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🧹 [code health improvement] Remove unused AnthropicStreamEvent type #22

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🧹 [code health improvement] Remove unused AnthropicStreamEvent type #22

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4b08085
Remove unused AnthropicStreamEvent type
shantoislamdev Jun 1, 2026
a0cb7eb
Utilize AnthropicStreamEvent to improve internal type safety
shantoislamdev Jun 1, 2026
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39 changes: 22 additions & 17 deletions src/converters/streaming.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ import { FastifyReply } from 'fastify';
import { Stream } from 'openai/streaming';
import {
AnthropicMessageResponse,
AnthropicStreamEvent,
AnthropicUsage,
} from '../types/anthropic';
import { OpenAIStreamChunk, OpenAIStreamToolCall } from '../types/openai';
Expand Down Expand Up @@ -216,7 +217,7 @@ function processToolCallDelta(
}

function sendMessageStart(state: StreamingState, raw: any): void {
const event = {
const event: AnthropicStreamEvent = {
type: 'message_start',
message: {
id: state.messageId,
Expand All @@ -229,10 +230,12 @@ function sendMessageStart(state: StreamingState, raw: any): void {
usage: {
input_tokens: state.inputTokens,
output_tokens: state.outputTokens,
cache_read_input_tokens: state.cachedInputTokens,
},
} as AnthropicUsage,
},
};
if (state.cachedInputTokens > 0) {
event.message.usage.cache_read_input_tokens = state.cachedInputTokens;
}
sendSSE(event, raw);
}

Expand All @@ -256,7 +259,7 @@ function sendContentBlockStart(
};
}

const event = {
const event: AnthropicStreamEvent = {
type: 'content_block_start',
index,
content_block: contentBlock,
Expand All @@ -265,7 +268,7 @@ function sendContentBlockStart(
}

function sendTextDelta(index: number, text: string, raw: any): void {
const event = {
const event: AnthropicStreamEvent = {
type: 'content_block_delta',
index,
delta: {
Expand All @@ -277,7 +280,7 @@ function sendTextDelta(index: number, text: string, raw: any): void {
}

function sendInputJsonDelta(index: number, partialJson: string, raw: any): void {
const event = {
const event: AnthropicStreamEvent = {
type: 'content_block_delta',
index,
delta: {
Expand All @@ -289,7 +292,7 @@ function sendInputJsonDelta(index: number, partialJson: string, raw: any): void
}

function sendContentBlockStop(index: number, raw: any): void {
const event = {
const event: AnthropicStreamEvent = {
type: 'content_block_stop',
index,
};
Expand All @@ -313,21 +316,23 @@ function finishStream(state: StreamingState, raw: any): void {
});

// Send message_delta
const deltaEvent = {
const usage: any = {
output_tokens: state.outputTokens,
};
if (state.cachedInputTokens > 0) {
usage.cache_read_input_tokens = state.cachedInputTokens;
}
const deltaEvent: AnthropicStreamEvent = {
type: 'message_delta',
delta: {
stop_reason: stopReason,
stop_sequence: null,
},
usage: {
output_tokens: state.outputTokens,
cache_read_input_tokens: state.cachedInputTokens,
stop_reason: stopReason as 'end_turn' | 'max_tokens' | 'stop_sequence' | 'tool_use',
},
usage,
};
sendSSE(deltaEvent, raw);

// Send message_stop
sendSSE({ type: 'message_stop' }, raw);
sendSSE({ type: 'message_stop' } as AnthropicStreamEvent, raw);

raw.end();
}
Expand All @@ -341,7 +346,7 @@ function sendErrorEvent(error: Error, state: StreamingState, raw: any): void {
streaming: true
});

const event = {
const event: AnthropicStreamEvent = {
type: 'error',
error: {
type: 'api_error',
Expand All @@ -352,7 +357,7 @@ function sendErrorEvent(error: Error, state: StreamingState, raw: any): void {
raw.end();
}

function sendSSE(data: any, raw: any): void {
function sendSSE(data: AnthropicStreamEvent, raw: any): void {
raw.write(`event: ${data.type}\n`);
raw.write(`data: ${JSON.stringify(data)}\n\n`);
}
43 changes: 24 additions & 19 deletions src/converters/xmlStreaming.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@

import { FastifyReply } from 'fastify';
import { Stream } from 'openai/streaming';
import { AnthropicStreamEvent, AnthropicUsage } from '../types/anthropic';
import { OpenAIStreamChunk } from '../types/openai';
import { generateToolUseId } from './tools';
import { recordUsage } from '../utils/tokenUsage';
Expand Down Expand Up @@ -175,23 +176,23 @@ function cleanToolArgs(args: string): string {

function emitTextBlock(text: string, state: BufferedState, raw: any): void {
// Start text block
const startEvent = {
const startEvent: AnthropicStreamEvent = {
type: 'content_block_start',
index: state.contentBlockIndex,
content_block: { type: 'text', text: '' },
};
sendSSE(startEvent, raw);

