SendGridHttpClient (src/http-client.ts)

A TypeScript HTTP client for SendGrid API with retry and error handling.

// Source: https://github.com/dahlia/upyo | License: MIT | Copyright 2025 Hong Minhee
// Provided via justclaw.it.com; keep this notice with the code.
import { combineSignals, parseRetryAfter } from "@upyo/core";
import type { ResolvedSendGridConfig } from "./config.ts";

/**
 * Response from SendGrid API for sending messages.
 */
export interface SendGridResponse {
  /**
   * HTTP status code returned by SendGrid.
   */
  readonly statusCode?: number;

  /**
   * Response body from SendGrid (usually empty on success).
   */
  readonly body?: string;

  /**
   * Response headers from SendGrid.
   */
  readonly headers?: Record<string, string>;
}

/**
 * Error response from SendGrid API.
 */
export interface SendGridError {
  /**
   * Error message from SendGrid.
   */
  readonly message: s

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