40 lines
1.5 KiB
JavaScript
40 lines
1.5 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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var react_1 = require("react");
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var util_1 = require("./misc/util");
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var getInitialState = function (query, defaultState) {
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// Prevent a React hydration mismatch when a default value is provided by not defaulting to window.matchMedia(query).matches.
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if (defaultState !== undefined) {
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return defaultState;
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}
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if (util_1.isBrowser) {
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return window.matchMedia(query).matches;
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}
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// A default value has not been provided, and you are rendering on the server, warn of a possible hydration mismatch when defaulting to false.
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if (process.env.NODE_ENV !== 'production') {
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console.warn('`useMedia` When server side rendering, defaultState should be defined to prevent a hydration mismatches.');
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}
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return false;
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};
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var useMedia = function (query, defaultState) {
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var _a = react_1.useState(getInitialState(query, defaultState)), state = _a[0], setState = _a[1];
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react_1.useEffect(function () {
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var mounted = true;
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var mql = window.matchMedia(query);
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var onChange = function () {
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if (!mounted) {
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return;
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}
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setState(!!mql.matches);
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};
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mql.addEventListener('change', onChange);
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setState(mql.matches);
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return function () {
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mounted = false;
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mql.removeEventListener('change', onChange);
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};
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}, [query]);
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return state;
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};
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exports.default = useMedia;
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