add count suffix to newList to update expression

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@parana-games/tinymo",
-  "version": "2.0.5",
+  "version": "2.0.6",
   "description": "simple DynamoDB DocumentClient wrapper",
   "types": "./dist-types/index.d.ts",
   "main": "./dist/index.js",

src/update.ts

@@ -53,8 +53,8 @@ export class Update extends Write {
     const flatArray = [value].flat()
 
     if (createIfNotExists) {
-      this.setBuilder.addValue(`newList`, [])
-      this.setBuilder.pair(listName, flatArray, (n, v) => `${n} = list_append(if_not_exists(${n}, :newList), ${v})`)
+      const valueToken = this.setBuilder.addValue(`newList`, [])
+      this.setBuilder.pair(listName, flatArray, (n, v) => `${n} = list_append(if_not_exists(${n}, ${valueToken}), ${v})`)
     } else {
       this.setBuilder.pair(listName, flatArray, (n, v) => `${n} = list_append(${n}, ${v})`)
     }

test/update.test.ts

@@ -244,4 +244,22 @@ describe('update', () => {
       ConditionExpression: "#a = :aEqualsConditionValue AND #a = :aEqualsConditionValue2 AND #a = :aEqualsConditionValue3"
     })
   })
+
+  it('update with 2 empty lists', () => {
+    const update = new Update('table1850', { PK: 'duplicates' })
+    update.addToList('a', [1, 2, 3])
+    update.addToList('b', [4, 5, 6])
+    expect(update.build()).toStrictEqual({
+        "TableName": "table1850",
+        "Key": { "PK": "duplicates" },
+        "UpdateExpression": "SET #a = list_append(if_not_exists(#a, :newList), :a), #b = list_append(if_not_exists(#b, :newList2), :b)",
+        "ExpressionAttributeNames": { "#a": "a", "#b": "b" },
+        "ExpressionAttributeValues": {
+          ":newList": [],
+          ":a": [ 1, 2, 3 ],
+          ":newList2": [],
+          ":b": [ 4, 5, 6 ]
+        }
+      })
+  })
 })