How to use the rxdb/plugins/core.plugin function in rxdb

import RxDB from 'rxdb/plugins/core';

RxDB.plugin(require('pouchdb-adapter-idb'));
import RxDBReplicationGraphQL from 'rxdb/plugins/replication-graphql';
RxDB.plugin(RxDBReplicationGraphQL);


// TODO import these only in non-production build
import RxDBSchemaCheckModule from 'rxdb/plugins/schema-check';
RxDB.plugin(RxDBSchemaCheckModule);
import RxDBErrorMessagesModule from 'rxdb/plugins/error-messages';
RxDB.plugin(RxDBErrorMessagesModule);
import RxDBValidateModule from 'rxdb/plugins/validate';
RxDB.plugin(RxDBValidateModule);

import {
    GRAPHQL_PORT,
    GRAPHQL_PATH,
    GRAPHQL_SUBSCRIPTION_PORT,
    GRAPHQL_SUBSCRIPTION_PATH
} from '../shared';

const insertButton = document.querySelector('#insert-button');
const heroesList = document.querySelector('#heroes-list');
const leaderIcon = document.querySelector('#leader-icon');

const heroSchema = {
    version: 0,
    type: 'object',
    properties: {

import './style.css';
import {
    SubscriptionClient
} from 'subscriptions-transport-ws';


import RxDB from 'rxdb/plugins/core';

RxDB.plugin(require('pouchdb-adapter-idb'));
import RxDBReplicationGraphQL from 'rxdb/plugins/replication-graphql';
RxDB.plugin(RxDBReplicationGraphQL);


// TODO import these only in non-production build
import RxDBSchemaCheckModule from 'rxdb/plugins/schema-check';
RxDB.plugin(RxDBSchemaCheckModule);
import RxDBErrorMessagesModule from 'rxdb/plugins/error-messages';
RxDB.plugin(RxDBErrorMessagesModule);
import RxDBValidateModule from 'rxdb/plugins/validate';
RxDB.plugin(RxDBValidateModule);

import {
    GRAPHQL_PORT,
    GRAPHQL_PATH,
    GRAPHQL_SUBSCRIPTION_PORT,

async function loadRxDBPlugins(): Promise {


    RxDB.plugin(RxDBLeaderElectionModule);

    RxDB.plugin(RxDBReplicationModule);
    // http-adapter is always needed for replication with the node-server
    RxDB.plugin(PouchdbAdapterHttp);

    /**
     * indexed-db adapter
     */
    RxDB.plugin(PouchdbAdapterIdb);

    /**
     * to reduce the build-size,
     * we use some modules in dev-mode only
     */
    if (isDevMode()) {
        await Promise.all([

            // schema-checks should be used in dev-mode only

// batteries-included
// import RxDB from 'rxdb';

/**
 * custom build
 */
import RxDB from 'rxdb/plugins/core';

// import modules
import RxDBSchemaCheckModule from 'rxdb/plugins/schema-check';
import RxDBErrorMessagesModule from 'rxdb/plugins/error-messages';

if (process.env.NODE_ENV === 'development') {
    // in dev-mode we show full error-messages
    RxDB.plugin(RxDBErrorMessagesModule);

    // schema-checks should be used in dev-mode only
    RxDB.plugin(RxDBSchemaCheckModule);
}

import RxDBValidateModule from 'rxdb/plugins/validate';
RxDB.plugin(RxDBValidateModule);

import RxDBLeaderElectionModule from 'rxdb/plugins/leader-election';
RxDB.plugin(RxDBLeaderElectionModule);

import RxDBReplicationModule from 'rxdb/plugins/replication';
RxDB.plugin(RxDBReplicationModule);
// always needed for replication with the node-server
import * as PouchdbAdapterHttp from 'pouchdb-adapter-http';
RxDB.plugin(PouchdbAdapterHttp);

import RxDBValidateModule from 'rxdb/plugins/validate';
RxDB.plugin(RxDBValidateModule);

import RxDBLeaderElectionModule from 'rxdb/plugins/leader-election';
RxDB.plugin(RxDBLeaderElectionModule);

import RxDBReplicationModule from 'rxdb/plugins/replication';
RxDB.plugin(RxDBReplicationModule);
// always needed for replication with the node-server
import * as PouchdbAdapterHttp from 'pouchdb-adapter-http';
RxDB.plugin(PouchdbAdapterHttp);


import * as PouchdbAdapterIdb from 'pouchdb-adapter-idb';
RxDB.plugin(PouchdbAdapterIdb);
const useAdapter = 'idb';


let collections = [
    {
        name: 'hero',
        schema: heroSchema,
        methods: {
            hpPercent(this: RxHeroDocument): number {
                return this.hp / this.maxHP * 100;
            }
        },
        sync: true
    }
];

import RxDB from 'rxdb/plugins/core';

