fix(@angular/cli): allow backticks in templateUrl and styleUrls

Author: DetectiveQuack

Diff for: packages/@ngtools/webpack/src/transformers/replace_resources.spec.ts

@@ -41,6 +41,43 @@ describe('@ngtools/webpack transformers', () => {
       expect(oneLine`${result}`).toEqual(oneLine`${output}`);
     });
 
+    it('should replace resources with backticks', () => {
+      const input = stripIndent`
+        import { Component } from '@angular/core';
+
+        @Component({
+          selector: 'app-root',
+          templateUrl: \`./app.component.html\`,
+          styleUrls: [\`./app.component.css\`, \`./app.component.2.css\`]
+        })
+        export class AppComponent {
+          title = 'app';
+        }
+      `;
+      const output = stripIndent`
+        import * as tslib_1 from "tslib";
+        import { Component } from '@angular/core';
+        let AppComponent = class AppComponent {
+            constructor() {
+                this.title = 'app';
+            }
+        };
+        AppComponent = tslib_1.__decorate([
+            Component({
+                selector: 'app-root',
+                template: require("./app.component.html"),
+                styles: [require("./app.component.css"), require("./app.component.2.css")]
+            })
+        ], AppComponent);
+        export { AppComponent };
+      `;
+
+      const transformer = replaceResources(() => true);
+      const result = transformTypescript(input, [transformer]);
+
+      expect(oneLine`${result}`).toEqual(oneLine`${output}`);
+    });
+
     it('should not replace resources if shouldTransform returns false', () => {
       const input = stripIndent`
         import { Component } from '@angular/core';

Diff for: packages/@ngtools/webpack/src/transformers/replace_resources.ts

@@ -131,7 +131,10 @@ function _getContentOfKeyLiteral(node?: ts.Node): string | null {
 }
 
 function _getResourceRequest(element: ts.Expression, sourceFile: ts.SourceFile) {
-  if (element.kind == ts.SyntaxKind.StringLiteral) {
+  if (
+    element.kind === ts.SyntaxKind.StringLiteral ||
+    element.kind === ts.SyntaxKind.NoSubstitutionTemplateLiteral
+  ) {
     const url = (element as ts.StringLiteral).text;
     // If the URL does not start with ./ or ../, prepends ./ to it.
     return `${/^\.?\.\//.test(url) ? '' : './'}${url}`;