added storage helpers

src/helpers.ts

@@ -1,4 +1,31 @@
 function canonicalize(item: string)
 {
     return item.toLowerCase().replace(/ /g, '_');
+}
+
+function pretty(item: string)
+{
+    return item.substring(0, 1).toUpperCase() + item.substring(1);
+}
+
+async function getStorageValue(key: string): Promise<any>
+{
+    return new Promise((resolve, reject) =>
+    {
+        chrome.storage.local.get(key, (result) =>
+        {
+            resolve(result[key]);
+        });
+    });
+}
+
+async function setStorageValue(key: string, value: any): Promise<void>
+{
+    return new Promise((resolve, reject) =>
+    {
+        chrome.storage.local.set({[key]: value}, () =>
+        {
+            resolve();
+        });
+    });
 }