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import {httpRequest} from './http-request';import type {HTTPRequestInfo} from './http-request-info';
/** * Pusher is the function type used to do the fetch part of a push. The request * is a POST request where the body is JSON with the type [[PushRequest]]. */export type Pusher = (request: Request) => Promise<HTTPRequestInfo>;
export const defaultPusher: Pusher = async request => {  return (await httpRequest(request)).httpRequestInfo;};
/** * This error is thrown when the pusher fails for any reason. */export class PushError extends Error {  name = 'PushError';  // causedBy is used instead of cause, because while cause has been proposed as a  // JavaScript language standard for this purpose (see  // https://github.com/tc39/proposal-error-cause) current browser behavior is  // inconsistent.  causedBy?: Error;  constructor(causedBy?: Error) {    super('Failed to push');    this.causedBy = causedBy;  }}