// filter only items with someValue:true
    fn.addEventSource(new lambda_events.DynamoEventSource(tbl, {
      startingPosition: lambda.StartingPosition.LATEST,
      filters: [
        lambda.FilterCriteria.filter({
          eventName: lambda.FilterRule.isEqual('INSERT'),
          dynamodb: {
            NewImage: {
              'someValue': { BOOL: lambda.FilterRule.isEqual(true) } // this is not possible
            }
          }
        })
      ]
    }));

    const tbl = new ddb.Table(this, 'T', {
      partitionKey: {
        name: 'id',
        type: ddb.AttributeType.STRING
      },
      removalPolicy: cdk.RemovalPolicy.DESTROY,
      stream: ddb.StreamViewType.NEW_IMAGE
    });

    const fn = new lambda.Function(this, 'F', {
      runtime: lambda.Runtime.NODEJS_16_X,
      handler: 'index.handler',
      code: lambda.Code.fromInline(`exports.handler = function(event, context) {
        console.log(event);
        console.log(event.Records[0].dynamodb)
        return;
      }`),
    });

    // filter only items with someValue:true
    fn.addEventSource(new lambda_events.DynamoEventSource(tbl, {
      startingPosition: lambda.StartingPosition.LATEST,
      filters: [
        lambda.FilterCriteria.filter({
          eventName: lambda.FilterRule.isEqual('INSERT'),
          dynamodb: {
            NewImage: {
              'someValue': { BOOL: lambda.FilterRule.isEqual(true) }
            }
          }
        })
      ]
    }));