/**
 * Contains classes for controlling FX in Reaper
 * @module
 */
import { INotifyPropertyChanged } from './Notify';
import { ReaperOscEvent } from './Client/Events';
import { ReaperOscCommand } from './Client/Commands';
declare type SendCommand = (command: ReaperOscCommand) => void;
/**
 * A Reaper FX.
 *
 * @example
 * ```typescript
 * // Open an FX UI window
 * fx.openUi();
 * // Bypass the FX
 * fx.bypass();
 * ```
 */
export declare abstract class Fx implements INotifyPropertyChanged {
    protected _isBypassed: boolean;
    protected _isUiOpen: boolean;
    protected _name: string;
    protected _preset: string;
    protected readonly _send: SendCommand;
    constructor(name: string, send: SendCommand);
    /** Bypass the FX */
    abstract bypass(): void;
    /** Close the UI of the FX */
    abstract closeUi(): void;
    /** Indicates whether the FX is bypassed */
    get isBypassed(): boolean;
    /** Indicates whether the FX's UI is open */
    get isUiOpen(): boolean;
    /** The name of the FX */
    get name(): string;
    /** Load the next FX preset */
    abstract nextPreset(): void;
    onPropertyChanged(property: string, callback: () => void): () => void;
    /** Open the UI of the FX */
    abstract openUi(): void;
    /**
     * The name of the current preset.
     *
     * **Update behaviour varies by subclass:**
     * - `DeviceSelectedFx` — updated in real time whenever the preset changes, because Reaper
     *   sends `/fx/preset` in response to every preset navigation command.
     * - `SelectedTrackFxSlot` and `TrackFx` — only updated during a sync burst
     *   (`refreshControlSurfaces()`), because Reaper only sends `/fx/{n}/preset` and
     *   `/track/{n}/fx/{m}/preset` as part of the full state refresh, not in response to
     *   individual preset commands.
     *
     * If you need live preset feedback, use `DeviceSelectedFx` (via `selectedTrack.selectedFx`
     * after calling `device.selectFx(n)` to point it at the desired slot).
     */
    get preset(): string;
    /** Load the previous FX preset */
    abstract previousPreset(): void;
    /** Unbypass the FX */
    abstract unbypass(): void;
    /** Handle a typed incoming event */
    abstract handleEvent(event: ReaperOscEvent): void;
}
/**
 * An FX on a {@link Track}
 */
export declare class TrackFx extends Fx {
    readonly trackNumber: number;
    readonly fxNumber: number;
    /**
     * @param trackNumber The number of the track the FX is on
     * @param fxNumber The FX number in the current bank
     * @param send A callback used to send typed commands to Reaper
     */
    constructor(trackNumber: number, fxNumber: number, send: SendCommand);
    get oscAddress(): string;
    handleEvent(event: ReaperOscEvent): void;
    private _matchesTrackFx;
    bypass(): void;
    unbypass(): void;
    openUi(): void;
    closeUi(): void;
    nextPreset(): void;
    previousPreset(): void;
}
/**
 * An FX slot on the OSC device's currently selected track (addressed via `/fx/N/`).
 */
export declare class SelectedTrackFxSlot extends Fx {
    readonly fxNumber: number;
    /**
     * @param fxNumber The FX slot number in the device FX bank
     * @param send A callback used to send typed commands to Reaper
     */
    constructor(fxNumber: number, send: SendCommand);
    handleEvent(event: ReaperOscEvent): void;
    private _matchesFx;
    bypass(): void;
    unbypass(): void;
    openUi(): void;
    closeUi(): void;
    nextPreset(): void;
    previousPreset(): void;
}
/**
 * The OSC device's currently focused FX (addressed via `/fx/` with no slot number).
 */
export declare class DeviceSelectedFx extends Fx {
    /**
     * @param send A callback used to send typed commands to Reaper
     */
    constructor(send: SendCommand);
    handleEvent(event: ReaperOscEvent): void;
    bypass(): void;
    unbypass(): void;
    openUi(): void;
    closeUi(): void;
    nextPreset(): void;
    previousPreset(): void;
}
export {};