Method apply

src/write_concern.ts:118–126

* Apply a write concern to a command document. Will modify and return the command.

(command: Document, writeConcern: WriteConcern)

   * Apply a write concern to a command document. Will modify and return the command.
   */
  static apply(command: Document, writeConcern: WriteConcern): Document {
    const wc: CommandWriteConcernOptions = {};
    class="cm">// The write concern document sent to the server has w/wtimeout/j fields.
    if (writeConcern.w != null) wc.w = writeConcern.w;
    if (writeConcern.wtimeoutMS != null) wc.wtimeout = writeConcern.wtimeoutMS;
    if (writeConcern.journal != null) wc.j = writeConcern.j;
    command.writeConcern = wc;
    return command;
  }

  /** Construct a WriteConcern given an options object. */
  static fromOptions(