# Stepper

- Page: https://jiguang132.com/resources/material-ui/docs/steppers
- Resource: Material UI (https://jiguang132.com/resources/material-ui.md)
- All guides: https://jiguang132.com/resources/material-ui/docs.md

Represent ordered or non-linear steps with explicit active and error state.

This guide covers Material UI Core with the default Emotion engine; extensions and additional demos are explicitly classified.

## Use case and business boundary

The host owns workflow completion and validation; activeStep is not an automatic process engine.

## Native composition and scope

`MobileStepper`, `Step`, `StepButton`, `StepConnector`, `StepContent`, `StepIcon`, `StepLabel`, `Stepper`

Preserve native Material UI composition and types; do not substitute JGuang UI/Base UI/Radix APIs. Example entries are not extra components.

## Native installation and initialization

```bash
npm install @mui/material@9.4.0 @emotion/react@11.14.0 @emotion/styled@11.14.1
```

Use native npm and Emotion, not an invented JGuang UI Registry URL. Place examples inside native ThemeProvider; choose CssBaseline or ScopedCssBaseline for the project. Inspect React, existing providers, lockfile and SSR first. Never overwrite files or conceal peer conflicts. This batch verified React 19.2.8; React 18 and below require matching react-is. See the included bilingual setup guide.

## Practical native parameters

These selected parameters are not a flattened universal API. Preserve the native declaring owner, slot structure, nullable values and generics.

| Owner.prop | Practical role | Declaration source |
| --- | --- | --- |
| `Stepper.activeStep` | Zero-based active workflow step index. | `Stepper` |
| `Stepper.nonLinear` | Permit non-linear Stepper navigation; the host enforces actual prerequisites. | `Stepper` |
| `Stepper.orientation` | Native horizontal/vertical orientation, with owner-specific layout behavior. | `Stepper` |
| `Step.completed` | Host-controlled step-completion presentation; not automatic validation. | `Step` |
| `StepLabel.error` | Native visual error state; the host supplies validation and recovery. | `StepLabel` |

## Runnable native examples

Machine keys select example entries, not universal variant props. Native demo JSX/data stay unchanged; JGuang-authored acceptance fixtures are explicitly labelled.

- Linear · `HorizontalLinearStepper` · upstream native demo
- Non-linear · `HorizontalNonLinearStepper` · upstream native demo
- Alternative label · `HorizontalLinearAlternativeLabelStepper` · upstream native demo
- Error step · `HorizontalStepperWithError` · upstream native demo
- Customized horizontal stepper · `CustomizedSteppers` · upstream native demo
- Vertical stepper · `VerticalLinearStepper` · upstream native demo
- Alternative label · `VerticalLinearAlternativeLabelStepper` · upstream native demo
- Text · `TextMobileStepper` · upstream native demo
- Dots · `DotsMobileStepper` · upstream native demo
- Progress · `ProgressMobileStepper` · upstream native demo

