diff --git a/src/JLLWrappers.jl b/src/JLLWrappers.jl
index d885b77..0cfb94b 100644
--- a/src/JLLWrappers.jl
+++ b/src/JLLWrappers.jl
@@ -8,6 +8,8 @@ if VERSION >= v"1.6.0-DEV"
     using Preferences
 end
 
+const global_typeassert_available = VERSION >= v"1.9.0"
+
 # We need to glue expressions together a lot
 function excat(exs::Union{Expr,Nothing}...)
     ex = Expr(:block)
diff --git a/src/products/executable_generators.jl b/src/products/executable_generators.jl
index 105f990..cceffe6 100644
--- a/src/products/executable_generators.jl
+++ b/src/products/executable_generators.jl
@@ -29,8 +29,12 @@ function declare_old_executable_product(product_name)
             )
         end
 
-        # This will eventually be replaced with a `Ref{String}`
-        $(path_name) = ""
+
+        @static if $global_typeassert_available
+            $(path_name)::Union{String,Nothing} = ""
+        else
+            $(path_name) = ""
+        end
         function $(Symbol(string("get_", product_name, "_path")))()
             return $(path_name)::String
         end
diff --git a/src/products/file_generators.jl b/src/products/file_generators.jl
index 844c8cf..60c8602 100644
--- a/src/products/file_generators.jl
+++ b/src/products/file_generators.jl
@@ -3,8 +3,13 @@ macro declare_file_product(product_name)
     path_name = Symbol(string(product_name, "_path"))
     return esc(quote
         # These will be filled in by init_file_product().
-        $(path_name) = $(emit_preference_path_load(string(product_name, "_path")))
-        $(product_name) = ""
+        @static if $global_typeassert_available
+            $(product_name)::String = ""
+            $(path_name)::Union{Nothing,String} = $(emit_preference_path_load(string(product_name, "_path")))
+        else
+            $(product_name) = ""
+            $(path_name) = $(emit_preference_path_load(string(product_name, "_path")))
+        end
         function $(get_path_name)()
             return $(path_name)::String
         end
diff --git a/src/products/library_generators.jl b/src/products/library_generators.jl
index 4603c06..6a1c877 100644
--- a/src/products/library_generators.jl
+++ b/src/products/library_generators.jl
@@ -10,15 +10,24 @@ macro declare_library_product(product_name, product_soname)
     else
         lib_declaration = quote
             # On Julia 1.6+, this doesn't have to be `const`!  Thanks Jeff!
-            $(product_name) = ""
+            @static if $global_typeassert_available
+                $(product_name)::String = ""
+            else
+                $(product_name) = ""
+            end
         end
     end
-    
+
     return excat(
         quote
             # These will be filled in by init_library_product()
-            $(handle_name) = C_NULL
-            $(path_name) = $(emit_preference_path_load(string(product_name, "_path")))
+            @static if $global_typeassert_available
+                $(handle_name)::Ptr{Cvoid} = C_NULL
+                $(path_name)::Union{Nothing,String} = $(emit_preference_path_load(string(product_name, "_path")))
+            else
+                $(handle_name) = C_NULL
+                $(path_name) = $(emit_preference_path_load(string(product_name, "_path")))
+            end
             function $(get_path_name)()
                 return $(path_name)::String
             end
diff --git a/src/toplevel_generators.jl b/src/toplevel_generators.jl
index bb02eae..7295d37 100644
--- a/src/toplevel_generators.jl
+++ b/src/toplevel_generators.jl
@@ -115,7 +115,11 @@ function generate_wrapper_load(src_name, pkg_uuid, __source__)
     end
 
     return quote
-        global best_wrapper
+        @static if $global_typeassert_available
+            global best_wrapper::Union{Nothing,String}
+        else
+            global best_wrapper
+        end
         # Load Artifacts.toml file and select best platform at compile-time, since this is
         # running at toplevel, and therefore will be run completely at compile-time.  We use
         # a `let` block here to avoid storing unnecessary data in our `.ji` files
@@ -197,6 +201,7 @@ macro generate_main_file_header(src_name)
         generate_compiler_options(src_name),
         # import Artifacts module
         generate_imports(src_name),
+        global_typeassert_available ? :(global artifact_dir::String) : :()
     )
 end