Set erase_chip as default option when not set before

src/js/ConfigStorage.js

@@ -3,7 +3,7 @@
  * @param {string | string[]} key string or array of strings
  * @returns {object}
  */
-export function get(key) {
+export function get(key, defaultValue = null) {
   let result = {};
   if (Array.isArray(key)) {
     key.forEach(function (element) {
@@ -24,6 +24,11 @@ export function get(key) {
     }
   }
 
+  // if default value is set and key is not found in localStorage, set default value
+  if (!result[key] && defaultValue !== null) {
+    result[key] = defaultValue;
+  }
+
   return result;
 }
 

src/js/main.js

@@ -63,14 +63,15 @@ function readConfiguratorVersionMetadata() {
 }
 
 function cleanupLocalStorage() {
-
+    // storage quota is 5MB, we need to clean up some stuff (more info see PR #2937)
     const cleanupLocalStorageList = [
         'cache',
         'firmware',
         'https',
         'selected_board',
         'unifiedConfigLast',
         'unifiedSourceCache',
+        'erase_chip',
     ];
 
     for (const key in localStorage) {

src/js/tabs/firmware_flasher.js

@@ -574,12 +574,8 @@ firmware_flasher.initialize = function (callback) {
             self.isFlashing = false;
         }
 
-        let result = getConfig('erase_chip');
-        if (result.erase_chip) {
-            $('input.erase_chip').prop('checked', true);
-        } else {
-            $('input.erase_chip').prop('checked', false);
-        }
+        let result = getConfig('erase_chip', true);
+        $('input.erase_chip').prop('checked', result.erase_chip);
 
         $('input.erase_chip').change(function () {
             setConfig({'erase_chip': $(this).is(':checked')});