@aws/dynamodb-data-mapper

 class FooDocument {
     constructor() {
         this._dirtyFields = new Set();
         this._foo = '';
     }

     get foo() {
         return this._foo;
     }

     set foo(value) {
         this._foo = value;
         this._dirtyFields.add('foo');
     }

     [DynamoDbDirtyFields]() {
         return this._dirtyFields.values();
     }
 }

 class FooDocument {
     [DynamoDbSchema]() {
         return {
             bar: {type: 'String'},
             baz: {type: 'Number'},
         };
     }
 }

 class FooDocument {
     [DynamoDbTable]() {
         return 'FooTable';
     }

     [DynamoDbSchema]() {
         return {
             bar: {type: 'String'},
             baz: {type: 'Number'},
         };
     }
 }