autotel/dist/functional.d.ts

Write Once, Observe Anywhere

import { n as TraceContext } from "./trace-context-IuyoPyNq.js";
import { p as Sampler } from "./sampling-CP3e7-Yr.js";
import { Span } from "@opentelemetry/api";
//#region src/functional.d.ts
type WrappedFunction<TArgs extends unknown[], TReturn> = (...args: TArgs) => TReturn | Promise<TReturn>;
/**
 * Common options for functional tracing
 */
interface TracingOptions<TArgs extends unknown[] = unknown[], TReturn = unknown> {
  /**
   * Span name (highest priority)
   * If provided, this is used as the span name
   */
  name?: string;
  /**
   * Service name (used to compose final span name)
   * If name not provided, span name becomes: ${serviceName}.${functionName}
   */
  serviceName?: string;
  /**
   * Sampling strategy
   * @default AlwaysSampler
   */
  sampler?: Sampler;
  /**
   * Enable metrics collection (counter, histogram)
   * @default false
   */
  withMetrics?: boolean;
  /**
   * Extract attributes from function arguments
   */
  attributesFromArgs?: (args: TArgs) => Record<string, unknown>;
  /**
   * Extract attributes from function result
   */
  attributesFromResult?: (result: TReturn) => Record<string, unknown>;
  /**
   * Capture the function arguments onto the span as `autotel.input`
   * (JSON, truncated). One arg is captured directly; multiple are captured as
   * an array. Off by default — opt in per call. Tools (visualizers, devtools)
   * read this alongside `ai.toolCall.args` to show function I/O uniformly.
   * Avoid on args with secrets/PII, or pair with a redacting processor.
   */
  captureInput?: boolean;
  /**
   * Capture the function return value onto the span as `autotel.output`
   * (JSON, truncated). Off by default. Same caveats as {@link captureInput}.
   */
  captureOutput?: boolean;
  /**
   * Start a new root span instead of creating a child
   * Useful for serverless entry points
   * @default false
   */
  startNewRoot?: boolean;
  /**
   * Flush events queue when span ends
   * Only flushes on root spans (to avoid excessive flushing)
   * @default true
   */
  flushOnRootSpanEnd?: boolean;
  /**
   * Span kind for semantic convention compliance
   * Used for messaging (PRODUCER/CONSUMER), HTTP (CLIENT/SERVER), etc.
   * @default SpanKind.INTERNAL
   */
  spanKind?: import('@opentelemetry/api').SpanKind;
  /**
   * Classify a thrown value as a real error. Return `false` to treat the throw
   * as expected control flow: the span is marked OK, no exception is recorded,
   * and the value is rethrown untouched. Use this for framework control-flow
   * signals that propagate via `throw` but are not failures — e.g. TanStack
   * Router / Next.js `redirect()` and `notFound()`.
   * @default every throw is treated as an error
   */
  isError?: (error: unknown) => boolean;
}
/**
 * Options for instrument() batch instrumentation
 */
interface InstrumentOptions<T extends Record<string, AnyInstrumentable> = Record<string, AnyInstrumentable>> extends TracingOptions {
  /** Object whose function properties should be instrumented */
  functions: T;
  /**
   * Per-function configuration overrides
   */
  overrides?: Record<string, Partial<TracingOptions>>;
  /**
   * Functions to skip (won't be instrumented)
   * Supports:
   * - String keys: 'functionName'
   * - RegExp: /^_internal/
   * - Predicate: (key, fn) => boolean
   *
   * By default, functions starting with _ are skipped
   */
  skip?: (string | RegExp | ((key: string, fn: Function) => boolean))[];
}
/**
 * Options for instrumenting one function with an explicit stable key.
 */
interface SingleInstrumentOptions<TFunction extends AnyInstrumentable = AnyInstrumentable> extends TracingOptions {
  /** Stable function key used for span naming */
  key: string;
  /** Function to instrument */
  fn: TFunction;
}
/**
 * Constraint alias for `instrument()` and friends. `never[]` parameters make
 * every concretely-typed function (e.g. `(name: string) => Promise<User>`)
 * satisfy the constraint under `strictFunctionTypes` without resorting to
 * `any`. Use ONLY in constraint positions — the concrete `T` is still
 * inferred from the actual argument, so call-site argument and return types
 * are fully preserved.
 */
type AnyInstrumentable = ((...args: never[]) => unknown) & {
  displayName?: string;
  name?: string;
};
/**
 * Get the autotel {@link TraceContext} for the currently active span.
 *
 * This is the ambient accessor for the functional API: instead of threading a
 * `ctx` parameter through a factory, call this inside any traced function (or a
 * helper it calls) to reach `setAttribute`, `setUser`, `getBaggage`, and the
 * rest of the context surface. Returns `undefined` when no span is active.
 *
 * @example
 * ```typescript
 * const getUser = trace('getUser', async (id: string) => {
 *   getActiveTraceContext()?.setAttribute('user.id', id);
 *   return db.users.find(id);
 * });
 * ```
 *
 * @see getActiveSpan for the raw OpenTelemetry span
 * @see getRequestLogger which reads the active context when called with no args
 */
declare function getActiveTraceContext<TBaggage extends Record<string, unknown> | undefined = undefined>(): TraceContext<TBaggage> | undefined;
/**
 * Context object that lazily evaluates the active span on property access
 *
 * Access trace context directly without function call syntax.
