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import type { ProviderStreamOptions, ReasoningEffort } from "@dispatch/kernel";
/**
* Map a resolved `ReasoningEffort` to Umans' `reasoning_effort` wire value.
*
* Umans' OpenAI route accepts `"none"|"low"|"medium"|"high"`; Dispatch's
* `ReasoningEffort` adds `"xhigh"|"max"`, which Umans caps to `"high"`. An
* absent effort (`undefined`) maps to `undefined` so the caller emits no
* `reasoning_effort` field at all — byte-stable when the caller has no
* preference.
*
* Pure: the `transformBody` decision, factored out for direct unit testing.
*/
export function mapReasoningEffort(
effort: ReasoningEffort | undefined,
): "low" | "medium" | "high" | undefined {
if (effort === undefined) return undefined;
if (effort === "xhigh" || effort === "max") return "high";
return effort;
}
/**
* Provider-specific body transform handed to `@dispatch/openai-stream`'s
* `createOpenAICompatProvider`. Returns the extra fields the library merges
* into the chat-completions body before send. Adds `reasoning_effort` only when
* a resolved effort is present; returns `{}` (no fields) otherwise —
* byte-stable for calls with no reasoning preference.
*/
export function transformBody(
_body: Record<string, unknown>,
opts: ProviderStreamOptions,
): Record<string, unknown> {
const mapped = mapReasoningEffort(opts.reasoningEffort);
if (mapped === undefined) return {};
return { reasoning_effort: mapped };
}
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