/**
 * Memory Pressure Management
 *
 * Progressive throttling to prevent OOM conditions:
 * - WARNING: Reduce cache TTL to slow memory growth
 * - HIGH: Aggressive eviction to reclaim memory
 * - CRITICAL: Reject requests to prevent OOM
 *
 * Thresholds are configurable via environment variables:
 * - MEMORY_WARNING_THRESHOLD (default: 65)
 * - MEMORY_HIGH_THRESHOLD (default: 75)
 * - MEMORY_CRITICAL_THRESHOLD (default: 80)
 *
 * @module server/shared/renderer/memory/pressure
 */
type MemoryPressureLevel = "normal" | "warning" | "high" | "critical";
/** Parses a percentage threshold from the environment, falling back on missing or invalid values. */
export declare function parseEnvThreshold(name: string, fallback: number, read?: (name: string) => string | undefined): number;
/**
 * Thresholds resolved from the environment at module load. Exported so tests can
 * assert boundaries against the values this process actually uses rather than
 * hard-coding the defaults, which a configured MEMORY_* variable would invalidate.
 * @internal
 */
export declare const THRESHOLDS: {
    WARNING: number;
    HIGH: number;
    CRITICAL: number;
};
/** Classifies a heap usage percentage against the configured thresholds. */
export declare function classifyMemoryPressure(heapUsedPercent: number, thresholds?: typeof THRESHOLDS): MemoryPressureLevel;
type PressureDeps = {
    getHeapStats: () => {
        heapUsedPercent: number;
    };
    thresholds?: typeof THRESHOLDS;
};
/** Test-only seam for substituting heap statistics. */
export declare function __injectDepsForTests(deps: PressureDeps | null): void;
export declare function shouldRejectDueToMemory(): boolean;
/**
 * Get current memory pressure level for use by the worker pool
 * to decide whether to evict idle workers.
 */
export declare function getMemoryPressureLevel(): MemoryPressureLevel;
export {};
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