replacestream | basic streaming text search and replace and is chunk | Runtime Evironment library

The page in your PDF contains only a single image XObject resource which is used in a single form XObject resource which is used three times in the page content stream.

Thus, after you replaced the only image resource, all of its (indirect) usages on the page show the replacement image.

If you wanted to change this using iText, you'd have to edit the content stream and replace the instruction for the form XObject use by the use of the new image. But you'd first have to identify which of those XObject usages there is the one you want to replace.

Non-trivial, in particular if the Birt template is meant to be somewhat flexible.

I would recommend you instead use different images (using different marker colors) for the different locations in your report template. This of course becomes more and more difficult the more such placeholder images there are, in particular if the number is dynamic and can become arbitrarily large, e.g. one per dataset entry in a dataset with an unknown but potentially large number of entries.

Just write it to a writable stream.

I think it is because you are using the Class instance fields syntax that is in stage-2, but you are using the Babel stage-3 preset (good idea to post your package.json!)

Check it out here. If you enable stage-2, you will see that the error goes away.