allow QueryOptions populate parameter type PopulateOptions

[osmanakol]

Summary
Mongoose 5.10.x version QueryOptions method populate property type allow to use string, ModelPopulateOptions. This make it easy to develop generic mongoose crud operation. I checked and realized after mongoose version 5.10.x some method is changed. I changed to populate property type for adapt new version.

Examples
Mongoose 5.10.x index.d.ts :

interface QueryFindBaseOptions {
        /** Sets a default collation for every query and aggregation. */
        collation?: CollationOptions;
        explain?: any;
        lean?: boolean;
        populate?: string | ModelPopulateOptions;
        /** like select, it determines which fields to return */
        projection?: any;
        /** use client session for transaction */
        session?: ClientSession;
    }

Mongoose 5.13.7 index.d.ts :

  interface QueryOptions {
    arrayFilters?: { [key: string]: any }[];
    batchSize?: number;
    collation?: mongodb.CollationDocument;
    comment?: any;
    context?: string;
    explain?: any;
    fields?: any | string;
    hint?: any;
    /**
     * If truthy, mongoose will return the document as a plain JavaScript object rather than a mongoose document.
     */
    lean?: boolean | any;
    limit?: number;
    maxTimeMS?: number;
    maxscan?: number;
    multi?: boolean;
    multipleCastError?: boolean;
    /**
     * By default, `findOneAndUpdate()` returns the document as it was **before**
     * `update` was applied. If you set `new: true`, `findOneAndUpdate()` will
     * instead give you the object after `update` was applied.
     */
    new?: boolean;
    omitUndefined?: boolean;
    overwrite?: boolean;
    overwriteDiscriminatorKey?: boolean;
    populate?: string | string[] | PopulateOptions | PopulateOptions[];
    projection?: any;
    /**
     * if true, returns the raw result from the MongoDB driver
     */
    rawResult?: boolean;
    readPreference?: mongodb.ReadPreferenceMode;
    /**
     * An alias for the `new` option. `returnOriginal: false` is equivalent to `new: true`.
     */
    returnOriginal?: boolean;
    /**
     * Another alias for the `new` option. `returnOriginal` is deprecated so this should be used.
     */
    returnDocument?: string;
    runValidators?: boolean;
    sanitizeProjection?: boolean;
    /** The session associated with this query. */
    session?: mongodb.ClientSession;
    setDefaultsOnInsert?: boolean;
    skip?: number;
    snapshot?: any;
    sort?: any;
    /** overwrites the schema's strict mode option */
    strict?: boolean | string;
    tailable?: number;
    /**
     * If set to `false` and schema-level timestamps are enabled,
     * skip timestamps for this update. Note that this allows you to overwrite
     * timestamps. Does nothing if schema-level timestamps are not set.
     */
    timestamps?: boolean;
    upsert?: boolean;
    useFindAndModify?: boolean;
    writeConcern?: any;
  }

I changed populate method :

// Before : 
populate: string
// After:
populate?: string | string[] | PopulateOptions | PopulateOptions[];

Through of this change We can use the find method as in the 5.10.x version:
find(FilterQuery<T>, projection ,options?: {populate:{path:"<relation path>, model:<relation db schema>"}}) .

[vkarpov15]

Thanks!