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    moon-resend

    A typed MoonBit SDK for Resend with a moonfetch HTTP adapter

    resend
    email
    sdk
    saas
    moonbit
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    Version
    0.1.0
    License
    Apache-2.0
    Repository
    Last updated
    1 hour ago
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    #moon-resend

    面向 Resend 邮件平台的类型化 MoonBit SDK，提供 transport-neutral 核心和基于 moonfetch 的真实 HTTPS adapter，适用于 MoonBit Web 应用、SaaS 服务、后台任务和自动化工具。

    CI

    The first milestone intentionally focuses on a reliable transactional-email loop:

    • build and validate send-email requests;
    • HTML and text bodies, CC/BCC/reply-to, attachments, tags and scheduling;
    • idempotency keys;
    • retrieve, reschedule and cancel request builders;
    • typed parsing of retrieved email metadata and delivery state;
    • batch sending for up to 100 messages;
    • typed success and API error parsing;
    • an optional real HTTPS adapter powered by moonfetch.

    #Quick start

    ///|
    let client = @resend.Client::new("re_xxxxxxxxx").unwrap()

    ///|
    let email = @resend.SendEmailParams::new(
      "Acme <onboarding@example.com>",
      ["user@example.com"],
      "Welcome",
      html="<strong>It works!</strong>",
      text="It works!",
    )

    ///|
    let request = client
      .send_request(email, idempotency_key="welcome-user-42")
      .unwrap()

    HttpRequest is deliberately transport-neutral. This keeps request construction and error behavior deterministic while the optional adapter provides real network I/O.

    #Send over HTTPS

    The hua1104/moon-resend/adapter package provides the supported moonfetch integration:

    ///|
    async fn send_welcome(api_key : String) -> Unit {
      let client = @resend.Client::new(api_key).unwrap()
      let email = @resend.SendEmailParams::new(
        "Acme <onboarding@example.com>",
        ["user@example.com"],
        "Welcome",
        html="<strong>It works!</strong>",
        text="It works!",
      )
      match @adapter.send(client, email, idempotency_key="welcome-user-42") {
        Ok(sent) => println("sent: " + sent.id())
        Err(_) => println("send failed")
      }
    }

    The adapter also exposes send_batch, retrieve, update, cancel, and low-level execute. It disables redirects to protect the authorization header and converts network, TLS and timeout failures to ResendError::Transport.

    #Run the live example

    Use a Resend API key, a sender on your verified domain, and a recipient you control. The values stay in environment variables and are never committed:

    $env:RESEND_API_KEY = "re_..."
$env:RESEND_FROM = "Demo <demo@your-verified-domain.example>"
$env:RESEND_TO = "you@example.com"
moon run cmd/send-live --target native

    The regular test suite never sends an email and requires no secret.

    #Deliberate scope

    This is not advertised as a complete Resend API implementation. The November milestone prioritizes send, batch send, retrieve, reschedule, cancel, validation, errors, tests and one reproducible example. Webhook verification, domains, contacts and broadcasts remain roadmap items until the core loop is stable.

    See MILESTONES.md for the delivery plan, architecture for the package boundary, and competition showcase for the coverage matrix and demo script.

    #Competition roadmap

    • November: stabilize the typed request/response core and publish an auditable MVP.
    • December: harden the moonfetch adapter, add mock-server integration tests, and implement webhook signature verification.
    • January: add domains/contacts APIs, examples, API reference docs and Mooncakes packaging.

    The milestones are deliberately usable on their own. Later competition entries extend the SDK with new capabilities instead of submitting the same work split across repositories.

    #Development

    moon check
moon test
moon info
moon fmt

    The live adapter example also compiles in CI on the native target. On Windows, native builds require MSVC Build Tools with the C++ workload and Windows SDK; the default wasm checks do not.

