@typed/fp/esm/Fx.js

Data Structures and Resources for fp-ts

import { ap as ap_ } from 'fp-ts/Chain';
import { isLeft } from 'fp-ts/Either';
/**
 * Extract the values being returned to the internal Fx
 * @category Combinator
 * @since 0.13.0
 */
export function doFx(generatorFn) {
    return {
        [Symbol.iterator]: generatorFn,
    };
}
/**
 * @category Constructor
 * @since 0.13.0
 */
export const pure = (value) => 
// eslint-disable-next-line require-yield
doFx(function* () {
    return value;
});
/**
 * @category Constructor
 * @since 0.13.0
 */
export const fromIO = (io) => 
// eslint-disable-next-line require-yield
doFx(function* () {
    return io();
});
/**
 * @category URI
 * @since 0.13.0
 */
export const URI = '@typed/fp/Fx';
/**
 * @category Combinator
 * @since 0.13.0
 */
export const map = (f) => (fa) => doFx(function* () {
    return f(yield* fa);
});
/**
 * @category Instance
 * @since 0.13.0
 */
export const Functor = {
    URI,
    map,
};
/**
 * @category Constructor
 * @since 0.13.0
 */
export const of = pure;
/**
 * @category Instance
 * @since 0.13.0
 */
export const Pointed = {
    of,
};
/**
 * @category Combinator
 * @since 0.13.0
 */
export const chain = (f) => (fa) => doFx(function* () {
    const a = yield* fa;
    return yield* f(a);
});
/**
 * @category Instance
 * @since 0.13.0
 */
export const Monad = {
    ...Pointed,
    ...Functor,
    chain,
};
/**
 * @category Combinator
 * @since 0.13.0
 */
export const chainRec = (f) => (value) => doFx(function* () {
    let either = yield* f(value);
    while (isLeft(either)) {
        either = yield* f(either.left);
    }
    return either.right;
});
/**
 * @category Instance
 * @since 0.13.0
 */
export const ChainRec = {
    URI,
    chainRec,
};
/**
 * @category Combinator
 * @since 0.13.0
 */
export const ap = ap_(Monad);
/**
 * @category Instance
 * @since 0.13.0
 */
export const Apply = { ...Functor, ap };
/**
 * @category Instance
 * @since 0.13.0
 */
export const Applicative = { ...Pointed, ...Apply };
/**
 * @category Instance
 * @since 0.13.0
 */
export const FromIO = { URI, fromIO };
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