Angular is going to remove ngcc functionality in upcoming v16 which will drop support for all view engine libraries including this library.
@ngtools/webpack
NGCC integration has been removed and as a result Angular View Engine libraries will no longer work.
Changelog link -
Commit link - angular/angular-cli@c8ac660#diff-9c7ca60aad39fc0d92fc425a1e82ce3aa951179305575e44816323d1f57d110c
PR link - angular/angular-cli#24720