    #License

    Apache-2.0

    ApiError

    source
    pub struct ApiError {
      status : Int
      name : String
      message : String
      raw_body : String
    }

    ApiError::message

    source
    fn ApiError::message(self : ApiError) -> String

    ApiError::name

    source
    fn ApiError::name(self : ApiError) -> String

    ApiError::raw_body

    source
    fn ApiError::raw_body(self : ApiError) -> String

    ApiError::status

    source
    fn ApiError::status(self : ApiError) -> Int

    Attachment

    source
    pub struct Attachment {
      content : String
      filename : String
      content_type : String?
      content_id : String?
    }

    A file attachment. The content must be Base64 encoded as required by Resend.

    Attachment::new

    source
    fn Attachment::new(content : String, filename : String, content_type? : String, content_id? : String) -> Attachment

    BatchEmailIds

    source
    pub struct BatchEmailIds {
      data : Array[EmailId]
    }

    IDs returned by Resend POST /emails/batch.

    BatchEmailIds::data

    source

    Client

    source
    pub struct Client {
      api_key : String
      base_url : String
    }

    Client::batch_send_request

    source
    fn Client::batch_send_request(self : Client, emails : Array[SendEmailParams], idempotency_key? : String) -> Result[HttpRequest, ResendError]

    Build a POST /emails/batch request. Resend currently accepts up to 100 items.

    Client::cancel_request

    source
    fn Client::cancel_request(self : Client, id : String) -> Result[HttpRequest, ResendError]

    Client::new

    source
    fn Client::new(api_key : String, base_url? : String) -> Result[Client, ResendError]

    Client::parse_batch_response

    source
    fn Client::parse_batch_response(_self : Client, response : HttpResponse) -> Result[BatchEmailIds, ResendError]

    Client::parse_id_response

    source
    fn Client::parse_id_response(_self : Client, response : HttpResponse) -> Result[EmailId, ResendError]

    Parse the shared response used by send and cancel.

    Client::parse_retrieve_response

    source
    fn Client::parse_retrieve_response(_self : Client, response : HttpResponse) -> Result[RetrievedEmail, ResendError]

    Client::retrieve_request

    source
    fn Client::retrieve_request(self : Client, id : String) -> Result[HttpRequest, ResendError]

    Client::send_request

    source
    fn Client::send_request(self : Client, params : SendEmailParams, idempotency_key? : String) -> Result[HttpRequest, ResendError]

    Client::update_request

    source
    fn Client::update_request(self : Client, id : String, params : UpdateEmailParams) -> Result[HttpRequest, ResendError]

    Reschedule an email that has not been sent yet.

    EmailId

    source
    pub struct EmailId {
      id : String
    }

    EmailId::id

    source
    fn EmailId::id(self : EmailId) -> String

    HttpRequest

    source
    pub struct HttpRequest {
      verb : String
      url : String
      headers : Array[(String, String)]
      body : String?
    }

    A transport-neutral HTTP request. Adapters can map this value to any MoonBit HTTP client without coupling the SDK core to one runtime.

    HttpRequest::body

    source
    fn HttpRequest::body(self : HttpRequest) -> String?

    HttpRequest::headers

    source
    fn HttpRequest::headers(self : HttpRequest) -> Array[(String, String)]

    HttpRequest::new

    source
    fn HttpRequest::new(verb : String, url : String, headers? : Array[(String, String)], body? : String) -> HttpRequest

    Construct a custom request for adapters and tests. Most applications should use the request builders on Client.

    HttpRequest::url

    source
    fn HttpRequest::url(self : HttpRequest) -> String

    HttpRequest::verb

    source
    fn HttpRequest::verb(self : HttpRequest) -> String

    HttpResponse

    source
    pub struct HttpResponse {
      status : Int
      headers : Array[(String, String)]
      body : String
    }

    A transport-neutral HTTP response returned by an adapter or test fake.

