Transport.from

import { Challenge } from 'mppx'
import { Transport } from 'mppx/client'
 
const http = Transport.from<RequestInit, Response>({
  getChallenges(response) {
    return Challenge.fromResponseList(response)
  },
  isPaymentRequired(response) {
    return response.status === 402
  },
  name: 'http',
  setCredential(request, credential) {
    const headers = new Headers(request.headers)
    headers.set('Authorization', credential)
    return { ...request, headers }
  },
})

type Transport<request, response> = {
  /** Extracts every Challenge from a payment-required response. */
  getChallenges: (response: response, request?: request) => Challenge[] | Promise<Challenge[]>
  /** Checks if a response indicates payment is required. */
  isPaymentRequired: (response: response, request?: request) => boolean | Promise<boolean>
  /** Transport name for identification. */
  name: string
  /** Attaches a credential to a request. */
  setCredential: (request: request, credential: string, options?: SetCredentialOptions) => request
}