{.deprecated: [existsFile: fileExists].} (#14735)

* {.deprecated: [existsFile: fileExists].}

* s/existsFile/fileExists/ except under deps

* workaround pending #14819

* fix test

lib/system/nimscript.nim

@@ -131,15 +131,16 @@ proc fileExists*(filename: string): bool {.tags: [ReadIOEffect].} =
   ## Checks if the file exists.
   builtin
 
+template existsFile*(args: varargs[untyped]): untyped {.deprecated: "use fileExists".} =
+  # xxx: warning won't be shown for nimsscript because of current logic handling
+  # `foreignPackageNotes`
+  fileExists(args)
+
 proc dirExists*(dir: string): bool {.
   tags: [ReadIOEffect].} =
   ## Checks if the directory `dir` exists.
   builtin
 
-proc existsFile*(filename: string): bool =
-  ## An alias for ``fileExists``.
-  fileExists(filename)
-
 proc existsDir*(dir: string): bool =
   ## An alias for ``dirExists``.
   dirExists(dir)