import { z } from "zod";
/**
 * Validates input against a Zod schema and throws CanonError on failure.
 */
export declare function validateOrThrow<T>(schema: z.ZodSchema<T>, input: unknown): T;
/**
 * Creates a contract schema by extending SchemaHeader with additional fields.
 */
export declare function createContractSchema<T extends z.ZodRawShape>(schemaId: string, schemaVersion: string, fields: T): z.ZodObject<{
    _schema_id: z.ZodString;
    _schema_version: z.ZodString;
    _context: z.ZodObject<{
        created_by: z.ZodString;
        created_at: z.ZodString;
        updated_by: z.ZodOptional<z.ZodString>;
        updated_at: z.ZodOptional<z.ZodString>;
        reason: z.ZodOptional<z.ZodString>;
        source: z.ZodOptional<z.ZodString>;
    }>;
    type: z.ZodString;
} & T>;
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