tiptap font size react

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.4.0/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.4.0/umd/react-dom.production.min.js"></script>

import { Extension } from '@tiptap/react';

/**
 * FontSize - Custom Extension
 * editor.commands.setFontSize(e.target.value) :set the font-size.
 */


 export const FontSize = Extension.create({
    name: 'fontSize',
    addOptions() {
        return {
            types: ['textStyle'],
        };
    },
    addGlobalAttributes() {
        return [
            {
                types: this.options.types,
                attributes: {
                    fontSize: {
                        default: null,
                        parseHTML: element => element.style.fontSize.replace(/['"]+/g, ''),
                        renderHTML: attributes => {
                            if (!attributes.fontSize) {
                                return {};
                            }
                            return {
                                style: `font-size: ${attributes.fontSize}`,
                            };
                        },
                    },
                },
            },
        ];
    },
    addCommands() {
        return {
            setFontSize: fontSize => ({ chain }) => {
                return chain()
                    .setMark('textStyle', { fontSize: fontSize + "px" })
                    .run();
            },
            unsetFontSize: () => ({ chain }) => {
                return chain()
                    .setMark('textStyle', { fontSize: null })
                    .removeEmptyTextStyle()
                    .run();
            },
        };
    },
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>