code.delx.au - gnu-emacs-elpa/blob - NEWS.md

   1 # History of user-visible changes
   2
   3 ## Next
   4
   5 * Object properties are highlighted using a different face:
   6   `js2-object-property`, which has no color by default.
   7 * `js2-getter-setter-node` is renamed to `js2-method-node`, together
   8   with its related functions.  It already handles generator methods,
   9   and will in the future add support for async methods, so the old
  10   name will get more confusing.
  11 * Support for default parameters in destructuring.  It should work for both
  12   objects and arrays, in both literals and function arguments.
  13
  14 ## 20150909
  15
  16 * `js2-mode` now derives from `js-mode`. That means the former
  17   function will run `js-mode-hook`, as well as `js2-mode-hook`. The
  18   key bindings will default to `js-mode-map` where they're not set in
  19   `js2-mode-map`. And in Emacs 25 or later (including the snapshot
  20   builds), `js2-mode` uses the indentation code from `js-mode`.  Where
  21   feasible, the user options (and functions) now have aliases, but if
  22   you're using Emacs 25 and you see an indentation-related setting
  23   that stopped working, try looking for a corresponding one in the
  24   `js` group: `M-x customize-group RET js RET`.
  25
  26 * New command: `js2-jump-to-definition`. It's bound to `M-.` by
  27   default, via remapping `js-find-symbol`. To get back to the default
  28   `M-.` binding (e.g. `find-tag`), put this in your init file:
  29
  30       (eval-after-load 'js (define-key js-mode-map (kbd "M-.") nil))
  31
  32 ## 20150713
  33
  34 * More comprehensive strict mode warnings and syntax errors.
  35 * New minor mode: `js2-highlight-unused-variables-mode`.
  36 * `js2-pretty-multiline-declarations` can take the value `dynamic` now.
  37
  38 ## 20150202
  39
  40 Support for:
  41
  42 * [ES6 modules](http://www.2ality.com/2014/09/es6-modules-final.html).
  43 * [Short-hand object literals](http://ariya.ofilabs.com/2013/02/es6-and-object-literal-property-value-shorthand.html).
  44 * [Method definitions](http://ariya.ofilabs.com/2013/03/es6-and-method-definitions.html).
  45 * ['u' and 'y' RegExp flags](https://mathiasbynens.be/notes/es6-unicode-regex).
  46 * [Computed property names](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-object-initializer).
  47 * [Class statements and expressions](https://github.com/lukehoban/es6features#classes).
  48 * [Template strings](http://tc39wiki.calculist.org/es6/template-strings/), including tagged ones.
  49
  50 The variable `js2-allow-keywords-as-property-names` has been
  51 removed. Instead we check if `js2-language-version` is 180 or highter.
  52
  53 ## 20141115
  54
  55 Support for:
  56
  57 * Unicode characters in identifiers (improved).
  58 * [Delegating yield](http://wiki.ecmascript.org/doku.php?id=harmony:generators#delegating_yield).
  59 * [ES6 numeric literals](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-literals-numeric-literals) (octal, binary).
  60 * Harmony [array and generator comprehensions](http://wingolog.org/archives/2014/03/07/es6-generator-and-array-comprehensions-in-spidermonkey).
  61
  62 ## 20131106
  63
  64 Support for:
  65
  66 * [Arrow functions](http://wiki.ecmascript.org/doku.php?id=harmony:arrow_function_syntax)
  67 * [Generators](http://wiki.ecmascript.org/doku.php?id=harmony:generators)
  68 * [Spread operator](http://wiki.ecmascript.org/doku.php?id=harmony:spread)
