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MultiSelectUnstyled.js
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			import _extends from "@babel/runtime/helpers/esm/extends";
			import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
			const _excluded = ["autoFocus", "children", "component", "defaultListboxOpen", "defaultValue", "disabled", "getSerializedValue", "listboxId", "listboxOpen", "name", "onChange", "onListboxOpenChange", "optionStringifier", "renderValue", "slotProps", "slots", "value"];
			import * as React from 'react';
			import PropTypes from 'prop-types';
			import { unstable_useForkRef as useForkRef, unstable_useControlled as useControlled } from '@mui/utils';
			import { flattenOptionGroups, getOptionsFromChildren } from '../SelectUnstyled/utils';
			import useSelect from '../SelectUnstyled/useSelect';
			import { useSlotProps } from '../utils';
			import PopperUnstyled from '../PopperUnstyled';
			import { SelectUnstyledContext } from '../SelectUnstyled/SelectUnstyledContext';
			import composeClasses from '../composeClasses';
			import { getSelectUnstyledUtilityClass } from '../SelectUnstyled/selectUnstyledClasses';
			import defaultOptionStringifier from '../SelectUnstyled/defaultOptionStringifier';
			import { jsx as _jsx } from "react/jsx-runtime";
			import { jsxs as _jsxs } from "react/jsx-runtime";
			function defaultRenderMultipleValues(selectedOptions) {
			return /#__PURE__/_jsx(React.Fragment, {
			children: selectedOptions.map(o => o.label).join(', ')
			});
			}
			function defaultFormValueProvider(selectedOptions) {
			if (selectedOptions.length === 0) {
			return '';
			}
			if (selectedOptions.every(o => typeof o.value === 'string' \|\| typeof o.value === 'number' \|\| typeof o.value === 'boolean')) {
			return selectedOptions.map(o => String(o.value));
			}
			return JSON.stringify(selectedOptions.map(o => o.value));
			}
			function useUtilityClasses(ownerState) {
			const {
			active,
			disabled,
			open,
			focusVisible
			} = ownerState;
			const slots = {
			root: ['root', disabled && 'disabled', focusVisible && 'focusVisible', active && 'active', open && 'expanded'],
			listbox: ['listbox', disabled && 'disabled'],
			popper: ['popper']
			};
			return composeClasses(slots, getSelectUnstyledUtilityClass, {});
			}

			/**
			* The foundation for building custom-styled multi-selection select components.
			*
			* Demos:
			*
			* - [Unstyled Select](https://mui.com/base/react-select/)
			*
			* API:
			*
			* - [MultiSelectUnstyled API](https://mui.com/base/api/multi-select-unstyled/)
			*/
			const MultiSelectUnstyled = /#__PURE__/React.forwardRef(function MultiSelectUnstyled(props, forwardedRef) {
			const {
			autoFocus,
			children,
			component,
			defaultListboxOpen = false,
			defaultValue = [],
			disabled: disabledProp,
			getSerializedValue = defaultFormValueProvider,
			listboxId,
			listboxOpen: listboxOpenProp,
			name,
			onChange,
			onListboxOpenChange,
			optionStringifier = defaultOptionStringifier,
			renderValue: renderValueProp,
			slotProps = {},
			slots = {},
			value: valueProp
			} = props,
			other = _objectWithoutPropertiesLoose(props, _excluded);
			const renderValue = renderValueProp ?? defaultRenderMultipleValues;
			const [groupedOptions, setGroupedOptions] = React.useState([]);
			const options = React.useMemo(() => flattenOptionGroups(groupedOptions), [groupedOptions]);
			const [listboxOpen, setListboxOpen] = useControlled({
			controlled: listboxOpenProp,
			default: defaultListboxOpen,
			name: 'MultiSelectUnstyled',
			state: 'listboxOpen'
			});
			React.useEffect(() => {
			setGroupedOptions(getOptionsFromChildren(children));
			}, [children]);
			const [buttonDefined, setButtonDefined] = React.useState(false);
			const buttonRef = React.useRef(null);
			const listboxRef = React.useRef(null);
			const Button = component ?? slots.root ?? 'button';
			const ListboxRoot = slots.listbox ?? 'ul';
			const Popper = slots.popper ?? PopperUnstyled;
			const handleButtonRefChange = React.useCallback(element => {
			setButtonDefined(element != null);
			}, []);
			const handleButtonRef = useForkRef(forwardedRef, buttonRef, handleButtonRefChange);
			React.useEffect(() => {
			if (autoFocus) {
			buttonRef.current.focus();
			}
			}, [autoFocus]);
			const handleOpenChange = isOpen => {
			setListboxOpen(isOpen);
			onListboxOpenChange?.(isOpen);
			};
			const {
			buttonActive,
			buttonFocusVisible,
			disabled,
			getButtonProps,
			getListboxProps,
			getOptionProps,
			getOptionState,
			value
			} = useSelect({
			buttonRef: handleButtonRef,
			defaultValue,
			disabled: disabledProp,
			listboxId,
			multiple: true,
			onChange,
			onOpenChange: handleOpenChange,
			open: listboxOpen,
			options,
			optionStringifier,
			value: valueProp
			});
			const ownerState = _extends({}, props, {
			active: buttonActive,
			defaultListboxOpen,
			disabled,
			focusVisible: buttonFocusVisible,
			open: listboxOpen,
			renderValue,
			value
			});
			const classes = useUtilityClasses(ownerState);
