export declare const boolFilter: (value: boolean | undefined, defaults?: any) => any;
export declare const regexFilter: (value: string | undefined) => string | {
    $regex: string;
} | undefined;
export declare type Projection<T> = {
    [key in keyof T | "__v"]?: number;
};
export declare function removeUndefined(object: {
    [key: string]: any;
}, remove?: string[]): {
    [key: string]: any;
};
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