export function isNil(value: any): boolean;
export function isNull(value: any): boolean;
export function isUndefined(value: any): boolean;
export function isBoolean(value: any): value is boolean;
export function isNumber(value: any): value is number;
export function isString(value: any): value is string;
export function isStringNumber(value: any): boolean;
export function isObject(value: any): boolean;
export function isArray(value: any): value is any[];
export function isEmpty(value: any): boolean;
export function isElement(e: any): boolean;
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