export declare const isString: (value: unknown) => value is string;
export declare const isObject: (value: unknown) => value is {
    [key: string | number | symbol]: unknown;
};
export declare const isDefined: <T>(value: unknown) => value is NonNullable<T>;
export declare const first: <T = unknown>(value?: T | T[] | null) => T | undefined;
export declare const ensureArray: <T = unknown>(value?: T | T[] | null) => Array<T>;
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