state-synchronizers/dist/compose-state-synchronizers.js

Deterministically update state based on other state

"use strict";
exports.__esModule = true;
exports.composeStateSynchronizers = void 0;
var topological_sorting_1 = require("./topological-sorting");
exports.composeStateSynchronizers = function (stateSynchronizers) {
    var edges = getEdges(stateSynchronizers);
    var synchronizersForState = getSynchronizersForState(stateSynchronizers);
    var orderOfSynchronizers = topological_sorting_1.getTopologicalSorting(edges).filter(function (stateKey) { return !!synchronizersForState[stateKey]; });
    var orderedSynchronizers = orderOfSynchronizers.flatMap(function (stateKey) { return synchronizersForState[stateKey]; });
    return function (state, previousState) {
        var lastState = state;
        orderedSynchronizers.forEach(function (synchronizer) { return (lastState = synchronizer(lastState, previousState)); });
        return lastState;
    };
};
var getEdges = function (stateSynchronizers) {
    var edges = {};
    stateSynchronizers.forEach(function (_a) {
        var stateKey = _a.stateKey, dependenciesKeys = _a.dependenciesKeys;
        dependenciesKeys.forEach(function (dependencyKey) {
            if (!edges[dependencyKey]) {
                edges[dependencyKey] = [];
            }
            edges[dependencyKey].push(stateKey);
        });
    });
    return edges;
};
var getSynchronizersForState = function (stateSynchronizers) {
    var synchronizersForState = {};
    stateSynchronizers.forEach(function (_a) {
        var stateKey = _a.stateKey, synchronizer = _a.synchronizer;
        if (!synchronizersForState[stateKey]) {
            synchronizersForState[stateKey] = [];
        }
        synchronizersForState[stateKey].push(synchronizer);
    });
    return synchronizersForState;
};