How to use the @here/harp-omv-datasource/index-worker.OmvTileDecoderService.start function in @here/harp-omv-datasource

* Copyright (C) 2017-2019 HERE Europe B.V.
 * Licensed under Apache 2.0, see full license in LICENSE
 * SPDX-License-Identifier: Apache-2.0
 */

declare let self: Worker & {
    importScripts(..._scripts: string[]): void;
};

self.importScripts("three.min.js");

import { GeoJsonTileDecoderService } from "@here/harp-geojson-datasource/index-worker";
import { OmvTileDecoderService, OmvTilerService } from "@here/harp-omv-datasource/index-worker";
import { CustomDecoderService } from "./custom_decoder";

OmvTileDecoderService.start();
OmvTilerService.start();
GeoJsonTileDecoderService.start();

//Following code is only needed for datasource_custom example.
// snippet:custom_datasource_example_custom_decoder_service_start.ts
CustomDecoderService.start();
// end:custom_datasource_example_custom_decoder_service_start.ts

/*
 * Copyright (C) 2017-2019 HERE Europe B.V.
 * Licensed under Apache 2.0, see full license in LICENSE
 * SPDX-License-Identifier: Apache-2.0
 */

declare let self: Worker & {
    importScripts(..._scripts: string[]): void;
};

self.importScripts("three.min.js");

import { OmvTileDecoderService, OmvTilerService } from "@here/harp-omv-datasource/index-worker";

OmvTileDecoderService.start();
OmvTilerService.start();