/**
 * Pure helpers over the JSON-Schema subset: `$ref`/`$defs` resolution and the
 * small predicates the renderer, defaulting, and validation all share. Kept
 * side-effect-free so they can be unit-tested and reused across the module.
 */
import type { JsonSchema, JsonSchemaType } from './types';
/**
 * Resolve an internal `$ref` against the document root, following chained refs
 * (a `$ref` whose target is itself a `$ref`). Only same-document pointers are
 * supported (`#/$defs/Name`, `#/definitions/Name`, `#`); an external or
 * unresolvable ref throws LOUDLY rather than yielding a silent empty schema.
 * A schema with no `$ref` is returned unchanged. A pointer cycle throws.
 */
export declare function resolveRef(schema: JsonSchema, root: JsonSchema): JsonSchema;
/** Does this schema describe the JSON `null` type (and nothing else)? */
export declare function isNullSchema(schema: JsonSchema): boolean;
/** The list of type tokens a schema declares, normalized to an array. */
export declare function typeList(schema: JsonSchema): readonly JsonSchemaType[];
/**
 * The union member list from a schema, if it is a union. Pydantic emits
 * discriminated unions under `oneOf` and plain/null unions under `anyOf`; both
 * are treated as a union here. `allOf` is NOT a union (it is an intersection)
 * and is not returned.
 */
export declare function unionMembers(schema: JsonSchema): readonly JsonSchema[] | undefined;
/** An option row derived from an `enum` or a discriminated variant tag. */
export interface EnumOption {
    readonly value: unknown;
    readonly label: string;
}
/** Render-facing label for an arbitrary JSON scalar used as an enum/const value. */
export declare function scalarLabel(value: unknown): string;
/**
 * The single tag value a discriminated-union variant pins on the discriminator
 * property (Pydantic emits it as `const`, or a single-entry `enum`), or
 * `undefined` if the variant does not constrain that property to one value.
 */
export declare function variantTag(variant: JsonSchema, propertyName: string, root: JsonSchema): unknown;
/** A human label for a union variant: its title, its tag, or a positional fallback. */
export declare function variantLabel(variant: JsonSchema, index: number, discriminatorTag: unknown, root: JsonSchema): string;
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