Type error with custom Handlers and PageProps

[shivjm]

This route:

const decoder = new TextDecoder("utf-8");
const css = decoder.decode(Deno.readFileSync("static/css/breaking-the-box.css"));

export const handler: Handlers = {
  GET(_req, ctx) {
    return ctx.render({ css });
  },
};

export default function BreakingTheBox(props: PageProps<{ css: string }>) {
 // …
}

Produces an error when type checking (and therefore when running deno compile):

error: TS2345 [ERROR]: Argument of type '{ routes: { "./routes/_app.tsx": typeof $0; "./routes/breaking-the-box.tsx": typeof $1; "./routes/css-whitespace-parsing/[seed]/[count].tsx": typeof $2; "./routes/css-whitespace-parsing/[seed]/[count]/css.tsx": typeof $3; "./routes/css-whitespace-parsing/[seed]/[count]/document.tsx": typeof $4; "./routes/health.tsx"...' is not assignable to parameter of type 'Manifest'.
  Types of property 'routes' are incompatible.
    Type '{ "./routes/_app.tsx": typeof $0; "./routes/breaking-the-box.tsx": typeof $1; "./routes/css-whitespace-parsing/[seed]/[count].tsx": typeof $2; "./routes/css-whitespace-parsing/[seed]/[count]/css.tsx": typeof $3; "./routes/css-whitespace-parsing/[seed]/[count]/document.tsx": typeof $4; "./routes/health.tsx": typeof $...' is not assignable to type 'Record<string, RouteModule | MiddlewareModule<any> | AppModule | ErrorPageModule | UnknownPageModule>'.
      Property '"./routes/breaking-the-box.tsx"' is incompatible with index signature.
        Type 'typeof import("file:///D:/Media/My/www/lab/routes/breaking-the-box.tsx")' is not assignable to type 'RouteModule | MiddlewareModule<any> | AppModule | ErrorPageModule | UnknownPageModule'.
          Type 'typeof import("file:///D:/Media/My/www/lab/routes/breaking-the-box.tsx")' is not assignable to type 'UnknownPageModule'.
            Types of property 'default' are incompatible.
              Type '(props: PageProps<any>) => Response | Element' is not assignable to type 'ComponentType<UnknownPageProps> | undefined'.
                Type '(props: PageProps<any>) => Response | Element' is not assignable to type 'FunctionComponent<UnknownPageProps>'.
                  Types of parameters 'props' and 'props' are incompatible.
                    Type 'RenderableProps<UnknownPageProps, any>' is missing the following properties from type 'PageProps<any>': params, data
await start(manifest, { plugins: [twindPlugin(twindConfig)], port: port ?? 8000 });

Am I typing the function incorrectly?