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array,
boolean,
literal,
nullable,
number,
object,
optional,
size,
string,
union,
unknown,
} from '@metamask/superstruct';
export type {
AssistantStreamDelta,
ChatChoice,
ChatMessage,
ChatParams,
ChatResult,
ChatStreamChunk,
ChatStreamDelta,
ChatStreamToolCallDelta,
Tool,
ToolCall,
Usage,
} from '../types.ts';
const ToolCallStruct = object({
id: string(),
type: literal('function'),
index: optional(number()),
function: object({ name: string(), arguments: string() }),
});
const SystemMessageStruct = object({
role: literal('system'),
content: string(),
});
const UserMessageStruct = object({
role: literal('user'),
content: string(),
});
const AssistantMessageStruct = object({
role: literal('assistant'),
content: nullable(string()),
tool_calls: optional(array(ToolCallStruct)),
});
const ToolMessageStruct = object({
role: literal('tool'),
content: string(),
tool_call_id: string(),
});
const ChatMessageStruct = union([
SystemMessageStruct,
UserMessageStruct,
AssistantMessageStruct,
ToolMessageStruct,
]);
const ToolStruct = object({
type: literal('function'),
function: object({
name: string(),
description: optional(string()),
parameters: optional(unknown()),
}),
});
const StopStruct = optional(union([string(), array(string())]));
/**
* Superstruct schema for chat completion request parameters.
*/
export const ChatParamsStruct = object({
model: size(string(), 1, Infinity),
messages: array(ChatMessageStruct),
tools: optional(array(ToolStruct)),
max_tokens: optional(number()),
temperature: optional(number()),
top_p: optional(number()),
stop: StopStruct,
seed: optional(number()),
n: optional(number()),
stream: optional(boolean()),
});
const UsageStruct = object({
prompt_tokens: number(),
completion_tokens: number(),
total_tokens: number(),
});
const ChatChoiceStruct = object({
message: ChatMessageStruct,
index: number(),
finish_reason: nullable(string()),
});
/**
* Superstruct schema for a non-streaming `/v1/chat/completions` response body.
*/
export const ChatResultStruct = object({
id: string(),
model: string(),
choices: array(ChatChoiceStruct),
usage: UsageStruct,
});
const ChatStreamToolCallDeltaStruct = object({
index: optional(number()),
id: optional(string()),
type: optional(literal('function')),
function: optional(
object({
name: optional(string()),
arguments: optional(string()),
}),
),
});
/** Wire `delta` before streaming normalization adds `role: 'assistant'`. */
const ChatStreamDeltaWireStruct = object({
role: optional(literal('assistant')),
content: optional(string()),
tool_calls: optional(array(ChatStreamToolCallDeltaStruct)),
});
/**
* Superstruct schema for one SSE `data:` JSON object from `/v1/chat/completions` when `stream: true`.
*/
export const ChatStreamChunkStruct = object({
id: string(),
model: string(),
choices: array(
object({
delta: ChatStreamDeltaWireStruct,
index: number(),
finish_reason: nullable(string()),
}),
),
});
/**
* Superstruct schema for a `/v1/models` response body (only fields we read).
*/
export const ListModelsResponseStruct = object({
data: array(object({ id: string() })),
});
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