Errors

{
  "error": {
    "type": "invalid_request",
    "message": "The request body is not valid",
    "fields": [
      { "path": "to", "message": "must not contain line breaks" }
    ]
  }
}

import { Posthaste, isPosthasteError } from '@posthaste/sdk'

const posthaste = new Posthaste({ apiKey: process.env.POSTHASTE_KEY })

async function send(body) {
  try {
    // Resolves for BOTH successes: 202 queued and 200 duplicate.
    // result.duplicate tells you which one it was.
    return await posthaste.emails.send(body)
  } catch (err) {
    if (!isPosthasteError(err)) throw err

    switch (err.type) {
      // Fix the request. Retrying changes nothing.
      case 'invalid_request':
      case 'invalid_address':
      case 'domain_not_found':
      case 'domain_not_verified':
      case 'suppressed':
      case 'attachments_too_many':
      case 'attachments_too_large':
      case 'attachment_type_blocked':
      case 'attachment_invalid':
      case 'content_blocked':
      case 'schedule_too_far':
      case 'not_scheduled':
      case 'forbidden':
        throw new PermanentError(err.type, err.message, err.fields ?? [])

      // Transient throttling, measured in seconds. platform_paused belongs
      // HERE, not below: it says the platform's own daily total is full, not
      // that this account has spent anything. err.isRateLimited covers both.
      case 'rate_limited':
      case 'platform_paused':
        throw new RetryAfter(err.retryAfterSeconds ?? 60)

      // Exhausted quota — hours or days, not seconds. Do not sit on it.
      case 'daily_limit_reached':
      case 'monthly_limit_reached':
        throw new QuotaExhausted(err.retryAfterSeconds)

      // Includes 'unknown_error' (an unhandled 500, which does NOT use the
      // envelope), 'connection_error' and 'timeout' — both status 0.
      default:
        throw new TransientError(err.status, err.message)
    }
  }
}