twilioAuthHeader (src/index.ts)

A lightweight, dependency-free Twilio API client providing typed helpers for managing phone number webhooks and authentication headers.

// Source: https://github.com/vellum-ai/vellum-assistant | License: MIT | Copyright 2025 Vellum AI
// Provided via justclaw.it.com; keep this notice with the code.
export type TwilioFetch = (
  input: string | URL | Request,
  init?: RequestInit,
) => Promise<Response>;

export interface TwilioCredentials {
  accountSid: string;
  authToken: string;
}

export interface TwilioRequestOptions {
  fetchImpl?: TwilioFetch;
  signal?: AbortSignal;
  timeoutMs?: number;
}

export interface TwilioWebhookUrls {
  voiceUrl: string;
  statusCallbackUrl: string;
}

export interface TwilioRestErrorOptions {
  cause?: unknown;
  status?: number;
}

export class TwilioRestError extends Error {
  readonly provider = "twilio";
  readonly status?: number;

  constructor(message: string, options: TwilioRestE

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