How to use the @aws-cdk/aws-codebuild.FilterGroup function in @aws-cdk/aws-codebuild

buildRole.addToPolicy(new iam.PolicyStatement({
            resources: [`${this.ecrRepository.repositoryArn}*`],
            actions: ['ecr:*']
        }));

        // ECR LifeCycles
        // repository.addLifecycleRule({ tagPrefixList: ['prod'], maxImageCount: 9999 });
        this.ecrRepository.addLifecycleRule({maxImageAge: cdk.Duration.days(30)});

        const defaultSource = codebuild.Source.gitHub({
            owner: 'humank',
            repo: 'EventStormingWorkShop',
            webhook: true, // optional, default: true if `webhookFilteres` were provided, false otherwise
            webhookFilters: [
                codebuild.FilterGroup.inEventOf(codebuild.EventAction.PUSH).andBranchIs('master'),
            ], // optional, by default all pushes and Pull Requests will trigger a build
        });

        let bucketName = 'coffeeshop-' + Math.random().toString(36).substring(7);
        const coffeeShopBucket = new s3.Bucket(this, 'CoffeeShopBucket', {
            bucketName: bucketName,
            // The default removal policy is RETAIN, which means that cdk destroy will not attempt to delete
            // the new bucket, and it will remain in your account until manually deleted. By setting the policy to
            // DESTROY, cdk destroy will attempt to delete the bucket, but will error if the bucket is not empty.

            //removalPolicy: cdk.RemovalPolicy.DESTROY, // NOT recommended for production code
        });

        coffeeShopBucket.grantPut(buildRole);
        coffeeShopBucket.grantRead(buildRole);
        coffeeShopBucket.grantReadWrite(buildRole);