import { Type } from "@earendil-works/pi-ai";
export declare const nullableString: () => Type.TOptional<Type.TUnion<[Type.TString, Type.TNull]>>;
export declare const positiveInteger: () => Type.TOptional<Type.TInteger>;
export declare const historyRole: Type.TUnion<[Type.TLiteral<"user">, Type.TLiteral<"assistant">, Type.TLiteral<"tool">, Type.TLiteral<"context">]>;
export declare const historyRoles: () => Type.TOptional<Type.TArray<Type.TUnion<[Type.TLiteral<"user">, Type.TLiteral<"assistant">, Type.TLiteral<"tool">, Type.TLiteral<"context">]>>>;
/** Search query parameter: one literal, or several literals combined with OR. */
export declare const searchQuery: () => Type.TUnion<[Type.TString, Type.TArray<Type.TString>]>;
/**
 * Normalize a search `query` parameter into the literal needles to match.
 * A bare string is a one-element list, so single-query behavior is unchanged.
 * An empty list, a non-string element, or an empty string is refused rather than silently
 * searching for nothing: those are argument errors, not empty result sets. An empty string
 * matches every line and every item, so it can never be what the caller meant.
 */
export declare function searchQueries(query: unknown): string[];