perf: improve type checking performance of Route.Link

packages/react-router/src/link.tsx

@@ -465,20 +465,25 @@ export type LinkComponent<
   props: LinkComponentProps<TComp, TRouter, TFrom, TTo, TMaskFrom, TMaskTo>,
 ) => React.ReactElement
 
-export type LinkComponentRoute<in out TDefaultFrom extends string = string> = <
-  TRouter extends AnyRouter = RegisteredRouter,
-  const TTo extends string | undefined = undefined,
-  const TMaskTo extends string = '',
->(
-  props: LinkComponentProps<
-    'a',
-    TRouter,
-    TDefaultFrom,
-    TTo,
-    TDefaultFrom,
-    TMaskTo
-  >,
-) => React.ReactElement
+export interface LinkComponentRoute<
+  in out TDefaultFrom extends string = string,
+> {
+  defaultFrom: TDefaultFrom
+  <
+    TRouter extends AnyRouter = RegisteredRouter,
+    const TTo extends string | undefined = undefined,
+    const TMaskTo extends string = '',
+  >(
+    props: LinkComponentProps<
+      'a',
+      TRouter,
+      this['defaultFrom'],
+      TTo,
+      this['defaultFrom'],
+      TMaskTo
+    >,
+  ): React.ReactElement
+}
 
 export function createLink<const TComp>(
   Comp: Constrain<TComp, any, (props: CreateLinkProps) => ReactNode>,

packages/react-router/src/route.tsx

@@ -53,8 +53,8 @@ declare module '@tanstack/router-core' {
   }
 
   export interface RouteExtensions<
-    TId extends string,
-    TFullPath extends string,
+    in out TId extends string,
+    in out TFullPath extends string,
   > {
     useMatch: UseMatchRoute<TId>
     useRouteContext: UseRouteContextRoute<TId>

packages/router-core/src/link.ts

@@ -23,9 +23,7 @@ import type {
   MakeDifferenceOptional,
   NoInfer,
   NonNullableUpdater,
-  PickRequired,
   Updater,
-  WithoutEmpty,
 } from './utils'
 import type { ParsedLocation } from './location'
 
@@ -469,11 +467,11 @@ type MakeRequiredParamsReducer<
 > =
   | (string extends TFrom
       ? never
-      : ResolveFromParams<TRouter, TParamVariant, TFrom> extends WithoutEmpty<
-            PickRequired<
-              ResolveRelativeToParams<TRouter, TParamVariant, TFrom, TTo>
-            >
-          >
+      : ResolveFromParams<
+            TRouter,
+            TParamVariant,
+            TFrom
+          > extends ResolveRelativeToParams<TRouter, TParamVariant, TFrom, TTo>
         ? true
         : never)
   | (ParamsReducer<TRouter, TParamVariant, TFrom, TTo> & {})

packages/router-core/src/redirect.ts

@@ -1,5 +1,4 @@
 import type { NavigateOptions } from './link'
-import type { RoutePaths } from './routeInfo'
 import type { AnyRouter, RegisteredRouter } from './router'
 import type { PickAsRequired } from './utils'
 
@@ -10,9 +9,9 @@ export type AnyRedirect = Redirect<any, any, any, any, any>
  */
 export type Redirect<
   TRouter extends AnyRouter = RegisteredRouter,
-  TFrom extends RoutePaths<TRouter['routeTree']> | string = '/',
-  TTo extends string | undefined = '.',
-  TMaskFrom extends RoutePaths<TRouter['routeTree']> | string = TFrom,
+  TFrom extends string = string,
+  TTo extends string | undefined = undefined,
+  TMaskFrom extends string = TFrom,
   TMaskTo extends string = '.',
 > = {
   href?: string
@@ -39,9 +38,9 @@ export type Redirect<
 
 export type ResolvedRedirect<
   TRouter extends AnyRouter = RegisteredRouter,
-  TFrom extends RoutePaths<TRouter['routeTree']> = '/',
+  TFrom extends string = string,
   TTo extends string = '',
-  TMaskFrom extends RoutePaths<TRouter['routeTree']> = TFrom,
+  TMaskFrom extends string = TFrom,
   TMaskTo extends string = '',
 > = PickAsRequired<
   Redirect<TRouter, TFrom, TTo, TMaskFrom, TMaskTo>,

packages/router-core/src/route.ts

@@ -442,7 +442,10 @@ export type ResolveFullPath<
   TPrefixed = RoutePrefix<TParentRoute['fullPath'], TPath>,
 > = TPrefixed extends RootRouteId ? '/' : TPrefixed
 
