[Error] Creating Abstract Factory

* error TS2511: Cannot create an instance of an abstract class.

Author: qvil

README.md

@@ -29,6 +29,10 @@ npm install
 npm start
 ```
 
+## Reference
+
+https://sourcemaking.com/design_patterns
+
 ## Abstract Factory
 
 ## Factory Method

package.json

@@ -8,6 +8,7 @@
   "license": "MIT",
   "scripts": {
     "start": "tsc-watch --onSuccess \"node dist/index.js\"",
+    "start:abstract-factory": "tsc-watch --onSuccess \"node dist/index.js\"",
     "test": "jest --watch"
   },
   "dependencies": {

src/abstract-factory/book-store.ts

@@ -0,0 +1,36 @@
+/**
+ * Book Factory
+ */
+abstract class AbstractBookFactory {
+  abstract createJSBook(): AbstractJSBook;
+  // abstract createTSBook(): AbstractTSBook;
+}
+
+class QvilBookFactory extends AbstractBookFactory {
+  createJSBook() {
+    return new AbstractJSBook(); // error TS2511: Cannot create an instance of an abstract class.
+  }
+  createTSBook() {
+    return "ts";
+  }
+}
+
+/**
+ * Book
+ */
+abstract class AbstractBook {
+  abstract getAuthor(): string;
+  abstract getTitle(): string;
+}
+abstract class AbstractJSBook extends AbstractBook {
+  // constructor(value: string) {
+  //   super();
+  //   console.log(value);
+  // }
+
+  getTitle() {
+    return this.title;
+  }
+
+  private title = "Javscript";
+}

src/abstract-factory/index.ts

@@ -0,0 +1,3 @@
+import book from "./book-store";
+
+console.log(book);

src/index.ts

@@ -1,3 +1,7 @@
-import { sum } from "./closure/ScopeChain";
+// import { sum } from "./closure/ScopeChain";
 
-console.log(sum(1)(2)(3)(4));
+// console.log(sum(1)(2)(3)(4));
+
+import bookStore from "./abstract-factory/book-store";
+
+console.log(bookStore());