Angular

Implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly

Implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly, someone asked me to explain?
web
I got this following error "implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions.ts(7023)"
I can add the following code in tsconfig.ts. Disabling the feature is not good idea but angular not allowed to run the project it shows error. So that I added the code and executed fine.
"noImplicitAny": false,

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