angular · JeanMeche · Oct 1, 2026 · Oct 1, 2026
diff --git a/packages/compiler/src/jit_compiler_facade.ts b/packages/compiler/src/jit_compiler_facade.ts
@@ -109,7 +109,7 @@ import {makeBindingParser, parseTemplate} from './render3/view/template';
 import {ResourceLoader} from './resource_loader';
 import {DomElementSchemaRegistry} from './schema/dom_element_schema_registry';
 import {compileService} from './service_compiler';
-import {getJitStandaloneDefaultForVersion} from './util';
+import {getJitOnPushDefaultForVersion, getJitStandaloneDefaultForVersion} from './util';
 
 export class CompilerFacadeImpl implements CompilerFacade {
   FactoryTarget = FactoryTarget;
@@ -707,6 +707,8 @@ function convertDeclareComponentFacadeToMetadata(
       kind === R3TemplateDependencyKind.Directive || kind === R3TemplateDependencyKind.NgModule,
   );
 
+  const hasOnPushByDefault = getJitOnPushDefaultForVersion(decl.version);
+
   return {
     ...convertDeclareDirectiveFacadeToMetadata(decl, typeSourceSpan),
     template,
@@ -716,7 +718,9 @@ function convertDeclareComponentFacadeToMetadata(
       decl.viewProviders !== undefined ? new WrappedNodeExpr(decl.viewProviders) : null,
     animations: decl.animations !== undefined ? new WrappedNodeExpr(decl.animations) : null,
     defer,
-    changeDetection: decl.changeDetection ?? ChangeDetectionStrategy.OnPush,
+    changeDetection:
+      decl.changeDetection ??
+      (hasOnPushByDefault ? ChangeDetectionStrategy.OnPush : ChangeDetectionStrategy.Default),
     encapsulation: decl.encapsulation ?? ViewEncapsulation.Emulated,
     declarationListEmitMode: DeclarationListEmitMode.ClosureResolved,
     relativeContextFilePath: '',

diff --git a/packages/compiler/src/util.ts b/packages/compiler/src/util.ts
@@ -135,12 +135,9 @@ const _global: {[name: string]: any} = globalThis;
 export {_global as global};
 
 const V1_TO_18 = /^([1-9]|1[0-8])\./;
+const V1_TO_21 = /^([1-9]|1[0-9]|2[0-1])\./;
 
 export function getJitStandaloneDefaultForVersion(version: string): boolean {
-  if (version.startsWith('0.')) {
-    // 0.0.0 is always "latest", default is true.
-    return true;
-  }
   if (V1_TO_18.test(version)) {
     // Angular v2 - v18 default is false.
     return false;
@@ -150,6 +147,16 @@ export function getJitStandaloneDefaultForVersion(version: string): boolean {
   return true;
 }
 
+export function getJitOnPushDefaultForVersion(version: string): boolean {
+  if (V1_TO_21.test(version)) {
+    // Angular v2 - v21 default is false.
+    return false;
+  }
+
+  // All other Angular versions (v22+) default to true.
+  return true;
+}
+
 /**
  * Namespaces a CSS variable name and validates its syntax.
  *

diff --git a/packages/compiler/test/util_spec.ts b/packages/compiler/test/util_spec.ts
@@ -6,7 +6,14 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
-import {escapeRegExp, splitAtColon, stringify, utf8Encode} from '../src/util';
+import {
+  escapeRegExp,
+  getJitOnPushDefaultForVersion,
+  getJitStandaloneDefaultForVersion,
+  splitAtColon,
+  stringify,
+  utf8Encode,
+} from '../src/util';
 
 describe('util', () => {
   describe('splitAtColon', () => {
@@ -86,4 +93,39 @@ describe('util', () => {
       expect(stringify(Object.create(null))).toEqual('object');
     });
   });
+
+  describe('getJitStandaloneDefaultForVersion', () => {
+    it('should return true for 0.0.0-PLACEHOLDER (starts with 0.)', () => {
+      expect(getJitStandaloneDefaultForVersion('0.0.0-PLACEHOLDER')).toBe(true);
+    });
+
+    it('should return false for versions 1 through 18', () => {
+      expect(getJitStandaloneDefaultForVersion('14.2.0')).toBe(false);
+      expect(getJitStandaloneDefaultForVersion('18.0.0')).toBe(false);
+      expect(getJitStandaloneDefaultForVersion('18.2.0')).toBe(false);
+    });
+
+    it('should return true for versions 19 and above', () => {
+      expect(getJitStandaloneDefaultForVersion('19.0.0')).toBe(true);
+      expect(getJitStandaloneDefaultForVersion('20.0.0')).toBe(true);
+    });
+  });
+
+  describe('getJitOnPushDefaultForVersion', () => {
+    it('should return true for 0.0.0-PLACEHOLDER (starts with 0.)', () => {
+      expect(getJitOnPushDefaultForVersion('0.0.0-PLACEHOLDER')).toBe(true);
+    });
+
+    it('should return false for versions 1 through 21', () => {
+      expect(getJitOnPushDefaultForVersion('14.2.0')).toBe(false);
+      expect(getJitOnPushDefaultForVersion('20.0.0')).toBe(false);
+      expect(getJitOnPushDefaultForVersion('21.0.0')).toBe(false);
+      expect(getJitOnPushDefaultForVersion('21.2.0')).toBe(false);
+    });
+
+    it('should return true for versions 22 and above', () => {
+      expect(getJitOnPushDefaultForVersion('22.0.0')).toBe(true);
+      expect(getJitOnPushDefaultForVersion('23.0.0')).toBe(true);
+    });
+  });
 });
diff --git a/packages/core/test/render3/jit/declare_component_spec.ts b/packages/core/test/render3/jit/declare_component_spec.ts
@@ -8,14 +8,14 @@
 
 import {core} from '@angular/compiler';
 import {
+  AbstractType,
   ChangeDetectionStrategy,
   Component,
   Directive,
   ElementRef,
   forwardRef,
   Pipe,
   Type,
-  AbstractType,
   ViewEncapsulation,
   ɵɵngDeclareComponent,
 } from '../../../src/core';
@@ -306,6 +306,7 @@ describe('component declaration jit compilation', () => {
       version: '18.0.0',
       type: TestClass,
       template: '<div></div>',
+      changeDetection: ChangeDetectionStrategy.OnPush,
     }) as ComponentDef<TestClass>;
 
     expectComponentDef(def, {