Promotion Action

// Applies a percentage discount to each OrderLineconst itemPercentageDiscount = new PromotionItemAction({    code: 'item_percentage_discount',    args: { discount: 'percentage' },    execute(ctx, orderLine, args) {        return -orderLine.unitPrice * (args.discount / 100);    },    description: 'Discount every item by { discount }%',});

class PromotionItemAction<T extends ConfigArgs = ConfigArgs, U extends Array<PromotionCondition<any>> = []> extends PromotionAction<T, U> {    constructor(config: PromotionItemActionConfig<T, U>)}

// Applies a percentage discount to the entire Orderconst orderPercentageDiscount = new PromotionOrderAction({    code: 'order_percentage_discount',    args: { discount: 'percentage' },    execute(ctx, order, args) {        return -order.subTotal * (args.discount / 100);    },    description: 'Discount order by { discount }%',});

class PromotionOrderAction<T extends ConfigArgs = ConfigArgs, U extends PromotionCondition[] = []> extends PromotionAction<T, U> {    constructor(config: PromotionOrderActionConfig<T, U>)}

class PromotionShippingAction<T extends ConfigArgs = ConfigArgs, U extends PromotionCondition[] = []> extends PromotionAction<T, U> {    constructor(config: PromotionShippingActionConfig<T, U>)}

type ExecutePromotionItemActionFn<T extends ConfigArgs, U extends Array<PromotionCondition<any>>> = (    ctx: RequestContext,    orderLine: OrderLine,    args: ConfigArgValues<T>,    state: ConditionState<U>,    promotion: Promotion,) => number | Promise<number>

type ExecutePromotionLineActionFn<T extends ConfigArgs, U extends Array<PromotionCondition<any>>> = (    ctx: RequestContext,    orderLine: OrderLine,    args: ConfigArgValues<T>,    state: ConditionState<U>,    promotion: Promotion,) => number | Promise<number>

type ExecutePromotionOrderActionFn<T extends ConfigArgs, U extends Array<PromotionCondition<any>>> = (    ctx: RequestContext,    order: Order,    args: ConfigArgValues<T>,    state: ConditionState<U>,    promotion: Promotion,) => number | Promise<number>

type ExecutePromotionShippingActionFn<T extends ConfigArgs, U extends Array<PromotionCondition<any>>> = (    ctx: RequestContext,    shippingLine: ShippingLine,    order: Order,    args: ConfigArgValues<T>,    state: ConditionState<U>,    promotion: Promotion,) => number | Promise<number>

type PromotionActionSideEffectFn<T extends ConfigArgs> = (    ctx: RequestContext,    order: Order,    args: ConfigArgValues<T>,    promotion: Promotion,) => void | Promise<void>

interface PromotionActionConfig<T extends ConfigArgs, U extends Array<PromotionCondition<any>> | undefined> extends ConfigurableOperationDefOptions<T> {    priorityValue?: number;    conditions?: U extends undefined ? undefined : ConditionTuple<Exclude<U, undefined>>;    onActivate?: PromotionActionSideEffectFn<T>;    onDeactivate?: PromotionActionSideEffectFn<T>;}

interface PromotionItemActionConfig<T extends ConfigArgs, U extends PromotionCondition[]> extends PromotionActionConfig<T, U> {    execute: ExecutePromotionItemActionFn<T, U>;}

interface PromotionLineActionConfig<T extends ConfigArgs, U extends PromotionCondition[]> extends PromotionActionConfig<T, U> {    execute: ExecutePromotionLineActionFn<T, U>;}

interface PromotionOrderActionConfig<T extends ConfigArgs, U extends PromotionCondition[]> extends PromotionActionConfig<T, U> {    execute: ExecutePromotionOrderActionFn<T, U>;}

interface PromotionShippingActionConfig<T extends ConfigArgs, U extends PromotionCondition[]> extends PromotionActionConfig<T, U> {    execute: ExecutePromotionShippingActionFn<T, U>;}

// Applies a percentage discount to each OrderLineconst linePercentageDiscount = new PromotionLineAction({    code: 'line_percentage_discount',    args: { discount: 'percentage' },    execute(ctx, orderLine, args) {        return -orderLine.linePrice * (args.discount / 100);    },    description: 'Discount every line by { discount }%',});

class PromotionLineAction<T extends ConfigArgs = ConfigArgs, U extends Array<PromotionCondition<any>> = []> extends PromotionAction<T, U> {    constructor(config: PromotionLineActionConfig<T, U>)}