import { GraphQLResolveInfo, GraphQLSchema } from 'graphql';
import { IRateLimiterOptions, RateLimiterAbstract, RateLimiterRes } from 'rate-limiter-flexible';
type MaybePromise<T> = Promise<T> | T;
/**
 * Configure rate limit field behaviour.
 */
export type RateLimitArgs = {
    /**
     * Number of occurrences allowed over duration.
     */
    limit: number;
    /**
     * Number of seconds before limit is reset.
     */
    duration: number;
};
/**
 * Override specific aspects of rate limit field behaviour.
 */
export type RateLimitExtensions<TContext> = {
    /**
     * Constructs a key to represent an operation on the field.
     */
    keyGenerator?: RateLimitKeyGenerator<TContext>;
    /**
     * Calculate the number of points to consume.
     */
    pointsCalculator?: RateLimitPointsCalculator<TContext>;
    /**
     * Behaviour when limit is exceeded.
     */
    onLimit?: RateLimitOnLimit<TContext>;
    /**
     * If rate limiter information for request should be stored in context, how to record it.
     */
    setState?: RateLimitSetState<TContext>;
};
export type RateLimitKeyGenerator<TContext> = (directiveArgs: RateLimitArgs, source: unknown, args: {
    [key: string]: unknown;
}, context: TContext, info: GraphQLResolveInfo) => MaybePromise<string>;
export type RateLimitPointsCalculator<TContext> = (directiveArgs: RateLimitArgs, source: unknown, args: {
    [key: string]: unknown;
}, context: TContext, info: GraphQLResolveInfo) => MaybePromise<number>;
export type RateLimitOnLimit<TContext> = (response: RateLimiterRes, directiveArgs: RateLimitArgs, source: unknown, args: {
    [key: string]: unknown;
}, context: TContext, info: GraphQLResolveInfo) => MaybePromise<unknown>;
export type RateLimitSetState<TContext> = (response: RateLimiterRes, directiveArgs: RateLimitArgs, source: unknown, args: {
    [key: string]: unknown;
}, context: TContext, info: GraphQLResolveInfo) => void;
/**
 * Configure rate limit behaviour.
 */
export interface RateLimitOptions<TContext, TLimiterOptions extends IRateLimiterOptions> {
    /**
     * Name of the directive.
     */
    name?: string;
    /**
     * Default value for argument limit.
     */
    defaultLimit?: string;
    /**
     * Default value for argument duration.
     */
    defaultDuration?: string;
    /**
     * Constructs a key to represent an operation on a field.
     */
    keyGenerator?: RateLimitKeyGenerator<TContext>;
    /**
     * Calculate the number of points to consume.
     */
    pointsCalculator?: RateLimitPointsCalculator<TContext>;
    /**
     * Behaviour when limit is exceeded.
     */
    onLimit?: RateLimitOnLimit<TContext>;
    /**
     * If rate limiter information for request should be stored in context, how to record it.
     */
    setState?: RateLimitSetState<TContext>;
    /**
     * An implementation of a limiter.
     */
    limiterClass?: typeof RateLimiterAbstract;
    /**
     * Configuration to apply to created limiters.
     */
    limiterOptions?: Pick<TLimiterOptions, Exclude<keyof TLimiterOptions, keyof {
        points?: number;
        duration?: number;
    }>>;
}
/**
 * Implementation of a rate limit schema directive.
 */
export interface RateLimitDirective {
    /**
     * Schema Definition Language (SDL) representation of the directive.
     */
    rateLimitDirectiveTypeDefs: string;
    /**
     * Function to apply the directive's logic to the provided schema.
     */
    rateLimitDirectiveTransformer: (schema: GraphQLSchema) => GraphQLSchema;
}
/**
 * Convert milliseconds to seconds.
 * @param duration Milliseconds.
 */
export declare function millisecondsToSeconds(duration: number): number;
/**
 * Human readable string that uniquely identifies a schema element within a GraphQL Schema.
 * @param info Holds field-specific information relevant to the current operation as well as the schema details.
 */
export declare function getSchemaCoordinate(info: GraphQLResolveInfo): string;
/**
 * Get a value to uniquely identify a field in a schema.
 * @param directiveArgs The arguments defined in the schema for the directive.
 * @param source The previous result returned from the resolver on the parent field.
 * @param args The arguments provided to the field in the GraphQL operation.
 * @param context Contains per-request state shared by all resolvers in a particular operation.
 * @param info Holds field-specific information relevant to the current operation as well as the schema details.
 */
export declare function defaultKeyGenerator<TContext>(directiveArgs: RateLimitArgs, source: unknown, args: {
    [key: string]: unknown;
}, context: TContext, info: GraphQLResolveInfo): string;
/**
 * Calculate the number of points to consume.
 * @param directiveArgs The arguments defined in the schema for the directive.
 * @param source The previous result returned from the resolver on the parent field.
 * @param args The arguments provided to the field in the GraphQL operation.
 * @param context Contains per-request state shared by all resolvers in a particular operation.
 * @param info Holds field-specific information relevant to the current operation as well as the schema details.
 */
export declare function defaultPointsCalculator<TContext>(directiveArgs: RateLimitArgs, source: unknown, args: {
    [key: string]: unknown;
}, context: TContext, info: GraphQLResolveInfo): number;
/**
 * Raise a rate limit error when there are too many requests.
 * @param response The current rate limit information for this field.
 * @param directiveArgs The arguments defined in the schema for the directive.
 * @param source The previous result returned from the resolver on the parent field.
 * @param args The arguments provided to the field in the GraphQL operation.
 * @param context Contains per-request state shared by all resolvers in a particular operation.
 * @param info Holds field-specific information relevant to the current operation as well as the schema details.
 */
export declare function defaultOnLimit<TContext>(response: RateLimiterRes, directiveArgs: RateLimitArgs, source: unknown, args: {
    [key: string]: unknown;
}, context: TContext, info: GraphQLResolveInfo): unknown;
/**
 * Write directive state into context.
 * @param name Key of rate limit state in context, likely the directive's name.
 */
export declare function defaultSetState<TContext>(name?: string): RateLimitSetState<TContext>;
/**
 * Create an implementation of a rate limit directive.
 */
export declare function rateLimitDirective<TContext, TLimiterOptions extends IRateLimiterOptions = IRateLimiterOptions>({ name, defaultLimit, defaultDuration, keyGenerator, pointsCalculator, onLimit, setState, limiterClass, limiterOptions, }?: RateLimitOptions<TContext, TLimiterOptions>): RateLimitDirective;
export {};