Patch mongodb cursor.count to be used with mongo transactions

mongo-count.ts

import {MongoInternals} from 'meteor/mongo';

const RawCollection = MongoInternals.NpmModule.Collection;
const Cursor = MongoInternals.NpmModule.Cursor;
const CountDocumentsOperation = MongoInternals.NpmModule.Operations;

RawCollection.prototype.count = function (...args) {
    return this.countDocuments(...args);
};

const originalCount = Cursor.prototype.count;

Cursor.prototype.count = function (applySkipLimit, options, callback) {
    const MongoTransactionsPackage = Package['bhunjadi:mongo-transactions'];
    if (MongoTransactionsPackage.isInTransaction()) {
        const args = Array.prototype.slice.call(arguments, 0);
        callback = typeof args[args.length - 1] === 'function' ? args.pop() : undefined;
        options = typeof args[args.length - 1] === 'object' ? args.shift() || {} : {};
        applySkipLimit = args.length ? args.shift() ?? true : true;

        const {operation} = this;
        const {options: {db}, cmd: {find, limit, skip, query}} = operation;

        const col = db.collection(find);

        const countDocumentsOptions = {
            ...options,
            collation: this.cmd.collation,
        };

        if (applySkipLimit) {
            if (typeof this.cursorSkip() === 'number') countDocumentsOptions.skip = this.cursorSkip();
            if (typeof this.cursorLimit() === 'number') countDocumentsOptions.limit = this.cursorLimit();
        }
        return col.countDocuments(query, countDocumentsOptions, callback);
    }
    return originalCount.call(this, applySkipLimit, options, callback);
};