Unable to set privacyDefaultMode using npm library

[KnuX]

While using the library piano-analytics-js in a NextJS project, privacyDefaultMode value is ignored. PA will load and set a "pa_privacy" cookie with "optin" value, confirmed by pa.getConfigurationMode('privacyDefaultMode').

This code from the documentation has no effect, even before the import line :

window._pac = window._pac || {}; 
_pac.cookieDomain = ".mysite.com"; 
_pac.privacyDefaultMode = "exempt";

<script 
  type="text/javascript" 
  crossorigin="anonymous" 
  src="https://tag.aticdn.net/piano-analytics.js" 
></script>;

If I replace the import line line by a script that injects in the head of the page the script 'https://tag.aticdn.net/piano-analytics.js', it's OK.

Maybe there is an other way to define default value for this library...