Monaco Add Suggestion from variables

So i want to make an ide using monaco, for my programming language.

I am using Microsoft's Monaco API, for JavaScript.

Now here is the code:

window.addIntellisense = (function(lbl, instrText, kind) {
        if(kind == "func") {
            window.suggestions.push({label: new RegExp(lbl, ""), kind: monaco.languages.CompletionItemKind.Function, insertText: instrText})
            console.log({label: new RegExp(lbl, ""), kind: monaco.languages.CompletionItemKind.Function, insertText: instrText})
            window.setMonarch();
        }else if(kind == "const") {
            window.suggestions.push({label: new RegExp(lbl, ""), kind: monaco.languages.CompletionItemKind.Constant, insertText: instrText})
            window.setMonarch();
        }else {
            console.error("kinderror")
        }
    })

The problem is when i use it, no errors as soon as i type one letter i get the error:

Uncaught Error: can't assign to property "range" on "[": not an object

Edit: Okay so instead of += i am now using push and now i get: Uncaught Error: this.textLabel is undefined