import { PromiseList } from "../core/mod.ts";
/**
 * @ignore
 *
 * The context for processing a value for a {@link Structure}
 */
export type StructContext = {
    type: "sync";
    path: string[];
} | {
    type: "async";
    path: string[];
    promises: PromiseList;
};
/**
 * @ignore
 *
 * Create a new {@link StructContext} as a child of an existing context, under a key.
 * For example when nesting a field while already processing an object
 */
export declare function _nestContext(input: StructContext, key: string): StructContext;
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