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