| 1 | import { ValidationOptions } from '../ValidationOptions';
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| 2 | export type IsISBNVersion = '10' | '13' | 10 | 13;
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| 3 | export declare const IS_ISBN = "isIsbn";
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| 4 | /**
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| 5 | * Checks if the string is an ISBN (version 10 or 13).
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| 6 | * If given value is not a string, then it returns false.
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| 7 | */
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| 8 | export declare function isISBN(value: unknown, version?: IsISBNVersion): boolean;
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| 9 | /**
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| 10 | * Checks if the string is an ISBN (version 10 or 13).
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| 11 | * If given value is not a string, then it returns false.
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| 12 | */
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| 13 | export declare function IsISBN(version?: IsISBNVersion, validationOptions?: ValidationOptions): PropertyDecorator;
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