A simple undo/redo library with optional undo chunking (batch undos) and a pluggable logger with nice output for your viewing pleasure.
var History = require('undo-stack');
var history = new History({
logger: console.log,
limit: 200
});
var x = 5;
// To add a history step
history.add({
name: 'plus 3',
redo: function () { x += 3; },
undo: function () { x -= 3; }
}); // x is still 5
// To add and call use .do()
// shortcut for .add(stackStepObj, true)
history.do({
name: 'call on add',
redo: function () { x += 3; },
undo: function () { x -= 3; }
}); // x is 8 now
history
.undo() // x is 5
.redo(); // x is 8 again
// Chunks
history.startChunk('plus 7')
.do({
name: 'plus 2',
redo: function () {x += 2;},
undo: function () {x -= 2;}
}) // x is 10
.do({
name: 'plus 5',
redo: function () {x += 5;},
undo: function () {x -= 5;}
}) // x is 15
.endChunk();
history
.undo() // x is 8
.redo(); // x is 15 againMIT