			const selectedOptions = React.useMemo(() => {
			if (value == null) {
			return [];
			}
			return options.filter(o => value.includes(o.value));
			}, [options, value]);
			const buttonProps = useSlotProps({
			elementType: Button,
			getSlotProps: getButtonProps,
			externalSlotProps: slotProps.root,
			externalForwardedProps: other,
			ownerState,
			className: classes.root
			});
			const listboxProps = useSlotProps({
			elementType: ListboxRoot,
			getSlotProps: getListboxProps,
			externalSlotProps: slotProps.listbox,
			additionalProps: {
			ref: listboxRef
			},
			ownerState,
			className: classes.listbox
			});
			const popperProps = useSlotProps({
			elementType: Popper,
			externalSlotProps: slotProps.popper,
			additionalProps: {
			anchorEl: buttonRef.current,
			disablePortal: true,
			open: listboxOpen,
			placement: 'bottom-start',
			role: undefined
			},
			ownerState,
			className: classes.popper
			});
			const context = React.useMemo(() => ({
			getOptionProps,
			getOptionState,
			listboxRef
			}), [getOptionProps, getOptionState]);
			return /#__PURE__/_jsxs(React.Fragment, {
			children: [/#__PURE__/_jsx(Button, _extends({}, buttonProps, {
			children: renderValue(selectedOptions)
			})), buttonDefined && /#__PURE__/_jsx(Popper, _extends({}, popperProps, {
			children: /#__PURE__/_jsx(ListboxRoot, _extends({}, listboxProps, {
			children: /#__PURE__/_jsx(SelectUnstyledContext.Provider, {
			value: context,
			children: children
			})
			}))
			})), name && /#__PURE__/_jsx("input", {
			type: "hidden",
			name: name,
			value: getSerializedValue(selectedOptions)
			})]
			});
			});
			process.env.NODE_ENV !== "production" ? MultiSelectUnstyled.propTypes /* remove-proptypes */ = {
			// ----------------------------- Warning --------------------------------
			// \| These PropTypes are generated from the TypeScript type definitions \|
			// \| To update them edit TypeScript types and run "yarn proptypes" \|
			// ----------------------------------------------------------------------
			/**
			* If `true`, the select element is focused during the first mount
			* @default false
			*/
			autoFocus: PropTypes.bool,
			/**
			* @ignore
			*/
			children: PropTypes.node,
			/**
			* The component used for the root node.
			* Either a string to use a HTML element or a component.
			*/
			component: PropTypes.elementType,
			/**
			* If `true`, the select will be initially open.
			* @default false
			*/
			defaultListboxOpen: PropTypes.bool,
			/**
			* The default selected values. Use when the component is not controlled.
			* @default []
			*/
			defaultValue: PropTypes.array,
			/**
			* If `true`, the select is disabled.
			* @default false
			*/
			disabled: PropTypes.bool,
			/**
			* A function to convert the currently selected values to a type accepted by HTML input.
			* Used to set a value of a hidden input associated with the select,
			* so that the selected values can be posted with a form.
			*/
			getSerializedValue: PropTypes.func,
			/**
			* `id` attribute of the listbox element.
			* Also used to derive the `id` attributes of options.
			*/
			listboxId: PropTypes.string,
			/**
			* Controls the open state of the select's listbox.
			* @default undefined
			*/
			listboxOpen: PropTypes.bool,
			/**
			* Name of the element. For example used by the server to identify the fields in form submits.
			* If the name is provided, the component will render a hidden input element that can be submitted to a server.
			*/
			name: PropTypes.string,
			/**
			* Callback fired when an option is selected.
			*/
			onChange: PropTypes.func,
			/**
			* Callback fired when the component requests to be opened.
			* Use in controlled mode (see listboxOpen).
			*/
			onListboxOpenChange: PropTypes.func,
			/**
			* A function used to convert the option label to a string.
			* It's useful when labels are elements and need to be converted to plain text
			* to enable navigation using character keys on a keyboard.
			*
			* @default defaultOptionStringifier
			*/
			optionStringifier: PropTypes.func,
			/**
			* Function that customizes the rendering of the selected values.
			*/
			renderValue: PropTypes.func,
			/**
			* The props used for each slot inside the MultiSelect.
			* @default {}
			*/
			slotProps: PropTypes.shape({
			listbox: PropTypes.oneOfType([PropTypes.func, PropTypes.object]),
			popper: PropTypes.oneOfType([PropTypes.func, PropTypes.object]),
			root: PropTypes.oneOfType([PropTypes.func, PropTypes.object])
			}),
			/**
			* The components used for each slot inside the MultiSelect.
			* Either a string to use a HTML element or a component.
			* @default {}
			*/
			slots: PropTypes /* @typescript-to-proptypes-ignore */.shape({
			listbox: PropTypes.elementType,
			popper: PropTypes.elementType,
			root: PropTypes.elementType
			}),
			/**
			* The selected values.
			* Set to an empty array to deselect all options.
			*/
			value: PropTypes.array
			} : void 0;
			export default MultiSelectUnstyled;