/** @public */
export declare type W = number | 'majority';
/** @public */
export interface WriteConcernOptions {
    /** Write Concern as an object */
    writeConcern?: WriteConcern | WriteConcernSettings;
}
/** @public */
export interface WriteConcernSettings {
    /** The write concern */
    w?: W;
    /** The write concern timeout */
    wtimeoutMS?: number;
    /** The journal write concern */
    journal?: boolean;
    /** The journal write concern */
    j?: boolean;
    /** The write concern timeout */
    wtimeout?: number;
    /** The file sync write concern */
    fsync?: boolean | 1;
}
export declare const WRITE_CONCERN_KEYS: string[];
/**
 * A MongoDB WriteConcern, which describes the level of acknowledgement
 * requested from MongoDB for write operations.
 * @public
 *
 * @see https://docs.mongodb.com/manual/reference/write-concern/
 */
export declare class WriteConcern {
    /** request acknowledgment that the write operation has propagated to a specified number of mongod instances or to mongod instances with specified tags. */
    w?: W;
    /** specify a time limit to prevent write operations from blocking indefinitely */
    wtimeout?: number;
    /** request acknowledgment that the write operation has been written to the on-disk journal */
    j?: boolean;
    /** equivalent to the j option */
    fsync?: boolean | 1;
    /**
     * Constructs a WriteConcern from the write concern properties.
     * @param w - request acknowledgment that the write operation has propagated to a specified number of mongod instances or to mongod instances with specified tags.
     * @param wtimeout - specify a time limit to prevent write operations from blocking indefinitely
     * @param j - request acknowledgment that the write operation has been written to the on-disk journal
     * @param fsync - equivalent to the j option
     */
    constructor(w?: W, wtimeout?: number, j?: boolean, fsync?: boolean | 1);
    /** Construct a WriteConcern given an options object. */
    static fromOptions(options?: WriteConcernOptions | WriteConcern | W, inherit?: WriteConcernOptions | WriteConcern): WriteConcern | undefined;
}
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