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Perplexity Sonar streaming bug — Ascend Corp | EGG Digital #1523

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Perplexity Sonar streaming bug — Ascend Corp | EGG Digital #1523

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27 changes: 25 additions & 2 deletions src/providers/perplexity-ai/chatComplete.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -207,7 +207,30 @@ export const PerplexityAIChatCompleteStreamChunkTransform: (
chunk = chunk.replace(/^data: /, '');
chunk = chunk.trim();

if (chunk === '[DONE]') {
return `data: [DONE]\n\n`;
}

const parsedChunk: PerplexityAIChatCompletionStreamChunk = JSON.parse(chunk);

// Handle chunks with empty or missing choices (e.g., intermediate events
// from Sonar Deep Research models during searching/thinking phases)
if (!parsedChunk.choices || parsedChunk.choices.length === 0) {
return (
`data: ${JSON.stringify({
id: parsedChunk.id ?? fallbackId,
object: parsedChunk.object,
created: Math.floor(Date.now() / 1000),
model: parsedChunk.model,
provider: PERPLEXITY_AI,
...(!strictOpenAiCompliance && {
citations: parsedChunk.citations,
}),
choices: [],
})}` + '\n\n'
);
}

let returnChunk =
`data: ${JSON.stringify({
id: parsedChunk.id,
Expand All @@ -221,8 +244,8 @@ export const PerplexityAIChatCompleteStreamChunkTransform: (
choices: [
{
delta: {
role: parsedChunk.choices[0]?.delta.role,
content: parsedChunk.choices[0]?.delta.content,
role: parsedChunk.choices[0]?.delta?.role,
content: parsedChunk.choices[0]?.delta?.content,
},
index: 0,
finish_reason: parsedChunk.choices[0]?.finish_reason,
Expand Down