├── .gitignore ├── .npmignore ├── .travis.yml ├── LICENSE ├── README.md ├── cjs └── index.js ├── coverage ├── coverage.json ├── lcov-report │ ├── base.css │ ├── endow │ │ ├── cjs │ │ │ ├── index.html │ │ │ └── index.js.html │ │ ├── index.html │ │ └── test.js.html │ ├── index.html │ ├── prettify.css │ ├── prettify.js │ ├── sort-arrow-sprite.png │ └── sorter.js └── lcov.info ├── esm └── index.js ├── index.js ├── min.js ├── package.json └── test.js /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | node_modules/ -------------------------------------------------------------------------------- /.npmignore: -------------------------------------------------------------------------------- 1 | coverage/* 2 | esm/.eslintrc 3 | node_modules/* 4 | test.js 5 | .DS_Store 6 | .gitignore 7 | .travis.yml 8 | package-lock.json 9 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: node_js 2 | node_js: 3 | - stable 4 | git: 5 | depth: 1 6 | branches: 7 | only: 8 | - master 9 | after_success: 10 | - "npm run coveralls" -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | ISC License 2 | 3 | Copyright (c) 2018, Andrea Giammarchi, @WebReflection 4 | 5 | Permission to use, copy, modify, and/or distribute this software for any 6 | purpose with or without fee is hereby granted, provided that the above 7 | copyright notice and this permission notice appear in all copies. 8 | 9 | THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH 10 | REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11 | AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, 12 | INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13 | LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14 | OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15 | PERFORMANCE OF THIS SOFTWARE. 16 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # endow [![Coverage Status](https://coveralls.io/repos/github/WebReflection/endow/badge.svg?branch=master)](https://coveralls.io/github/WebReflection/endow?branch=master) [![Build Status](https://travis-ci.org/WebReflection/endow.svg?branch=master)](https://travis-ci.org/WebReflection/endow) [![License: ISC](https://img.shields.io/badge/License-ISC-yellow.svg)](https://opensource.org/licenses/ISC) 2 | 3 | A minimalistic, yet powerful, class based mixin utility. 4 | 5 | Following an approach explained in [this post](http://justinfagnani.com/2015/12/21/real-mixins-with-javascript-classes/), 6 | and inspired by one piece of [the following utility](https://github.com/justinfagnani/mixwith.js#mixwith), 7 | _endow_ makes creation of mixins a no-brainer, giving the ability to use `instanceof` operator. 8 | 9 | ```js 10 | // define mixins through this class based pattern 11 | const Mixin1 = Super => class extends Super { 12 | behavior1() {} 13 | }; 14 | const Mixin2 = Super => class extends Super { 15 | behavior2() {} 16 | }; 17 | 18 | // endow classes with mixins while extending 19 | class Sub extends endow(Super).with(Mixin1, Mixin2) { 20 | behaviors() { 21 | this.behavior1(); 22 | this.behavior2(); 23 | } 24 | } 25 | 26 | new Sub instanceof Sub; // true 27 | new Sub instanceof Super; // true 28 | new Sub instanceof Mixin1; // true 29 | new Sub instanceof Mixin2; // true 30 | ``` 31 | 32 | ### How to include 33 | 34 | * _ESM_ via `import endow from 'endow/esm'` 35 | * _CJS_ via `const {endow} = require('endow/cjs');` 36 | * browsers via [unpkg.com/endow](https://unpkg.com/endow) 37 | 38 | 39 | ### Compatibility 40 | 41 | This module syntax is purposely written in an ES3 compatible fashion. 