export declare function isFunction(val: unknown): val is Function;
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export declare const isString: (val: unknown) => val is string;
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export declare const isNull: <T>(value: T) => value is null;
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export declare const isUndefined: <T>(value: T) => value is undefined;
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export declare function isDef(value: unknown): boolean;
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export declare function isInteger(value: unknown): boolean;
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export declare function isNumeric(value: unknown): boolean;
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export declare function isNumber(value: unknown): boolean;
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export declare function isBoolean(value: unknown): value is boolean;
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export declare function isObject(x: unknown): x is Record<string, unknown>;
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export declare function isPlainObject(val: unknown): val is Record<string, unknown>;
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export declare function isEmpty(val: unknown): boolean;
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export declare function isDate(input: unknown, options?: {
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format?: string;
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delimiters?: string[];
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strictMode?: boolean;
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}): boolean;
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export declare function isEmail(str: unknown): boolean;
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export declare function isURL(str: unknown, options?: {
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protocols?: string[];
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require_tld?: boolean;
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require_protocol?: boolean;
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require_host?: boolean;
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allow_protocol_relative_urls?: boolean;
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}): boolean;
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