wp-includes/class-wp-scripts.php:816Whether a handle's source is in a default directory.
$srcstringbool public function in_default_dir( $src ) { if ( ! $this->default_dirs ) { return true; } if ( str_starts_with( $src, '/' . WPINC . '/js/l10n' ) ) { return false; } foreach ( (array) $this->default_dirs as $test ) { if ( str_starts_with( $src, $test ) ) { return true; } } return false; }Introduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-scripts.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.