## Actual usage example

Unmodified pinned native demo; copy its required local helper files together.

```tsx
import * as React from 'react';
import Box from '@mui/material/Box';
import Stepper from '@mui/material/Stepper';
import Step from '@mui/material/Step';
import StepLabel from '@mui/material/StepLabel';
import Button from '@mui/material/Button';
import Typography from '@mui/material/Typography';

const steps = ['Select campaign settings', 'Create an ad group', 'Create an ad'];

export default function HorizontalLinearStepper() {
  const [activeStep, setActiveStep] = React.useState(0);
  const [skipped, setSkipped] = React.useState(new Set<number>());

  const isStepOptional = React.useCallback((step: number) => {
    return step === 1;
  }, []);

  const isStepSkipped = (step: number) => {
    return skipped.has(step);
  };

  const handleNext = () => {
    let newSkipped = skipped;
    if (isStepSkipped(activeStep)) {
      newSkipped = new Set(newSkipped.values());
      newSkipped.delete(activeStep);
    }

    setActiveStep((prevActiveStep) => prevActiveStep + 1);
    setSkipped(newSkipped);
  };

  const handleBack = () => {
    setActiveStep((prevActiveStep) => prevActiveStep - 1);
  };

  const handleSkip = () => {
    if (!isStepOptional(activeStep)) {
      // You probably want to guard against something like this,
      // it should never occur unless someone's actively trying to break something.
      throw new Error("You can't skip a step that isn't optional.");
    }

    setActiveStep((prevActiveStep) => prevActiveStep + 1);
    setSkipped((prevSkipped) => {
      const newSkipped = new Set(prevSkipped.values());
      newSkipped.add(activeStep);
      return newSkipped;
    });
  };

  const handleReset = () => {
    setActiveStep(0);
  };

  const previousActiveStepRef = React.useRef(activeStep);
  const resetButtonRef = React.useRef<HTMLButtonElement>(null);
  const nextButtonRef = React.useRef<HTMLButtonElement>(null);

  // Manage focus when the active step changes.
  React.useEffect(() => {
    const previousActiveStep = previousActiveStepRef.current;
    previousActiveStepRef.current = activeStep;

    if (activeStep === steps.length) {
      // If the user has completed all steps and hits "Finish", focus the "Reset" button.
      resetButtonRef.current!.focus();
      return;
    }
    if (activeStep === 0 && previousActiveStep === steps.length) {
      // If the user has completed all steps and hits "Reset", focus the "Next" button.
      nextButtonRef.current!.focus();
      return;
    }
    if (isStepOptional(previousActiveStep) && !isStepOptional(activeStep)) {
      // If the user hits "Skip" and the next step is not optional, focus the "Next" button.
      nextButtonRef.current!.focus();
    }
  }, [activeStep, isStepOptional]);

  return (
    <Box sx={{ width: '100%' }}>
      <Stepper activeStep={activeStep}>
        {steps.map((label, index) => {
          const stepProps: { completed?: boolean } = {};
          const labelProps: {
            optional?: React.ReactNode;
          } = {};
          if (isStepOptional(index)) {
            labelProps.optional = (
              <Typography variant="caption">Optional</Typography>
            );
          }
          if (isStepSkipped(index)) {
            stepProps.completed = false;
          }
          return (
            <Step key={label} {...stepProps}>
              <StepLabel {...labelProps}>{label}</StepLabel>
            </Step>
          );
        })}
      </Stepper>
      {activeStep === steps.length ? (
        <React.Fragment>
          <Typography sx={{ mt: 2, mb: 1 }}>
            All steps completed - you&apos;re finished
          </Typography>
          <Box sx={{ display: 'flex', flexDirection: 'row', pt: 2 }}>
            <Box sx={{ flex: '1 1 auto' }} />
            <Button onClick={handleReset} ref={resetButtonRef}>
              Reset
            </Button>
          </Box>
        </React.Fragment>
      ) : (
        <React.Fragment>
          <Typography sx={{ mt: 2, mb: 1 }}>Step {activeStep + 1}</Typography>
          <Box sx={{ display: 'flex', flexDirection: 'row', pt: 2 }}>
            <Button
              color="inherit"
              disabled={activeStep === 0}
              onClick={handleBack}
              sx={{ mr: 1 }}
            >
              Back
            </Button>
            <Box sx={{ flex: '1 1 auto' }} />
            {isStepOptional(activeStep) && (
              <Button color="inherit" onClick={handleSkip} sx={{ mr: 1 }}>
                Skip
              </Button>
            )}
            <Button onClick={handleNext} ref={nextButtonRef}>
              {activeStep === steps.length - 1 ? 'Finish' : 'Next'}
            </Button>
          </Box>
        </React.Fragment>
      )}
    </Box>
  );
}

```

## Example dependency boundaries

`react`, `@mui/material/Box`, `@mui/material/Stepper`, `@mui/material/Step`, `@mui/material/StepLabel`, `@mui/material/Button`, `@mui/material/Typography`, `@mui/material/StepButton`, `@mui/material/styles`, `@mui/material/Stack`, `@mui/icons-material/Check`, `@mui/icons-material/Settings`, `@mui/icons-material/GroupAdd`, `@mui/icons-material/VideoLabel`, `@mui/material/StepConnector`, `@mui/material/StepIcon`, `@mui/material/StepContent`, `@mui/material/Paper`, `@mui/material/MobileStepper`, `@mui/icons-material/KeyboardArrowLeft`, `@mui/icons-material/KeyboardArrowRight`

Direct Icons/System/Utils example imports require their matching 9.4.0 packages. Relative data/helpers are part of the example closure, not extra components. Remote images and simulated operations do not supply a backend.