  69
  70 ## 20130510
  71
  72 ### Support for JSLint global declaration
  73
  74 See the docstring for `js2-include-jslint-globals`.
  75
  76 ## 20130216
  77
  78 ### We don't rebind `RET` anymore
  79
  80 Because well-behaving major modes aren't supposed to do that.
  81
  82 So pressing it won't continue a block comment, or turn a string into a concatenation.
  83 Pressing `M-j`, however, will.
  84
  85 The options `js2-indent-on-enter-key` and `js2-enter-indents-newline` were also removed.
  86
  87 To bring back the previous behavior, put this in your init file:
  88
  89 ```js
  90 (eval-after-load 'js2-mode
  91   '(define-key js2-mode-map (kbd "RET") 'js2-line-break))
  92 ```
  93
  94 ## 20120617
  95
  96 ### Support for [default](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/default_parameters) and [rest](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/rest_parameters) parameters
  97
  98 ## 20120614
  99
 100 ### Support for [for..of loops](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of)
 101
 102 ## Older changes
 103
 104 ### Popular indentation style
 105
 106 ```js
 107 [foo, bar, baz].forEach(function (v) {
 108     if (validate(v))
 109         process(v);
 110 });
 111
 112 [a, b, c].some(function (v) {
 113     return validate(v);
 114 });
 115 ```
 116
 117 ### Pretty multiline variable declaration
 118
 119 In the original mode,
 120
 121 ```js
 122 var foo = 10,
 123 bar = 20,
 124 baz = 30;
 125 ```
 126
 127 In this mode when the value of `js2-pretty-multiline-declarations` is non-nil,
 128
 129 ```js
 130 var foo = 10,
 131     bar = 20,
 132     baz = 30;
 133 ```
 134
 135 ### Abbreviated destructuring assignments
 136
 137 ```js
 138 let {a, b}       = {a: 10, b: 20}; // Abbreviated   (Not supported in the original mode)
 139 let {a: a, b: b} = {a: 10, b: 20}; // Same as above (Supported in the original mode)
 140
 141 (function ({responseText}) { /* */ })(xhr); // As the argument of function
 142
 143 for (let [k, { name, age }] in Iterator(obj)) // nested
 144     print(k, name, age);
 145 ```
 146
 147 ### Expression closure in property value
 148
 149 ```js
 150 let worker = {
 151     get age() 20,
 152     get sex() "male",
 153     fire: function () _fire()
 154 };
 155 ```
 156
 157 ### Fix for odd indentation of "else if" with no braces
 158
 159 In the original mode,
 160
 161 ```js
 162 if (foo)
 163     return foo;
 164 else if (bar)
 165 return bar;      // here
 166 ```
 167
 168 In this mode,
 169
 170 ```js
 171 if (foo)
 172     return foo;
 173 else if (bar)
 174     return bar;  // fixed
 175 ```
 176
 177 ### Imenu support for function nesting
 178
 179 Supports function nesting and anonymous wrappers:
 180
 181 ```js
 182 (function() {
 183   var foo = function() {
 184     function bar() { // shown as foo.bar.<definition-1>
 185       function baz() {} // foo.bar.baz
 186       var qux = function() {}; // foo.bar.quux
 187     }
 188   };
 189 });
 190 ```
 191
 192 Examples of output:
 193
 194 * [jQuery 1.5](https://gist.github.com/845449)
 195 * [Underscore.js](https://gist.github.com/824262)
 196 * [Backbone.js](https://gist.github.com/824260)
 197
 198 For library-specific extension methods like `$.extend` and `dojo.declare`, see [js2-imenu-extras](/mooz/js2-mode/blob/master/js2-imenu-extras.el).
 199
 200 ### Undeclared/external variables highlighting
 201
 202 Original mode highlights them only on the left side of assignments:
 203
 204 ```js
 205 var house;
 206 hose = new House(); // highlights "hose"
 207 ```
 208
 209 Here they are highlighted in all expressions:
 210
 211 ```js
 212 function feed(fishes, food) {
 213     for each (var fish in fshes) { // highlights "fshes"
 214         food.feed(fsh); // highlights "fsh"
 215     }
 216     hood.discard(); // highlights "hood"
 217 }
 218 ```
 219
 220 Destructuring assignments and array comprehensions (JS 1.7) are supported:
 221
 222 ```js
 223 let three, [one, two] = [1, 2];
 224 thee = one + two; // highlights "thee"
 225
 226 function revenue(goods) {
 227     // highlights "coast"
 228     return [price - coast for each ({price, cost} in goods)].reduce(add);
 229 }
 230 ```