// Send text delta
const deltaEvent = {
const deltaEvent: AnthropicStreamEvent = {
type: 'content_block_delta',
index: state.contentBlockIndex,
delta: { type: 'text_delta', text },
};
sendSSE(deltaEvent, raw);

// Stop text block
const stopEvent = {
const stopEvent: AnthropicStreamEvent = {
type: 'content_block_stop',
index: state.contentBlockIndex,
};
Expand All @@ -204,7 +205,7 @@ function emitToolUseBlock(toolName: string, args: string, state: BufferedState,
const toolId = generateToolUseId();

// Start tool_use block
const startEvent = {
const startEvent: AnthropicStreamEvent = {
type: 'content_block_start',
index: state.contentBlockIndex,
content_block: {
Expand All @@ -217,7 +218,7 @@ function emitToolUseBlock(toolName: string, args: string, state: BufferedState,
sendSSE(startEvent, raw);

// Send complete input as single delta
const deltaEvent = {
const deltaEvent: AnthropicStreamEvent = {
type: 'content_block_delta',
index: state.contentBlockIndex,
delta: {
Expand All @@ -228,7 +229,7 @@ function emitToolUseBlock(toolName: string, args: string, state: BufferedState,
sendSSE(deltaEvent, raw);

// Stop tool_use block
const stopEvent = {
const stopEvent: AnthropicStreamEvent = {
type: 'content_block_stop',
index: state.contentBlockIndex,
};
Expand All @@ -239,7 +240,7 @@ function emitToolUseBlock(toolName: string, args: string, state: BufferedState,
}

function sendMessageStart(state: BufferedState, raw: any): void {
const event = {
const event: AnthropicStreamEvent = {
type: 'message_start',
message: {
id: state.messageId,
Expand All @@ -252,10 +253,12 @@ function sendMessageStart(state: BufferedState, raw: any): void {
usage: {
input_tokens: state.inputTokens,
output_tokens: state.outputTokens,
cache_read_input_tokens: state.cachedInputTokens,
},
} as AnthropicUsage,
},
};
if (state.cachedInputTokens > 0) {
event.message.usage.cache_read_input_tokens = state.cachedInputTokens;
}
sendSSE(event, raw);
}

Expand All @@ -275,21 +278,23 @@ function finishStream(state: BufferedState, raw: any): void {
});

// Send message_delta
const deltaEvent = {
const usage: any = {
output_tokens: state.outputTokens,
};
if (state.cachedInputTokens > 0) {
usage.cache_read_input_tokens = state.cachedInputTokens;
}
const deltaEvent: AnthropicStreamEvent = {
type: 'message_delta',
delta: {
stop_reason: stopReason,
stop_sequence: null,
},
usage: {
output_tokens: state.outputTokens,
cache_read_input_tokens: state.cachedInputTokens,
stop_reason: stopReason as 'end_turn' | 'max_tokens' | 'stop_sequence' | 'tool_use',
},
usage,
};
sendSSE(deltaEvent, raw);

// Send message_stop
sendSSE({ type: 'message_stop' }, raw);
sendSSE({ type: 'message_stop' } as AnthropicStreamEvent, raw);

raw.end();
}
Expand All @@ -303,7 +308,7 @@ function sendErrorEvent(error: Error, state: BufferedState, raw: any): void {
streaming: true
});

const event = {
const event: AnthropicStreamEvent = {
type: 'error',
error: {
type: 'api_error',
Expand All @@ -314,7 +319,7 @@ function sendErrorEvent(error: Error, state: BufferedState, raw: any): void {
raw.end();
}

function sendSSE(data: any, raw: any): void {
function sendSSE(data: AnthropicStreamEvent, raw: any): void {
raw.write(`event: ${data.type}\n`);
raw.write(`data: ${JSON.stringify(data)}\n\n`);
}