42 | 43 | ES5 [Array#some](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some) and [Symbol](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol) are needed, 44 | and to have a proper `instanceof` operator result, the [Symbol.hasInstance](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance) is needed too, 45 | but it's not mandatory. 46 | 47 | Please note this utility works with all polyfills (loaded upfront) and transpilers too. 48 | 49 | #### Size 50 | 51 | * plain `index.js` is 2535 bytes 52 | * plain `min.js` is 499 bytes 53 | * gzip `min.js` is 337 bytes 54 | * brotli `min.js` is 277 bytes 55 | -------------------------------------------------------------------------------- /cjs/index.js: -------------------------------------------------------------------------------- 1 | 'use strict'; 2 | /*! (c) Andrea Giammarchi, @WebReflection (ISC) */ 3 | // inspired by https://github.com/justinfagnani/mixwith.js#mixwith 4 | 5 | // If not available, Symbol could even be a special `String` here 6 | var classes = Symbol('endow'); 7 | 8 | // fallback to same symbol, ignore hasInstance completely 9 | // in this case code will be transpiled and the result 10 | // of every instanceof will be simply false 11 | var hasInstance = Symbol.hasInstance || classes; 12 | 13 | // Symbol.hasInstance descriptor is always the same 14 | // no need to pollute GC with useless garbage 15 | var descriptor = { 16 | configurable: true, 17 | value: function (object) { 18 | return this[classes].some(instanceOf, object); 19 | } 20 | }; 21 | 22 | // endow can be imported as default or as {endow} 23 | Object.defineProperty(exports, '__esModule', {value: true}).default = endow; 24 | function endow(Super) { 25 | return { 26 | // IE < 9 might throw with code that uses `{with: ...}` 27 | "with": function () { 28 | for (var 29 | Mixin, 30 | Class = Super, 31 | i = 0, length = arguments.length; i < length; i++ 32 | ) { 33 | Mixin = arguments[i]; 34 | Class = Mixin(Class); 35 | // A Mixin knows all classes it extended. 36 | // there is no iterable WeakSet to do this, 37 | // so derived classes are retained once. 38 | // This should not be a real-world issue 39 | // because classes are usually a pre-defined, 40 | // well known, amount. 41 | // If you create a lot of classes on the fly though, 42 | // and you'd like to use endow, be sure you drain 43 | // that Mixin list from time to time. 44 | // 45 | // Object.getOwnPropertySymbols(Mixin) 46 | // .some(s => /\bendow\b/.test(String(s)) && Mixin[s].splice(0)); 47 | // 48 | // Please note after that instanceof operations won't be reliable. 49 | // If you create a lot of classes on the fly though, most likely 50 | // you won't ever need instanceof against Mixins. 51 | if (has(Mixin, classes)) { 52 | Mixin[classes].push(Class); 53 | } else if (!has(Mixin, hasInstance)) { 54 | define(Mixin, Class, {}); 55 | } 56 | } 57 | return Class; 58 | } 59 | }; 60 | } 61 | exports.endow = endow 62 | 63 | // order matters. In case of a fallback to same symbol 64 | // the Symbol.hasInstance is ignored/overwritten 65 | function define(Mixin, Class, descriptors) { 66 | descriptors[hasInstance] = descriptor; 67 | descriptors[classes] = {value: [Class]}; 68 | Object.defineProperties(Mixin, descriptors); 69 | } 70 | 71 | // minifier friendly shortcut 72 | function has(object, value) { 73 | return object.hasOwnProperty(value); 74 | } 75 | 76 | // handy array.some(...) helper 77 | function instanceOf(Class) { 78 | return this instanceof Class; 79 | } 80 | -------------------------------------------------------------------------------- /coverage/coverage.json: -------------------------------------------------------------------------------- 1 | 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203 | .ignore-none { color: #999; font-weight: normal; } 204 | 205 | .wrapper { 206 | min-height: 100%; 207 | height: auto !important; 208 | height: 100%; 209 | margin: 0 auto -48px; 210 | } 211 | .footer, .push { 212 | height: 48px; 213 | } 214 | -------------------------------------------------------------------------------- /coverage/lcov-report/endow/cjs/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Code coverage report for endow/cjs/ 5 | 6 | 7 | 8 | 9 | 14 | 15 | 16 |
