+# History of user-visible changes
+
+## 2016-06-23
+
+* New variable `js2-mode-assume-strict`, for use with ES6 modules.
+* Support for JSDoc @callback, @func and @method tags.
+* Object properties are highlighted using a different face:
+ `js2-object-property`, which has no color by default.
+* Experimental support for object rest/spread ECMAScript proposal.
+* `js2-getter-setter-node` is renamed to `js2-method-node`, together with
+ its related functions. It already handles generator methods, and we
+ added support for async methods (see below), so the old name would get
+ more confusing.
+* Support for default parameters in destructuring. It should work for both
+ objects and arrays, in both literals and function arguments.
+* New mode: `js2-jsx-mode`, deriving from `js2-mode`. Supports indentation of
+ JSXElement expressions wrapped within parentheses or as function arguments.
+ Indentation is customizable via `sgml-attribute-offset`.
+* Experimental support for async/await ECMAScript proposal.
+
+## 20150909
+
+* `js2-mode` now derives from `js-mode`. That means the former
+ function will run `js-mode-hook`, as well as `js2-mode-hook`. The
+ key bindings will default to `js-mode-map` where they're not set in
+ `js2-mode-map`. And in Emacs 25 or later (including the snapshot
+ builds), `js2-mode` uses the indentation code from `js-mode`. Where
+ feasible, the user options (and functions) now have aliases, but if
+ you're using Emacs 25 and you see an indentation-related setting
+ that stopped working, try looking for a corresponding one in the
+ `js` group: `M-x customize-group RET js RET`.
+
+* New command: `js2-jump-to-definition`. It's bound to `M-.` by
+ default, via remapping `js-find-symbol`. To get back to the default
+ `M-.` binding (e.g. `find-tag`), put this in your init file:
+
+ (eval-after-load 'js (define-key js-mode-map (kbd "M-.") nil))
+
+## 20150713
+
+* More comprehensive strict mode warnings and syntax errors.
+* New minor mode: `js2-highlight-unused-variables-mode`.
+* `js2-pretty-multiline-declarations` can take the value `dynamic` now.
+
+## 20150202
+
+Support for:
+
+* [ES6 modules](http://www.2ality.com/2014/09/es6-modules-final.html).
+* [Short-hand object literals](http://ariya.ofilabs.com/2013/02/es6-and-object-literal-property-value-shorthand.html).
+* [Method definitions](http://ariya.ofilabs.com/2013/03/es6-and-method-definitions.html).
+* ['u' and 'y' RegExp flags](https://mathiasbynens.be/notes/es6-unicode-regex).
+* [Computed property names](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-object-initializer).
+* [Class statements and expressions](https://github.com/lukehoban/es6features#classes).
+* [Template strings](http://tc39wiki.calculist.org/es6/template-strings/), including tagged ones.
+
+The variable `js2-allow-keywords-as-property-names` has been
+removed. Instead we check if `js2-language-version` is 180 or highter.
+
## 20141115
Support for:
To bring back the previous behavior, put this in your init file:
- (eval-after-load 'js2-mode
- '(define-key js2-mode-map (kbd "RET") 'js2-line-break))
+```js
+(eval-after-load 'js2-mode
+ '(define-key js2-mode-map (kbd "RET") 'js2-line-break))
+```
## 20120617
### Popular indentation style
- [foo, bar, baz].forEach(function (v) {
- if (validate(v))
- process(v);
- });
+```js
+[foo, bar, baz].forEach(function (v) {
+ if (validate(v))
+ process(v);
+});
- [a, b, c].some(function (v) {
- return validate(v);
- });
+[a, b, c].some(function (v) {
+ return validate(v);
+});
+```
### Pretty multiline variable declaration
In the original mode,
- var foo = 10,
- bar = 20,
- baz = 30;
+```js
+var foo = 10,
+bar = 20,
+baz = 30;
+```
In this mode when the value of `js2-pretty-multiline-declarations` is non-nil,
- var foo = 10,
- bar = 20,
- baz = 30;
+```js
+var foo = 10,
+ bar = 20,
+ baz = 30;
+```
### Abbreviated destructuring assignments
- let {a, b} = {a: 10, b: 20}; // Abbreviated (Not supported in the original mode)
- let {a: a, b: b} = {a: 10, b: 20}; // Same as above (Supported in the original mode)
+```js
+let {a, b} = {a: 10, b: 20}; // Abbreviated (Not supported in the original mode)
+let {a: a, b: b} = {a: 10, b: 20}; // Same as above (Supported in the original mode)
- (function ({responseText}) { /* */ })(xhr); // As the argument of function
+(function ({responseText}) { /* */ })(xhr); // As the argument of function
- for (let [k, { name, age }] in Iterator(obj)) // nested
- print(k, name, age);
+for (let [k, { name, age }] in Iterator(obj)) // nested
+ print(k, name, age);
+```
### Expression closure in property value
- let worker = {
- get age() 20,
- get sex() "male",
- fire: function () _fire()
- };
+```js
+let worker = {
+ get age() 20,
+ get sex() "male",
+ fire: function () _fire()
+};
+```
### Fix for odd indentation of "else if" with no braces
In the original mode,
- if (foo)
- return foo;
- else if (bar)
- return bar; // here
+```js
+if (foo)
+ return foo;
+else if (bar)
+return bar; // here
+```
In this mode,
- if (foo)
- return foo;
- else if (bar)
- return bar; // fixed
+```js
+if (foo)
+ return foo;
+else if (bar)
+ return bar; // fixed
+```
### Imenu support for function nesting
Supports function nesting and anonymous wrappers:
- (function() {
- var foo = function() {
- function bar() { // shown as foo.bar.<definition-1>
- function baz() {} // foo.bar.baz
- var qux = function() {}; // foo.bar.quux
- }
- };
- });
+```js
+(function() {
+ var foo = function() {
+ function bar() { // shown as foo.bar.<definition-1>
+ function baz() {} // foo.bar.baz
+ var qux = function() {}; // foo.bar.quux
+ }
+ };
+});
+```
Examples of output:
Original mode highlights them only on the left side of assignments:
- var house;
- hose = new House(); // highlights "hose"
+```js
+var house;
+hose = new House(); // highlights "hose"
+```
Here they are highlighted in all expressions:
- function feed(fishes, food) {
- for each (var fish in fshes) { // highlights "fshes"
- food.feed(fsh); // highlights "fsh"
- }
- hood.discard(); // highlights "hood"
+```js
+function feed(fishes, food) {
+ for each (var fish in fshes) { // highlights "fshes"
+ food.feed(fsh); // highlights "fsh"
}
+ hood.discard(); // highlights "hood"
+}
+```
Destructuring assignments and array comprehensions (JS 1.7) are supported:
- let three, [one, two] = [1, 2];
- thee = one + two; // highlights "thee"
+```js
+let three, [one, two] = [1, 2];
+thee = one + two; // highlights "thee"
- function revenue(goods) {
- // highlights "coast"
- return [price - coast for each ({price, cost} in goods)].reduce(add);
- }
+function revenue(goods) {
+ // highlights "coast"
+ return [price - coast for each ({price, cost} in goods)].reduce(add);
+}
+```