fix: Remove all instances of return undefined

Resolves #26

src/authentication/SimpleCredentialsExtractor.ts

@@ -7,13 +7,12 @@ import { HttpRequest } from '../server/HttpRequest';
  */
 export class SimpleCredentialsExtractor extends CredentialsExtractor {
   public async canHandle(): Promise<void> {
-    return undefined;
+    // Supports all requests
   }
 
   public async handle(input: HttpRequest): Promise<Credentials> {
     if (input.headers.authorization) {
       return { webID: input.headers.authorization };
     }
-    return undefined;
   }
 }

src/authorization/SimpleAuthorizer.ts

@@ -12,6 +12,6 @@ export class SimpleAuthorizer extends Authorizer {
   }
 
   public async handle(): Promise<void> {
-    return undefined;
+    // Allows all actions
   }
 }

src/ldp/http/AcceptPreferenceParser.ts

@@ -20,7 +20,7 @@ export class AcceptPreferenceParser extends PreferenceParser {
   }
 
   public async canHandle(): Promise<void> {
-    return undefined;
+    // Supports all HttpRequests
   }
 
   public async handle(input: HttpRequest): Promise<RepresentationPreferences> {

src/ldp/http/SimpleBodyParser.ts

@@ -32,7 +32,7 @@ export class SimpleBodyParser extends BodyParser {
     const contentType = input.headers['content-type'];
 
     if (!contentType) {
-      return undefined;
+      return;
     }
 
     const mediaType = contentType.split(';')[0];

src/ldp/permissions/SimplePermissionsExtractor.ts

@@ -7,7 +7,7 @@ import { PermissionsExtractor } from './PermissionsExtractor';
  */
 export class SimplePermissionsExtractor extends PermissionsExtractor {
   public async canHandle(): Promise<void> {
-    return undefined;
+    // Supports all operations
   }
 
   public async handle(input: Operation): Promise<PermissionSet> {

test/unit/server/ExpressHttpServer.test.ts

@@ -12,7 +12,7 @@ const handle = async(input: { request: HttpRequest; response: HttpResponse }): P
 
 class SimpleHttpHandler extends HttpHandler {
   public async canHandle(): Promise<void> {
-    return undefined;
+    // Supports all HttpRequests
   }
 
   public async handle(input: { request: HttpRequest; response: HttpResponse }): Promise<void> {