Extend WP-GraphQL to allow users/authors to be public. Useful to query all posts by Author.

gql-functions.php

/*
 * Extend WP-GraphQL to allow users/authors to be public. Useful to query all posts by Author.
 */
function enable_authors_public( $is_private, $model_name, $data, $visibility, $owner, $current_user ) {

    // Allow Users to be considered publicly queryable
	if ( 'UserObject' === $model_name ) {
		return false;
	}

	return $is_private;
}
add_filter( 'graphql_data_is_private', 'enable_authors_public', 10, 6 );