## Pinned upstream API metadata reference

These tables retain the upstream metadata, not a newly inferred generic type system. Conditional generics, inherited props and callback details are defined by the source declarations below. Theme defaults may override metadata defaults.

### MobileStepper

```tsx
import MobileStepper from '@mui/material/MobileStepper';
import { MobileStepper } from '@mui/material';
```

Native inheritance: `Paper`. Parent/DOM props are not fabricated as additional own props.

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `steps` | yes | `integer` | — |
| `activeStep` | no | `integer` | `0` |
| `backButton` | no | `node` | — |
| `classes` | no | `object` | — |
| `nextButton` | no | `node` | — |
| `position` | no | `'bottom' \| 'static' \| 'top'` | `'bottom'` |
| `slotProps` | no | `{ dot?: func \| object, dots?: func \| object, progress?: func \| object, root?: func \| object }` | `{}` |
| `slots` | no | `{ dot?: elementType, dots?: elementType, progress?: elementType, root?: elementType }` | `{}` |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |
| `variant` | no | `'dots' \| 'progress' \| 'text'` | `'dots'` |



### Step

```tsx
import Step from '@mui/material/Step';
import { Step } from '@mui/material';
```

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `active` | no | `bool` | — |
| `children` | no | `node` | — |
| `classes` | no | `object` | — |
| `completed` | no | `bool` | — |
| `component` | no | `elementType` | — |
| `disabled` | no | `bool` | — |
| `expanded` | no | `bool` | `false` |
| `index` | no | `integer` | — |
| `last` | no | `bool` | — |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |



### StepButton

```tsx
import StepButton from '@mui/material/StepButton';
import { StepButton } from '@mui/material';
```

Native inheritance: `ButtonBase`. Parent/DOM props are not fabricated as additional own props.

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `children` | no | `node` | — |
| `classes` | no | `object` | — |
| `icon` | no | `node` | — |
| `optional` | no | `node` | — |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |



### StepConnector

```tsx
import StepConnector from '@mui/material/StepConnector';
import { StepConnector } from '@mui/material';
```

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `classes` | no | `object` | — |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |



### StepContent

```tsx
import StepContent from '@mui/material/StepContent';
import { StepContent } from '@mui/material';
```

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `children` | no | `node` | — |
| `classes` | no | `object` | — |
| `slotProps` | no | `{ transition?: func \| object }` | `{}` |
| `slots` | no | `{ transition?: elementType }` | `{}` |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |
| `transitionDuration` | no | `'auto' \| number \| { appear?: number, enter?: number, exit?: number }` | `'auto'` |



### StepIcon

```tsx
import StepIcon from '@mui/material/StepIcon';
import { StepIcon } from '@mui/material';
```

Native inheritance: `SvgIcon`. Parent/DOM props are not fabricated as additional own props.

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `active` | no | `bool` | `false` |
| `classes` | no | `object` | — |
| `completed` | no | `bool` | `false` |
| `error` | no | `bool` | `false` |
| `icon` | no | `node` | — |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |



### StepLabel

```tsx
import StepLabel from '@mui/material/StepLabel';
import { StepLabel } from '@mui/material';
```

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `children` | no | `node` | — |
| `classes` | no | `object` | — |
| `error` | no | `bool` | `false` |
| `icon` | no | `node` | — |
| `optional` | no | `node` | — |
| `slotProps` | no | `{ label?: func \| object, root?: func \| object, stepIcon?: func \| object }` | `{}` |
| `slots` | no | `{ label?: elementType, root?: elementType, stepIcon?: elementType }` | `{}` |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |