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'use strict';
205 | /*! (c) Andrea Giammarchi, @WebReflection (ISC) */
206 | // inspired by https://github.com/justinfagnani/mixwith.js#mixwith
207 |  
208 | // If not available, Symbol could even be a special `String` here
209 | var classes = Symbol('endow');
210 |  
211 | // fallback to same symbol, ignore hasInstance completely
212 | // in this case code will be transpiled and the result
213 | // of every instanceof will be simply false
214 | var hasInstance = Symbol.hasInstance || classes;
215 |  
216 | // Symbol.hasInstance descriptor is always the same
217 | // no need to pollute GC with useless garbage
218 | var descriptor = {
219 |   configurable: true,
220 |   value: function (object) {
221 |     return this[classes].some(instanceOf, object);
222 |   }
223 | };
224 |  
225 | // endow can be imported as default or as {endow}
226 | Object.defineProperty(exports, '__esModule', {value: true}).default = endow;
227 | function endow(Super) {
228 |   return {
229 |     // IE < 9 might throw with code that uses `{with: ...}`
230 |     "with": function () {
231 |       for (var
232 |         Mixin,
233 |         Class = Super,
234 |         i = 0, length = arguments.length; i < length; i++
235 |       ) {
236 |         Mixin = arguments[i];
237 |         Class = Mixin(Class);
238 |         // A Mixin knows all classes it extended.
239 |         // there is no iterable WeakSet to do this,
240 |         // so derived classes are retained once.
241 |         // This should not be a real-world issue
242 |         // because classes are usually a pre-defined,
243 |         // well known, amount.
244 |         // If you create a lot of classes on the fly though,
245 |         // and you'd like to use endow, be sure you drain
246 |         // that Mixin list from time to time.
247 |         //
248 |         //  Object.getOwnPropertySymbols(Mixin)
249 |         //    .some(s => /\bendow\b/.test(String(s)) && Mixin[s].splice(0));
250 |         //
251 |         // Please note after that instanceof operations won't be reliable.
252 |         // If you create a lot of classes on the fly though, most likely
253 |         // you won't ever need instanceof against Mixins.
254 |         if (has(Mixin, classes)) {
255 |           Mixin[classes].push(Class);
256 |         } else if (!has(Mixin, hasInstance)) {
257 |           define(Mixin, Class, {});
258 |         }
259 |       }
260 |       return Class;
261 |     }
262 |   };
263 | }
264 | exports.endow = endow
265 |  
266 | // order matters. In case of a fallback to same symbol
267 | // the Symbol.hasInstance is ignored/overwritten
268 | function define(Mixin, Class, descriptors) {
269 |   descriptors[hasInstance] = descriptor;
270 |   descriptors[classes] = {value: [Class]};
271 |   Object.defineProperties(Mixin, descriptors);
272 | }
273 |  
274 | // minifier friendly shortcut
275 | function has(object, value) {
276 |   return object.hasOwnProperty(value);
277 | }
278 |  
279 | // handy array.some(...) helper
280 | function instanceOf(Class) {
