import type { Context, OpenTelemetryAPI, Span, TextMapPropagator } from "./types.js";
type SpanFinalizer = {
    bivarianceHack(span: Span | null, error?: unknown): void;
}["bivarianceHack"];
export declare class ContextPropagation {
    private api;
    private propagator;
    constructor(api: OpenTelemetryAPI, propagator: TextMapPropagator);
    extractContext(headers: Headers): Context | undefined;
    injectContext(context: Context, headers: Headers): void;
    getActiveContext(): Context | undefined;
    withActiveSpan<T>(span: Span | null, fn: () => Promise<T>): Promise<T>;
    withSpan<T>(name: string, fn: (span: Span | null) => T, startSpan: (name: string) => Span | null, endSpan: SpanFinalizer): T;
    withSpanAsync<T>(name: string, fn: (span: Span | null) => Promise<T>, startSpan: (name: string) => Span | null, endSpan: SpanFinalizer): Promise<T>;
    private resolveSpanContext;
    private startSpanSafely;
    private endSpanSafely;
    private debug;
}
export {};
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