wp-includes/class-wp-script-modules.php:257Sets whether a script module should be printed in the footer.
$idstringbool public function set_in_footer( string $id, bool $in_footer ): bool { if ( ! isset( $this->registered[ $id ] ) ) { return false; } $this->registered[ $id ]['in_footer'] = $in_footer; return true; }Introduced in 6.9.0. Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/class-wp-script-modules.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.