[ts-interface-generator ] Return type for the method "remove" for aggregation of cardinality 0 .. n does not match runtime behaviour

[AnsgarLichter]

Describe the bug
I was just having a look into OpenUI5 with TypeScript for a private project. I played around with custom controls.
I defined a custom aggreagation with multiple: true:

import Control from "sap/ui/core/Control";
import type { MetadataOptions } from "sap/ui/core/Element";
import RenderManager from "sap/ui/core/RenderManager";

/**
 * @namespace ui5.typescript.helloworld.control
 */
export default class MyControl extends Control {
    // The following three lines were generated and should remain as-is to make TypeScript aware of the constructor signatures
    constructor(idOrSettings?: string | $MyControlSettings);
    constructor(id?: string, settings?: $MyControlSettings);
    constructor(id?: string, settings?: $MyControlSettings) { super(id, settings); }
 
	static readonly metadata: MetadataOptions = {
		properties: {
			"text": "string"
		},
        aggregations: {
            "columns": { type: "sap.ui.core.Control", multiple: true},
        }
	};

	static renderer = {
		apiVersion: 2,
		render: function (rm: RenderManager, control: MyControl): void {
			rm.openStart("div", control);
			rm.openEnd();
			rm.text(control.getText());
			rm.close("div");
		}
	};

	onclick = function() {
		alert("Hello World!");
	}
}

This leads to the following generated interface:

export default interface MyControl {

        // property: text
        getText(): string;
        setText(text: string): this;

        // aggregation: columns
        getColumns(): Control[];
        addColumn(columns: Control): this;
        insertColumn(columns: Control, index: number): this;
        removeColumn(columns: number | string | Control): this;
        removeAllColumns(): Control[];
        indexOfColumn(columns: Control): number;
        destroyColumns(): this;
    }
}

Nevertheless during runtime the method insertColumn and ``removeColumn` return the inserted or removed element:

Expected behavior
The interface generator should generate the return type according to runtime behaviour:

 insertColumn(columns: Control, index: number): Control | undefined;
removeColumn(columns: number | string | myColumn): Control | undefined;

I checked with other aggregations with the cardinality 0 .. n. They have all the return type Type of Aggregation |null (see sap.ui.table.Table or sap.m.Page).

Additional context
I used version 0.8.3 of the module @ui5/ts-interface-generator and the following OpenUI5 version:

[akudev]

Hi @AnsgarLichter, I think you are right about removeXY - thanks for spotting this!

But for insertXY, "this" is indeed returned, no? You can see this e.g. for the "content" of a Panel: https://jsbin.com/hibahuk/1/edit?html,output
Also in your screenshot, "insertColumn" returns something with ID "_control0", which is the parent control (this), not the inserted one.

[AnsgarLichter]

Hi @akudev,

Yes you are right about insertXY, I oversaw this. Thanks for double-checking.

BR Ansgar

[akudev]

Fixed in 0.8.4 - thanks again.