Wrapping function into a promise allows converting callback to await syntax.

A flag argument is a function argument of a boolean type that alters the function behaviour. Often but not always, a function caller decides what behaviour she wants by specifying the value for the flag. And if she does, it makes sense to review the API and determine if we need the flag argument.

TypeScript in version 4.4 switches from any to unknown type for catch variables in the strict mode resulting in unexpected compilation errors.

Making success unavoidable is the primary goal of the test-driven development process. This is a bold statement. And I back it in my article with four principles to follow to succeed with TDD (or at least improve your chances).