typedux/dist/esm/selectors/SelectorChain.js

Slightly adjusted Redux (awesome by default) for TS

import { isNumber, toNumber } from "@3fv/guard";
function continueSelectorChain(store, state, data, keyPath = []) {
    keyPath = keyPath || [];
    // noinspection DuplicatedCode
    const nextSelector = (() => {
        // TRACK FIRST PROP ACCESS
        const firstGet = keyPath.map(() => true);
        // CHECK IF KEY SHOULD BE NUMBER
        function resolveKey(value, key, index) {
            if (firstGet[index]) {
                if (Array.isArray(value)) {
                    const keyNum = toNumber(key);
                    if (isNumber(keyNum)) {
                        key = keyPath[index] = keyNum;
                    }
                }
                firstGet[index] = false;
            }
            return key;
        }
        function getterFn(state) {
            return keyPath.reduce((value, key, index) => {
                return value[resolveKey(value, key, index)];
            }, state);
        }
        const getter = Object.assign(getterFn, {
            subscribe(listener) {
                return store.observe(getterFn, listener);
            }
        });
        return getter; // overrideCallback(getter, keyPath)
    });
    return (new Proxy(nextSelector, {
        get: (target, key) => {
            return continueSelectorChain(store, state, undefined, [...keyPath, key]);
        }
    }));
}
//PropChainType<S, S,SelectorChainDataAccessor<S,S>>
export function selectorChain(store, state) {
    return continueSelectorChain(store, state, state);
}
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