Bug Report

We have migrated our codebase from 6.6.6 to 7.2.0 and have a an issue for mapTo(true) operator from eslint:

ESLint: Unsafe argument of type `OperatorFunction<any, boolean>` assigned to a parameter of type `OperatorFunction<DeleteResult, boolean>`.(@typescript-eslint/no-unsafe-argument)

Investigating the sources:

export function mapTo<R>(value: R): OperatorFunction<any, R>;
/** @deprecated Do not specify explicit type parameters. Signatures with type parameters that cannot be inferred will be removed in v8. */
export function mapTo<T, R>(value: R): OperatorFunction<T, R>;

Current Behavior
ESLint error is shown, without providing generics for mapTo operator.

Expected behavior
No ESLint errors, without additional generics for mapTo operator.

Reproduction

mapTo(true)

Environment

• Runtime: Node v16.1.0
• RxJS version: 7.2.0

Possible Solution
Seems like the problem is with any, changing the type to use generics, fixes the issue, and you can use it in your code without specifying them:

export declare function mapTo<T, R>(value: R): OperatorFunction<T, R>;