diff --git a/lib/pry/helpers/base_helpers.rb b/lib/pry/helpers/base_helpers.rb
index c1324e3a..0c4108b3 100644
--- a/lib/pry/helpers/base_helpers.rb
+++ b/lib/pry/helpers/base_helpers.rb
@@ -1,7 +1,149 @@
 module Pry::Helpers; end
+
+# rubocop:disable Metrics/ModuleLength
 module Pry::Helpers::BaseHelpers
   extend self
 
+  @mac_osx_warn = false
+  # @deprecated Use {Pry::Helpers::Platform.mac_osx?} instead.
+  def mac_osx?
+    unless @mac_osx_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: method BaseHelpers##{__method__} " \
+        "is deprecated. Use Pry:Helpers::Platform.#{__method__} instead"
+      )
+      @mac_osx_warn = true
+    end
+    Pry::Helpers::Platform.mac_osx?
+  end
+
+  @linux_warn = false
+  # @deprecated Use {Pry::Helpers::Platform.mac_osx?} instead.
+  def linux?
+    unless @linux_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: method BaseHelpers##{__method__} " \
+        "is deprecated. Use Pry:Helpers::Platform.#{__method__} instead"
+      )
+      @linux_warn = true
+    end
+    Pry::Helpers::Platform.linux?
+  end
+
+  @windows_warn = false
+  # @deprecated Use {Pry::Helpers::Platform.windows?} instead.
+  def windows?
+    unless @windows_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: method BaseHelpers##{__method__} " \
+        "is deprecated. Use Pry:Helpers::Platform.#{__method__} instead"
+      )
+      @windows_warn = true
+    end
+    Pry::Helpers::Platform.windows?
+  end
+
+  @windows_ansi_warn = false
+  # @deprecated Use {Pry::Helpers::Platform.windows_ansi?} instead.
+  def windows_ansi?
+    unless @windows_ansi_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: method BaseHelpers##{__method__} " \
+        "is deprecated. Use Pry:Helpers::Platform.#{__method__} instead"
+      )
+      @windows_ansi_warn = true
+    end
+    Pry::Helpers::Platform.windows_ansi?
+  end
+
+  @jruby_warn = false
+  # @deprecated Use {Pry::Helpers::Platform.jruby?} instead.
+  def jruby?
+    unless @jruby_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: method BaseHelpers##{__method__} " \
+        "is deprecated. Use Pry:Helpers::Platform.#{__method__} instead"
+      )
+      @jruby_warn = true
+    end
+    Pry::Helpers::Platform.jruby?
+  end
+
+  @jruby19_warn = false
+  # @deprecated Use {Pry::Helpers::Platform.jruby_19?} instead.
+  def jruby_19?
+    unless @jruby19_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: method BaseHelpers##{__method__} " \
+        "is deprecated. Use Pry:Helpers::Platform.#{__method__} instead"
+      )
+      @jruby19_warn = true
+    end
+    Pry::Helpers::Platform.jruby_19?
+  end
+
+  @mri_warn = false
+  # @deprecated Use {Pry::Helpers::Platform.mri?} instead.
+  def mri?
+    unless @mri_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: method BaseHelpers##{__method__} " \
+        "is deprecated. Use Pry:Helpers::Platform.#{__method__} instead"
+      )
+      @mri_warn = true
+    end
+    Pry::Helpers::Platform.mri?
+  end
+
+  @mri19_warn = false
+  # @deprecated Use {Pry::Helpers::Platform.mri_19?} instead.
+  def mri_19?
+    unless @mri19_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: method BaseHelpers##{__method__} " \
+        "is deprecated. Use Pry:Helpers::Platform.#{__method__} instead"
+      )
+      @mri19_warn = true
+    end
+    Pry::Helpers::Platform.mri_19?
+  end
+
+  @mri2_warn = false
+  # @deprecated Use {Pry::Helpers::Platform.mri_2?} instead.
+  def mri_2?
+    unless @mri2_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: method BaseHelpers##{__method__} " \
+        "is deprecated. Use Pry:Helpers::Platform.#{__method__} instead"
+      )
+      @mri2_warn = true
+    end
+    Pry::Helpers::Platform.mri_2?
+  end
+
+  @known_engines_warn = false
+  # @deprecated This will be removed in the next release.
+  def known_engines
+    unless @known_engines_warn
+      loc = caller_locations(1..1).first
+      warn(
+        "#{loc.path}:#{loc.lineno}: warning: BaseHelpers.#{__method__} is " \
+        "deprecated and will be removed in the next Pry release"
+      )
+      @known_engines_warn = true
+    end
+    [:jruby, :mri]
+  end
+
   def silence_warnings
     old_verbose = $VERBOSE
     $VERBOSE = nil
@@ -69,3 +211,4 @@ module Pry::Helpers::BaseHelpers
     end
   end
 end
+# rubocop:enable Metrics/ModuleLength