export type Environment = {
    readonly [key: string]: string;
};
export type Logger = {
    enrich(fields: object): Logger;
    trace(message: string, error?: unknown, fields?: object): void;
    debug(message: string, error?: unknown, fields?: object): void;
    info(message: string, error?: unknown, fields?: object): void;
    warn(message: string, error?: unknown, fields?: object): void;
    error(message: string, error?: unknown, fields?: object): void;
    fatal(message: string, error?: unknown, fields?: object): void;
};
export type MutableJson = null | boolean | number | string | MutableJson[] | {
    [key: string]: MutableJson;
};
export type Json = null | boolean | number | string | readonly Json[] | {
    readonly [key: string]: Json;
};
export declare function objectSpreadable(json?: Json): {
    readonly [key: string]: Json;
};
export declare function arraySpreadable(json?: Json): readonly Json[];
export type HandlerConfiguration = {
    /**
     * An indication of CPU usage of the handler.
     * @default 'low'
     */
    readonly compute?: 'high' | 'low';
    /**
     * An indication of memory usage of the handler.
     * @default 'low'
     */
    readonly memory?: 'high' | 'low';
    /**
     * A boolean indicating whether to enrich the log with the body of events, requests or responses. Set to false if the body is large or contain very sensitive data.
     * @default false
     */
    readonly excludeBodyFromLogs?: boolean;
    /**
     * The level below which log entries will be discarded.
     * @default 'trace'
     */
    readonly minimumLogLevel?: 'trace' | 'debug' | 'info' | 'warning' | 'error' | 'fatal';
    /**
     * The number of seconds the function is expected to finish executing in.
     */
    readonly timeout?: number;
};
export type Context = {
    readonly env: Environment;
    readonly log: Logger;
    readonly signal: AbortSignal;
    now(): Date;
    readonly operationId?: string;
    readonly client?: {
        readonly id?: string;
        readonly ip?: string;
        readonly port?: number;
        readonly userAgent?: string;
    };
    readonly meta?: {
        readonly packageName: string;
        readonly fileName: string;
        readonly revision?: string;
    };
    emit(topic: string, type: string, subject: string, data?: Json, messageId?: string): void;
    eventBarrier(): Promise<void>;
    onSuccess(fn: () => Promise<void> | void): void;
};
export declare function httpRequestHeaders(context: Context): {
    [key: string]: string;
};
export declare function measure<T>(logger: {
    trace: (message: string, _: undefined, f: object) => void;
}, name: string, fn: () => Promise<T> | T, fields?: object): Promise<T>;