ShippingLineAssignmentStrategy

import {    Order,    OrderLine,    RequestContext,    ShippingLine,    ShippingLineAssignmentStrategy,} from '@vendure/core';export class DigitalShippingLineAssignmentStrategy implements ShippingLineAssignmentStrategy {    assignShippingLineToOrderLines(        ctx: RequestContext,        shippingLine: ShippingLine,        order: Order,    ): OrderLine[] | Promise<OrderLine[]> {        if (shippingLine.shippingMethod.customFields.isDigital) {            return order.lines.filter(l => l.productVariant.customFields.isDigital);        } else {            return order.lines.filter(l => !l.productVariant.customFields.isDigital);        }    }}

interface ShippingLineAssignmentStrategy extends InjectableStrategy {    assignShippingLineToOrderLines(        ctx: RequestContext,        shippingLine: ShippingLine,        order: Order,    ): OrderLine[] | Promise<OrderLine[]>;}