Get/Restore Monaco editor Undo&Redo stack

Question

I want to create a system to store the Undo&Redo stack of the Monaco editor.

Why? : I have a Monaco instance where I do several changes. Then I have to dispose that instance and open a new one. Here, I want to restore the same stack state that I had in the previous instance.

Question : How can I get and restore the Undo&Redo stack ?

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UPDATE: When I dispose the Monaco editor instance, the JavaScript environment can be completely destroyed. It is integrated in a C# environment that is capable to communicate with JS . My goal is to store the Monaco Editor model in the C# or serialize it.

Answer 1

It all has to do with the Model.

If you restore the same model you will have the Undo&Redo stacks

See Example

var model = editorInstance.getModel();
var viewState = editorInstance.saveViewState();

//Destroy your instance for whatever reason
editorInstance.dispose();

//When you create the new instance load the model that you saved
var newInstance = monaco.editor.create(elem, options);
newInstance.setModel(model);
newInstance.restoreViewState(viewState);

Something that might help would be to tie into the monaco event hook

monaco.editor.onWillDisposeModel(saveModel)

The viewState can be used to resume the cursor position of the editor.

Answer 2

Here's the unofficial way:

const {past, future} = editor.getModel()._commandManager;

In your case you can then run JSON.stringify on past and future . Then when you recreate the editor you just do

const cm = editor.getModel()._commandManager;
cm.past = JSON.parse(past);
cm.future = JSON.parse(future);