diff --git a/packages/angular/ssr/node/src/common-engine/common-engine.ts b/packages/angular/ssr/node/src/common-engine/common-engine.ts
index 079c1187696b..673156ee6b43 100644
--- a/packages/angular/ssr/node/src/common-engine/common-engine.ts
+++ b/packages/angular/ssr/node/src/common-engine/common-engine.ts
@@ -65,7 +65,7 @@ export class CommonEngine {
   private readonly inlineCriticalCssProcessor = new CommonEngineInlineCriticalCssProcessor();
   private readonly pageIsSSG = new Map<string, boolean>();
 
-  constructor(private options?: CommonEngineOptions) {
+  constructor(private options?: CommonEngineOptions | undefined) {
     attachNodeGlobalErrorHandlers();
   }
 
diff --git a/packages/angular/ssr/src/utils/redirect.ts b/packages/angular/ssr/src/utils/redirect.ts
index 7a65ff472a2a..18ca3f92b819 100644
--- a/packages/angular/ssr/src/utils/redirect.ts
+++ b/packages/angular/ssr/src/utils/redirect.ts
@@ -9,7 +9,7 @@
 /**
  * An set of HTTP status codes that are considered valid for redirect responses.
  */
-export const VALID_REDIRECT_RESPONSE_CODES = new Set([301, 302, 303, 307, 308]);
+export const VALID_REDIRECT_RESPONSE_CODES: Set<number> = new Set([301, 302, 303, 307, 308]);
 
 /**
  * Checks if the given HTTP status code is a valid redirect response code.
diff --git a/tests/angular_devkit/schematics/tools/file-system-engine-host/extra-properties/factory.ts b/tests/angular_devkit/schematics/tools/file-system-engine-host/extra-properties/factory.ts
index a238c3265089..813e23f50981 100644
--- a/tests/angular_devkit/schematics/tools/file-system-engine-host/extra-properties/factory.ts
+++ b/tests/angular_devkit/schematics/tools/file-system-engine-host/extra-properties/factory.ts
@@ -10,7 +10,7 @@
 import { SchematicContext, Tree } from '@angular-devkit/schematics';
 
 export default function (options: {}) {
-  return (tree: Tree, context: SchematicContext) => {
+  return (tree: Tree, context: SchematicContext): void => {
     // We pass information back to the test.
     tree.create(
       (context.schematic.description as any).extra, // tslint:disable-line:no-any
diff --git a/tests/angular_devkit/schematics/tools/file-system-engine-host/file-tasks/factory.ts b/tests/angular_devkit/schematics/tools/file-system-engine-host/file-tasks/factory.ts
index adb52eb0465e..354eba9f98cf 100644
--- a/tests/angular_devkit/schematics/tools/file-system-engine-host/file-tasks/factory.ts
+++ b/tests/angular_devkit/schematics/tools/file-system-engine-host/file-tasks/factory.ts
@@ -10,7 +10,7 @@
 import { SchematicContext, Tree } from '@angular-devkit/schematics';
 
 export default function () {
-  return (_: Tree, context: SchematicContext) => {
+  return (_: Tree, context: SchematicContext): void => {
     context.addTask({
       toConfiguration() {
         return { name: 'file-tasks/file-task.js' };
diff --git a/tests/angular_devkit/schematics/tools/file-system-engine-host/null-factory.ts b/tests/angular_devkit/schematics/tools/file-system-engine-host/null-factory.ts
index 2a1815478552..b8c081f1a12c 100644
--- a/tests/angular_devkit/schematics/tools/file-system-engine-host/null-factory.ts
+++ b/tests/angular_devkit/schematics/tools/file-system-engine-host/null-factory.ts
@@ -6,5 +6,5 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 export default function () {
-  return () => {};
+  return (): void => {};
 }