sdk-dx

# Every call requires full configuration
message = Message(
    body="Hello world",
    to=PhoneNumber("+1234567890"),
    from_=PhoneNumber(config.get_default_from()),
    options=MessageOptions(
        status_callback=None,
        media_urls=[]
    )
)
client.messages.send(message)

// Level 1: Simplest possible usage
const result = await client.analyze("Hello world");
 
// Level 2: Common options
const result = await client.analyze("Hello world", {
  language: "en",
  features: ["sentiment", "entities"]
});
 
// Level 3: Full control
const result = await client.analyze("Hello world", {
  language: "en",
  features: ["sentiment", "entities"],
  model: "v2-large",
  timeout: 30000,
  retries: { max: 3, backoff: "exponential" }
});

# Validation at construction time
client = MyClient(api_key="")
# Raises immediately: ValueError: API key cannot be empty.
# Get your API key at https://dashboard.example.com/keys
 
# Clear error at runtime
client.users.get("invalid-id")
# Raises: NotFoundError: User 'invalid-id' not found.
# Use client.users.list() to see available users.

client = MyClient(api_key="")  # No validation
result = client.users.get("invalid-id")
# Returns: None (is this an error? empty result? who knows?)
# Or worse: raises generic Exception with stack trace

// This should just work without configuration
const client = new MyClient({ apiKey: process.env.MY_API_KEY });
 
// Sensible defaults:
// - Automatic retries with exponential backoff
// - Reasonable timeouts
// - JSON content type
// - Standard auth headers
// - Connection pooling

AuthenticationError: Invalid API key provided.

The API key 'sk_test_abc...' (test key) cannot be used for
production requests.

To fix this:
1. Go to https://dashboard.example.com/keys
2. Copy your production API key (starts with 'sk_live_')
3. Update your environment variable: MY_API_KEY=sk_live_...

Docs: https://docs.example.com/authentication

Error: 401 Unauthorized

from myapi.errors import (
    AuthenticationError,  # Invalid/missing credentials
    AuthorizationError,   # Valid creds, insufficient permissions
    ValidationError,      # Invalid input data
    NotFoundError,        # Resource doesn't exist
    RateLimitError,       # Too many requests
    ServerError,          # Our fault, retry might help
)
 
try:
    client.users.get(user_id)
except NotFoundError as e:
    # Handle missing user specifically
except AuthenticationError as e:
    # Handle auth issues specifically
except MyAPIError as e:
    # Catch-all for other API errors

// Bad: generic error
throw new Error("Invalid parameter");
 
// Good: contextual error
throw new ValidationError({
  message: "Invalid phone number format",
  field: "to",
  value: "+1abc",
  expected: "E.164 format (e.g., +14155551234)",
  docs: "https://docs.example.com/phone-numbers"
});

// Define explicit types for all inputs and outputs
interface User {
  id: string;
  email: string;
  name: string;
  createdAt: Date;
  metadata?: Record<string, unknown>;
}
 
interface CreateUserInput {
  email: string;
  name: string;
  metadata?: Record<string, unknown>;
}
 
// Return types are explicit
async function createUser(input: CreateUserInput): Promise<User> {
  // ...
}
 
// Use discriminated unions for responses
type ApiResponse<T> =
  | { success: true; data: T }
  | { success: false; error: ApiError };

// Good: autocomplete shows all options
client.messages.create({
  to: "+1...",     // IDE shows: (property) to: string
  body: "...",    // IDE shows: (property) body: string
  // User types 'me' and sees 'mediaUrls' autocomplete
});
 
// Bad: requires memorization
client.send("messages", { /* what goes here? */ });

// Good: constrained values with autocomplete
type MessageStatus = "queued" | "sending" | "sent" | "failed";
 
interface Message {
  status: MessageStatus;  // IDE shows valid values
}
 
// Bad: any string accepted
interface Message {
  status: string;  // No guidance, errors at runtime
}

// Namespace methods logically
client.users.get(id)
client.users.list()
client.users.create(data)
client.users.update(id, data)
client.users.delete(id)
 
// After typing 'client.users.' the IDE shows all user operations

/**
 * Creates a new user in your organization.
 *
 * @param input - The user details
 * @param input.email - Must be a valid email address
 * @param input.name - Display name (max 100 characters)
 * @returns The created user with generated ID
 * @throws {ValidationError} If email format is invalid
 * @throws {ConflictError} If email already exists
 *
 * @example
 * const user = await client.users.create({
 *   email: "jane@example.com",
 *   name: "Jane Developer"
 * });
 */
async createUser(input: CreateUserInput): Promise<User>

def send_message(self, body: str, to: str, **kwargs) -> Message:
    """
    Send an SMS message.
 
    Args:
        body: The message content (max 1600 characters)
        to: Recipient phone number in E.164 format
 
    Returns:
        Message object with ID and status
 
    Example:
        >>> message = client.messages.send(
        ...     body="Hello from Python!",
        ...     to="+14155551234"
        ... )
        >>> print(message.status)
        'queued'
    """

import warnings
 
def old_method(self):
    """
    .. deprecated:: 2.3.0
       Use :meth:`new_method` instead. Will be removed in 3.0.0.
    """
    warnings.warn(
        "old_method() is deprecated, use new_method() instead. "
        "See migration guide: https://docs.example.com/migrate-v3",
        DeprecationWarning,
        stacklevel=2
    )
    return self.new_method()

# Pythonic
with client.batch() as batch:
    for user in client.users.list():
        batch.add(user.send_notification("Hello"))
 
# Not Pythonic
users = client.getUsers()
batch = client.createBatch()
for i in range(len(users)):
    batch.addOperation(users[i].sendNotification("Hello"))
batch.execute()

// Idiomatic JS
const { data, error } = await client.users.get(id);
 
// Not idiomatic
client.users.get(id, function(err, result) {
    if (err) { /* callback hell */ }
});

// Idiomatic Go
user, err := client.Users.Get(ctx, userID)
if err != nil {
    return fmt.Errorf("getting user: %w", err)
}
 
// Not idiomatic
user := client.Users.Get(userID)  // panics on error