How do I insert text into a Monaco Editor?

Question

I have a monaco code editor embedded in my app.

How do I programmatically insert text on a particular line?

var editor = monaco.editor.create(document.getElementById("container"), {
    value: "// First line\nfunction hello() {\n\talert('Hello world!');\n}\n// Last line",
    language: "javascript",

    lineNumbers: false,
    roundedSelection: false,
    scrollBeyondLastLine: false,
    readOnly: false,
    theme: "vs-dark",
});
// how do I do this?
editor.insertText("FOO");

Answer 1

A more robust solution would be to use the Selection API instead of Position

var selection = editor.getSelection();
var id = { major: 1, minor: 1 };             
var text = "XXX";
var op = {identifier: id, range: selection, text: text, forceMoveMarkers: true};
editor.executeEdits("my-source", [op]);

If there is already a pre-selected text in the editor, the insert will replace it, which is in my opinion, the correct behavior.