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