### Stepper

```tsx
import Stepper from '@mui/material/Stepper';
import { Stepper } from '@mui/material';
```

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `activeStep` | no | `integer` | `0` |
| `alternativeLabel` | no | `bool` | `false` |
| `children` | no | `node` | — |
| `classes` | no | `object` | — |
| `component` | no | `elementType` | — |
| `connector` | no | `element` | `<StepConnector />` |
| `nonLinear` | no | `bool` | `false` |
| `orientation` | no | `'horizontal' \| 'vertical'` | `'horizontal'` |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |


## Native source declarations

Declarations/imports are extracted from pinned source without flattening unions or external inheritance. Original English comments/types are source reference, not a claim of translated upstream prose. Shared types stay in their native packages.

### vendor/src/MobileStepper/MobileStepper.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { Theme } from '../styles';

import { InternalStandardProps as StandardProps } from '../internal';

import { PaperProps } from '../Paper';

import { LinearProgressProps } from '../LinearProgress';

import { MobileStepperClasses } from './mobileStepperClasses';

import { CreateSlotsAndSlotProps, SlotProps } from '../utils/types';

export interface MobileStepperSlots {
  /**
   * The component that renders the root slot.
   * @default Paper
   */
  root: React.ElementType;
  /**
   * The component that renders the progress slot.
   * @default LinearProgress
   */
  progress: React.ElementType;
  /**
   * The component that renders the dots slot.
   * @default 'div'
   */
  dots: React.ElementType;
  /**
   * The component that renders the dot slot.
   * @default 'div'
   */
  dot: React.ElementType;
}

export interface MobileStepperRootSlotPropsOverrides {}

export interface MobileStepperProgressSlotPropsOverrides {}

export interface MobileStepperDotsSlotPropsOverrides {}

export interface MobileStepperDotSlotPropsOverrides {}

export type MobileStepperSlotsAndSlotProps = CreateSlotsAndSlotProps<
  MobileStepperSlots,
  {
    /**
     * Props forwarded to the root slot.
     * By default, the available props are based on the [Paper](https://mui.com/material-ui/api/paper/#props) component.
     */
    root: SlotProps<
      React.ElementType<PaperProps>,
      MobileStepperRootSlotPropsOverrides,
      MobileStepperOwnerState
    >;
    /**
     * Props forwarded to the progress slot.
     * By default, the available props are based on the [LinearProgress](https://mui.com/material-ui/api/linear-progress/#props) component.
     */
    progress: SlotProps<
      React.ElementType<LinearProgressProps>,
      MobileStepperProgressSlotPropsOverrides,
      MobileStepperOwnerState
    >;
    /**
     * Props forwarded to the dots slot.
     * By default, the available props are based on the div element.
     */
    dots: SlotProps<'div', MobileStepperDotsSlotPropsOverrides, MobileStepperOwnerState>;
    /**
     * Props forwarded to the dot slot.
     * By default, the available props are based on the div element.
     */
    dot: SlotProps<'div', MobileStepperDotSlotPropsOverrides, MobileStepperOwnerState>;
  }
>;

export interface MobileStepperProps
  extends StandardProps<PaperProps, 'children' | 'variant'>, MobileStepperSlotsAndSlotProps {
  /**
   * Set the active step (zero based index).
   * Defines which dot is highlighted when the variant is 'dots'.
   * @default 0
   */
  activeStep?: number | undefined;
  /**
   * A back button element. For instance, it can be a `Button` or an `IconButton`.
   */
  backButton: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<MobileStepperClasses> | undefined;
  /**
   * A next button element. For instance, it can be a `Button` or an `IconButton`.
   */
  nextButton: React.ReactNode;
  /**
   * Set the positioning type.
   * @default 'bottom'
   */
  position?: 'bottom' | 'top' | 'static' | undefined;
  /**
   * The total steps.
   */
  steps: number;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
  /**
   * The variant to use.
   * @default 'dots'
   */
  variant?: 'text' | 'dots' | 'progress' | undefined;
}

