wp-includes/class-wp-image-editor.php:315Returns the default compression quality setting for the mime type.
$mime_typestringint protected function get_default_quality( $mime_type ) { switch ( $mime_type ) { case 'image/webp': $quality = 86; break; case 'image/jpeg': default: $quality = $this->default_quality; } return $quality; }Introduced in 5.8.1. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-image-editor.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.