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material-ui/packages/material-ui/src/styles/createMuiTheme.js
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import { deepmerge } from '@material-ui/utils';
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import createBreakpoints from './createBreakpoints';
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import createMixins from './createMixins';
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import createPalette from './createPalette';
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import createTypography from './createTypography';
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import createSpacing from './createSpacing';
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import transitions from './transitions';
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const {
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breakpoints: breakpointsInput = {},
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mixins: mixinsInput = {},
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...other
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} = options;
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const palette = createPalette(paletteInput);
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const breakpoints = createBreakpoints(breakpointsInput);
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const spacing = createSpacing(spacingInput);
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mixins: createMixins(breakpoints, spacing, mixinsInput),
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overrides: {}, // Inject custom styles
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palette,
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shadows: shadowsInput || shadows,
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typography: createTypography(palette, typographyInput),
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shape,
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transitions,
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if (process.env.NODE_ENV !== 'production') {
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const pseudoClasses = [
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'checked',
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'disabled',
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'error',
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'focused',
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'focusVisible',
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'required',
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'expanded',
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'selected',
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];
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const traverse = (node, parentKey, depth = 1) => {
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let key;
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// eslint-disable-next-line guard-for-in, no-restricted-syntax
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for (key in node) {
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const child = node[key];
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if (depth === 1) {
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if (key.indexOf('Mui') === 0 && child) {
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traverse(child, key, depth + 1);
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}
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} else if (pseudoClasses.indexOf(key) !== -1 && Object.keys(child).length > 0) {
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if (process.env.NODE_ENV !== 'production') {
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console.error(
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[
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`Material-UI: the \`${parentKey}\` component increases ` +
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`the CSS specificity of the \`${key}\` internal state.`,
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'You can not override it like this: ',
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JSON.stringify(node, null, 2),
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'',
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'Instead, you need to use the $ruleName syntax:',
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JSON.stringify(
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{
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root: {
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[`&$${key}`]: child,
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},
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null,
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2,
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),
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'',
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'https://material-ui.com/r/pseudo-classes-guide',
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].join('\n'),
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);
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}
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// Remove the style to prevent global conflicts.
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node[key] = {};
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traverse(muiTheme.overrides);