Check type of launch config (#2125)

* Check type of launch config

* fix cargo check

* compile when using an explicit platform with other platforms enabled

* fix formatting

* fix overlapping TryIntoConfig implementations

* fix desktop headless tests

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/config-macro/src/lib.rs

@@ -15,7 +15,7 @@ pub fn server_only(input: TokenStream) -> TokenStream {
         }
     } else {
         quote! {
-            || {}
+            {}
         }
     }
     .into()
@@ -30,7 +30,7 @@ pub fn client(input: TokenStream) -> TokenStream {
         }
     } else {
         quote! {
-            || {}
+            {}
         }
     }
     .into()
@@ -45,7 +45,7 @@ pub fn web(input: TokenStream) -> TokenStream {
         }
     } else {
         quote! {
-            || {}
+            {}
         }
     }
     .into()
@@ -60,7 +60,22 @@ pub fn desktop(input: TokenStream) -> TokenStream {
         }
     } else {
         quote! {
-            || {}
+            {}
+        }
+    }
+    .into()
+}
+
+#[proc_macro]
+pub fn mobile(input: TokenStream) -> TokenStream {
+    if cfg!(feature = "mobile") {
+        let input = TokenStream2::from(input);
+        quote! {
+            #input
+        }
+    } else {
+        quote! {
+            {}
         }
     }
     .into()
@@ -75,7 +90,7 @@ pub fn fullstack(input: TokenStream) -> TokenStream {
         }
     } else {
         quote! {
-            || {}
+            {}
         }
     }
     .into()
@@ -90,7 +105,7 @@ pub fn ssr(input: TokenStream) -> TokenStream {
         }
     } else {
         quote! {
-            || {}
+            {}
         }
     }
     .into()
@@ -105,7 +120,7 @@ pub fn liveview(input: TokenStream) -> TokenStream {
         }
     } else {
         quote! {
-            || {}
+            {}
         }
     }
     .into()