SymbolMirror

Constructs an enumeration with symbols as values and keys, in addition to original keys.

Inspired by react/lib/keyMirror through https://github.com/STRML/keyMirror.

Useful when extending es6 classes to avoid overriding inherited methods.

Usage

npm install symbolMirror

var symbolMirror = require('symbolMirror');
var COLORS = keyMirror({blue: null, red: null});
var myColor = COLORS.blue;
var isColorValid = !!COLORS[myColor];

Last line is possible due to generated enum having keys as the same symbols as the original keys' values.

 
var symbolMirror = require('symbolMirror');
var actions = symbolMirror({myMethod: null});
 
class MyClass {
    myMethod(...args) {
        // do something with 'args'
    }
}
 
class MyExtendedClass extends MyClass {
    [actions.myMethod](...args) {
        //do something else with 'args'
    }
}

With keyMirror, the above would cause the original myMethod to be overriden, which is not always desired.

Input: {key1: val1, key2: val2}

Output: {key1: symbol1, key2: symbol2, symbol1: symbol1, symbol2: symbol2}