//#region src/utils.d.ts
declare function addProperties<O extends NonNullable<unknown>, I extends NonNullable<unknown>, M extends NonNullable<unknown>>(target: O, immutable: I, mutable?: M): O & M & Readonly<I>;
/** asserts: input must be string */
declare function assertString(input: unknown, name: string): asserts input is string;
/** asserts: string must not be empty */
declare function assertNonEmptyString(input: unknown, name: string): asserts input is string;
/** asserts: string must not be blank */
declare function assertNonBlankString(input: unknown, name: string): asserts input is string;
/** asserts: input must be number */
declare function assertNumber(input: unknown, name: string): asserts input is number;
/** asserts: input must be array */
declare function assertArray(input: unknown, name: string): asserts input is any[];
/** asserts: input must be object */
declare function assertObject(input: unknown, name: string): asserts input is NonNullable<object>;
declare const error: {
  inGumroadRequest(e: unknown, message: string): boolean;
  isProductNotFound(e: unknown): false | {
    error: string;
    code: "product_not_found";
  };
  isCoverNotFound(e: unknown): false | {
    error: string;
    code: "cover_not_found";
  };
  isVariantCategoryNotFound(e: unknown): false | {
    error: string;
    code: "variant_category_not_found";
  };
  isOfferCodeNotFound(e: unknown): false | {
    error: string;
    code: "offer_code_not_found";
  };
  isLicenseNotFound(e: unknown): false | {
    error: string;
    code: "license_not_found";
  };
  isSubscriberNotFound(e: unknown): false | {
    error: string;
    code: "subscriber_not_found";
  };
  isResourceSubscriptionNotFound(e: unknown): false | {
    error: string;
    code: "resource_subscription_not_found";
  };
  isSaleNotFound(e: unknown): false | {
    error: string;
    code: "sale_not_found";
  };
  isPayoutNotFound(e: unknown): false | {
    error: string;
    code: "payout_not_found";
  };
  isTaxFormNotFound(e: unknown): false | {
    error: string;
    code: "tax_form_not_found";
  };
  isAnyNotFound(e: unknown): false | {
    error: string;
    code: "product_not_found";
  } | {
    error: string;
    code: "cover_not_found";
  } | {
    error: string;
    code: "variant_category_not_found";
  } | {
    error: string;
    code: "offer_code_not_found";
  } | {
    error: string;
    code: "license_not_found";
  } | {
    error: string;
    code: "subscriber_not_found";
  } | {
    error: string;
    code: "resource_subscription_not_found";
  } | {
    error: string;
    code: "sale_not_found";
  } | {
    error: string;
    code: "payout_not_found";
  } | {
    error: string;
    code: "tax_form_not_found";
  };
};
declare function formatCustomField<T extends {
  custom_fields: unknown;
}>(input: T): T;
//#endregion
export { addProperties, assertArray, assertNonBlankString, assertNonEmptyString, assertNumber, assertObject, assertString, error, formatCustomField };
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