@ucam/design-system/HydrationChecker/HydrationChecker.js

University of Cambridge Design System

'use strict';

var React = require('react');
var useHydrated = require('../useHydrated/useHydrated.js');
var core = require('@material-ui/core');
var PropTypes = require('prop-types');

function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

var React__default = /*#__PURE__*/_interopDefaultLegacy(React);
var PropTypes__default = /*#__PURE__*/_interopDefaultLegacy(PropTypes);

/**
 * A Component that tells children when the react hydration run has finished.
 * This is required so that the hydration run matches the SSR.
 * Children can retrieve the hydration status using the useHydrated hook.
 * It is generally not required to use this component directly as it is included by `<ThemeProvider />`
 */
const HydrationChecker = ({ children }) => {
    // undefined if this is the top level
    const parentHydrated = useHydrated.useHydrated({ ignoreWarnings: true });
    const [isSomewhatHydrated, setIsSomewhatHydrated] = React.useState(false);
    core.unstable_useEnhancedEffect(() => {
        setIsSomewhatHydrated(true);
    }, []);
    // hydration has finished when the top level is hydrated
    const isHydrated = parentHydrated === undefined ? isSomewhatHydrated : parentHydrated;
    return React__default['default'].createElement(useHydrated.HydrationCheckerContext.Provider, { value: isHydrated }, children);
};
HydrationChecker.propTypes = {
    children: PropTypes__default['default'].node
};

module.exports = HydrationChecker;
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