export interface MobileStepperOwnerState extends Omit<MobileStepperProps, 'slots' | 'slotProps'> {}

export default function MobileStepper(props: MobileStepperProps): React.JSX.Element;
```

### vendor/src/Step/Step.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { OverridableComponent, OverrideProps } from '../OverridableComponent';

import { Theme } from '../styles';

import { StepClasses } from './stepClasses';

export interface StepOwnProps {
  /**
   * Sets the step as active. Is passed to child components.
   */
  active?: boolean | undefined;
  /**
   * Should be `Step` sub-components such as `StepLabel`, `StepContent`.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<StepClasses> | undefined;
  /**
   * Mark the step as completed. Is passed to child components.
   */
  completed?: boolean | undefined;
  /**
   * If `true`, the step is disabled, will also disable the button if
   * `StepButton` is a child of `Step`. Is passed to child components.
   */
  disabled?: boolean | undefined;
  /**
   * Expand the step.
   * @default false
   */
  expanded?: boolean | undefined;
  /**
   * The position of the step.
   * The prop defaults to the value inherited from the parent Stepper component.
   */
  index?: number | undefined;
  /**
   * If `true`, the Step is displayed as rendered last.
   * The prop defaults to the value inherited from the parent Stepper component.
   */
  last?: boolean | undefined;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
}

export interface StepTypeMap<
  AdditionalProps = {},
  RootComponent extends React.ElementType = 'div',
> {
  props: AdditionalProps & StepOwnProps;
  defaultComponent: RootComponent;
}

export type StepProps<
  RootComponent extends React.ElementType = StepTypeMap['defaultComponent'],
  AdditionalProps = { component?: React.ElementType | undefined },
> = OverrideProps<StepTypeMap<AdditionalProps, RootComponent>, RootComponent> & {
  component?: React.ElementType | undefined;
};

export type StepClasskey = keyof NonNullable<StepProps['classes']>;

declare const Step: OverridableComponent<StepTypeMap>;
```

### vendor/src/StepButton/StepButton.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { ButtonBaseTypeMap, ExtendButtonBase, ExtendButtonBaseTypeMap } from '../ButtonBase';

import { OverrideProps } from '../OverridableComponent';

import { Theme } from '../styles';

import { StepButtonClasses } from './stepButtonClasses';

export interface StepButtonOwnProps {
  /**
   * Can be a `StepLabel` or a node to place inside `StepLabel` as children.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<StepButtonClasses> | undefined;
  /**
   * The icon displayed by the step label.
   */
  icon?: React.ReactNode;
  /**
   * The optional node to display.
   */
  optional?: React.ReactNode;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
}

export type StepButtonTypeMap<
  AdditionalProps,
  RootComponent extends React.ElementType,
> = ExtendButtonBaseTypeMap<{
  props: AdditionalProps & StepButtonOwnProps;
  defaultComponent: RootComponent;

  ignoredProps: 'disabled';
}>;

declare const StepButton: ExtendButtonBase<
  StepButtonTypeMap<{}, ButtonBaseTypeMap['defaultComponent']>
>;

export type StepButtonClasskey = keyof NonNullable<StepButtonProps['classes']>;

export type StepButtonProps<
  RootComponent extends React.ElementType = ButtonBaseTypeMap['defaultComponent'],
  AdditionalProps = {},
> = OverrideProps<StepButtonTypeMap<AdditionalProps, RootComponent>, RootComponent> & {
  component?: React.ElementType | undefined;
};
```

### vendor/src/StepConnector/StepConnector.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { Theme } from '../styles';

import { InternalStandardProps as StandardProps } from '../internal';

import { StepConnectorClasses } from './stepConnectorClasses';

export type StepConnectorIcon = React.ReactElement<unknown> | string | number;

export interface StepConnectorProps extends StandardProps<
  React.HTMLAttributes<HTMLDivElement>,
  'children'
> {
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<StepConnectorClasses> | undefined;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
}

export type StepConnectorClasskey = keyof NonNullable<StepConnectorProps['classes']>;

export default function StepConnector(props: StepConnectorProps): React.JSX.Element;
```

