change demos to typescript and WidthType disparity

demo/index.ts

@@ -0,0 +1,34 @@
+// tslint:disable:no-console
+import * as fs from "fs";
+import * as prompt from "prompt";
+import * as shelljs from "shelljs";
+
+console.log("What demo do you wish to run? (Enter a number)");
+
+const schema = {
+    properties: {
+        number: {
+            pattern: /^[0-9]+$/,
+            message: "Please enter a number.",
+            required: true,
+        },
+    },
+};
+
+prompt.start();
+
+prompt.get(schema, (_, result) => {
+    const demoNumber = result.number;
+    const filePath = `./demo/demo${demoNumber}.ts`;
+
+    if (!fs.existsSync(filePath)) {
+        console.error(`demo${demoNumber} does not exist: ${filePath}`);
+        return;
+    }
+    console.log(`Running demo ${demoNumber}`);
+    if (shelljs.exec(`npm run ts-node -- ${filePath}`).code === 0) {
+        console.log("Document created successfully");
+    } else {
+        console.error("Something went wrong with the demo");
+    }
+});