281 |   return this instanceof Class;
282 | }
283 |  
285 |
286 |
287 |
288 | Code coverage 289 | generated by istanbul at Thu Mar 22 2018 12:18:43 GMT+0100 (CET) 290 |
291 | 292 | 293 | 300 | 301 | 302 | 303 | -------------------------------------------------------------------------------- /coverage/lcov-report/endow/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Code coverage report for endow/ 5 | 6 | 7 | 8 | 9 | 14 | 15 | 16 |
17 |
18 |

19 | all files endow/ 20 |

21 |
22 |
23 | 100% 24 | Statements 25 | 17/17 26 |
27 |
28 | 100% 29 | Branches 30 | 0/0 31 |
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33 | 100% 34 | Functions 35 | 2/2 36 |
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79 | Code coverage 80 | generated by istanbul at Thu Mar 22 2018 12:18:43 GMT+0100 (CET) 81 |
82 | 83 | 84 | 91 | 92 | 93 | 94 | -------------------------------------------------------------------------------- /coverage/lcov-report/endow/test.js.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Code coverage report for endow/test.js 5 | 6 | 7 | 8 | 9 | 14 | 15 | 16 |
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19 | all files / endow/ test.js 20 |

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134 |  
const {endow} = require('./cjs');
135 |  
136 | const M1 = Super => class M1 extends Super {};
137 | const M2 = Super => class M2 extends Super {};
138 | class A {}
139 | class B extends endow(A).with(M1) {}
140 | class C extends endow(A).with(M2) {}
141 | class D extends endow(A).with(M1, M2) {}
142 |  
143 | console.assert([
144 |   new B instanceof A,
145 |   new B instanceof M1,
146 |   new C instanceof A,
147 |   new C instanceof M2,
148 |   new D instanceof A,
149 |   new D instanceof M1,
150 |   new D instanceof M2,
151 |   !(new B instanceof M2),
152 |   !(new C instanceof M1)
153 | ].every(Boolean));
154 |  
155 | const M3 = Super => class M3 extends Super {};
156 | Object.defineProperty(M3, Symbol.hasInstance, {value() { return false; }});
157 | class Z extends endow(A).with(M1, M3) {}
158 |  
159 | console.assert([
160 |   new Z instanceof A,
161 |   new Z instanceof M1,
162 |   !(new Z instanceof M3)
163 | ].every(Boolean));
164 |  
165 | delete require.cache[require.resolve('./cjs')];
166 | global.Symbol = String;
167 | const {endow:ish} = require('./cjs');
168 |  
169 | const M4 = function (Super) {
170 |   return class M4 extends Super {};
171 | };
172 | class E extends ish(A).with(M4) {}
173 |  
174 | console.assert([
175 |   new E instanceof A,
176 |   !(new E instanceof M4)
177 | ].every(Boolean));
178 |  
180 |
181 |
182 |
183 | Code coverage 184 | generated by istanbul at Thu Mar 22 2018 12:18:43 GMT+0100 (CET) 185 |
186 | 187 | 188 | 195 | 196 | 197 | 198 | -------------------------------------------------------------------------------- /coverage/lcov-report/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Code coverage report for All files 5 | 6 | 7 | 8 | 9 | 14 | 15 | 16 |
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19 | / 20 |

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92 | Code coverage 93 | generated by istanbul at Thu Mar 22 2018 12:18:43 GMT+0100 (CET) 94 |
