typescript declarations for parent application from npm module

index.d.ts

// ./custom_types/performanceEntry'
declare global {
  export interface PerformanceEntry {
    transferSize: number,
    encodedBodySize: number,
    decodedBodySize: number,
    responseStart: number,
    responseEnd: number,
    requestStart: number,
    attribution: Array<any>,
  }
}

export declare const PerformanceEntry: PerformanceEntry;

// index.d.ts
import wrapGraphqlRequest from './helpers/wrap_graphql_request';
// type declared in another file
import { PerformanceMetricsConfigs } from './services/elastic_apm_rum';

export { PerformanceMetricsUser } from './services/elastic_apm_rum';

// this provides type dependencies to the parent application
export * from './custom_types/performanceEntry';

// export api for the module
declare function initialize(initializeConfigs: PerformanceMetricsConfigs): undefined;
export { wrapGraphqlRequest, initialize as rumInitialize };