Add signature file for Routing

Author: nojaf

src/client/fsharp/FantomasTools.fsproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net10.0</TargetFramework>
     <AssemblyName>FantomasTools.Client</AssemblyName>
@@ -10,6 +10,7 @@
     <Compile Include="../../shared/OakShared.fs" />
     <Compile Include="../../shared/ASTViewerShared.fs" />
     <Compile Include="../../shared/FantomasOnlineShared.fs" />
+    <Compile Include="Routing.fsi" />
     <Compile Include="Routing.fs" />
     <Compile Include="Editor.fs" />
     <Compile Include="Style.fs" />

src/client/fsharp/Routing.fs

@@ -48,8 +48,6 @@ module private Parsing =
 
 [<RequireQualifiedAccess>]
 module Route =
-    /// Matches the query string segment of a route, so that `#/ast?data=xyz` can be
-    /// matched as `[ "ast"; Route.Query [ "data", data ] ]`.
     let (|Query|_|) (input: string) =
         if not (input.StartsWith "?") then
             None
@@ -65,13 +63,10 @@ module Route =
 
 [<RequireQualifiedAccess>]
 module Router =
-    /// The segments of the URL currently in the address bar.
     let currentUrl () : string list = Parsing.urlSegments window.location.hash
 
 [<AutoOpen>]
 module Components =
-    /// Renders `content` and reports the current route to `onUrlChanged`, both on mount and
-    /// whenever the hash changes.
     [<ReactComponent>]
     let RouteListener (onUrlChanged: string list -> unit) (content: ReactElement) : ReactElement =
         // The listeners are registered once, so they read the handler from a ref rather than

src/client/fsharp/Routing.fsi

@@ -0,0 +1,25 @@
+namespace FantomasTools.Client.Routing
+
+open System
+open Browser.Dom
+open Browser.Types
+open Fable.Core
+open Feliz
+
+[<RequireQualifiedAccess>]
+module Route =
+    /// Matches the query string segment of a route, so that `#/ast?data=xyz` can be
+    /// matched as `[ "ast"; Route.Query [ "data", data ] ]`.
+    val (|Query|_|): input: string -> (string * string) list option
+
+[<RequireQualifiedAccess>]
+module Router =
+    /// The segments of the URL currently in the address bar.
+    val currentUrl: unit -> string list
+
+[<AutoOpen>]
+module Components =
+    /// Renders `content` and reports the current route to `onUrlChanged`, both on mount and
+    /// whenever the hash changes.
+    [<ReactComponent>]
+    val RouteListener: onUrlChanged: (string list -> unit) -> content: ReactElement -> ReactElement