export declare function isString(value: unknown): value is string;
export declare function isBigInt(value: any): value is bigint;
export declare function isBoolean(value: unknown): value is boolean;
export declare const isUndefined: (value: unknown) => value is undefined;
export declare function isNumber(value: unknown): value is number;
export declare function isObject(item: unknown | undefined): boolean;
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