changes.php

<?php

class ADNA_HelloWorld extends ET_Builder_Module {

	public $slug       = 'adna_hello_world';
	public $vb_support = 'on';

	protected $module_credits = array(
		'module_uri' => '',
		'author'     => '',
		'author_uri' => '',
	);

	function init() {
		$this->name = esc_html__( 'Hello World', 'adna-adnan' );
		$this->settings_modal_toggles  = array(
			// Content tab's slug is "general"
			'general'  => array(
				'toggles' => array(
					'main_content' => esc_html__( 'Text', 'cotm-content-toggle-module' ),
				),
			),
		);
	}

	public function get_fields() {
		return array(
			'content' => array(
				'label'           => esc_html__( 'Content', 'adna-adnan' ),
				'type'            => 'tiny_mce',
				'option_category' => 'basic_option',
				'description'     => esc_html__( 'Content entered here will appear inside the module.', 'adna-adnan' ),
				'toggle_slug'     => 'main_content',
			),
		);
	}

	public function render( $attrs, $content = null, $render_slug ) {
		$the_content = $this->props['content'];
		return sprintf( '<h1>%1$s</h1>', $the_content );
	}
}

new ADNA_HelloWorld;