A simple mutator module.
var ee = require('event-emitter');
var mut = require('mut');
var scope = mut(ee({}));
scope.on('change', function (key, value) {
var previous = scope.previous(key);
if (typeof value === 'object') value = JSON.stringify(value);
if (typeof previous === 'object') previous = JSON.stringify(previous);
console.log('Key "' + key + '" has changed from "' + previous + '" to "' + value + '"');
});
scope.set('a', 1);
scope.set('a', 1);
scope.set('a', 2);
scope.set('b', { payload : { index : 0 }});
scope.set('b', { payload : { index : 0 }});
scope.set('b', { payload : { index : 1 }});
// Key "a" has changed from "undefined" to "1"
// Key "a" has changed from "1" to "2"
// Key "b" has changed from "undefined" to "{"payload":{"index":0}}"
// Key "b" has changed from "{"payload":{"index":0}}" to "{"payload":{"index":1}}"See the unit tests for further information.
MIT