import type { ParseResult, ParseOptions, ParseContext, SchemaNode, AnyValiDocument, ExportMode, CoercionConfig, MetadataOptions, DescribeOptions } from "../types.js";
/**
 * Maximum validation recursion depth. Bounds recursion through recursive
 * `$ref` schemas (and deeply nested data) so a malicious payload cannot
 * exhaust the call stack and crash the process (DoS). Far above any
 * legitimate schema nesting.
 */
export declare const MAX_DEPTH = 512;
/** Sentinel for "value not present" */
export declare const ABSENT: unique symbol;
export type Absent = typeof ABSENT;
export declare abstract class BaseSchema<TInput = unknown, TOutput = TInput> {
    /** Type-level brand for Infer<T>. Never assigned at runtime. */
    readonly _output: TOutput;
    /** @internal */ _defaultValue: TOutput | Absent;
    /** @internal */ _coercionConfig: CoercionConfig | undefined;
    /** @internal */ _isPortable: boolean;
    /** @internal */ _metadata: Record<string, unknown> | undefined;
    /** @internal */ _importedDefinitions: Record<string, SchemaNode>;
    /** @internal */ _importedExtensions: AnyValiDocument["extensions"];
    parse(input: unknown, options?: ParseOptions): TOutput;
    safeParse(input: unknown, options?: ParseOptions): ParseResult<TOutput>;
    /** @internal */
    _safeParseWithContext(input: unknown, ctx: ParseContext): ParseResult<TOutput>;
    /** Internal: run the 5-step pipeline */
    _runPipeline(input: unknown, ctx: ParseContext): unknown;
    private _runPipelineInner;
    /** Override in subclasses to provide the coercion target type name */
    _getCoercionTarget(): string;
    abstract _validate(input: unknown, ctx: ParseContext): unknown;
    abstract _toNode(): SchemaNode;
    /** @internal Direct schema children; refs retain their document context separately. */
    _children(): BaseSchema[];
    default(value: TOutput): this;
    coerce(options?: CoercionConfig): this;
    describe(description: string, opts?: DescribeOptions): this;
    metadata(meta: Record<string, unknown>, opts?: MetadataOptions): this;
    export(mode?: ExportMode): AnyValiDocument;
    private _validateDescribeOpts;
    protected _clone(): this;
    protected _addDefault(node: SchemaNode): SchemaNode;
}
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