feat: add multiselect component

src/components/MultiSelect/FadeInDown/FadeInDown.scss

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+@import "vanilla-framework";
+
+.fade-in--down {
+  @include vf-transition(#{transform, opacity, visibility}, fast);
+
+  position: relative;
+  z-index: 1;
+
+  &[aria-hidden="true"] {
+    height: 0;
+    opacity: 0;
+    transform: translate3d(0, -0.5rem, 0);
+    visibility: hidden;
+  }
+
+  &[aria-hidden="false"] {
+    height: auto;
+    opacity: 1;
+    transform: translate3d(0, 0, 0);
+    visibility: visible;
+  }
+}

src/components/MultiSelect/FadeInDown/FadeInDown.test.tsx

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+import React from "react";
+import { render, screen } from "@testing-library/react";
+
+import { FadeInDown } from "./FadeInDown";
+
+it("renders with correct attributes", () => {
+  render(
+    <FadeInDown className="test-class" isVisible>
+      <div>Content</div>
+    </FadeInDown>
+  );
+
+  // eslint-disable-next-line testing-library/no-node-access
+  const element = screen.getByText("Content").parentElement;
+  expect(element).toHaveAttribute("aria-hidden", "false");
+  expect(element).toHaveClass("fade-in--down test-class");
+});
+
+it("hides and reveals children", () => {
+  const { rerender } = render(
+    <FadeInDown isVisible>
+      <div>Content</div>
+    </FadeInDown>
+  );
+  expect(screen.getByText("Content")).toBeInTheDocument();
+
+  rerender(
+    <FadeInDown className="test-class" isVisible={false}>
+      <div>Test child</div>
+    </FadeInDown>
+  );
+
+  expect(screen.queryByText("Content")).not.toBeInTheDocument();
+});

src/components/MultiSelect/FadeInDown/FadeInDown.tsx

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+import React, { FC, PropsWithChildren } from "react";
+
+import classNames from "classnames";
+import "./FadeInDown.scss";
+
+export interface FadeInDownProps extends PropsWithChildren {
+  isVisible: boolean;
+  className?: string;
+}
+
+/**
+ * EXPERIMENTAL: This component is experimental and should be used internally only.
+ */
+export const FadeInDown: FC<FadeInDownProps> = ({
+  children,
+  className,
+  isVisible,
+}) => {
+  return (
+    <div
+      className={classNames("fade-in--down", className)}
+      aria-hidden={isVisible ? "false" : "true"}
+      style={{ visibility: isVisible ? "visible" : "hidden" }}
+    >
+      {children}
+    </div>
+  );
+};

src/components/MultiSelect/FadeInDown/index.ts

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+export * from "./FadeInDown";

