@jsoldi/hkt/dist/classes/traversable.js

Higher kinded types for typescript and a few utility monads.

import { chain, id } from "../core/utils.js";
const is_traversable = Symbol("is_traversable");
/** Creates an `ITraversable` from an `ITraversableBase`. */
export function traversable(base) {
    if (is_traversable in base)
        return base;
    const sequence = (m) => base.traverse(m)(id);
    const nestTraversable = (g) => traversable({
        traverse: m => chain(g.traverse(m), base.traverse(m))
    });
    return {
        ...{ [is_traversable]: true },
        sequence,
        nestTraversable,
        ...base
    };
}
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