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-------------------------------------------------------------------------------- /coverage/lcov-report/sort-arrow-sprite.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/WebReflection/endow/e89bd2cfabd8522b0f6884e7e32f3e30e3f18192/coverage/lcov-report/sort-arrow-sprite.png -------------------------------------------------------------------------------- /coverage/lcov-report/sorter.js: -------------------------------------------------------------------------------- 1 | var addSorting = (function () { 2 | "use strict"; 3 | var cols, 4 | currentSort = { 5 | index: 0, 6 | desc: false 7 | }; 8 | 9 | // returns the summary table element 10 | function getTable() { return document.querySelector('.coverage-summary'); } 11 | // returns the thead element of the summary table 12 | function getTableHeader() { return getTable().querySelector('thead tr'); } 13 | // returns the tbody element of the summary table 14 | function getTableBody() { return getTable().querySelector('tbody'); } 15 | // returns the th element for nth column 16 | function getNthColumn(n) { return getTableHeader().querySelectorAll('th')[n]; } 17 | 18 | // loads all columns 19 | function loadColumns() { 20 | var colNodes = getTableHeader().querySelectorAll('th'), 21 | colNode, 22 | cols = [], 23 | col, 24 | i; 25 | 26 | for (i = 0; i < colNodes.length; i += 1) { 27 | colNode = colNodes[i]; 28 | col = { 29 | key: colNode.getAttribute('data-col'), 30 | sortable: !colNode.getAttribute('data-nosort'), 31 | type: colNode.getAttribute('data-type') || 'string' 32 | }; 33 | cols.push(col); 34 | if (col.sortable) { 35 | col.defaultDescSort = col.type === 'number'; 36 | colNode.innerHTML = colNode.innerHTML + ''; 37 | } 38 | } 39 | return cols; 40 | } 41 | // attaches a data attribute to every tr element with an object 42 | // of data values keyed by column name 43 | function loadRowData(tableRow) { 44 | var tableCols = tableRow.querySelectorAll('td'), 45 | colNode, 46 | col, 47 | data = {}, 48 | i, 49 | val; 50 | for (i = 0; i < tableCols.length; i += 1) { 51 | colNode = tableCols[i]; 52 | col = cols[i]; 53 | val = colNode.getAttribute('data-value'); 54 | if (col.type === 'number') { 55 | val = Number(val); 56 | } 57 | data[col.key] = val; 58 | } 59 | return data; 60 | } 61 | // loads all row data 62 | function loadData() { 63 | var rows = getTableBody().querySelectorAll('tr'), 64 | i; 65 | 66 | for (i = 0; i < rows.length; i += 1) { 67 | rows[i].data = loadRowData(rows[i]); 68 | } 69 | } 70 | // sorts the table using the data for the ith column 71 | function sortByIndex(index, desc) { 72 | var key = cols[index].key, 73 | sorter = function (a, b) { 74 | a = a.data[key]; 75 | b = b.data[key]; 76 | return a < b ? -1 : a > b ? 1 : 0; 77 | }, 78 | finalSorter = sorter, 79 | tableBody = document.querySelector('.coverage-summary tbody'), 80 | rowNodes = tableBody.querySelectorAll('tr'), 81 | rows = [], 82 | i; 83 | 84 | if (desc) { 85 | finalSorter = function (a, b) { 86 | return -1 * sorter(a, b); 87 | }; 88 | } 89 | 90 | for (i = 0; i < rowNodes.length; i += 1) { 91 | rows.push(rowNodes[i]); 92 | tableBody.removeChild(rowNodes[i]); 93 | } 94 | 95 | rows.sort(finalSorter); 96 | 97 | for (i = 0; i < rows.length; i += 1) { 98 | tableBody.appendChild(rows[i]); 99 | } 100 | } 101 | // removes sort indicators for current column being sorted 102 | function removeSortIndicators() { 103 | var col = getNthColumn(currentSort.index), 104 | cls = col.className; 105 | 106 | cls = cls.replace(/ sorted$/, '').replace(/ sorted-desc$/, ''); 107 | col.className = cls; 108 | } 109 | // adds sort indicators for current column being sorted 110 | function addSortIndicators() { 111 | getNthColumn(currentSort.index).className += currentSort.desc ? ' sorted-desc' : ' sorted'; 112 | } 113 | // adds event listeners for all sorter widgets 114 | function enableUI() { 115 | var i, 116 | el, 117 | ithSorter = function ithSorter(i) { 118 | var col = cols[i]; 119 | 120 | return function () { 121 | var desc = col.defaultDescSort; 122 | 123 | if (currentSort.index === i) { 124 | desc = !currentSort.desc; 125 | } 126 | sortByIndex(i, desc); 127 | removeSortIndicators(); 128 | currentSort.index = i; 129 | currentSort.desc = desc; 130 | addSortIndicators(); 131 | }; 132 | }; 133 | for (i =0 ; i < cols.length; i += 1) { 134 | if (cols[i].sortable) { 135 | // add the click event handler on the th so users 136 | // dont have to click on those tiny arrows 137 | el = getNthColumn(i).querySelector('.sorter').parentElement; 138 | if (el.addEventListener) { 139 | el.addEventListener('click', ithSorter(i)); 140 | } else { 141 | el.attachEvent('onclick', ithSorter(i)); 142 | } 143 | } 144 | } 145 | } 146 | // adds sorting functionality to the UI 147 | return function () { 148 | if (!getTable()) { 149 | return; 150 | } 151 | cols = loadColumns(); 152 | loadData(cols); 153 | addSortIndicators(); 154 | enableUI(); 155 | }; 156 | })(); 157 | 158 | window.addEventListener('load', addSorting); 159 | -------------------------------------------------------------------------------- /coverage/lcov.info: -------------------------------------------------------------------------------- 1 | TN: 2 | SF:/Users/agiammarchi/git/endow/test.js 3 | FN:23,(anonymous_1) 4 | FN:36,(anonymous_2) 5 | FNF:2 6 | FNH:2 7 | FNDA:1,(anonymous_1) 8 | FNDA:1,(anonymous_2) 9 | DA:1,1 10 | DA:3,3 11 | DA:4,2 12 | DA:10,1 13 | DA:22,1 14 | DA:23,1 15 | DA:26,1 16 | DA:32,1 17 | DA:33,1 18 | DA:34,1 19 | DA:36,1 20 | DA:37,1 21 | DA:41,1 22 | LF:13 23 | LH:13 24 | BRF:0 25 | BRH:0 26 | end_of_record 27 | TN: 28 | SF:/Users/agiammarchi/git/endow/cjs/index.js 29 | FN:17,(anonymous_1) 30 | FN:24,endow 31 | FN:27,(anonymous_3) 32 | FN:65,define 33 | FN:72,has 34 | FN:77,instanceOf 35 | FNF:6 36 | FNH:6 37 | FNDA:7,(anonymous_1) 38 | FNDA:5,endow 39 | FNDA:5,(anonymous_3) 40 | FNDA:3,define 41 | FNDA:11,has 42 | FNDA:13,instanceOf 43 | DA:6,2 44 | DA:11,2 45 | DA:15,2 46 | DA:18,7 47 | DA:23,2 48 | DA:24,1 49 | DA:25,5 50 | DA:28,5 51 | DA:33,7 52 | DA:34,7 53 | DA:51,7 54 | DA:52,3 55 | DA:53,4 56 | DA:54,3 57 | DA:57,5 58 | DA:61,2 59 | DA:65,1 60 | DA:66,3 61 | DA:67,3 62 | DA:68,3 63 | DA:72,1 64 | DA:73,11 65 | DA:77,1 66 | DA:78,13 67 | LF:24 68 | LH:24 69 | BRDA:11,1,0,2 70 | BRDA:11,1,1,1 71 | BRDA:51,2,0,3 72 | BRDA:51,2,1,4 73 | BRDA:53,3,0,3 74 | BRDA:53,3,1,1 75 | BRF:6 76 | BRH:6 77 | end_of_record 78 | -------------------------------------------------------------------------------- /esm/index.js: -------------------------------------------------------------------------------- 1 | /*! (c) Andrea Giammarchi, @WebReflection (ISC) */ 2 | // inspired by https://github.com/justinfagnani/mixwith.js#mixwith 3 | 4 | // If not available, Symbol could even be a special `String` here 5 | var classes = Symbol('endow'); 6 | 7 | // fallback to same symbol, ignore hasInstance completely 8 | // in this case code will be transpiled and the result 9 | // of every instanceof will be simply false 10 | var hasInstance = Symbol.hasInstance || classes; 11 | 12 | // Symbol.hasInstance descriptor is always the same 13 | // no need to pollute GC with useless garbage 14 | var descriptor = { 15 | configurable: true, 16 | value: function (object) { 17 | return this[classes].some(instanceOf, object); 18 | } 19 | }; 20 | 21 | // endow can be imported as default or as {endow} 22 | export default endow; 23 | export function endow(Super) { 24 | return { 25 | // IE < 9 might throw with code that uses `{with: ...}` 26 | "with": function () { 27 | for (var 28 | Mixin, 29 | Class = Super, 30 | i = 0, length = arguments.length; i < length; i++ 31 | ) { 32 | Mixin = arguments[i]; 33 | Class = Mixin(Class); 34 | // A Mixin knows all classes it extended. 