synapse-storage/dist/core/storage/middlewares/sync-storage-shallow-compare.middleware.js

Набор инструментов для управления состоянием и апи-запросами

import { VALUE_NOT_CHANGED } from "../utils/middleware-module.js";
import { shallowEqual } from "../utils/state-diff.util.js";





const syncShallowCompareMiddleware = (options = {})=>{
    const { comparator = shallowEqual, segments = [] } = options;
    const valueCache = new Map();
    return {
        name: 'sync-shallow-compare',
        setup: ()=>{},
        reducer: (_api)=>(next)=>(action)=>{
                    if (action.type !== 'set' || segments.length && !segments.includes(action.metadata?.segment ?? 'default')) {
                        return next(action);
                    }
                    const cacheKey = action.key;
                    const prevValue = valueCache.get(cacheKey);
                    const nextValue = action.value;
                    if (prevValue !== undefined && comparator(prevValue, nextValue)) {
                        return VALUE_NOT_CHANGED;
                    }
                    const result = next(action);
                    valueCache.set(cacheKey, result !== undefined ? result : nextValue);
                    return result;
                }
    };
};

export { syncShallowCompareMiddleware };

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