src/components/MultiSelect/MultiSelect.scss

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+@use "sass:map";
+@import "vanilla-framework";
+@include vf-base;
+@include vf-p-lists;
+
+$dropdown-max-height: 20rem;
+
+.multi-select {
+  position: relative;
+}
+
+.multi-select .p-form-validation__message {
+  margin-top: 0;
+}
+
+.multi-select__condensed-text {
+  margin-right: $sph--large + $sph--x-small;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.multi-select__input {
+  cursor: pointer;
+  position: relative;
+
+  &.items-selected {
+    border-top: 0;
+    box-shadow: none;
+    top: -#{$border-radius};
+  }
+
+  &[disabled],
+  &[disabled="disabled"] {
+    opacity: 1;
+  }
+}
+
+.multi-select__dropdown {
+  @extend %vf-bg--x-light;
+  @extend %vf-has-box-shadow;
+  left: 0;
+  max-height: $dropdown-max-height;
+  overflow: auto;
+
+  padding-top: $spv--small;
+  position: absolute;
+  right: 0;
+  top: calc(100% - #{$input-margin-bottom});
+}
+
+.multi-select__dropdown--side-by-side {
+  display: flex;
+  flex-wrap: wrap;
+}
+
+.multi-select__group {
+  flex: 1 0 auto;
+}
+
+.multi-select__dropdown-list {
+  @extend %vf-list;
+
+  margin-bottom: $sph--x-small;
+}
+
+.multi-select__footer {
+  background: white;
+  border-top: 1px solid $color-mid-light;
+  bottom: 0;
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  padding: $sph--small $sph--large 0 $sph--large;
+  position: sticky;
+}
+
+.multi-select__dropdown-header {
+  font-size: #{map.get($font-sizes, small)}rem;
+  letter-spacing: #{map.get($font-sizes, small)}px;
+  margin-bottom: 0;
+  padding: $spv--x-small $sph--large;
+  position: relative;
+  text-transform: uppercase;
+}
+
+.multi-select__dropdown-item {
+  padding: 0 $sph--large;
+
+  .p-checkbox {
+    padding-top: $sph--x-small;
+  }
+
+  &,
+  .p-checkbox {
+    width: 100%;
+  }
+}
+
+.multi-select__dropdown-item-description {
+  @extend %small-text;
+
+  color: $color-mid-dark;
+}
+
+.multi-select__dropdown-button {
+  border: 0;
+  margin-bottom: 0;
+  padding-left: $sph--small;
+  padding-right: $sph--small;
+  text-align: left;
+  width: 100%;
+}
+
+.multi-select__selected-list {
+  background-color: $colors--light-theme--background-inputs;
+  border-bottom: 0;
+  margin: 0;
+  overflow: hidden;
+  padding: $spv--x-small $sph--small;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.multi-select__select-button {
+  @extend %vf-input-elements;
+  align-items: center;
+  display: inline-flex;
+  height: 2.5rem;
+  justify-content: space-between;
+  overflow: auto;
+
+  position: relative;
+  z-index: 0;
+
+  &::after {
+    content: "";
+    margin-left: $sph--large;
+    position: absolute;
+    right: $sph--small;
+    top: 50%;
+    transform: translateY(-50%) rotate(-180deg);
+
+    @extend %icon;
+    @include vf-icon-chevron($color-mid-dark);
+    @include vf-transition($property: transform, $duration: fast);
+  }
+
+  &[aria-expanded="true"] {
+    background-color: $colors--light-theme--background-hover;
+  }
+
+  &[aria-expanded="false"] {
+    &::after {
+      transform: translateY(-50%) rotate(0);
+    }
+  }
+}

src/components/MultiSelect/MultiSelect.stories.tsx

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+import React from "react";
+import { useState } from "react";
+
+import { Meta } from "@storybook/react";
+
+import { MultiSelect, MultiSelectItem, MultiSelectProps } from "./MultiSelect";
+
+const Template = (props: MultiSelectProps) => {
+  const [selectedItems, setSelectedItems] = useState<MultiSelectItem[]>(
+    props.selectedItems || []
+  );
+  return (
+    <MultiSelect
+      {...props}
+      selectedItems={selectedItems}
+      onItemsUpdate={setSelectedItems}
+    />
+  );
+};
+
+const meta: Meta<typeof MultiSelect> = {
+  title: "MultiSelect",
+  component: MultiSelect,
+  render: Template,
+  tags: ["autodocs"],
+  parameters: {},
+};
+
+export default meta;
+
+export const CondensedExample = {
+  args: {
+    items: [
+      ...Array.from({ length: 26 }, (_, i) => ({
+        label: `${String.fromCharCode(i + 65)}`,
+        value: `${String.fromCharCode(i + 65)}`,
+      })),
+      ...Array.from({ length: 26 }, (_, i) => ({
+        label: `Item ${i + 1}`,
+        value: i + 1,
+      })),
+    ],
+    selectedItems: [
+      { label: "A", value: "A" },
+      { label: "Item 2", value: 2 },
+    ],
+    variant: "condensed",
+  },
+};
+
+export const SearchExample = {
+  args: {
+    ...CondensedExample.args,
+    variant: "search",
+    items: [
+      ...CondensedExample.args.items.map((item, i) => ({
+        ...item,
+        group: i % 2 === 0 ? "Group 1" : "Group 2",
+      })),
+    ],
+  },
+};
+
+export const WithDisabledItems = {
+  args: {
+    ...CondensedExample.args,
+    disabledItems: [
+      { label: "Item 1", value: 1 },
+      { label: "Item 2", value: 2 },
+    ],
+  },
+};