import { Schema } from 'mongoose';

interface BinData {
  type: number;
  data: Buffer | string;
}

const mySchema = new Schema({
  myField: {
    type: Schema.Types.Mixed,
    validate: {
      validator: function (v: number | BinData) {
        return typeof v === 'number' || (typeof v === 'object' && v !== null && 'type' in v && 'data' in v);
      },
      message: props => `${props.value} is not a valid value for myField`
    }
  }
});