fix(transform): match AWS DynamoDB filter and condition expressions

README.md

@@ -4,7 +4,7 @@ This package provides an implementation for the `@aws-appsync/utils` package tha
 
 ## Changelog:
 
-- v0.1.6: add `util.authType()`, derived from the identity of the request; a host installs the request through the new `setResolverContext` export
+- v0.1.6: add `util.authType()`, derived from the identity of the request; a host installs the request through the new `setResolverContext` export. `util.transform.toDynamoDBFilterExpression` and `toDynamoDBConditionExpression` now cover every operator, including `between`, `in`, `size` and `attributeType`, and nested `and`/`or`/`not`; `util.dynamodb.toDynamoDB` accepts `null`
 - v0.1.5: add `rds` `beginsWith`, `between` and `size` conditions, table aliases and `sql` template `where` clauses; invalid input now raises AWS's validation error instead of a raw `TypeError`, and the wildcard conditions require a string
 - v0.1.4: fix `rds` query builders with empty `orderBy`, `where` and `values` inputs, `contains` wildcards and multiple conditions per column; `orderBy` `dir` is now restricted to `ASC`/`DESC`
 - v0.1.3: fix `rds` query builders with star columns, empty `where` objects and nullable `limit`/`offset`

__tests__/__snapshots__/index.test.js.snap

@@ -304,6 +304,12 @@ exports[`dynamodb helpers toDynamoDB boolean 1`] = `
 }
 `;
 
+exports[`dynamodb helpers toDynamoDB null 1`] = `
+{
+  "NULL": null,
+}
+`;
+
 exports[`dynamodb helpers toDynamoDB number 1`] = `
 {
   "N": 12345,