Binding element 'index' implicitly has an 'any' type
for an object, you need to declare the type as
{index} : {index:any}
use any or specific type of the variable like ( numbers,string,etc )
public tabChanged(index:any): void { this.activeIndex = index;}
It is a check of the type script compiler. You can either remove the check or specify explicitly the any type in the declaration (answer from @Thyagu).In the tsconfig.json file, you could change the line
"noImplicitAny": false,to
"noImplicitAny": true,