fix: No longer warn inappropriately when a custom updater is provided as an object

Author: TimothyJones

lib/updaters/index.js

@@ -44,6 +44,7 @@ function getCustomUpdaterFromPath (updater) {
  */
 function isValidUpdater (obj) {
   return (
+    obj &&
     typeof obj.readVersion === 'function' &&
     typeof obj.writeVersion === 'function'
   )
@@ -63,16 +64,19 @@ module.exports.resolveUpdaterObjectFromArgument = function (arg) {
       filename: arg
     }
   }
-  try {
-    if (typeof updater.updater === 'string') {
-      updater.updater = getCustomUpdaterFromPath(updater.updater)
-    } else if (updater.type) {
-      updater.updater = getUpdaterByType(updater.type)
-    } else {
-      updater.updater = getUpdaterByFilename(updater.filename)
+
+  if (!isValidUpdater(updater.updater)) {
+    try {
+      if (typeof updater.updater === 'string') {
+        updater.updater = getCustomUpdaterFromPath(updater.updater)
+      } else if (updater.type) {
+        updater.updater = getUpdaterByType(updater.type)
+      } else {
+        updater.updater = getUpdaterByFilename(updater.filename)
+      }
+    } catch (err) {
+      if (err.code !== 'ENOENT') console.warn(`Unable to obtain updater for: ${JSON.stringify(arg)}\n - Error: ${err.message}\n - Skipping...`)
     }
-  } catch (err) {
-    if (err.code !== 'ENOENT') console.warn(`Unable to obtain updater for: ${JSON.stringify(arg)}\n - Error: ${err.message}\n - Skipping...`)
   }
   /**
    * We weren't able to resolve an updater for the argument.