docs: Add NG0750 to errors list (#59265)

n0scible · thePunderWoman · commit 7e40ef2a82d0 · 2025-01-06T16:13:36.000Z
This PR adds error NG0750 to Error Encyclopedia. Update adev/src/content/reference/errors/NG0750.md Co-authored-by: Andrew Kushnir <43554145+AndrewKushnir@users.noreply.github.com> Update adev/src/content/reference/errors/NG0750.md Co-authored-by: Andrew Kushnir <43554145+AndrewKushnir@users.noreply.github.com> PR Close #59265
diff --git a/adev/src/app/sub-navigation-data.ts b/adev/src/app/sub-navigation-data.ts
@@ -1285,6 +1285,11 @@ const REFERENCE_SUB_NAVIGATION_DATA: NavigationItem[] = [
         path: 'errors/NG05000',
         contentPath: 'reference/errors/NG05000',
       },
+      {
+        label: 'NG0750: @defer dependencies failed to load',
+        path: 'errors/NG0750',
+        contentPath: 'reference/errors/NG0750',
+      },
       {
         label: 'NG6100: NgModule.id Set to module.id anti-pattern',
         path: 'errors/NG6100',
diff --git a/adev/src/content/reference/errors/NG0750.md b/adev/src/content/reference/errors/NG0750.md
@@ -0,0 +1,6 @@
+# @defer dependencies failed to load
+
+This error occurs when loading dependencies for a `@defer` block fails (typically due to poor network conditions) and no `@error` block has been configured to handle the failure state. Having no `@error` block in this scenario may create a poor user experience.
+
+## Debugging the error
+Verify that you added `@error` blocks to your `@defer` blocks to handle failure states.
diff --git a/adev/src/content/reference/errors/overview.md b/adev/src/content/reference/errors/overview.md
@@ -21,6 +21,7 @@
 | `NG0505`  | [No hydration info in server response](errors/NG0505)                                |
 | `NG0506`  | [NgZone remains unstable](errors/NG0506)                                             |
 | `NG0507`  | [HTML content was altered after SSR](errors/NG0507)                                  |
+| `NG0750`  | [@defer dependencies failed to load](errors/NG0750)                                  |
 | `NG0910`  | [Unsafe bindings on an iframe element](errors/NG0910)                                |
 | `NG0912`  | [Component ID generation collision](errors/NG0912)                                   |
 | `NG0955`  | [Track expression resulted in duplicated keys for a given collection](errors/NG0955) |
@@ -29,7 +30,7 @@
 | `NG01203` | [Missing value accessor](errors/NG01203)                                             |
 | `NG02200` | [Missing Iterable Differ](errors/NG02200)                                            |
 | `NG02800` | [JSONP support in HttpClient configuration](errors/NG02800)                          |
-| `NG05000`  | [Hydration with unsupported Zone.js instance.](errors/NG05000)                      |
+| `NG05000` | [Hydration with unsupported Zone.js instance.](errors/NG05000)                       |
 | `NG05104` | [Root element was not found.](errors/NG05104)                                        |
 
 ## Compiler errors
diff --git a/goldens/public-api/core/errors.api.md b/goldens/public-api/core/errors.api.md
@@ -29,7 +29,7 @@ export const enum RuntimeErrorCode {
     // (undocumented)
     CYCLIC_DI_DEPENDENCY = -200,
     // (undocumented)
-    DEFER_LOADING_FAILED = 750,
+    DEFER_LOADING_FAILED = -750,
     // (undocumented)
     DUPLICATE_DIRECTIVE = 309,
     // (undocumented)
diff --git a/packages/core/src/errors.ts b/packages/core/src/errors.ts
@@ -97,7 +97,7 @@ export const enum RuntimeErrorCode {
   MISSING_LOCALE_DATA = 701,
 
   // Defer errors (750-799 range)
-  DEFER_LOADING_FAILED = 750,
+  DEFER_LOADING_FAILED = -750,
 
   // standalone errors
   IMPORT_PROVIDERS_FROM_STANDALONE = 800,