35 | // there is no iterable WeakSet to do this, 36 | // so derived classes are retained once. 37 | // This should not be a real-world issue 38 | // because classes are usually a pre-defined, 39 | // well known, amount. 40 | // If you create a lot of classes on the fly though, 41 | // and you'd like to use endow, be sure you drain 42 | // that Mixin list from time to time. 43 | // 44 | // Object.getOwnPropertySymbols(Mixin) 45 | // .some(s => /\bendow\b/.test(String(s)) && Mixin[s].splice(0)); 46 | // 47 | // Please note after that instanceof operations won't be reliable. 48 | // If you create a lot of classes on the fly though, most likely 49 | // you won't ever need instanceof against Mixins. 50 | if (has(Mixin, classes)) { 51 | Mixin[classes].push(Class); 52 | } else if (!has(Mixin, hasInstance)) { 53 | define(Mixin, Class, {}); 54 | } 55 | } 56 | return Class; 57 | } 58 | }; 59 | } 60 | 61 | // order matters. In case of a fallback to same symbol 62 | // the Symbol.hasInstance is ignored/overwritten 63 | function define(Mixin, Class, descriptors) { 64 | descriptors[hasInstance] = descriptor; 65 | descriptors[classes] = {value: [Class]}; 66 | Object.defineProperties(Mixin, descriptors); 67 | } 68 | 69 | // minifier friendly shortcut 70 | function has(object, value) { 71 | return object.hasOwnProperty(value); 72 | } 73 | 74 | // handy array.some(...) helper 75 | function instanceOf(Class) { 76 | return this instanceof Class; 77 | } 78 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | var endow = (function () { 2 | /*! (c) Andrea Giammarchi, @WebReflection (ISC) */ 3 | // inspired by https://github.com/justinfagnani/mixwith.js#mixwith 4 | 5 | // If not available, Symbol could even be a special `String` here 6 | var classes = Symbol('endow'); 7 | 8 | // fallback to same symbol, ignore hasInstance completely 9 | // in this case code will be transpiled and the result 10 | // of every instanceof will be simply false 11 | var hasInstance = Symbol.hasInstance || classes; 12 | 13 | // Symbol.hasInstance descriptor is always the same 14 | // no need to pollute GC with useless garbage 15 | var descriptor = { 16 | configurable: true, 17 | value: function (object) { 18 | return this[classes].some(instanceOf, object); 19 | } 20 | }; 21 | 22 | // endow can be imported as default or as {endow} 23 | 24 | return function endow(Super) { 25 | return { 26 | // IE < 9 might throw with code that uses `{with: ...}` 27 | "with": function () { 28 | for (var 29 | Mixin, 30 | Class = Super, 31 | i = 0, length = arguments.length; i < length; i++ 32 | ) { 33 | Mixin = arguments[i]; 34 | Class = Mixin(Class); 35 | // A Mixin knows all classes it extended. 36 | // there is no iterable WeakSet to do this, 37 | // so derived classes are retained once. 38 | // This should not be a real-world issue 39 | // because classes are usually a pre-defined, 40 | // well known, amount. 41 | // If you create a lot of classes on the fly though, 42 | // and you'd like to use endow, be sure you drain 43 | // that Mixin list from time to time. 44 | // 45 | // Object.getOwnPropertySymbols(Mixin) 46 | // .some(s => /\bendow\b/.test(String(s)) && Mixin[s].splice(0)); 47 | // 48 | // Please note after that instanceof operations won't be reliable. 49 | // If you create a lot of classes on the fly though, most likely 50 | // you won't ever need instanceof against Mixins. 