 *
 * @example
 * ```typescript
 * import { trace, ctx } from 'autotel'
 *
 * export const createUser = trace(async (data) => {
 *   // Direct property access - no function call!
 *   if (ctx.traceId) {
 *     ctx.setAttribute('user.id', data.id)
 *     console.log('Trace:', ctx.traceId)
 *   }
 * })
 * ```
 */
declare const ctx: TraceContext;
/**
 * Approach 1: trace() - Zero-ceremony HOF
 *
 * Wrap a plain function with automatic tracing. The function receives its real
 * arguments; no context parameter is injected. Use
 * {@link getActiveTraceContext} inside the function, or use {@link withTracing}
 * for the explicit `(ctx) => (...args) => result` factory form.
 *
 * @example Auto-inferred name - Plain function
 * ```typescript
 * export const createUser = trace(async (data) => {
 *   return await db.users.create(data)
 * })
 * // → Traced as "createUser"
 * ```
 *
 * @example Ambient context access
 * ```typescript
 * export const createUser = trace(async (data) => {
 *   getActiveTraceContext()?.setAttribute('user.id', data.id)
 *   return await db.users.create(data)
 * })
 * ```
 *
 * @example Custom name - Plain function
 * ```typescript
 * export const createUser = trace('user.create', async (data) => {
 *   return await db.users.create(data)
 * })
 * // → Traced as "user.create"
 * ```
 *
 * @example Explicit factory context with withTracing()
 * ```typescript
 * export const createUser = withTracing({ name: 'user.create' })((ctx) => async (data) => {
 *   ctx.setAttribute('user.id', data.id)
 *   return await db.users.create(data)
 * })
 * ```
 *
 * @example Full options - Plain function
 * ```typescript
 * export const createUser = trace({
 *   name: 'user.create',
 *   sampler: new AdaptiveSampler(),
 *   withMetrics: true
 * }, async (data) => {
 *   return await db.users.create(data)
 * })
 * ```
 *
 */
declare function trace<TArgs extends unknown[], TReturn>(fn: (...args: TArgs) => TReturn): (...args: TArgs) => TReturn;
declare function trace<TArgs extends unknown[], TReturn>(name: string, fn: (...args: TArgs) => TReturn): (...args: TArgs) => TReturn;
declare function trace<TArgs extends unknown[], TReturn>(options: TracingOptions<TArgs, TReturn>, fn: (...args: TArgs) => TReturn): (...args: TArgs) => TReturn;
/**
 * Approach 2: withTracing() - Middleware-style composable wrapper
 *
 * Returns a HOF that wraps functions with tracing.
 * Perfect for composition and reusable configuration.
 *
 * @example Standard usage
 * ```typescript
 * export const createUser = withTracing({
 *   name: 'user.create'
 * })(ctx => async (data) => {
 *   ctx.setAttribute('user.id', data.id)
 *   return await db.users.create(data)
 * })
 * ```
 *
 * @example Composable
 * ```typescript
 * const tracer = withTracing({ serviceName: 'user' })
 *
 * export const createUser = tracer(ctx => async (data) => { })
 * export const updateUser = tracer(ctx => async (id, data) => { })
 * ```
 *
 * @example With other middleware
 * ```typescript
 * export const createUser = compose(
 *   withAuth({ role: 'admin' }),
 *   withTracing({ name: 'user.create' }),
 *   withRateLimit({ max: 100 })
 * )(ctx => async (data) => { })
 * ```
 */
declare function withTracing<TCfgArgs extends unknown[] = unknown[], TCfgReturn = unknown>(options?: TracingOptions<TCfgArgs, TCfgReturn>): <TArgs extends TCfgArgs, TReturn extends TCfgReturn>(fnFactory: (ctx: TraceContext) => (...args: TArgs) => TReturn | Promise<TReturn>) => WrappedFunction<TArgs, TReturn>;
/**
 * Approach 3: instrument() - Batch auto-instrumentation
 *
 * Instrument an entire module/object at once.
 * Closest to @Instrumented decorator pattern.
