extensions/css-language-features/server/src/customData.ts/fetchDataProviders
export function fetchDataProviders(dataPaths: string[], requestService: RequestService): Promise<ICSSDataProvider[]> {
	const providers = dataPaths.map(async p => {
		try {
			const content = await requestService.getContent(p);
			return parseCSSData(content);
		} catch (e) {
			return newCSSDataProvider({ version: 1 });
		}
	});

	return Promise.all(providers);
}