/**
 * @module
 * Main sently entrypoint — shared types, mailer factories, runtime detection, and OAuth2.
 *
 * Import provider transports and webhook parsers from their subpaths
 * (e.g. `sently/transports/resend`, `sently/transports/sndr`, `sently/webhooks/sndr`)
 * for the smallest bundle. The main barrel only re-exports core APIs plus
 * routing helpers (`FallbackTransport`, `WeightedFallbackTransport`) and
 * `CloudflareEmailTransport`.
 *
 * @example
 * ```ts
 * import { createMailer } from "sently/mailer";
 * import { ResendTransport } from "sently/transports/resend";
 *
 * const mailer = await createMailer({
 *   transport: new ResendTransport({ apiKey: process.env.RESEND_API_KEY! }),
 * });
 *
 * await mailer.send({
 *   from: "you@example.com",
 *   to: "recipient@example.com",
 *   subject: "Hello",
 *   text: "Plain text body",
 * });
 * ```
 */
export { 
/** Default Google OAuth2 token endpoint. */
GOOGLE_TOKEN_URL, 
/** Microsoft OAuth2 token endpoint (common tenant). */
MICROSOFT_TOKEN_URL, 
/** OAuth2 client with in-memory token cache and automatic refresh. */
OAuth2Client, } from "./auth/oauth2.js";
export type { AnySendResult, ChannelSendResult } from "./channel-result.js";
export { 
/** Normalize any channel send result to `{ messageId, provider, accepted }`. */
toChannelSendResult, } from "./channel-result.js";
export type { SentlyErrorCode, SentlyErrorOptions } from "./core/errors.js";
export { 
/** Map an HTTP status code to a stable sently error code. */
httpStatusToSentlyCode, 
/** Base error class for all sently transport and protocol failures. */
SentlyError, 
/** Map an SMTP response code to a stable sently error code. */
smtpCodeToSentlyCode, } from "./core/errors.js";
export type { Address, AddressInput, Attachment, BrevoConfig, BulkSendOptions, BulkSendResult, DKIMConfig, Envelope, Mailer, MailerHookContext, MailerHooks, MailgunConfig, MailOptions, MailPlugin, OAuth2Config, PoolConfig, PreviewConfig, RetryConfig, Runtime, SESConfig, SendResult, SMTPAuth, SMTPConfig, SMTPMailerOptions, SocketAdapter, TLSOptions, Transport, TransportMailerOptions, VerifyResult, } from "./core/types.js";
export { 
/** Detect the current JavaScript runtime. */
detectRuntime, } from "./detect.js";
export { 
/** Create a mailer for custom transports (HTTP APIs, preview, retry). Prefer `sently/mailer` for smallest bundles. */
createMailer, } from "./mailer.js";
export { 
/** Ready-made console logging hooks for mailer lifecycle events. */
consoleObserver, } from "./observability/console.js";
export { 
/** Create a mailer from SMTP host/port config (pooling, adapters). Prefer `sently/smtp` for smallest SMTP bundles. */
createSMTPMailer, } from "./smtp-mailer.js";
export type { CloudflareEmailConfig, CloudflareEmailMessage, CloudflareSendEmailFn, } from "./transports/cloudflare-email.js";
export { 
/** Error thrown when the Cloudflare Email binding rejects a send. */
CloudflareEmailError, 
/** Cloudflare Workers `send_email` binding transport. */
CloudflareEmailTransport, } from "./transports/cloudflare-email.js";
export type { FallbackAttempt, FallbackOptions, FallbackProviderVerifyResult, FallbackVerifyAllResult, } from "./transports/fallback.js";
export { 
/** Thrown when every transport in a fallback chain fails. */
FallbackError, 
/** Provider failover decorator — routes through an ordered list of transports. */
FallbackTransport, } from "./transports/fallback.js";
export type { WeightedTransportEntry } from "./transports/weighted-fallback.js";
export { 
/** Weighted provider routing with failover on error. */
WeightedFallbackTransport, } from "./transports/weighted-fallback.js";