// import modules
import RxDBSchemaCheckModule from 'rxdb/plugins/schema-check';
import RxDBErrorMessagesModule from 'rxdb/plugins/error-messages';

if (process.env.NODE_ENV === 'development') {
    // in dev-mode we show full error-messages
    RxDB.plugin(RxDBErrorMessagesModule);

    // schema-checks should be used in dev-mode only
    RxDB.plugin(RxDBSchemaCheckModule);
}

import RxDBValidateModule from 'rxdb/plugins/validate';
RxDB.plugin(RxDBValidateModule);

import RxDBLeaderElectionModule from 'rxdb/plugins/leader-election';
RxDB.plugin(RxDBLeaderElectionModule);

import RxDBReplicationModule from 'rxdb/plugins/replication';
RxDB.plugin(RxDBReplicationModule);
// always needed for replication with the node-server
import * as PouchdbAdapterHttp from 'pouchdb-adapter-http';
RxDB.plugin(PouchdbAdapterHttp);


import * as PouchdbAdapterIdb from 'pouchdb-adapter-idb';
RxDB.plugin(PouchdbAdapterIdb);
const useAdapter = 'idb';

import RxDB from 'rxdb/plugins/core';

// import modules
import RxDBSchemaCheckModule from 'rxdb/plugins/schema-check';
import RxDBErrorMessagesModule from 'rxdb/plugins/error-messages';

if (ENV === 'development') {
    // in dev-mode we show full error-messages
    RxDB.plugin(RxDBErrorMessagesModule);

    // schema-checks should be used in dev-mode only
    RxDB.plugin(RxDBSchemaCheckModule);
}

import RxDBValidateModule from 'rxdb/plugins/validate';
RxDB.plugin(RxDBValidateModule);

import RxDBLeaderElectionModule from 'rxdb/plugins/leader-election';
RxDB.plugin(RxDBLeaderElectionModule);

import RxDBReplicationModule from 'rxdb/plugins/replication';
RxDB.plugin(RxDBReplicationModule);
// always needed for replication with the node-server
import * as PouchdbAdapterHttp from 'pouchdb-adapter-http';
RxDB.plugin(PouchdbAdapterHttp);


import * as PouchdbAdapterIdb from 'pouchdb-adapter-idb';
RxDB.plugin(PouchdbAdapterIdb);
const useAdapter = 'idb';

// in dev-mode we show full error-messages
            // instead of RxErrors with theirs keys
            import('rxdb/plugins/error-messages').then(
                module => RxDB.plugin(module)
            ),

            // we use the schema-validation only in dev-mode
            // this validates each document if it is matching the jsonschema
            import('rxdb/plugins/validate').then(
                module => RxDB.plugin(module)
            )
        ]);
    } else {
        // in production we use the no-validate module instead of the schema-validation
        // to reduce the build-size
        RxDB.plugin(RxDBNoValidateModule);
    }

}

async function loadRxDBPlugins(): Promise {


    RxDB.plugin(RxDBLeaderElectionModule);

    RxDB.plugin(RxDBReplicationModule);
    // http-adapter is always needed for replication with the node-server
    RxDB.plugin(PouchdbAdapterHttp);

    /**
     * indexed-db adapter
     */
    RxDB.plugin(PouchdbAdapterIdb);

    /**
     * to reduce the build-size,
     * we use some modules in dev-mode only
     */
    if (isDevMode()) {
        await Promise.all([

import * as PouchdbAdapterIdb from 'pouchdb-adapter-idb';
import {RxCollection, RxDatabase, RxDocument} from 'rxdb';
import RxDB from 'rxdb/plugins/core';
import UpdatePlugin from 'rxdb/plugins/update';
import RxDBErrorMessagesModule from 'rxdb/plugins/error-messages';
import * as dumpPlugin from 'rxdb/plugins/json-dump';
import RxDBValidateModule from 'rxdb/plugins/validate';
import {Observable, of} from 'rxjs';
import {NgxRxdbCollectionConfig, NgxRxdbConfig, NgxRxdbDump} from './ngx-rxdb.interface';
import {NgxRxdbCollectionCreator} from './ngx-rxdb-collection.class';
import {promiseTimeout} from '../../util/promise-timeout';

RxDB.plugin(RxDBErrorMessagesModule);
RxDB.plugin(dumpPlugin);
RxDB.plugin(UpdatePlugin);
RxDB.plugin(RxDBValidateModule);
RxDB.plugin(PouchdbAdapterIdb);

const DEFAULT_ADAPTER = 'idb';
const DEFAULT_CONFIG = {
  name: 'default_name_please_change',
  adapter: DEFAULT_ADAPTER,
  multiInstance: true,
  queryChangeDetection: false,
  ignoreDuplicate: true,
};

@Injectable()
export class NgxRxdbService implements OnDestroy {
  private _dbInstance: RxDatabase;

  get db(): RxDatabase {