Get terms by taxonomy for select control option groups

index.tsx

import { __ } from "@wordpress/i18n";
import { InspectorControls } from "@wordpress/block-editor";
import { SelectControl } from "@wordpress/components";
import { registerBlockType } from "@wordpress/blocks";
import { useSelect } from "@wordpress/data";
import { useState } from "@wordpress/element";

interface selectOption {
	value: string,
	name: string
}

interface optionGroups {
	[label: string]: selectOption[]
}

registerBlockType( 'blockify/taxonomies', {
	name: 'blockify/taxonomies',
	title: 'Taxonomies',
	category: 'blockify',
	icon: 'tag',
	attributes: {},
	edit: ( props: blockProps ) => {

		const [ selected, setSelected ] = useState( '' );

		const { optionGroups } = useSelect<{ optionGroups: optionGroups }>( ( select ) => {

			const taxonomies: Array<{ [key: string]: any }> = select( 'core' ).getTaxonomies( { per_page: -1 } );

			const selectOptions: optionGroups = {};

			taxonomies?.forEach( taxonomy => {
				const terms: Array<{ [key: string]: string }> = select( 'core' ).getEntityRecords( 'taxonomy', taxonomy.slug, { per_page: -1 } );

				terms?.forEach( term => {
					if ( ! selectOptions[taxonomy.name] ) {
						selectOptions[taxonomy.name] = [];
					}

					selectOptions[taxonomy.name].push( {
						value: term.id,
						name: term.name
					} );
				} );

			} );

			return {
				optionGroups: selectOptions
			}
		} ) ?? {};

		return <>
			<div>
				{ selected ?? __( 'Select taxonomy' ) }
			</div>
			<InspectorControls>
				<SelectControl
					label={ __( 'Select taxonomy', 'blockify' ) }
					value={ selected }
					onChange={ ( selection ) => {
						setSelected( selection )
					} }
				>
					{ Object?.keys( optionGroups ?? {} )?.map( group => (
						<optgroup label={ group }>
							{ optionGroups[group].map( ( option: selectOption ) => (
								<option value={ option.value }>{ option.name }</option>
							) ) }
						</optgroup>
					) ) }

				</SelectControl>
			</InspectorControls>

		</>;

	},
	save: ( props ) => {

	}
} );