react-laze/dist/cjs/development/index.cjs

Lazily render components in React

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/index.ts
var src_exports = {};
__export(src_exports, {
  default: () => useLaze
});
module.exports = __toCommonJS(src_exports);

// src/useLaze.ts
var import_react4 = require("react");

// src/useReactiveRef.ts
var import_react3 = require("react");

// src/useConstant.ts
var import_react2 = require("react");

// src/useLazyRef.ts
var import_react = require("react");
function useLazyRef(supplier) {
  const ref = (0, import_react.useRef)();
  if (!ref.current) {
    ref.current = {
      current: supplier()
    };
  }
  (0, import_react.useDebugValue)(ref.current);
  return ref.current;
}

// src/useConstant.ts
function useConstant(supplier) {
  const { current } = useLazyRef(supplier);
  (0, import_react2.useDebugValue)(current);
  return current;
}

// src/useReactiveRef.ts
function useReactiveRef(supplier) {
  const [state, setState] = (0, import_react3.useState)(supplier);
  const ref = useLazyRef(supplier);
  if (ref.current !== state) {
    ref.current = state;
  }
  const proxyObject = useConstant(() => ({
    get current() {
      return ref.current;
    },
    set current(value) {
      setState(() => value);
    }
  }));
  (0, import_react3.useDebugValue)(proxyObject);
  return proxyObject;
}

// src/useLaze.ts
function useLaze(options) {
  const [visible, setVisible] = (0, import_react4.useState)(false);
  const ref = useReactiveRef(() => null);
  const { current } = ref;
  const shouldRefresh = options == null ? void 0 : options.refresh;
  (0, import_react4.useEffect)(() => {
    setVisible(false);
    if (current) {
      const observer = new IntersectionObserver((entries) => {
        for (const entry of entries) {
          if (shouldRefresh) {
            setVisible(entry.isIntersecting);
          } else if (entry.isIntersecting) {
            setVisible(true);
            observer.disconnect();
          }
        }
      });
      observer.observe(current);
      return () => {
        observer.unobserve(current);
        observer.disconnect();
      };
    }
    return void 0;
  }, [current, shouldRefresh]);
  const value = {
    ref,
    visible
  };
  (0, import_react4.useDebugValue)(value);
  return value;
}
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