text: import * as React from 'react';
  import PropTypes from 'prop-types';
  import clsx from 'clsx';
  import { integerPropType, deepmerge } from '@material-ui/utils';
  import { unstable_composeClasses as composeClasses } from '@material-ui/unstyled';
  import useThemeProps from '../styles/useThemeProps';
  import experimentalStyled from '../styles/experimentalStyled';
  import { getStepperUtilityClass } from './stepperClasses';
  import StepConnector from '../StepConnector';
  import StepperContext from './StepperContext';
  
  const overridesResolver = (props, styles) => {
    const { styleProps } = props;
    return deepmerge(
      {
        ...styles[styleProps.orientation],
        ...(styleProps.alternativeLabel && styles.alternativeLabel),
      },
      styles.root || {},
    );
  };
  
  const useUtilityClasses = (styleProps) => {
    const { orientation, alternativeLabel, classes } = styleProps;
    const slots = {
      root: ['root', orientation, alternativeLabel && 'alternativeLabel'],
    };
  
    return composeClasses(slots, getStepperUtilityClass, classes);
  };
  
  const StepperRoot = experimentalStyled(
    'div',
    {},
    {
      name: 'MuiStepper',
      slot: 'Root',
      overridesResolver,
    },
  )(({ styleProps }) => ({
    display: 'flex',
    ...(styleProps.orientation === 'horizontal' && {
      flexDirection: 'row',
      alignItems: 'center',
    }),
    ...(styleProps.orientation === 'vertical' && {
      flexDirection: 'column',
    }),
    ...(styleProps.alternativeLabel && {
      alignItems: 'flex-start',
    }),
  }));
  
  const defaultConnector = <StepConnector />;
  
  const Stepper = React.forwardRef(function Stepper(inProps, ref) {
    const props = useThemeProps({ props: inProps, name: 'MuiStepper' });
    const {
      activeStep = 0,
      alternativeLabel = false,
      children,
      className,
      connector = defaultConnector,
      nonLinear = false,
      orientation = 'horizontal',
      ...other
    } = props;
  
    const styleProps = {
      ...props,
      alternativeLabel,
      orientation,
    };
  
    const classes = useUtilityClasses(styleProps);
  
    const childrenArray = React.Children.toArray(children).filter(Boolean);
    const steps = childrenArray.map((step, index) => {
      return React.cloneElement(step, {
        index,
        last: index + 1 === childrenArray.length,
        ...step.props,
      });
    });
    const contextValue = React.useMemo(
      () => ({ activeStep, alternativeLabel, connector, nonLinear, orientation }),
      [activeStep, alternativeLabel, connector, nonLinear, orientation],
    );
  
    return (
      <StepperContext.Provider value={contextValue}>
        <StepperRoot
          styleProps={styleProps}
          className={clsx(classes.root, className)}
          ref={ref}
          {...other}
        >
          {steps}
        </StepperRoot>
      </StepperContext.Provider>
    );
  });
  
  Stepper.propTypes /* remove-proptypes */ = {
    // ----------------------------- Warning --------------------------------
    // | These PropTypes are generated from the TypeScript type definitions |
    // |     To update them edit the d.ts file and run "yarn proptypes"     |
    // ----------------------------------------------------------------------
    /**
     * Set the active step (zero based index).
     * Set to -1 to disable all the steps.
     * @default 0
     */
    activeStep: integerPropType,
    /**
     * If set to 'true' and orientation is horizontal,
     * then the step label will be positioned under the icon.
     * @default false
     */
    alternativeLabel: PropTypes.bool,
    /**
     * Two or more `<Step />` components.
     */
    children: PropTypes.node,
    /**
     * Override or extend the styles applied to the component.
     */
    classes: PropTypes.object,
    /**
     * @ignore
     */
    className: PropTypes.string,
    /**
     * An element to be placed between each step.
     * @default <StepConnector />
     */
    connector: PropTypes.element,
    /**
     * If set the `Stepper` will not assist in controlling steps for linear flow.
     * @default false
     */
    nonLinear: PropTypes.bool,
    /**
     * The component orientation (layout flow direction).
     * @default 'horizontal'
     */
    orientation: PropTypes.oneOf(['horizontal', 'vertical']),
    /**
     * The system prop that allows defining system overrides as well as additional CSS styles.
     */
    sx: PropTypes.object,
  };
  
  export default Stepper;
  