diff --git a/aio/content/examples/component-interaction/src/app/version-child.component.ts b/aio/content/examples/component-interaction/src/app/version-child.component.ts
index b3cecd6872..93ef079d5d 100644
--- a/aio/content/examples/component-interaction/src/app/version-child.component.ts
+++ b/aio/content/examples/component-interaction/src/app/version-child.component.ts
@@ -1,6 +1,6 @@
 /* tslint:disable:forin */
 // #docregion
-import { Component, Input, OnChanges, SimpleChange } from '@angular/core';
+import { Component, Input, OnChanges, SimpleChanges } from '@angular/core';
 
 @Component({
   selector: 'app-version-child',
@@ -17,7 +17,7 @@ export class VersionChildComponent implements OnChanges {
   @Input() minor: number;
   changeLog: string[] = [];
 
-  ngOnChanges(changes: {[propKey: string]: SimpleChange}) {
+  ngOnChanges(changes: SimpleChanges) {
     const log: string[] = [];
     for (const propName in changes) {
       const changedProp = changes[propName];
diff --git a/aio/content/examples/testing/src/app/demo/demo.ts b/aio/content/examples/testing/src/app/demo/demo.ts
index 5c02167ea3..94e936cb87 100644
--- a/aio/content/examples/testing/src/app/demo/demo.ts
+++ b/aio/content/examples/testing/src/app/demo/demo.ts
@@ -4,7 +4,7 @@ import { Component, ContentChildren, Directive, EventEmitter,
          HostBinding, HostListener,
          OnInit, OnChanges, OnDestroy,
          Pipe, PipeTransform,
-         SimpleChange } from '@angular/core';
+         SimpleChanges } from '@angular/core';
 
 import { of } from 'rxjs';
 import { delay } from 'rxjs/operators';
@@ -309,7 +309,7 @@ export class MyIfChildComponent implements OnInit, OnChanges, OnDestroy {
     this.changeLog.push('ngOnDestroy called');
   }
 
-  ngOnChanges(changes: {[propertyName: string]: SimpleChange}) {
+  ngOnChanges(changes: SimpleChanges) {
     for (const propName in changes) {
       this.ngOnChangesCounter += 1;
       const prop = changes[propName];