@unsplash/sum-types-fast-check/dist/esm/index.js

fast-check bindings for @unsplash/sum-types.

import fc from "fast-check";
export const nullaryArb = fc.constant(null);
export const getArb = (sum) => (arbs) => {
    const tags = Object.keys(arbs);
    const tagArb = fc.constantFrom(...tags);
    return (tagArb
        .chain(tag => arbs[tag].map(val => [tag, val]))
        .map(([tag, val]) => (val === null ? sum.mk[tag] : sum.mk[tag](val))));
};