### vendor/src/StepContent/StepContent.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { Theme } from '../styles';

import { InternalStandardProps as StandardProps } from '../internal';

import { CollapseProps } from '../Collapse';

import { TransitionProps } from '../transitions/types';

import { StepContentClasses } from './stepContentClasses';

import { CreateSlotsAndSlotProps, SlotComponentProps } from '../utils/types';

export interface StepContentSlots {
  /**
   * The component that renders the transition slot.
   * [Follow this guide](/material-ui/transitions/#transition-slots) to learn more about the requirements for this component.
   * @default Collapse
   */
  transition?:
    | React.JSXElementConstructor<TransitionProps & { children: React.ReactElement<unknown, any> }>
    | undefined;
}

export type StepContentSlotsAndSlotProps = CreateSlotsAndSlotProps<
  StepContentSlots,
  {
    /**
     * Props forwarded to the transition slot.
     * By default, the available props are based on the [Collapse](https://mui.com/material-ui/api/collapse/#props) component
     */
    transition: SlotComponentProps<
      React.ElementType<CollapseProps>,
      CollapseProps,
      StepContentOwnerState
    >;
  }
>;

export interface StepContentOwnerState extends StepContentProps {}

export interface StepContentProps
  extends StandardProps<React.HTMLAttributes<HTMLDivElement>>, StepContentSlotsAndSlotProps {
  /**
   * The content of the component.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<StepContentClasses> | undefined;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
  /**
   * Adjust the duration of the content expand transition.
   * Passed as a prop to the transition component.
   *
   * Set to 'auto' to automatically calculate transition time based on height.
   * @default 'auto'
   */
  transitionDuration?: TransitionProps['timeout'] | 'auto' | undefined;
}

export type StepContentClasskey = keyof NonNullable<StepContentProps['classes']>;

export default function StepContent(props: StepContentProps): React.JSX.Element;
```

### vendor/src/StepIcon/StepIcon.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { SvgIconOwnProps } from '../SvgIcon';

import { Theme } from '../styles';

import { InternalStandardProps as StandardProps } from '../internal';

import { StepIconClasses } from './stepIconClasses';

export interface StepIconProps
  // TODO v7: extend React.HTMLAttributes<SVGSVGElement> as svg is root component of StepIcon not div
  extends
    StandardProps<React.HTMLAttributes<HTMLDivElement>, 'color' | 'children'>,
    Omit<SvgIconOwnProps, 'children'> {
  /**
   * Whether this step is active.
   * @default false
   */
  active?: boolean | undefined;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<StepIconClasses> | undefined;
  /**
   * Mark the step as completed. Is passed to child components.
   * @default false
   */
  completed?: boolean | undefined;
  /**
   * If `true`, the step is marked as failed.
   * @default false
   */
  error?: boolean | undefined;
  /**
   * The label displayed in the step icon.
   */
  icon: React.ReactNode;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
}

export type StepIconClasskey = keyof NonNullable<StepIconProps['classes']>;

export default function StepIcon(props: StepIconProps): React.JSX.Element;
```

### vendor/src/StepLabel/StepLabel.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { Theme } from '../styles';

import { InternalStandardProps as StandardProps } from '../internal';

import { StepIconProps } from '../StepIcon';

import { StepLabelClasses } from './stepLabelClasses';

import { CreateSlotsAndSlotProps, SlotProps } from '../utils/types';

export interface StepLabelSlots {
  /**
   * The component that renders the root.
   * @default span
   */
  root: React.ElementType;
  /**
   * The component that renders the label.
   * @default span
   */
  label: React.ElementType;
  /**
   * The component to render in place of the [`StepIcon`](https://mui.com/material-ui/api/step-icon/).
   */
  stepIcon: React.ElementType;
}

