deprecation functions

[timreichen]

Reading #7325 (comment):
Is there a conventional way to deprecate functions in deno modules?
I think it would make sense to have deprecation warnings at runtime and It would be good to provide some kind of deprecation function in std for consistent deprecation warnings/logs?

Example:

import { deprecate } from "deno.land/std/fmt/deprecate.ts"

function myFunction() {
  deprecate(myFunction.name, myNewFunction.name)
  …
}

function myNewFunction() {
  …
}

Console

Deprecated: the myFunction function is deprecated. Use myNewFunction instead.

[timreichen]

close in favor of #7345