 *
 * @example Basic usage
 * ```typescript
 * export default instrument({
 *   functions: {
 *     createUser: async (data) => { },
 *     updateUser: async (id, data) => { },
 *     deleteUser: async (id) => { }
 *   },
 *   serviceName: 'user',
 *   sampler: new AdaptiveSampler()
 * })
 * // → Traced as "user.createUser", "user.updateUser", "user.deleteUser"
 * ```
 *
 * @example Per-function overrides
 * ```typescript
 * export default instrument({
 *   functions: {
 *     createUser: async (data) => { },
 *     deleteUser: async (id) => { }
 *   },
 *   serviceName: 'user',
 *   overrides: {
 *     deleteUser: {
 *       sampler: new AlwaysSampler(),
 *       withMetrics: true
 *     }
 *   }
 * })
 * ```
 *
 * @example Skip functions
 * ```typescript
 * export default instrument({
 *   functions: {
 *     createUser: async (data) => { },
 *     _internal: async () => { }, // Auto-skipped (_-prefix)
 *     deleteUser: async (id) => { }
 *   },
 *   serviceName: 'user',
 *   skip: [/^test/, (key) => key.includes('debug')]
 * })
 * ```
 */
declare function instrument<TFunction extends AnyInstrumentable>(options: SingleInstrumentOptions<TFunction>): TFunction;
declare function instrument<T extends Record<string, AnyInstrumentable>>(options: InstrumentOptions<T>): T;
/**
 * Options for span() function
 */
interface SpanOptions {
  /** Span name */
  name: string;
  /** Attributes to set on the span */
  attributes?: Record<string, string | number | boolean>;
  /** OpenTelemetry span kind */
  spanKind?: import('@opentelemetry/api').SpanKind;
}
/**
 * Execute a function within a named span
 *
 * Useful for adding tracing to specific code blocks without wrapping
 * the entire function. Supports both synchronous and asynchronous functions.
 *
 * Mirrors `trace()`: pass a span name as the first argument for the common
 * case, or full `SpanOptions` when you need to attach attributes.
 *
 * @example
 * ```typescript
 * // Name shorthand
 * await span('payment.charge', async (span) => {
 *   await chargeCustomer(order);
 * })
 *
 * // Full options when attributes are needed
 * await span(
 *   { name: 'payment.charge', attributes: { amount: order.total } },
 *   async (span) => {
 *     await chargeCustomer(order);
 *   },
 * )
 *
 * // Sync
 * const total = span('calculateTotal', (span) => {
 *   return items.reduce((sum, item) => sum + item.price, 0);
 * })
 * ```
 */
declare function span<T = unknown>(name: string, fn: (span: Span) => T): T;
declare function span<T = unknown>(name: string, fn: (span: Span) => Promise<T>): Promise<T>;
declare function span<T = unknown>(options: SpanOptions, fn: (span: Span) => T): T;
declare function span<T = unknown>(options: SpanOptions, fn: (span: Span) => Promise<T>): Promise<T>;
/**
 * Options for withNewContext() function
 */
interface WithNewContextOptions<T = unknown> {
  /** Function to execute in new root context */
  fn: () => Promise<T>;
}
/**
 * Execute a function in a new root context (prevents span propagation)
 *
 * Useful when you want to start a completely new trace without
 * parent-child relationships.
 *
 * @example
 * ```typescript
 * async function handleWebhook(payload: WebhookPayload) {
 *   // This creates a new root trace, not connected to the HTTP request trace
 *   await withNewContext({
 *     fn: async () => {
 *       await span('webhook.process', async () => {
 *         await processWebhookPayload(payload)
 *       })
 *     }
 *   })
 * }
 * ```
 */
declare function withNewContext<T = unknown>(options: WithNewContextOptions<T>): Promise<T>;
/**
 * Options for withBaggage() function
 */
interface WithBaggageOptions<T = unknown> {
  /** Baggage entries to set (key-value pairs) */
  baggage: Record<string, string>;
  /** Function to execute with the updated baggage */
  fn: () => T | Promise<T>;
}
/**
 * Execute a function with updated baggage entries
 *
 * Baggage is immutable in OpenTelemetry, so this helper creates a new context
 * with the specified baggage entries and runs the function within that context.
 * All child spans created within the function will inherit the baggage.
 *
 * @example Setting baggage for downstream services
 * ```typescript
 * import { withTracing, withBaggage } from 'autotel';
 *
 * export const createOrder = withTracing({ name: 'order.create' })((ctx) => async (order: Order) => {
 *   // Set baggage that will be propagated to downstream HTTP calls
 *   return await withBaggage({
 *     baggage: {
 *       'tenant.id': order.tenantId,
 *       'user.id': order.userId,
 *     },
 *     fn: async () => {
 *       // This HTTP call will include the baggage in headers
 *       await fetch('/api/charge', {
 *         method: 'POST',
 *         body: JSON.stringify(order),
 *       });
 *     },
 *   });
 * });
 * ```
 *
 * @example Using with existing baggage
 * ```typescript
 * export const processOrder = withTracing({ name: 'order.process' })((ctx) => async (order: Order) => {
 *   // Read existing baggage
 *   const tenantId = ctx.getBaggage('tenant.id');
 *
 *   // Add additional baggage entries
 *   return await withBaggage({
 *     baggage: {
 *       'order.id': order.id,
 *       'order.amount': String(order.amount),
 *     },
 *     fn: async () => {
 *       await charge(order);
 *     },
 *   });
 * });
 * ```
 */
declare function withBaggage<T = unknown>(options: WithBaggageOptions<T>): T | Promise<T>;
//#endregion
export { InstrumentOptions, SingleInstrumentOptions, SpanOptions, type TraceContext, TracingOptions, WithBaggageOptions, WithNewContextOptions, ctx, getActiveTraceContext, instrument, span, trace, withBaggage, withNewContext, withTracing };
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