import * as L from '../lang.js';
export declare type PitchClass = string;
export declare type Octave = number;
export declare type Duration = {
    _scamperTag: 'struct';
    kind: 'dur';
    fields: [number, number];
};
export declare const dur: (num: number, den: number) => Duration;
export declare type Note = {
    renderAs: 'composition';
    tag: 'note';
    note: number;
    duration: Duration;
};
export declare type NoteFreq = {
    renderAs: 'composition';
    tag: 'note-freq';
    freq: number;
    duration: Duration;
};
declare type Empty = {
    renderAs: 'composition';
    tag: 'empty';
};
declare type Rest = {
    renderAs: 'composition';
    tag: 'rest';
    duration: Duration;
};
declare type Trigger = {
    renderAs: 'composition';
    tag: 'trigger';
    fn: L.FunctionType;
};
declare type Par = {
    renderAs: 'composition';
    tag: 'par';
    notes: Composition[];
};
declare type Seq = {
    renderAs: 'composition';
    tag: 'seq';
    notes: Composition[];
};
declare type Pickup = {
    renderAs: 'composition';
    tag: 'pickup';
    pickup: Composition;
    notes: Composition;
};
declare type ModKind = Percussion | PitchBend | Tempo | Dynamics | Instrument;
declare type Percussion = {
    _scamperTag: 'struct';
    kind: 'mod';
    type: 'percussion';
    fields: [];
};
declare type PitchBend = {
    _scamperTag: 'struct';
    kind: 'mod';
    type: 'pitchBend';
    fields: [number];
};
declare type Tempo = {
    _scamperTag: 'struct';
    kind: 'mod';
    type: 'tempo';
    fields: [Duration, number];
};
declare type Dynamics = {
    _scamperTag: 'struct';
    kind: 'mod';
    type: 'dynamics';
    fields: [number];
};
declare type Instrument = {
    _scamperTag: 'struct';
    kind: 'mod';
    type: 'instrument';
    fields: [number];
};
export declare type Mod = {
    renderAs: 'composition';
    tag: 'mod';
    note: Composition;
    mod: ModKind;
};
export declare const mod: (mod: ModKind, note: Composition) => Mod;
export declare const modPrim: L.Prim;
export declare type Composition = Empty | Note | NoteFreq | Rest | Trigger | Par | Seq | Pickup | Mod;
export declare const musicLib: L.Env;
export declare function playComposition(env: L.Env, composition: Composition): number;
export {};
//# sourceMappingURL=music.d.ts.map