51 | if (has(Mixin, classes)) { 52 | Mixin[classes].push(Class); 53 | } else if (!has(Mixin, hasInstance)) { 54 | define(Mixin, Class, {}); 55 | } 56 | } 57 | return Class; 58 | } 59 | }; 60 | } 61 | 62 | // order matters. In case of a fallback to same symbol 63 | // the Symbol.hasInstance is ignored/overwritten 64 | function define(Mixin, Class, descriptors) { 65 | descriptors[hasInstance] = descriptor; 66 | descriptors[classes] = {value: [Class]}; 67 | Object.defineProperties(Mixin, descriptors); 68 | } 69 | 70 | // minifier friendly shortcut 71 | function has(object, value) { 72 | return object.hasOwnProperty(value); 73 | } 74 | 75 | // handy array.some(...) helper 76 | function instanceOf(Class) { 77 | return this instanceof Class; 78 | } 79 | }()); 80 | -------------------------------------------------------------------------------- /min.js: -------------------------------------------------------------------------------- 1 | var endow=function(){function n(n,t,e){e[o]=u,e[r]={value:[t]},Object.defineProperties(n,e)}function t(n,t){return n.hasOwnProperty(t)}function e(n){return this instanceof n}/*! (c) Andrea Giammarchi, @WebReflection (ISC) */ 2 | var r=Symbol("endow"),o=Symbol.hasInstance||r,u={configurable:!0,value:function(n){return this[r].some(e,n)}};return function(e){return{"with":function(){for(var u,i=e,c=0,f=arguments.length;cindex.js'", 11 | "cjs": "ascjs ./esm ./cjs", 12 | "coveralls": "cat ./coverage/lcov.info | coveralls", 13 | "min": "uglifyjs index.js --support-ie8 --comments=/^!/ -c -m -o min.js", 14 | "size": "cat index.js | wc -c;cat min.js | wc -c;gzip -c9 min.js | wc -c;cat min.js | brotli | wc -c && rm -f min.js.br", 15 | "test": "istanbul cover test.js" 16 | }, 17 | "repository": { 18 | "type": "git", 19 | "url": "git+https://github.com/WebReflection/endow.git" 20 | }, 21 | "keywords": [ 22 | "mixins", 23 | "interfaces", 24 | "classes", 25 | "multiple", 26 | "inheritance" 27 | ], 28 | "author": "Andrea Giammarchi", 29 | "license": "ISC", 30 | "bugs": { 31 | "url": "https://github.com/WebReflection/endow/issues" 32 | }, 33 | "homepage": "https://github.com/WebReflection/endow#readme", 34 | "devDependencies": { 35 | "ascjs": "^2.4.0", 36 | "coveralls": "^3.0.0", 37 | "istanbul": "^0.4.5", 38 | "uglify-js": "^2.8.29" 39 | } 40 | } 41 | -------------------------------------------------------------------------------- /test.js: -------------------------------------------------------------------------------- 1 | const {endow} = require('./cjs'); 2 | 3 | const M1 = Super => class M1 extends Super {}; 4 | const M2 = Super => class M2 extends Super {}; 5 | class A {} 6 | class B extends endow(A).with(M1) {} 7 | class C extends endow(A).with(M2) {} 8 | class D extends endow(A).with(M1, M2) {} 9 | 10 | console.assert([ 11 | new B instanceof A, 12 | new B instanceof M1, 13 | new C instanceof A, 14 | new C instanceof M2, 15 | new D instanceof A, 16 | new D instanceof M1, 17 | new D instanceof M2, 18 | !(new B instanceof M2), 19 | !(new C instanceof M1) 20 | ].every(Boolean)); 21 | 22 | const M3 = Super => class M3 extends Super {}; 23 | Object.defineProperty(M3, Symbol.hasInstance, {value() { return false; }}); 24 | class Z extends endow(A).with(M1, M3) {} 25 | 26 | console.assert([ 27 | new Z instanceof A, 28 | new Z instanceof M1, 29 | !(new Z instanceof M3) 30 | ].every(Boolean)); 31 | 32 | delete require.cache[require.resolve('./cjs')]; 33 | global.Symbol = String; 34 | const {endow:ish} = require('./cjs'); 35 | 36 | const M4 = function (Super) { 37 | return class M4 extends Super {}; 38 | }; 39 | class E extends ish(A).with(M4) {} 40 | 41 | console.assert([ 42 | new E instanceof A, 43 | !(new E instanceof M4) 44 | ].every(Boolean)); 45 | --------------------------------------------------------------------------------