/**
 * Kept in step with `inferPrimaryType` in @opensea/wallet-adapters
 * (`src/bridges/ethers.ts`). The two are deliberately separate copies: the sdk
 * does not depend on wallet-adapters, and adding that edge would couple the
 * sdk's release to it for one pure function. Change both together.
 */
/**
 * Infer the EIP-712 primary type: the struct that no other struct references,
 * which is the root of the type graph.
 *
 * Taking the first key in `types` instead is wrong whenever a dependency is
 * declared before the root, and it fails silently by signing the wrong struct.
 * ethers resolves this the same way.
 *
 * Refuses rather than guessing when the graph is circular or has more than one
 * root. Both are invalid EIP-712 and ethers rejects them itself ("circular type
 * reference", "ambiguous primary types or unused types"), so throwing costs
 * nothing where the signer validates and prevents a wrong signature where it
 * does not.
 */
export declare function inferPrimaryType(types: Record<string, unknown>): string;