Add S3EventSource Not Possible with Existing Bucket

I have an existing bucket that I would like to trigger a lambda whenever a zip file is uploaded so that the lambda can unzip it and process the unzipped files.

However, I cannot add S3EventSource to an existing S3 bucket. For example, this fails to compile:

    const filesBucket = s3.Bucket.fromBucketName(this, 'SBFilesBucket', props.s3Bucket);

    fileUnzipAdaptor.addEventSource(new S3EventSource(filesBucket, {
      events: [s3.EventType.OBJECT_CREATED],
      filters: [{suffix: 'zip'}] // optional
    }));

The error is:

error TS2345: Argument of type 'IBucket' is not assignable to parameter of type 'Bucket'.
  Type 'IBucket' is missing the following properties from type 'Bucket': autoCreatePolicy, lifecycleRules, notifications, metrics, and 25 more.

Is this by design? If so, how else can I obtain the desired effect?

Reproduction Steps

    const filesBucket = s3.Bucket.fromBucketName(this, 'SBFilesBucket', props.s3Bucket);

    fileUnzipAdaptor.addEventSource(new S3EventSource(filesBucket, {
      events: [s3.EventType.OBJECT_CREATED],
      filters: [{suffix: 'zip'}] // optional
    }));

Where props.s3Bucket is the name of a existing S3 bucket.

Error Log

error TS2345: Argument of type 'IBucket' is not assignable to parameter of type 'Bucket'.
  Type 'IBucket' is missing the following properties from type 'Bucket': autoCreatePolicy, lifecycleRules, notifications, metrics, and 25 more.

Environment

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This is 🐛 Bug Report

[xiangweilee]

this feature should be supported from the beginning

[aruneko]

I have same problem now. An stack overflow user solves this problem with AwsCustomResource. But I think it is not smart. I would be happy to solve this problem by updating CDK.