import type { Struct } from "@metamask/superstruct";
import type { Hex } from "@metamask/utils";
/**
 * Validates address format, checks user eth_accounts permissions.
 *
 * @param address - The Ethereum address to validate and normalize.
 * @param origin - The origin string for permission checking.
 * @param getPermittedAccountsForOrigin - Function to retrieve permitted accounts for the origin.
 * @returns A normalized (lowercase) hex address if valid and authorized.
 * @throws JsonRpcError with unauthorized error if the requester doesn't have permission to access the address.
 * @throws JsonRpcError with invalid params if the address format is invalid.
 */
export declare function validateAndNormalizeAddress(address: Hex, origin: string, getPermittedAccountsForOrigin: (origin: string) => Promise<string[]>): Promise<Hex>;
/**
 * Validates parameters against a Superstruct schema and throws an error if validation fails.
 *
 * @param value - The value to validate against the struct schema.
 * @param struct - The Superstruct schema to validate against.
 * @throws JsonRpcError with invalid params if the value doesn't match the struct schema.
 */
export declare function validateParams<ParamsType>(value: unknown | ParamsType, struct: Struct<ParamsType>): asserts value is ParamsType;
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