How to use the roosterjs-editor-types.ContentPosition.End function in roosterjs-editor-types

export const insertNode: InsertNode = (core: EditorCore, node: Node, option: InsertOption) => {
    option = option || {
        position: ContentPosition.SelectionStart,
        insertOnNewLine: false,
        updateCursor: true,
        replaceSelection: true,
    };
    let contentDiv = core.contentDiv;

    if (option.updateCursor) {
        core.api.focus(core);
    }

    switch (option.position) {
        case ContentPosition.Begin:
        case ContentPosition.End:
            let isBegin = option.position == ContentPosition.Begin;
            let block = getFirstLastBlockElement(contentDiv, isBegin);
            let insertedNode: Node;
            if (block) {
                let refNode = isBegin ? block.getStartNode() : block.getEndNode();
                if (
                    option.insertOnNewLine ||
                    refNode.nodeType == NodeType.Text ||
                    isVoidHtmlElement(refNode)
                ) {
                    // For insert on new line, or refNode is text or void html element (HR, BR etc.)
                    // which cannot have children, i.e. <div>hello<br>world</div>. 'hello', 'world' are the
                    // first and last node. Insert before 'hello' or after 'world', but still inside DIV
                    insertedNode = refNode.parentNode.insertBefore(
                        node,
                        isBegin ? refNode : refNode.nextSibling

// Otherwise, leave it as it is as we don't want to change the style for existing data
            // unless the block was just created by the keyboard event (e.g. ctrl+a & start typing)
            const shouldSetNodeStyles =
                isNodeEmpty(formatNode) ||
                (event && this.wasNodeJustCreatedByKeyboardEvent(event, formatNode));
            formatNode = formatNode && shouldSetNodeStyles ? formatNode : null;
        } else {
            // Only reason we don't get the selection block is that we have an empty content div
            // which can happen when users removes everything (i.e. select all and DEL, or backspace from very end to begin)
            // The fix is to add a DIV wrapping, apply default format and move cursor over
            formatNode = fromHtml(
                Browser.isEdge ? '<div><span><br></span></div>' : '<div><br></div>',
                this.editor.getDocument()
            )[0] as HTMLElement;
            this.editor.insertNode(formatNode, {
                position: ContentPosition.End,
                updateCursor: false,
                replaceSelection: false,
                insertOnNewLine: false,
            });

            // element points to a wrapping node we added "<div><br></div>". We should move the selection left to <br>
            result = new Position(formatNode.firstChild, PositionType.Begin);
        }

        if (formatNode) {
            applyFormat(formatNode, this.editor.getDefaultFormat(), this.editor.isDarkMode());
        }

        return result;
    }

export const insertNode: InsertNode = (core: EditorCore, node: Node, option: InsertOption) => {
    option = option || {
        position: ContentPosition.SelectionStart,
        insertOnNewLine: false,
        updateCursor: true,
        replaceSelection: true,
    };
    let contentDiv = core.contentDiv;

    if (option.updateCursor) {
        core.api.focus(core);
    }

    switch (option.position) {
        case ContentPosition.Begin:
        case ContentPosition.End: {
            let isBegin = option.position == ContentPosition.Begin;
            let block = getFirstLastBlockElement(contentDiv, isBegin);
            let insertedNode: Node;
            if (block) {
                let refNode = isBegin ? block.getStartNode() : block.getEndNode();
                if (
                    option.insertOnNewLine ||
                    refNode.nodeType == NodeType.Text ||
                    isVoidHtmlElement(refNode)
                ) {
                    // For insert on new line, or refNode is text or void html element (HR, BR etc.)
                    // which cannot have children, i.e. <div>hello<br>world</div>. 'hello', 'world' are the
                    // first and last node. Insert before 'hello' or after 'world', but still inside DIV
                    insertedNode = refNode.parentNode.insertBefore(
                        node,
                        isBegin ? refNode : refNode.nextSibling

public getStartInlineElement(): InlineElement {
        if (this.block) {
            switch (this.startFrom) {
                case ContentPosition.Begin:
                case ContentPosition.End:
                case ContentPosition.DomEnd:
                    return getFirstLastInlineElementFromBlockElement(
                        this.block,
                        this.startFrom == ContentPosition.Begin
                    );
                case ContentPosition.SelectionStart:
                    // Get the inline before selection start point, and ensure it falls in the selection block
                    let startInline = getInlineElementAfter(this.rootNode, this.position);
                    return startInline && this.block.contains(startInline.getContainerNode())
                        ? startInline
                        : new EmptyInlineElement(this.position, this.block);
            }
        }

        return null;
    }

                                onClick={() => this.setPosition(ContentPosition.End)}
                            />

<div>
                            <input id="insertBegin" checked="{this.state.position" name="position" type="radio"> this.setPosition(ContentPosition.Begin)}
                            /&gt;
                            <label>Begin</label>
                        </div>
                        <div>
                            <input id="insertEnd" checked="{this.state.position" name="position" type="radio"> this.setPosition(ContentPosition.End)}
                            /&gt;
                            <label>End</label>
                        </div>
                        <div>
                            <input id="insertSelectionStart" checked="{this.state.position" name="position" type="radio"> this.setPosition(ContentPosition.SelectionStart)}
                            /&gt;
                            <label>SelectionStart</label>
                        </div>
                        <div>
</div>