Form tParams = Promise; export default async functionality Challenge( params : params: tParams ) const slug = await params; const productID = slug[one]; // other code right here FutureWarning: Downcasting habits in `switch` is deprecated and will be taken out in a very future Variation. To retain the previous habits, https://alphawireless.com/future-proofing-american-utilities-why-900-mhz-is-critical-for-utility-communications/