[adamsilverstein]

Follow up to the hard coding review comment on WordPress#15512 - targets that PR's branch so it can be merged in there.

Claude made the change, notes below:

The image formats the pipeline takes were listed twice in core: the new isPipelineFile() check in media-upload-pipeline.js, and the placeholder tile typing in media-frame-upload.js. Both now read one IMAGE_SUBTYPES list in media-upload-pipeline.js. The media frame gets it through a new wp.mediaUploadPipeline.getImageSubtype( fileName ), which also does the jpg to jpeg mapping.

The list carries a comment pointing at CLIENT_SIDE_SUPPORTED_MIME_TYPES and HEIC_MIME_TYPES in @wordpress/upload-media, the list it mirrors. Removing that last copy needs upload-media to export the list or an "is this processable" helper, which is a Gutenberg change and left for a follow up.

One small behavior change: the placeholder typing now matches the file extension after the last dot, where the old regex matched the end of the name, so a file named notajpg no longer gets an image placeholder. Routing is unchanged.

Testing

• media-library, media-new and media-modal client-side upload e2e specs pass locally (41 tests).
• jshint and npm run typecheck:js are clean.

Manually: in a media frame, upload a JPEG (.jpg) and a PNG and check the placeholder tiles show as images while uploading, then upload a PDF and check it still goes to async-upload.php.

AI Use

Code and description written with 🤖 Claude Code at my request. I will review and test.

🤖 Generated with Claude Code

https://claude.ai/code/session_018vwYjTNtbdhcmnECA2bZxP

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