wp-includes/class-wp-block-type-registry.php:170Checks if a block type is registered.
$namestring|nullbool public function is_registered( $name ) { return isset( $name, $this->registered_block_types[ $name ] ); }Introduced in 5.0.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$name retyped from string to string|null.verified against sourcesrc/wp-includes/class-wp-block-type-registry.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.