sample guttenberg block

sample-guttenberg-block.php

const { registerBlockType } = wp.blocks;

registerBlockType( 'my-plugin/hello-world', {
    title: 'Hello World',
    icon: 'smiley',
    category: 'common',
    edit: () => {
        return (
            <p>Hello World!</p>
        );
    },
    save: () => {
        return (
            <p>Hello World!</p>
        );
    },
} );