diff --git a/@overflow/member/component/member-signup.component.ts b/@overflow/member/component/member-signup.component.ts
index 3dd634e..e13dce0 100644
--- a/@overflow/member/component/member-signup.component.ts
+++ b/@overflow/member/component/member-signup.component.ts
@@ -5,7 +5,7 @@ import {
   Output,
   EventEmitter,
 } from '@angular/core';
-import { FormGroup, FormBuilder, Validators, AbstractControl, FormControl } from '@angular/forms';
+import { FormGroup, FormBuilder, Validators, AbstractControl, FormControl, ValidationErrors } from '@angular/forms';
 import { Member } from '@overflow/commons-typescript/model/member';
 
 @Component({
@@ -92,7 +92,7 @@ export class MemberSignupComponent implements OnInit, OnDestroy {
     this.company = this.signupForm.controls['company'];
   }
 
-  pwMatchValidator(control: FormControl): { [s: string]: boolean } {
+  pwMatchValidator(control: FormControl): ValidationErrors {
     let pw;
     if (control.parent) {
       pw = control.parent.controls['password'].value;
@@ -100,6 +100,7 @@ export class MemberSignupComponent implements OnInit, OnDestroy {
     if (control.value !== pw) {
       return { notMatched: true };
     }
+    return null;
   }
 
   signupFormSubmit() {
diff --git a/src/app/commons/component/layout/menu/app.submenu.component.ts b/src/app/commons/component/layout/menu/app.submenu.component.ts
index ae451f2..8b0321c 100644
--- a/src/app/commons/component/layout/menu/app.submenu.component.ts
+++ b/src/app/commons/component/layout/menu/app.submenu.component.ts
@@ -44,7 +44,7 @@ export class AppSubMenuComponent {
 
     constructor(public app: PagesComponent) { }
 
-    itemClick(event: Event, item: MenuItem, index: number)  {
+    itemClick(event: Event, item: MenuItem, index: number): boolean  {
         if (this.root) {
             this.app.menuHoverActive = !this.app.menuHoverActive;
         }
@@ -83,6 +83,7 @@ export class AppSubMenuComponent {
             this.app.staticMenuMobileActive = false;
             this.app.menuHoverActive = !this.app.menuHoverActive;
         }
+        return false;
     }
 
     onMouseEnter(index: number) {
diff --git a/tsconfig.json b/tsconfig.json
index 6935ae0..af2a405 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -24,17 +24,25 @@
       "@app/*": [
         "src/app/*"
       ]
-    }
-    // /* Additional Checks */
+    },
+    /* Strict Type-Checking Options */
+    // "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */,
+    // "strictNullChecks": true /* Enable strict null checks. */,
+    // "strictFunctionTypes": true /* Enable strict checking of function types. */,
+    "strictPropertyInitialization": true /* Enable strict checking of property initialization in classes. */,
+    // "noImplicitThis": true /* Raise error on 'this' expressions with an implied 'any' type. */,
+    // "alwaysStrict": true /* Parse in strict mode and emit "use strict" for each source file. */,
+
+    /* Additional Checks */
     // "noUnusedLocals": true /* Report errors on unused locals. */,
     // "noUnusedParameters": true /* Report errors on unused parameters. */,
-    // "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
-    // "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,
+    "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
+    "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,
 
-    // /* Debugging Options */
-    // "traceResolution": false /* Report module resolution log messages. */,
-    // "listEmittedFiles": false /* Print names of generated files part of the compilation. */,
-    // "listFiles": false /* Print names of files part of the compilation. */,
-    // "pretty": true /* Stylize errors and messages using color and context. */,
+    /* Debugging Options */
+    "traceResolution": false /* Report module resolution log messages. */,
+    "listEmittedFiles": false /* Print names of generated files part of the compilation. */,
+    "listFiles": false /* Print names of files part of the compilation. */,
+    "pretty": true /* Stylize errors and messages using color and context. */,
   }
 }