make a separate file to store all information about fields and their migrations

src/modules/config_declaration.js

@@ -0,0 +1,42 @@
+export const CONFIG_MIGRATION = 1
+import { v4 as uuidv4 } from 'uuid';
+
+// for future use
+/*
+const simpleDeclaration = {
+  store: 'server-side',
+  migrationFlag: 'configMigration',
+  migration(serverside, rootState) {
+    serverside.setPreference({ path: 'simple.' + field, value: rootState.config[oldField ?? field] })
+  }
+}
+*/
+
+export const declarations = [
+  {
+    field: 'muteFilters',
+    store: 'server-side',
+    migrationFlag: 'configMigration',
+    migrationNum: 1,
+    description: 'Mute filters, wordfilter/regexp/etc',
+    valueType: 'complex',
+    migration (serverside, rootState) {
+      rootState.config.muteWords.forEach((word, order) => {
+        const uniqueId = uuidv4()
+
+        serverside.setPreference({
+          path: 'simple.muteFilters.' + uniqueId,
+          value: {
+            type: 'word',
+            value: word,
+            name: word,
+            enabled: true,
+            expires: null,
+            hide: false,
+            order
+          }
+        })
+      })
+    }
+  }
+]