@typed/lenses/cjs/pipe.d.ts

Strongly-typed functional lenses

import { Head, Tail } from '@typed/lambda';
import { Lens, LensInput, LensOutput } from './Lens';
import { PathLens } from './PathLens';
import { PropLens } from './PropLens';
export declare type PipeLenses<A extends Lenses> = A extends ReadonlyArray<PropLens<any>> ? PathLens<GetPropKeys<A>> : GetPipedLenses<LensInput<Head<A>>, LensOutput<Head<A>>, Tail<A>>;
export declare function pipe<A extends Lenses>(...lenses: A): PipeLenses<A>;
declare type GetPropKeys<A extends Lenses> = {
    [K in keyof A]: A[K] extends PropLens<infer R> ? R : never;
};
declare type Lenses = readonly [Lens<any, any>, Lens<any, any>, ...ReadonlyArray<Lens<any, any>>];
declare type GetPipedLenses<I, O, Lenses extends ReadonlyArray<Lens<any, any>>> = Lens<I, VerifyLensesAreValidAndGetOutput<O, Lenses>>;
declare type VerifyLensesAreValidAndGetOutput<O, A extends ReadonlyArray<Lens<any, any>>> = {
    complete: O extends LensInput<Head<A>> ? LensOutput<Head<A>> : {
        error: 'Invalid Lens composition';
        from: O;
        to: LensInput<Head<A>>;
    };
    continue: O extends LensInput<Head<A>> ? VerifyLensesAreValidAndGetOutput<LensOutput<Head<A>>, Tail<A>> : {
        error: 'Invalid Lens composition';
        from: O;
        to: LensInput<Head<A>>;
    };
}[Tail<A> extends [] ? 'complete' : 'continue'];
export {};
//# sourceMappingURL=pipe.d.ts.map