Implement RFC-391 (#18585)

lib/std/jsfetch.nim

@@ -1,9 +1,8 @@
 ## - Fetch for the JavaScript target: https://developer.mozilla.org/docs/Web/API/Fetch_API
-## .. Note:: jsfetch is Experimental. jsfetch module requires `-d:nimExperimentalJsfetch`
+## .. Note:: jsfetch is Experimental.
 when not defined(js):
   {.fatal: "Module jsfetch is designed to be used with the JavaScript backend.".}
 
-when defined(nimExperimentalJsfetch):
 import std/[asyncjs, jsheaders, jsformdata]
 from std/httpcore import HttpMethod
 from std/jsffi import JsObject
@@ -115,7 +114,7 @@ when defined(nimExperimentalJsfetch):
 func `$`*(self: Request | Response | Body | FetchOptions): string = $toCstring(self)
 
 
-runnableExamples("-d:nimExperimentalJsfetch -r:off"):
+runnableExamples("-r:off"):
   import std/[asyncjs, jsconsole, jsheaders, jsformdata]
   from std/httpcore import HttpMethod
   from std/jsffi import JsObject

tests/config.nims

@@ -33,7 +33,6 @@ hint("Processing", off)
 # experimental API's are enabled in testament, refs https://github.com/timotheecour/Nim/issues/575
 # sync with `kochdocs.docDefines` or refactor.
 switch("define", "nimExperimentalAsyncjsThen")
-switch("define", "nimExperimentalJsfetch")
 switch("define", "nimExperimentalLinenoiseExtra")
 
 switch("define", "nimPreviewFloatRoundtrip")

tools/kochdocs.nim

@@ -8,7 +8,7 @@ const
   gaCode* = " --doc.googleAnalytics:UA-48159761-1"
   # errormax: subsequent errors are probably consequences of 1st one; a simple
   # bug could cause unlimited number of errors otherwise, hard to debug in CI.
-  docDefines = "-d:nimExperimentalAsyncjsThen -d:nimExperimentalJsfetch -d:nimExperimentalLinenoiseExtra"
+  docDefines = "-d:nimExperimentalAsyncjsThen -d:nimExperimentalLinenoiseExtra"
   nimArgs = "--errormax:3 --hint:Conf:off --hint:Path:off --hint:Processing:off --hint:XDeclaredButNotUsed:off --warning:UnusedImport:off -d:boot --putenv:nimversion=$# $#" % [system.NimVersion, docDefines]
   gitUrl = "https://github.com/nim-lang/Nim"
   docHtmlOutput = "doc/html"