'use strict';
var entries = require('object.entries');
/**
 * @template {object} T
 * @param {T} start
 * @param {Record<string, ((data: T) => unknown) & { key?: string }>} props
 * @returns {Promise<T>}
 */
function promiseRipple(start, props) {
    /** @type {Promise<unknown>} */
    var seed = Promise.resolve(null);
    return entries(props).reduce(function (acc, _a) {
        var key = _a[0], action = _a[1];
        return acc.then(function () {
            if (typeof action !== 'function') {
                throw new Error('property values must be functions');
            }
            var fn = /** @type {(data: object) => unknown} */ (action);
            return Promise.resolve(fn(start)).then(function (value) {
                var _a;
                if (start === value) {
                    return value;
                }
                Object.assign(start, (_a = {}, _a[key] = value, _a));
                return value;
            });
        });
    }, seed)
        .then(function () { return start; });
}
module.exports = promiseRipple;