-export interface RouteExtensions<TId, TFullPath> {}
+export interface RouteExtensions<in out TId, in out TFullPath> {
+  id: TId
+  fullPath: TFullPath
+}
 
 export type RouteLazyFn<TRoute extends AnyRoute> = (
   lazyFn: () => Promise<LazyRoute>,
@@ -564,9 +567,7 @@ export interface Route<
   in out TChildren,
   in out TFileRouteTypes,
 > extends RouteExtensions<TId, TFullPath> {
-  fullPath: TFullPath
   path: TPath
-  id: TId
   parentRoute: TParentRoute
   children?: TChildren
   types: RouteTypes<

packages/router-core/src/router.ts

@@ -94,15 +94,15 @@ export type ControllablePromise<T = any> = Promise<T> & {
 
 export type InjectedHtmlEntry = Promise<string>
 
-export interface Register {
-  // router: Router
+export interface DefaultRegister {
+  router: AnyRouter
 }
 
-export type RegisteredRouter = Register extends {
-  router: infer TRouter extends AnyRouter
+export interface Register extends DefaultRegister {
+  // router: Router
 }
-  ? TRouter
-  : AnyRouter
+
+export type RegisteredRouter = Register['router']
 
 export type DefaultRemountDepsFn<TRouteTree extends AnyRoute> = (
   opts: MakeRemountDepsOptionsUnion<TRouteTree>,

packages/router-core/src/utils.ts

@@ -37,12 +37,12 @@ export type DeepPartial<T> = T extends object
     }
   : T
 
-export type MakeDifferenceOptional<TLeft, TRight> = Omit<
-  TRight,
-  keyof TLeft
-> & {
-  [K in keyof TLeft & keyof TRight]?: TRight[K]
-}
+export type MakeDifferenceOptional<TLeft, TRight> = keyof TLeft &
+  keyof TRight extends never
+  ? TRight
+  : Omit<TRight, keyof TLeft & keyof TRight> & {
+      [K in keyof TLeft & keyof TRight]?: TRight[K]
+    }
 
 // from https://stackoverflow.com/a/53955431
 // eslint-disable-next-line @typescript-eslint/naming-convention

packages/solid-router/src/link.tsx

@@ -522,20 +522,25 @@ export type LinkComponent<
   props: LinkComponentProps<TComp, TRouter, TFrom, TTo, TMaskFrom, TMaskTo>,
 ) => Solid.JSX.Element
 
-export type LinkComponentRoute<in out TDefaultFrom extends string = string> = <
-  TRouter extends AnyRouter = RegisteredRouter,
-  const TTo extends string | undefined = undefined,
-  const TMaskTo extends string = '',
->(
-  props: LinkComponentProps<
-    'a',
-    TRouter,
-    TDefaultFrom,
-    TTo,
-    TDefaultFrom,
-    TMaskTo
-  >,
-) => Solid.JSX.Element
+export interface LinkComponentRoute<
+  in out TDefaultFrom extends string = string,
+> {
+  defaultFrom: TDefaultFrom
+  <
+    TRouter extends AnyRouter = RegisteredRouter,
+    const TTo extends string | undefined = undefined,
+    const TMaskTo extends string = '',
+  >(
+    props: LinkComponentProps<
+      'a',
+      TRouter,
+      this['defaultFrom'],
+      TTo,
+      this['defaultFrom'],
+      TMaskTo
+    >,
+  ): Solid.JSX.Element
+}
 
 export function createLink<const TComp>(
   Comp: Constrain<TComp, any, (props: CreateLinkProps) => Solid.JSX.Element>,

packages/solid-router/src/route.tsx

@@ -53,8 +53,8 @@ declare module '@tanstack/router-core' {
   }
 
   export interface RouteExtensions<
-    TId extends string,
-    TFullPath extends string,
+    in out TId extends string,
+    in out TFullPath extends string,
   > {
     useMatch: UseMatchRoute<TId>
     useRouteContext: UseRouteContextRoute<TId>
@@ -132,13 +132,13 @@ export class RouteApi<
     return notFound({ routeId: this.id as string, ...opts })
   }
 
-  Link: LinkComponentRoute<RouteTypesById<TRouter, TId>['fullPath']> = (
+  Link: LinkComponentRoute<RouteTypesById<TRouter, TId>['fullPath']> = ((
     props,
   ) => {
     const router = useRouter()
     const fullPath = router.routesById[this.id as string].fullPath
     return <Link from={fullPath as never} {...props} />
-  }
+  }) as LinkComponentRoute<RouteTypesById<TRouter, TId>['fullPath']>
 }
 
 export class Route<
@@ -242,9 +242,9 @@ export class Route<
     return useNavigate({ from: this.fullPath })
   }
 
-  Link: LinkComponentRoute<TFullPath> = (props) => {
+  Link: LinkComponentRoute<TFullPath> = ((props) => {
     return <Link from={this.fullPath} {...props} />
-  }
+  }) as LinkComponentRoute<TFullPath>
 }
 
 export function createRoute<
@@ -427,9 +427,9 @@ export class RootRoute<
     return useNavigate({ from: this.fullPath })
   }
 
-  Link: LinkComponentRoute<'/'> = (props) => {
+  Link: LinkComponentRoute<'/'> = ((props) => {
     return <Link from={this.fullPath} {...(props as any)} />
-  }
+  }) as LinkComponentRoute<'/'>
 }
 
 export function createRouteMask<