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

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