import { PlatformHeader, ContextReader } from '@webpieces/http-api';
/**
 * StaticContextReader - Returns static header values from a Map.
 *
 * Useful for:
 * - Browser environments where headers are manually managed
 * - Testing with fixed header values
 * - Angular services that read from localStorage/sessionStorage
 *
 * Example:
 * ```typescript
 * const headers = new Map<string, string>();
 * headers.set('x-api-version', 'v1');
 * headers.set('Authorization', getAuthToken());
 * const reader = new StaticContextReader(headers);
 * ```
 */
export declare class StaticContextReader implements ContextReader {
    private headers;
    constructor(headers: Map<string, string>);
    read(header: PlatformHeader): string | undefined;
}
/**
 * CompositeContextReader - Tries multiple readers in order.
 *
 * Later readers override earlier ones (last one wins).
 * Useful for layered header sources:
 * 1. RequestContext (base layer, from incoming request)
 * 2. Config headers (middle layer, from ClientConfig)
 * 3. Dynamic headers (top layer, runtime-computed values)
 *
 * Example:
 * ```typescript
 * const reader = new CompositeContextReader([
 *     new RequestContextReader(),      // Try context first
 *     new StaticContextReader(config), // Fall back to config
 * ]);
 * ```
 */
export declare class CompositeContextReader implements ContextReader {
    private readers;
    constructor(readers: ContextReader[]);
    read(header: PlatformHeader): string | undefined;
}