import { PaymentMethod, ExternalPaymentMethod } from '../types';
export declare function validateArg<V>(value: V, errorMessage: string): asserts value is NonNullable<V>;
export declare function validatePaymentMethods(paymentMethods: ExternalPaymentMethod[]): asserts paymentMethods is PaymentMethod[];
export declare function validatePaymentMethod(payment: ExternalPaymentMethod): asserts payment is PaymentMethod;
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