import type { ParseContext, SchemaNode } from "../types.js";
import { BaseSchema } from "./base.js";
export declare class NullableSchema<T extends BaseSchema<any, any> = BaseSchema> extends BaseSchema<unknown, T["_output"] | null> {
    /** @internal */ _inner: T;
    constructor(inner: T);
    _validate(input: unknown, ctx: ParseContext): unknown;
    _runPipeline(input: unknown, ctx: ParseContext): unknown;
    _children(): BaseSchema[];
    _toNode(): SchemaNode;
}
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