typescript1corejs2: true,
es6tr: true,
tr: true,
ejs: true,
closure: true,
ie11: true,
firefox2: false,
firefox36: true,
chrome48: "flagged",
chrome49: true,
node6: true,
node6_5: true,
safari10: false,
safari10_1: false,
safari11: true,
xs6: true,
jxa: true,
duktape2_0: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: false
}
},
{
name: 'cannot be in statements',
exec: function() {/*
const bar = 1;
try {
Function("if(true) const baz = 1;")();
} catch(e) {
return true;
}
*/},
res: {
babel6corejs2: true,
typescript1corejs2: true,
es6tr: true,
tr: true,
ejs: true,
closure: true,
ie11: true,
firefox2: false,
firefox36: true,
opera10_50: false,
chrome48: chrome.experimental,
chrome49: true,
node6: true,
node6_5: true,
safari10: true,
xs6: true,
jxa: true,
duktape2_0: false,
nashorn1_8: true,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: false
}
},
{
name: 'redefining a const is an error',
exec: function() {/*
const baz = 1;
try {
Function("const foo = 1; foo = 2;")();
} catch(e) {
return true;
}
*/},
res: {
tr: true,
babel6corejs2: true,
typescript1corejs2: true,
es6tr: true,
closure: true,
ie11: true,
firefox2: false,
firefox36: true,
opera10_50: false,
chrome48: chrome.experimental,
chrome49: true,
node6: true,
node6_5: true,
safari10: true,
xs6: true,
jxa: true,
duktape2_0: false,
nashorn1_8: true,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_3_0: true,
hermes0_7_0: false,
reactnative0_70_3: false,
rhino1_7_13: false
}
},
{
name: 'for loop statement scope',
exec: function(){/*
const baz = 1;
for(const baz = 0; false;) {}
return baz === 1;
*/},
res: {
tr: true,
ejs: true,
es6tr: true,
babel6corejs2: true,
typescript1corejs2: true,
closure: true,
ie11: true,
firefox2: false,
firefox4: { val: "flagged", note_id: 'fx-let' },
firefox36: true,
opera10_50: false,
safari10: true,
chrome48: chrome.experimental,
chrome49: true,
node6: true,
node6_5: true,
xs6: true,
duktape2_0: false,
nashorn1_8: true,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: false,
reactnative0_70_3: true,
rhino1_7_13: false
}
},
{
name: 'for-in loop iteration scope',
exec: function(){/*
var scopes = [];
for(const i in { a:1, b:1 }) {
scopes.push(function(){ return i; });
}
return (scopes[0]() === "a" && scopes[1]() === "b");
*/},
res: {
tr: true,
babel6corejs2: true,
typescript1corejs2: true,
closure: true,
safari10: true,
ie11: false,
edge14: true,
firefox2: false,
firefox51: true,
opera10_50: false,
chrome48: chrome.experimental,
chrome49: true,
node6: true,
node6_5: true,
xs6: true,
duktape2_0: false,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: false,
reactnative0_70_3: true,
rhino1_7_13: false
}
},
{
name: 'for-of loop iteration scope',
exec: function(){/*
var scopes = [];
for(const i of ['a','b']) {
scopes.push(function(){ return i; });
}
return (scopes[0]() === "a" && scopes[1]() === "b");
*/},
res: {
tr: true,
babel6corejs2: true,
typescript1corejs2: true,
closure: true,
safari10: true,
ie11: false,
edge14: true,
firefox2: false,
firefox51: true,
opera10_50: false,
chrome48: chrome.experimental,
chrome49: true,
node6: true,
node6_5: true,
xs6: true,
duktape2_0: false,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: false,
reactnative0_70_3: true,
rhino1_7_13: false
}
},
{
name: 'temporal dead zone',
exec: function(){/*
var passed = (function(){ try { qux; } catch(e) { return true; }}());
function fn() { passed &= qux === 456; }
const qux = 456;
fn();
return passed;
*/},
res: {
babel6corejs2: babel.optional,
ie11: true,
firefox2: false,
firefox36: true,
opera10_50: false,
chrome48: chrome.experimental,
chrome49: true,
node6: true,
node6_5: true,
safari10: true,
xs6: true,
jxa: true,
duktape2_0: false,
nashorn1_8: true,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: true,
hermes0_12_0: false,
reactnative0_70_3: false,
rhino1_7_13: false
}
},
{
name: 'basic support (strict mode)',
exec: function() {/*
"use strict";
const foo = 123;
return (foo === 123);
*/},
res: {
tr: true,
babel6corejs2: true,
typescript1corejs2: true,
es6tr: true,
ejs: true,
closure: true,
ie11: true,
firefox2: false,
firefox3: true,
chrome5: chrome.experimental,
chrome41: true,
safari3_1: true,
safari5_1: false,
safari10: true,
opera10_50: true,
konq4_14: true,
node0_12: "flagged",
node4: true,
xs6: true,
jxa: true,
duktape2_0: true,
nashorn1_8: true,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: true,
reactnative0_70_3: true,
rhino1_7_13: true
}
},
{
name: 'is block-scoped (strict mode)',
exec: function() {/*
'use strict';
const bar = 123;
{ const bar = 456; }
return bar === 123;
*/},
res: {
babel6corejs2: true,
typescript1corejs2: true,
es6tr: true,
tr: true,
ejs: true,
closure: true,
chrome19: chrome.experimental,
chrome41: true,
ie11: true,
firefox2: false,
firefox36: true,
opera10_50: false,
safari10: true,
node0_12: "flagged",
node4: true,
xs6: true,
jxa: true,
duktape2_0: false,
nashorn1_8: true,
nashorn9: true,
nashorn10: true,
graalvm19: true,
jerryscript2_0: false,
jerryscript2_2_0: true,
hermes0_7_0: false,
reactnative0_70_3: true,
rhino1_7_13: false
}
},
{
name: 'scope shadow resolution (strict mode)',
exec: function(){/*
'use strict';
try {
{ const bar = 456; }
const bar = 123;
return bar === 123;
} catch(e) {
return false;
}
*/},
res: {
babel6corejs2: true,
typescript1corejs2: true,
es6tr: true,
tr: true,
ejs: true,
closure: true,
chrome19 : "flagged",
chrome41: true,
ie11: true,