JSON.iconv has been removed in json.

Author: ksss

stdlib/json/0/json.rbs

@@ -826,14 +826,6 @@ module JSON
 
   def self.generator=: (generator generator) -> void
 
-  # <!--
-  #   rdoc-file=ext/json/lib/json/common.rb
-  #   - iconv(to, from, string)
-  # -->
-  # Encodes string using String.encode.
-  #
-  def self.iconv: (encoding to, encoding from, String string) -> String
-
   # <!--
   #   rdoc-file=ext/json/lib/json/common.rb
   #   - JSON.load(source, proc = nil, options = {}) -> object

test/stdlib/json/JSON_test.rb

@@ -74,12 +74,6 @@ def test_generator=
     assert_send_type "(singleton(JSON::Ext::Generator)) -> void", JSON, :generator=, JSON::Ext::Generator
   end
 
-  def test_iconv
-    assert_send_type "(Encoding, Encoding, String) -> String", JSON, :iconv, Encoding::UTF_8, Encoding::UTF_16, "".encode(Encoding::UTF_16)
-    assert_send_type "(String, String, String) -> String", JSON, :iconv, 'UTF-8', 'UTF-16', "".encode(Encoding::UTF_16)
-    assert_send_type "(_ToStr, _ToStr, String) -> String", JSON, :iconv, JsonToStr.new('UTF-8'), JsonToStr.new('UTF-16'), "".encode(Encoding::UTF_16)
-  end
-
   def test_load
     assert_send_type "(String) -> 42", JSON, :load, "42"
     assert_send_type "(_ToStr) -> 42", JSON, :load, JsonToStr.new("42")