redext/dist/hooks/useSelector.mjs

A simple global store based on React Context and Hooks

// src/hooks/useContextSelector.ts
import { useContext, useSyncExternalStore } from "react";

// src/Context.tsx
import { createContext } from "react";
var Context_default = createContext({});

// src/hooks/useDeepMemo.ts
import React from "react";

// src/hooks/useDeepMemoize.ts
import { useRef } from "react";

// src/utils/deepEqual.ts
var equal = (a, b) => {
  let ctor;
  let len;
  if (a === b) {
    return true;
  }
  if (a && b && (ctor = a.constructor) === b.constructor) {
    if (ctor === Date) {
      return a.getTime() === b.getTime();
    }
    if (ctor === RegExp) {
      return a.toString() === b.toString();
    }
    if (ctor === Array && (len = a.length) === b.length) {
      while (len-- && equal(a[len], b[len])) ;
      return len === -1;
    }
    if (ctor === Object) {
      if (Object.keys(a).length !== Object.keys(b).length) {
        return false;
      }
      for (len in a) {
        if (!(len in b) || !equal(a[len], b[len])) {
          return false;
        }
      }
      return true;
    }
  }
  return a !== a && b !== b;
};
function deepEqual(a, b) {
  try {
    return equal(a, b);
  } catch (error) {
    if (error.message && error.message.match(/stack|recursion/i) || error.number === -2146828260) {
      console.warn("Warning: deepEqual does not handle circular references.", error.name, error.message);
      return false;
    }
    throw error;
  }
}

// src/hooks/useDeepMemoize.ts
var useDeepMemoize = (value) => {
  const ref = useRef([]);
  if (!deepEqual(value, ref.current)) {
    ref.current = value;
  }
  return ref.current;
};
var useDeepMemoize_default = useDeepMemoize;

// src/utils/checkDeps.ts
var isPrimitive = (val) => {
  return val == null || /^[sbn]/.test(typeof val);
};
var checkDeps = (deps, name) => {
  const hookName = `React.${name.replace(/Deep/, "")}`;
  if (!deps || deps.length === 0) {
    console.warn(`${name} should not be used with no dependencies. Use ${hookName} instead.`);
  }
  if (deps.every(isPrimitive)) {
    console.warn(`${name} should not be used with dependencies that are all primitive values. Use ${hookName} instead.`);
  }
};
var checkDeps_default = checkDeps;

// src/hooks/useDeepMemo.ts
var useDeepMemo = (factory, dependencies) => {
  if (process.env.NODE_ENV !== "production") {
    checkDeps_default(dependencies, "useDeepMemo");
  }
  return React.useMemo(factory, useDeepMemoize_default(dependencies));
};
var useDeepMemo_default = useDeepMemo;

// src/hooks/useContextSelector.ts
var useContextSelector = (mapStateToProps, params = {}) => {
  const { isWithSyncExternalStore = true } = params;
  if (isWithSyncExternalStore && useSyncExternalStore) {
    const { subscribe, getState } = useContext(Context_default);
    const getSnapshot = () => {
      if (!mapStateToProps) {
        return void 0;
      }
      const state2 = getState();
      return mapStateToProps(state2);
    };
    return useSyncExternalStore(subscribe, getSnapshot, getSnapshot);
  }
  const { state = {} } = useContext(Context_default);
  let filteredState = {};
  if (mapStateToProps) {
    filteredState = mapStateToProps(state);
  } else {
    filteredState = state;
  }
  return useDeepMemo_default(() => {
    return filteredState;
  }, [filteredState]);
};
var useContextSelector_default = useContextSelector;

// src/hooks/useSelector.ts
var useSelector = (mapStateToProps) => {
  return useContextSelector_default(mapStateToProps);
};
var useSelector_default = useSelector;
export {
  useSelector_default as default
};