fix(react-router): explicitly set the default notFoundMode and upda…

…te the RouterOptions JSDoc comments (#2133)

* fix(react-router): set the default `notFoundMode` during instantiation

* docs: update `RouterOptions` with `notFoundMode` and `defaultViewTransition`

docs/framework/react/api/router/RouterOptionsType.md

@@ -126,6 +126,14 @@ The `RouterOptions` type accepts an object with the following properties and met
 - Optional
 - The default `onCatch` handler for errors caught by the Router ErrorBoundary
 
+### `defaultViewTransition` property
+
+- Type: `boolean`
+- Optional
+- If `true`, route navigations will called using `document.startViewTransition()`.
+- If the browser does not support this api, this option will be ignored.
+- See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/Document/startViewTransition) for more information on how this function works.
+
 ### `caseSensitive` property
 
 - Type: `boolean`
@@ -176,7 +184,8 @@ The `RouterOptions` type accepts an object with the following properties and met
 - Type: `React.Component`
 - Optional
 - A component that will be used to wrap the entire router. This is useful for providing a context to the entire router. Only non-DOM-rendering components like providers should be used, anything else will cause a hydration error.
-  **Example**
+
+**Example**
 
 ```tsx
 import { createRouter } from '@tanstack/react-router'
@@ -214,8 +223,16 @@ const router = createRouter({
 })
 ```
 
+### `notFoundMode` property
+
+- Type: `'root' | 'fuzzy'`
+- Optional
+- Defaults to `'fuzzy'`
+- This property controls how TanStack Router will handle scenarios where it cannot find a route to match the current location. See the [Not Found Errors guide](../../guide/not-found-errors.md) for more information.
+
 ### `notFoundRoute` property
 
+- **Deprecated**
 - Type: `NotFoundRoute`
 - Optional
 - A route that will be used as the default not found route for every branch of the route tree. This can be overridden on a per-branch basis by providing a not found route to the `NotFoundRoute` option on the root route of the branch.

packages/react-router/src/router.ts

@@ -249,10 +249,9 @@ export interface RouterOptions<
    */
   defaultPreloadStaleTime?: number
   /**
-   * Defaults to `routerOptions.defaultGcTime`, which defaults to 30 minutes.
-   *
    * The default `defaultPreloadGcTime` a route should use if no preloadGcTime is provided.
    *
+   * @default 1_800_000 `(30 minutes)`
    * @link [API Docs](https://tanstack.com/router/latest/docs/framework/react/api/router/RouterOptionsType#defaultpreloadgctime-property)
    * @link [Guide](https://tanstack.com/router/latest/docs/framework/react/guide/preloading)
    */
@@ -265,10 +264,18 @@ export interface RouterOptions<
    */
   defaultOnCatch?: (error: Error, errorInfo: React.ErrorInfo) => void
   /**
-   * If set to `true`, all navigation actions will wrapped in `document.startViewTransition()`.
+   * If `true`, route navigations will called using `document.startViewTransition()`.
+   *
+   * If the browser does not support this api, this option will be ignored.
+   *
+   * See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/Document/startViewTransition) for more information on how this function works.
+   *
+   * @link [API Docs](https://tanstack.com/router/latest/docs/framework/react/api/router/RouterOptionsType#defaultviewtransition-property)
    */
   defaultViewTransition?: boolean
   /**
+   * @default 'fuzzy'
+   * @link [API Docs](https://tanstack.com/router/latest/docs/framework/react/api/router/RouterOptionsType#notfoundmode-property)
    * @link [Guide](https://tanstack.com/router/latest/docs/framework/react/guide/not-found-errors#the-notfoundmode-option)
    */
   notFoundMode?: 'root' | 'fuzzy'
@@ -634,6 +641,7 @@ export class Router<
       defaultPendingMinMs: 500,
       context: undefined!,
       ...options,
+      notFoundMode: options.notFoundMode ?? 'fuzzy',
       stringifySearch: options.stringifySearch ?? defaultStringifySearch,
       parseSearch: options.parseSearch ?? defaultParseSearch,
       transformer: options.transformer ?? {