useLayerOrder.js
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import useEnhancedEffect from '@mui/utils/useEnhancedEffect';
import useId from '@mui/utils/useId';
import GlobalStyles from "../GlobalStyles/index.js";
import useThemeWithoutDefault from "../useThemeWithoutDefault/index.js";
/**
* This hook returns a `GlobalStyles` component that sets the CSS layer order (for server-side rendering).
* Then on client-side, it injects the CSS layer order into the document head to ensure that the layer order is always present first before other Emotion styles.
*/
import { jsx as _jsx } from "react/jsx-runtime";
export default function useLayerOrder(theme) {
const upperTheme = useThemeWithoutDefault();
const id = useId() || '';
const {
modularCssLayers
} = theme;
let layerOrder = 'mui.global, mui.components, mui.theme, mui.custom, mui.sx';
if (!modularCssLayers || upperTheme !== null) {
// skip this hook if upper theme exists.
layerOrder = '';
} else if (typeof modularCssLayers === 'string') {
layerOrder = modularCssLayers.replace(/mui(?!\.)/g, layerOrder);
} else {
layerOrder = `@layer ${layerOrder};`;
}
useEnhancedEffect(() => {
const head = document.querySelector('head');
if (!head) {
return;
}
const firstChild = head.firstChild;
if (layerOrder) {
// Only insert if first child doesn't have data-mui-layer-order attribute
if (firstChild && firstChild.hasAttribute?.('data-mui-layer-order') && firstChild.getAttribute('data-mui-layer-order') === id) {
return;
}
const styleElement = document.createElement('style');
styleElement.setAttribute('data-mui-layer-order', id);
styleElement.textContent = layerOrder;
head.prepend(styleElement);
} else {
head.querySelector(`style[data-mui-layer-order="${id}"]`)?.remove();
}
}, [layerOrder, id]);
if (!layerOrder) {
return null;
}
return /*#__PURE__*/_jsx(GlobalStyles, {
styles: layerOrder
});
}