/**
 * Interactive zero-dependency Web Audio Synthesizer for Retro Game Sound Effects.
 * Generates audio waveforms on the fly without downloading external files!
 */
export declare class SoundEffects {
    private static ctx;
    private static ambientOsc;
    private static ambientLfo;
    private static ambientGain;
    private static filterNode;
    private static getContext;
    /**
     * Plays a coin/target pick up sound.
     * High-pitch modern retro bounce chime.
     */
    static playCollect(): void;
    /**
     * Plays a jump sound.
     * Sweeps pitch from lower to higher.
     */
    static playJump(): void;
    /**
     * Plays a collision or bounce impact bumper sound.
     * Low thud frequency.
     */
    static playCollision(): void;
    /**
     * Plays a power-up or high-score sound cascade.
     */
    static playLevelUp(): void;
    /**
     * Starts a rich low-frequency ambient space hum.
     * Utilizes a low LPF (Low-Pass Filter) modulated by an LFO for sub-spectral sweeps.
     */
    static startAmbientSpaceHum(baseFreq?: number): void;
    /**
     * Adjusts the carrier frequency and filter peak based on physical updates.
     */
    static updateAmbientFrequency(freq: number): void;
    /**
     * Safely stops the stateful ambient space drone.
     */
    static stopAmbientSpaceHum(): void;
}
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