The compiler is flagging an issue:
An arithmetic operation should have a left-hand side of type 'any', 'number' or an enum type.
concerning the following code snippet:
import { map } from 'rxjs/operators';
const multiply = num => map(value => value * num);
Is there a solution to resolve this error ?
When the type of value is not specified, it leads to no inference for the T type parameter in the function map. As a result, T defaults to {}, causing an error when propagated back to value. To resolve this issue, you need to explicitly specify the type of value:
const multiply = number => map((value: number) => value * num);
(It is also recommended to specify the type of num, although it is not directly related to the current question.)
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