diff --git a/goldens/public-api/compiler-cli/compiler_options.md b/goldens/public-api/compiler-cli/compiler_options.md
index 106c43325ab..2125d3d7e9a 100644
--- a/goldens/public-api/compiler-cli/compiler_options.md
+++ b/goldens/public-api/compiler-cli/compiler_options.md
@@ -10,6 +10,22 @@ export interface BazelAndG3Options {
     generateDeepReexports?: boolean;
 }
 
+// @public
+export enum DiagnosticCategoryLabel {
+    Error = "error",
+    Suppress = "suppress",
+    Warning = "warning"
+}
+
+// @public
+export interface DiagnosticOptions {
+    extendedDiagnostics?: {
+        checks?: {
+            [Name in ExtendedTemplateDiagnosticName]?: DiagnosticCategoryLabel;
+        };
+    };
+}
+
 // @public
 export interface I18nOptions {
     enableI18nLegacyMessageIdFormat?: boolean;
diff --git a/packages/compiler-cli/src/ngtsc/core/BUILD.bazel b/packages/compiler-cli/src/ngtsc/core/BUILD.bazel
index 7f00fa4479a..0dc379f3a5d 100644
--- a/packages/compiler-cli/src/ngtsc/core/BUILD.bazel
+++ b/packages/compiler-cli/src/ngtsc/core/BUILD.bazel
@@ -47,6 +47,7 @@ ts_library(
     name = "api",
     srcs = glob(["api/**/*.ts"]),
     deps = [
+        "//packages/compiler-cli/src/ngtsc/diagnostics",
         "//packages/compiler-cli/src/ngtsc/file_system",
         "//packages/compiler-cli/src/ngtsc/shims:api",
         "@npm//typescript",
diff --git a/packages/compiler-cli/src/ngtsc/core/api/src/options.ts b/packages/compiler-cli/src/ngtsc/core/api/src/options.ts
index 39f4d141ce2..923b0972272 100644
--- a/packages/compiler-cli/src/ngtsc/core/api/src/options.ts
+++ b/packages/compiler-cli/src/ngtsc/core/api/src/options.ts
@@ -8,7 +8,7 @@
 
 import ts from 'typescript';
 
-import {BazelAndG3Options, I18nOptions, LegacyNgcOptions, MiscOptions, NgcCompatibilityOptions, StrictTemplateOptions, TargetOptions} from './public_options';
+import {BazelAndG3Options, DiagnosticOptions, I18nOptions, LegacyNgcOptions, MiscOptions, NgcCompatibilityOptions, StrictTemplateOptions, TargetOptions} from './public_options';
 
 
 /**
@@ -53,6 +53,12 @@ export interface InternalOptions {
  * Also includes a few miscellaneous options.
  */
 export interface NgCompilerOptions extends ts.CompilerOptions, LegacyNgcOptions, BazelAndG3Options,
-                                           NgcCompatibilityOptions, StrictTemplateOptions,
-                                           TestOnlyOptions, I18nOptions, TargetOptions,
-                                           InternalOptions, MiscOptions {}
+                                           DiagnosticOptions, NgcCompatibilityOptions,
+                                           StrictTemplateOptions, TestOnlyOptions, I18nOptions,
+                                           TargetOptions, InternalOptions, MiscOptions {
+  // Replace the index signature type from `ts.CompilerOptions` as it is more strict than it needs
+  // to be and would conflict with some types from the other interfaces. This is ok because Angular
+  // compiler options are actually separate from TS compiler options in the `tsconfig.json` and we
+  // have full control over the structure of Angular's compiler options.
+  [prop: string]: any;
+}
diff --git a/packages/compiler-cli/src/ngtsc/core/api/src/public_options.ts b/packages/compiler-cli/src/ngtsc/core/api/src/public_options.ts
index 91da97d649a..765718eae74 100644
--- a/packages/compiler-cli/src/ngtsc/core/api/src/public_options.ts
+++ b/packages/compiler-cli/src/ngtsc/core/api/src/public_options.ts
@@ -6,6 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {ExtendedTemplateDiagnosticName} from '../../../../ngtsc/diagnostics';
+
 /**
  * Options supported by the legacy View Engine compiler, which are still consumed by the Angular Ivy
  * compiler for backwards compatibility.
@@ -258,6 +260,40 @@ export interface StrictTemplateOptions {
   strictLiteralTypes?: boolean;
 }
 
+/**
+ * A label referring to a `ts.DiagnosticCategory` or `'suppress'`, meaning the associated diagnostic
+ * should not be displayed at all.
+ *
+ * @publicApi
+ */
+export enum DiagnosticCategoryLabel {
+  /** Treat the diagnostic as a warning, don't fail the compilation. */
+  Warning = 'warning',
+
+  /** Treat the diagnostic as a hard error, fail the compilation. */
+  Error = 'error',
+
+  /** Ignore the diagnostic altogether. */
+  Suppress = 'suppress',
+}
+
+/**
+ * Options which control how diagnostics are emitted from the compiler.
+ *
+ * @publicApi
+ */
+export interface DiagnosticOptions {
+  /** Options which control how diagnostics are emitted from the compiler. */
+  extendedDiagnostics?: {
+    /**
+     * A map of each extended template diagnostic's name to its category. This can be expanded in
+     * the future with more information for each check or for additional diagnostics not part of the
+     * extended template diagnostics system.
+     */
+    checks?: {[Name in ExtendedTemplateDiagnosticName]?: DiagnosticCategoryLabel};
+  };
+}
+
 /**
  * Options which control behavior useful for "monorepo" build cases using Bazel (such as the
  * internal Google monorepo, g3).