fix syntax error

Author: wellwind

.prettierrc

@@ -0,0 +1,3 @@
+{
+  "singleQuote": true
+}

src/app/header/header.component.ts

@@ -1,15 +1,15 @@
-import { Component, EventEmitter, OnInit, Output } from "@angular/core";
-import { ArticlesService } from "../articles.service";
+import { Component, EventEmitter, OnInit, Output } from '@angular/core';
+import { ArticlesService } from '../articles.service';
 
 @Component({
-  selector: "app-header",
-  templateUrl: "./header.component.html",
-  styleUrls: ["./header.component.css"]
+  selector: 'app-header',
+  templateUrl: './header.component.html',
+  styleUrls: ['./header.component.css']
 })
 export class HeaderComponent implements OnInit {
   @Output() keywordChange = new EventEmitter<string>();
 
-  keyword = "";
+  keyword = '';
 
   highlightTitle = false;
   fontSize = 24;

tsconfig.json

@@ -9,12 +9,7 @@
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
     "target": "es5",
-    "typeRoots": [
-      "node_modules/@types"
-    ],
-    "lib": [
-      "es2017",
-      "dom"
-    ]
+    "typeRoots": ["node_modules/@types"],
+    "lib": ["es2017", "dom"]
   }
 }