Migrate utils.js to TypeScript

Signed-off-by: David Mehren <dmehren1@gmail.com>

lib/utils.js

@@ -1,27 +0,0 @@
-'use strict'
-
-exports.isSQLite = function isSQLite (sequelize) {
-  return sequelize.options.dialect === 'sqlite'
-}
-
-exports.getImageMimeType = function getImageMimeType (imagePath) {
-  var fileExtension = /[^.]+$/.exec(imagePath)
-
-  switch (fileExtension[0]) {
-    case 'bmp':
-      return 'image/bmp'
-    case 'gif':
-      return 'image/gif'
-    case 'jpg':
-    case 'jpeg':
-      return 'image/jpeg'
-    case 'png':
-      return 'image/png'
-    case 'tiff':
-      return 'image/tiff'
-    case 'svg':
-      return 'image/svg+xml'
-    default:
-      return undefined
-  }
-}

lib/utils.ts

@@ -0,0 +1,30 @@
+export module Utils {
+  export function isSQLite(sequelize) {
+    return sequelize.options.dialect === 'sqlite'
+  }
+
+  export function getImageMimeType(imagePath: string) {
+    const fileExtension = /[^.]+$/.exec(imagePath)
+    switch (fileExtension?.[0]) {
+      case 'bmp':
+        return 'image/bmp'
+      case 'gif':
+        return 'image/gif'
+      case 'jpg':
+      case 'jpeg':
+        return 'image/jpeg'
+      case 'png':
+        return 'image/png'
+      case 'tiff':
+        return 'image/tiff'
+      case 'svg':
+        return 'image/svg+xml'
+      default:
+        return undefined
+    }
+  }
+
+}
+
+
+