export declare const id: (x: any) => any;
export type OpticType = 'Equivalence' | 'Iso' | 'Lens' | 'Prism' | 'Traversal' | 'Getter' | 'AffineFold' | 'Fold' | 'Setter';
type CompositionType = {
    [T in OpticType]: {
        [U in OpticType]: OpticType | undefined;
    };
};
export declare const compositionType: CompositionType;
type Profunctor = any;
interface OpticFn {
    _tag: OpticType;
    _removable?: true | undefined;
    (P: Profunctor, optic: OpticFn): any;
}
export declare const eq: OpticFn;
export declare const iso: (there: (x: any) => any, back: (x: any) => any) => OpticFn;
export declare const lens: (view: (x: any) => any, update: (x: any) => any) => OpticFn;
export declare const elems: OpticFn;
export declare const to: (fn: (a: any) => any) => OpticFn;
export declare const modify: (optic: any, fn: (x: any) => any, source: any) => any;
export declare const set: (optic: any, value: any, source: any) => any;
export declare const remove: (optic: any, source: any) => any;
export declare const get: (optic: any, source: any) => any;
export declare const preview: (optic: any, source: any) => any;
export declare const collect: (optic: any, source: any) => any;
export declare const indexed: OpticFn;
export declare const prop: (key: string) => OpticFn;
export declare const pick: (keys: string[]) => OpticFn;
export declare const nth: (n: number) => OpticFn;
export declare const when: (pred: (x: any) => boolean) => OpticFn;
export declare const at: (i: number) => OpticFn;
export declare const atKey: (key: string) => OpticFn;
export declare const optional: OpticFn;
export declare const guard: <A, U extends A>(fn: (a: A) => a is U) => OpticFn;
export declare const find: (predicate: (item: any) => boolean) => OpticFn;
export declare const filter: (predicate: (item: any) => boolean) => OpticFn;
export declare const valueOr: (defaultValue: any) => OpticFn;
export declare const partsOf: (traversal: Optic) => OpticFn;
export declare const reread: (fn: (value: any) => any) => OpticFn;
export declare const rewrite: (fn: (value: any) => any) => OpticFn;
export declare const prependTo: OpticFn;
export declare const appendTo: OpticFn;
export declare const chars: OpticFn;
export declare const words: OpticFn;
export declare class Optic {
    _ref: OpticFn;
    constructor(_ref: OpticFn);
    get _tag(): OpticType;
    get _removable(): true | undefined;
    compose(other: Optic): Optic;
    iso(there: (x: any) => any, back: (x: any) => any): Optic;
    lens(view: (x: any) => any, set: (x: any, y: any) => any): Optic;
    indexed(): Optic;
    prop(key: string): Optic;
    path(...keys: string[]): Optic;
    pick(keys: string[]): Optic;
    nth(n: number): Optic;
    filter(predicate: (item: any) => boolean): Optic;
    valueOr(defaultValue: any): Optic;
    partsOf(traversalOrFn: any): Optic;
    reread(fn: (value: any) => any): Optic;
    rewrite(fn: (value: any) => any): Optic;
    optional(): Optic;
    guard_(): (fn: (value: any) => any) => Optic;
    guard(fn: (value: any) => any): Optic;
    at(i: number): Optic;
    head(): Optic;
    index(i: number): Optic;
    find(predicate: (item: any) => boolean): Optic;
    elems(): Optic;
    to(fn: (a: any) => any): Optic;
    when(predicate: (elem: any) => boolean): Optic;
    chars(): Optic;
    words(): Optic;
    prependTo(): Optic;
    appendTo(): Optic;
}
export declare const optic: Optic;
export {};