    HttpResponse::body

    source
    fn HttpResponse::body(self : HttpResponse) -> String

    HttpResponse::headers

    source
    fn HttpResponse::headers(self : HttpResponse) -> Array[(String, String)]

    HttpResponse::new

    source
    fn HttpResponse::new(status : Int, body : String, headers? : Array[(String, String)]) -> HttpResponse

    HttpResponse::status

    source
    fn HttpResponse::status(self : HttpResponse) -> Int

    ResendError

    source
    pub enum ResendError {
      InvalidInput(String)
      Api(ApiError)
      InvalidResponse(String)
      Transport(String)
    }

    ResendError::invalid_input

    source
    fn ResendError::invalid_input(message : String) -> ResendError

    Create an input error from an adapter or extension package.

    ResendError::message

    source
    fn ResendError::message(self : ResendError) -> String

    A concise description suitable for application logs.

    ResendError::transport

    source
    fn ResendError::transport(message : String) -> ResendError

    Create a network, TLS or timeout error from a transport adapter.

    RetrievedEmail

    source
    pub struct RetrievedEmail {
      id : String
      from : String
      to : Array[String]
      subject : String
      created_at : String
      html : String?
      text : String?
      cc : Array[String]
      bcc : Array[String]
      reply_to : Array[String]
      last_event : String?
      scheduled_at : String?
    }

    The stable subset returned by Resend GET /emails/:id. Optional fields stay optional because Resend omits content fields in some delivery states.

    RetrievedEmail::bcc

    source
    fn RetrievedEmail::bcc(self : RetrievedEmail) -> Array[String]

    RetrievedEmail::cc

    source
    fn RetrievedEmail::cc(self : RetrievedEmail) -> Array[String]

    RetrievedEmail::created_at

    source
    fn RetrievedEmail::created_at(self : RetrievedEmail) -> String

    RetrievedEmail::html

    source
    fn RetrievedEmail::html(self : RetrievedEmail) -> String?

    RetrievedEmail::id

    source
    fn RetrievedEmail::id(self : RetrievedEmail) -> String

    RetrievedEmail::last_event

    source
    fn RetrievedEmail::last_event(self : RetrievedEmail) -> String?

    RetrievedEmail::recipients

    source
    fn RetrievedEmail::recipients(self : RetrievedEmail) -> Array[String]

    RetrievedEmail::reply_to

    source
    fn RetrievedEmail::reply_to(self : RetrievedEmail) -> Array[String]

    RetrievedEmail::scheduled_at

    source
    fn RetrievedEmail::scheduled_at(self : RetrievedEmail) -> String?

    RetrievedEmail::sender

    source
    fn RetrievedEmail::sender(self : RetrievedEmail) -> String

    RetrievedEmail::subject

    source
    fn RetrievedEmail::subject(self : RetrievedEmail) -> String

    RetrievedEmail::text

    source
    fn RetrievedEmail::text(self : RetrievedEmail) -> String?

    SendEmailParams

    source
    pub struct SendEmailParams {
      from : String
      to : Array[String]
      subject : String
      html : String?
      text : String?
      cc : Array[String]
      bcc : Array[String]
      reply_to : Array[String]
      attachments : Array[Attachment]
      tags : Array[(String, String)]
      scheduled_at : String?
    }

    Parameters accepted by Resend POST /emails.

    SendEmailParams::json_string

    source
    fn SendEmailParams::json_string(self : SendEmailParams) -> String

    SendEmailParams::new

    source
    fn SendEmailParams::new(from : String, to : Array[String], subject : String, html? : String, text? : String, cc? : Array[String], bcc? : Array[String], reply_to? : Array[String], attachments? : Array[Attachment], tags? : Array[(String, String)], scheduled_at? : String) -> SendEmailParams

    SendEmailParams::to_json

    source

    UpdateEmailParams

    source
    pub struct UpdateEmailParams {
      scheduled_at : String
    }

    Parameters accepted by Resend PATCH /emails/:id.

    UpdateEmailParams::new

    source
    fn UpdateEmailParams::new(scheduled_at : String) -> UpdateEmailParams

    Source Files