/*
 * See https://make.wordpress.org/core/2017/10/22/code-editing-improvements-in-wordpress-4-9/
 */
add_action( 'admin_enqueue_scripts', function() {
    if ( 'profile' !== get_current_screen()->id ) {
        return;
    }
 
    // Enqueue code editor and settings for manipulating HTML.
    $settings = wp_enqueue_code_editor( array( 'type' => 'text/html' ) );
 
    // Bail if user disabled CodeMirror.
    if ( false === $settings ) {
        return;
    }
 
    wp_add_inline_script(
        'code-editor',
        sprintf(
            'jQuery( function() { wp.codeEditor.initialize( "description", %s ); } );',
            wp_json_encode( $settings )
        )
    );
} );