import { Context, Handler } from "aws-lambda";
import { MetricsConfig, MetricsQueue } from "./metrics";
import { TraceConfig } from "./trace";
import { Logger } from "./utils";
import { DatadogTraceHeaders } from "./trace/context/extractor";
export { DatadogTraceHeaders as TraceHeaders } from "./trace/context/extractor";
export declare const apiKeyEnvVar = "DD_API_KEY";
export declare const apiKeyKMSEnvVar = "DD_KMS_API_KEY";
export declare const apiKeySecretARNEnvVar = "DD_API_KEY_SECRET_ARN";
export declare const captureLambdaPayloadEnvVar = "DD_CAPTURE_LAMBDA_PAYLOAD";
export declare const captureLambdaPayloadMaxDepthEnvVar = "DD_CAPTURE_LAMBDA_PAYLOAD_MAX_DEPTH";
export declare const traceManagedServicesEnvVar = "DD_TRACE_MANAGED_SERVICES";
export declare const siteURLEnvVar = "DD_SITE";
export declare const logLevelEnvVar = "DD_LOG_LEVEL";
export declare const logForwardingEnvVar = "DD_FLUSH_TO_LOG";
export declare const logInjectionEnvVar = "DD_LOGS_INJECTION";
export declare const enhancedMetricsEnvVar = "DD_ENHANCED_METRICS";
export declare const datadogHandlerEnvVar = "DD_LAMBDA_HANDLER";
export declare const lambdaTaskRootEnvVar = "LAMBDA_TASK_ROOT";
export declare const mergeXrayTracesEnvVar = "DD_MERGE_XRAY_TRACES";
export declare const traceExtractorEnvVar = "DD_TRACE_EXTRACTOR";
export declare const defaultSiteURL = "datadoghq.com";
export declare const encodeAuthorizerContextEnvVar = "DD_ENCODE_AUTHORIZER_CONTEXT";
export declare const decodeAuthorizerContextEnvVar = "DD_DECODE_AUTHORIZER_CONTEXT";
export declare const coldStartTracingEnvVar = "DD_COLD_START_TRACING";
export declare const minColdStartTraceDurationEnvVar = "DD_MIN_COLD_START_DURATION";
export declare const coldStartTraceSkipLibEnvVar = "DD_COLD_START_TRACE_SKIP_LIB";
export declare const localTestingEnvVar = "DD_LOCAL_TESTING";
export declare const addSpanPointersEnvVar = "DD_TRACE_AWS_ADD_SPAN_POINTERS";
export declare const dataStreamsEnabledEnvVar = "DD_DATA_STREAMS_ENABLED";
interface GlobalConfig {
    /**
     * Whether to log extra information.
     * @default false
     */
    debugLogging: boolean;
    /**
     * Whether to force the `datadog()` wrapper to always wrap.
     * @default false
     */
    forceWrap: boolean;
    /**
     * Custom logger.
     */
    logger?: Logger;
}
/**
 * Configuration options for Datadog's lambda wrapper.
 */
export type Config = MetricsConfig & TraceConfig & GlobalConfig;
export declare const defaultConfig: Config;
export declare const _metricsQueue: MetricsQueue;
/**
 * Wraps your AWS lambda handler functions to add tracing/metrics support
 * @param handler A lambda handler function.
 * @param config Configuration options for datadog.
 * @returns A wrapped handler function.
 *
 * ```javascript
 * import { datadog } from 'datadog-lambda-js';
 * function yourHandler(event) {}
 * exports.yourHandler = datadog(yourHandler);
 * ```
 */
export declare function datadog<TEvent, TResult>(handler: Handler<TEvent, TResult> | any, config?: Partial<Config>): Handler<TEvent, TResult> | any;
/**
 *
 * @param isResponseStreamFunction A boolean determining if a Lambda Function is Response Stream.
 * @param args Spread arguments of a Lambda Function.
 * @returns An object containing the context and the event of a Lambda Function.
 */
export declare function extractArgs<TEvent>(isResponseStreamFunction: boolean, ...args: any[]): {
    context: Context;
    event: TEvent;
    responseStream: any;
};
/**
 * Sends a Distribution metric asynchronously to the Datadog API.
 * @param name The name of the metric to send.
 * @param value The value of the metric
 * @param metricTime The timestamp associated with this metric data point.
 * @param tags The tags associated with the metric. Should be of the format "tag:value".
 */
export declare function sendDistributionMetricWithDate(name: string, value: number, metricTime: Date, ...tags: string[]): void;
/**
 * Sends a Distribution metric asynchronously to the Datadog API.
 * @param name The name of the metric to send.
 * @param value The value of the metric
 * @param tags The tags associated with the metric. Should be of the format "tag:value".
 */
export declare function sendDistributionMetric(name: string, value: number, ...tags: string[]): void;
/**
 * Retrieves the Datadog headers for the current trace.
 */
export declare function getTraceHeaders(): Partial<DatadogTraceHeaders>;
export declare function getEnvValue(key: string, defaultValue: string): string;
export declare function emitTelemetryOnErrorOutsideHandler(error: Error, functionName: string, startTime: number): Promise<void>;
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