import { type ScenePlanDiagnostic } from "../diagnostics/diagnostics.js";
import { type SceneFragmentBudget, type SceneFragmentContext } from "./types.js";
import type { JsonValue } from "../model/json.js";
export type FragmentPath = readonly (string | number)[];
export declare function fragmentDiagnostic(code: string, path: FragmentPath, message: string, details?: JsonValue): ScenePlanDiagnostic;
export declare function isRecord(value: unknown): value is Record<string, unknown>;
export declare function fragmentBudget(context: SceneFragmentContext): SceneFragmentBudget;
export declare class FragmentInputError extends Error {
    readonly code: string;
    readonly path: FragmentPath;
    constructor(code: string, path: FragmentPath, message: string);
}
/** Fragment-specific diagnostics over the shared bounded scene JSON reader. */
export declare function readFragmentJson(input: unknown, maxBytes: number, maxDepth: number): unknown;
export declare function inputFailure(error: unknown): {
    ok: false;
    diagnostics: readonly ScenePlanDiagnostic[];
};
export declare function rejectUnknownFields(value: object, allowed: readonly string[], path: FragmentPath, diagnostics: ScenePlanDiagnostic[]): void;
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