export type StepLabelSlotsAndSlotProps = CreateSlotsAndSlotProps<
  StepLabelSlots,
  {
    /**
     * Props forwarded to the root slot.
     * By default, the available props are based on the span element.
     */
    root: SlotProps<'span', {}, StepLabelOwnerState>;
    /**
     * Props forwarded to the label slot.
     * By default, the available props are based on the span element.
     */
    label: SlotProps<'span', {}, StepLabelOwnerState>;
    /**
     * Props forwarded to the stepIcon slot.
     * By default, the available props are based on the div element.
     */
    stepIcon: SlotProps<React.ElementType<StepIconProps>, {}, StepLabelOwnerState>;
  }
>;

export interface StepLabelOwnerState extends StepLabelProps {}

export interface StepLabelProps
  extends StandardProps<React.HTMLAttributes<HTMLDivElement>>, StepLabelSlotsAndSlotProps {
  /**
   * In most cases will simply be a string containing a title for the label.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<StepLabelClasses> | undefined;
  /**
   * If `true`, the step is marked as failed.
   * @default false
   */
  error?: boolean | undefined;
  /**
   * Override the default label of the step icon.
   */
  icon?: React.ReactNode;
  /**
   * The optional node to display.
   */
  optional?: React.ReactNode;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
}

export type StepLabelClasskey = keyof NonNullable<StepLabelProps['classes']>;

declare const StepLabel: ((props: StepLabelProps) => React.JSX.Element) & {
  muiName: string;
};
```

### vendor/src/Stepper/Stepper.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { OverridableComponent, OverrideProps } from '../OverridableComponent';

import { Theme } from '../styles';

import { PaperProps } from '../Paper';

import { StepperClasses } from './stepperClasses';

export type Orientation = 'horizontal' | 'vertical';

export interface StepperOwnProps extends Pick<PaperProps, 'elevation' | 'square' | 'variant'> {
  /**
   * Set the active step (zero based index).
   * Set to -1 to disable all the steps.
   * @default 0
   */
  activeStep?: number | undefined;
  /**
   * If set to 'true' and orientation is horizontal,
   * then the step label will be positioned under the icon.
   * If set to 'true' and orientation is vertical,
   * it reverses the position of the label and content.
   * @default false
   */
  alternativeLabel?: boolean | undefined;
  /**
   * Two or more `<Step />` components.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<StepperClasses> | undefined;
  /**
   * An element to be placed between each step.
   * @default <StepConnector />
   */
  connector?: React.ReactElement<unknown, any> | null | undefined;
  /**
   * If set the `Stepper` will not assist in controlling steps for linear flow.
   * @default false
   */
  nonLinear?: boolean | undefined;
  /**
   * The component orientation (layout flow direction).
   * @default 'horizontal'
   */
  orientation?: Orientation | undefined;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
}

export interface StepperTypeMap<
  AdditionalProps = {},
  RootComponent extends React.ElementType = 'div',
> {
  props: AdditionalProps & StepperOwnProps;
  defaultComponent: RootComponent;
}

export type StepperProps<
  RootComponent extends React.ElementType = StepperTypeMap['defaultComponent'],
  AdditionalProps = { component?: React.ElementType | undefined },
> = OverrideProps<StepperTypeMap<AdditionalProps, RootComponent>, RootComponent> & {
  component?: React.ElementType | undefined;
};

export type StepperClasskey = keyof NonNullable<StepperProps['classes']>;

declare const Stepper: OverridableComponent<StepperTypeMap>;
```

## Post-install acceptance

Run strict types, production build and real interactions. Check keyboard labels/focus, disabled/error/read-only semantics where natively supported, both themes, narrow screens and reduced motion. Verify callbacks against the real host data; do not declare installation complete from copying a prompt. Initialization fixtures also require server HTML and warning-free hydration.

## Source and license

https://github.com/mui/material-ui/tree/809a7717b4c050ba3f69b75300689f07c050a16e

MIT · @mui/material@9.4.0. Vendor originals and license are preserved. Full original upstream prose remains in vendor/docs and is not represented as fully translated.

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