woocommerce/plugins/woocommerce-admin/client/lib/currency-context.js

/**
 * External dependencies
 */
import { createContext } from '@wordpress/element';
import { applyFilters } from '@wordpress/hooks';
import CurrencyFactory from '@woocommerce/currency';
/**
 * Internal dependencies
 */
import { CURRENCY } from '~/utils/admin-settings';

const appCurrency = CurrencyFactory( CURRENCY );

export const getFilteredCurrencyInstance = ( query ) => {
	const config = appCurrency.getCurrencyConfig();
	/**
	 * Filter the currency context. This affects all WooCommerce Admin currency formatting.
	 *
	 * @filter woocommerce_admin_report_currency
	 * @param {Object} config Currency configuration.
	 * @param {Object} query  Url query parameters.
	 */
	const filteredConfig = applyFilters(
		'woocommerce_admin_report_currency',
		config,
		query
	);
	return CurrencyFactory( filteredConfig );
};

export const CurrencyContext = createContext(
	appCurrency // default value
);