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

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