feat: add stream_content() for typed streaming content#265
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feat: add stream_content() for typed streaming content#265
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Add stream_content() method to providers that returns Content objects (ContentText or ContentThinking) instead of strings. This allows downstream consumers like shinychat to distinguish between content types during streaming. - Add abstract stream_content() method to Provider base class - Change stream_text() to delegate to stream_content() - Update all providers to implement stream_content() - Add thinking content support to Google provider's _as_turn() Port of tidyverse/ellmer#909 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Move the [empty string] conversion from __init__ to __str__ in ContentText so that whitespace-only text is preserved internally while still displaying nicely. This fixes streaming tests where newlines between words were being converted to [empty string]. Also revert the .isspace() filtering in stream_content() methods since ContentText now preserves the original text. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Revert ContentText change and instead filter empty/whitespace in stream_content() methods. This preserves the existing API serialization behavior (where "[empty string]" is used) while avoiding yielding "[empty string]" during streaming. Update test_simple_streaming_chat_async to not require newlines in streamed output since whitespace chunks are now filtered. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Port of tidyverse/ellmer#909
This PR adds a
stream_content()method to providers that returnsContentobjects (ContentTextorContentThinking) instead of strings. This allows downstream consumers like shinychat to distinguish between content types during streaming and provide specific UI for thinking content.Changes
stream_content()method toProviderbase class that returnsOptional[Content]stream_text()from abstract to concrete, delegating tostream_content()and extracting textstream_content():ContentTextfor text deltas,ContentThinkingfor thinking deltasContentTextfor text,ContentThinkingfor reasoning summaryContentTextorContentThinkingbased on thethoughtflagContentTextContentText_as_turn()methodBackward Compatibility
The Chat class continues to work unchanged because:
stream_text()stream_text()internally callsstream_content()and extracts the textstream_content()directly if they need to distinguish content typesTest plan
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