#30 use loaded js notebook content for js save

also added simple hello-world.js to notebook samples for source code view and testing (#28)

notebooks/intro/hello-world.js

@@ -0,0 +1,31 @@
+// URL: https://observablehq.com/@tmcw/hello-world
+// Title: Hello ${name}
+// Author: Tom MacWright (@tmcw)
+// Version: 7
+// Runtime version: 1
+
+const m0 = {
+  id: "6759b582dec65059@7",
+  variables: [
+    {
+      name: "hello",
+      inputs: ["md","name"],
+      value: (function(md,name){return(
+md`# Hello ${name}`
+)})
+    },
+    {
+      name: "name",
+      value: (function(){return(
+'world'
+)})
+    }
+  ]
+};
+
+const notebook = {
+  id: "6759b582dec65059@7",
+  modules: [m0]
+};
+
+export default notebook;

src/views/notebook.view.ts

@@ -402,13 +402,7 @@ export class NotebookView {
       // save notebook file
       switch (fileType) {
         case '.js':
-          const notebookDocumentUrl: string = 
-            `${config.observableApiUrl}/${this._notebook.authorName}/${this._notebook.fileName}.js`;
-          fetch(notebookDocumentUrl)
-            .then((response: any) => response.text())
-            .then((notebookJS: string) => {
-              this.saveFile(notebookFileUri, notebookJS);
-            });
+          this.saveFile(notebookFileUri, this._content);
           break;
         case '.html':
           // TODO