@splitsoftware/splitio-commons/src/sdkFactory/types.ts

Split JavaScript SDK common components

import { IIntegrationManager, IIntegrationFactoryParams } from '../integrations/types';
import { ISignalListener } from '../listeners/types';
import { IReadinessManager, ISdkReadinessManager } from '../readiness/types';
import type { sdkManagerFactory } from '../sdkManager';
import { serviceApiFactory } from '../services/serviceApi';
import type { IFallbackCalculator } from '../evaluator/fallbackTreatmentsCalculator';
import { IFetch, IServiceApi, IEventSourceConstructor } from '../services/types';
import { IStorageAsync, IStorageSync, IStorageFactoryParams } from '../storages/types';
import { ISyncManager } from '../sync/types';
import { IImpressionObserver } from '../trackers/impressionObserver/types';
import { IImpressionsTracker, IEventTracker, ITelemetryTracker, IFilterAdapter } from '../trackers/types';
import { ISettings } from '../types';
import SplitIO from '../../types/splitio';

/**
 * Environment related dependencies.
 */
export interface IPlatform {
  /**
   * If provided, it is used to retrieve the Fetch API for HTTP requests. Otherwise, the global fetch is used.
   */
  getFetch?: (settings: ISettings) => (IFetch | undefined)
  /**
   * If provided, it is used to pass additional options to fetch and eventsource calls.
   */
  getOptions?: (settings: ISettings) => (object | undefined)
  /**
   * If provided, it is used to retrieve the EventSource constructor for streaming support.
   */
  getEventSource?: (settings: ISettings) => (IEventSourceConstructor | undefined)
  /**
   * EventEmitter constructor, like Node.js EventEmitter or a polyfill.
   */
  EventEmitter: new () => SplitIO.IEventEmitter,
  /**
   * Function used to track latencies for telemetry.
   */
  now?: () => number,
  /**
   * Optional signal listener constructor. Used to listen and handle runtime environment states, like server shutdown, app paused or resumed.
   */
  // eslint-disable-next-line no-use-before-define
  SignalListener?: new (params: ISdkFactoryContext) => ISignalListener, // Used by BrowserSignalListener
}

// Definition type
export type EntityType = 'config' | 'flag';

export interface ISdkFactoryContext {
  platform: IPlatform,
  sdkReadinessManager: ISdkReadinessManager,
  readiness: IReadinessManager,
  settings: ISettings
  impressionsTracker: IImpressionsTracker,
  eventTracker: IEventTracker,
  telemetryTracker: ITelemetryTracker,
  storage: IStorageSync | IStorageAsync,
  serviceApi?: IServiceApi,
  syncManager?: ISyncManager,
  clients: Record<string, SplitIO.IBasicClient>,
  fallbackCalculator: IFallbackCalculator,
  entityType?: EntityType
}

export interface ISdkFactoryContextSync extends ISdkFactoryContext {
  storage: IStorageSync,
  serviceApi: IServiceApi
  syncManager: ISyncManager,
}

export interface ISdkFactoryContextAsync extends ISdkFactoryContext {
  storage: IStorageAsync,
  serviceApi: undefined,
  syncManager: undefined
}

/**
 * Object parameter with the modules required to create an SDK factory instance
 */
export interface ISdkFactoryParams {
  // If true, the `sdkFactory` is pure (no side effects), and the SDK instance includes a `init` method to run initialization side effects
  lazyInit?: boolean,

  // The settings must be already validated
  settings: ISettings,

  // Platform dependencies
  platform: IPlatform,

  // Storage factory. The result storage type implies the type of the SDK:
  // sync SDK (`IBrowserSDK` and `ISDK`) with `IStorageSync`, and async SDK (`IBrowserAsyncSDK` and `IAsyncSDK`) with `IStorageAsync`
  storageFactory: (params: IStorageFactoryParams) => IStorageSync | IStorageAsync,

  // Factory of ServiceApi (HTTP Client Service).
  // It is not required when providing an asynchronous storage or offline SyncManager
  serviceApiFactory?: typeof serviceApiFactory,

  // SyncManager factory.
  // Not required when providing an asynchronous storage (consumer mode), but required in standalone mode to avoid SDK timeout.
  // It can create an offline or online sync manager, with or without streaming support.
  syncManagerFactory?: (params: ISdkFactoryContextSync) => ISyncManager,

  // Sdk manager factory
  sdkManagerFactory: typeof sdkManagerFactory,

  // Sdk client method factory.
  // It Allows to distinguish SDK clients with the client-side API (`IBrowserSDK` and `IBrowserAsyncSDK`) or server-side API (`ISDK` and `IAsyncSDK`).
  sdkClientMethodFactory: (params: ISdkFactoryContext) => ({ (): SplitIO.IBrowserClient; (key: SplitIO.SplitKey): SplitIO.IBrowserClient; } | (() => SplitIO.IClient) | (() => SplitIO.IAsyncClient))

  // Impression observer factory.
  impressionsObserverFactory: () => IImpressionObserver

  filterAdapterFactory?: () => IFilterAdapter

  // @TODO review impressionListener and integrations interfaces. What about handling impressionListener as an integration ?
  integrationsManagerFactory?: (params: IIntegrationFactoryParams) => IIntegrationManager | undefined,

  // Optional function to assign additional properties to the factory instance
  extraProps?: (params: ISdkFactoryContext) => object
}