docs(no-navigation-without-base): documented the new rule

Author: marekdedic

docs/rules/no-navigation-without-base.md

@@ -12,7 +12,9 @@ since: 'v2.36.0-next.9'
 
 ## :book: Rule Details
 
-This rule reports navigation using SvelteKit's `goto()` function without prefixing a relative URL with the base path. If a non-prefixed relative URL is used for navigation, the `goto` function navigates away from the base path, which is usually not what you wanted to do (for external URLs, `window.location = url` should be used instead).
+This rule reports navigation using HTML `<a>` tags, SvelteKit's `goto()`, `pushState()` and `replaceState()` functions without prefixing a relative URL with the base path. All four of these may be used for navigation, with `goto()`, `pushState()` and `replaceState()` being intended solely for iternal navigation (i.e. not leaving the site), while `<a>` tags may be used for both internal and external navigation. When using any way of internal navigation, the base path must be prepended, otherwise the site may break. For programmatic navigation to external URLs, using `window.location` is advised.
+
+This rule checks all 4 navigation options for the presence of the base path, with an exception for `<a>` links to absolute URLs, which are assumed to be used for external navigation and so do not require the base path, and for shallow outing functions with an empty string as the path, which keeps the current URL.
 
 <ESLintCodeBlock>
 
@@ -22,37 +24,69 @@ This rule reports navigation using SvelteKit's `goto()` function without prefixi
 <script>
   /* eslint svelte/no-navigation-without-base: "error" */
 
-  import { goto } from '$app/navigation';
+  import { goto, pushState, replaceState } from '$app/navigation';
   import { base } from '$app/paths';
-  import { base as baseAlias } from '$app/paths';
 
   // ✓ GOOD
   goto(base + '/foo/');
   goto(`${base}/foo/`);
 
-  goto(baseAlias + '/foo/');
-  goto(`${baseAlias}/foo/`);
+  pushState(base + '/foo/', {});
+  pushState(`${base}/foo/`, {});
+  pushState('', {});
 
-  goto('https://localhost/foo/');
+  replaceState(base + '/foo/', {});
+  replaceState(`${base}/foo/`, {});
+  replaceState('', {});
 
   // ✗ BAD
   goto('/foo');
-
   goto('/foo/' + base);
-  goto(`/foo/${base}`);
+
+  pushState('/foo', {});
+  replaceState('/foo', {});
 </script>
+
+<!-- ✓ GOOD -->
+<a href={base + '/foo/'}>Click me!</a>
+<a href={`${base}/foo/`}>Click me!</a>
+<a href="https://svelte.dev">Click me!</a>
+
+<!-- ✗ BAD -->
+<a href="/foo">Click me!</a>
+<a href={'/foo'}>Click me!</a>
 ```
 
 </ESLintCodeBlock>
 
 ## :wrench: Options
 
-Nothing.
+```json
+{
+  "svelte/no-navigation-without-base": [
+    "error",
+    {
+      "ignoreGoto": false,
+      "ignoreLinks": false,
+      "ignorePushState": false,
+      "ignoreReplaceState": false
+    }
+  ]
+}
+```
+
+- `ignoreGoto` ... Whether to ignore all `goto()` calls. Default `false`.
+- `ignoreLinks` ... Whether to ignore all `<a>` tags. Default `false`.
+- `ignorePushState` ... Whether to ignore all `pushState()` calls. Default `false`.
+- `ignoreReplaceState` ... Whether to ignore all `replaceState()` calls. Default `false`.
 
 ## :books: Further Reading
 
-- [`goto()` documentation](https://kit.svelte.dev/docs/modules#$app-navigation-goto)
-- [`base` documentation](https://kit.svelte.dev/docs/modules#$app-paths-base)
+- [`base` documentation](https://svelte.dev/docs/kit/$app-paths#base)
+- [Shallow routing](https://svelte.dev/docs/kit/shallow-routing)
+- [`goto()` documentation](https://svelte.dev/docs/kit/$app-navigation#goto)
+- [`pushState()` documentation](https://svelte.dev/docs/kit/$app-navigation#pushState)
+- [`replaceState()` documentation](https://svelte.dev/docs/kit/$app-navigation#replaceState)
 
 ## :rocket: Version