feat(Select): Convert Select component to CSS Modules behind feature flag

.changeset/modern-icons-clean.md

@@ -0,0 +1,5 @@
+---
+'@primer/react': minor
+---
+
+Migrate `Select` component to css modules

packages/react/src/FormControl/FormControl.tsx

@@ -3,7 +3,7 @@ import Autocomplete from '../Autocomplete'
 import Box from '../Box'
 import Checkbox from '../Checkbox'
 import Radio from '../Radio'
-import Select from '../Select'
+import Select from '../Select/Select'
 import {SelectPanel} from '../SelectPanel'
 import TextInput from '../TextInput'
 import TextInputWithTokens from '../TextInputWithTokens'

packages/react/src/Select/Select.dev.stories.tsx

@@ -0,0 +1,25 @@
+import React from 'react'
+import type {Meta} from '@storybook/react'
+import {FormControl, Box} from '..'
+import Select from './Select'
+
+export default {
+  title: 'Components/Select/Dev',
+  component: Select,
+} as Meta
+
+export const Default = () => (
+  <Box as="form">
+    <FormControl>
+      <FormControl.Label>Default label</FormControl.Label>
+      <Select sx={{color: 'danger.fg'}}>
+        <Select.Option value="one">Choice one</Select.Option>
+        <Select.Option value="two">Choice two</Select.Option>
+        <Select.Option value="three">Choice three</Select.Option>
+        <Select.Option value="four">Choice four</Select.Option>
+        <Select.Option value="five">Choice five</Select.Option>
+        <Select.Option value="six">Choice six</Select.Option>
+      </Select>
+    </FormControl>
+  </Box>
+)

packages/react/src/Select/Select.features.stories.tsx

@@ -1,5 +1,6 @@
 import React from 'react'
-import {Select, FormControl, Box, Heading} from '..'
+import {FormControl, Box, Heading} from '..'
+import Select from './Select'
 
 export default {
   title: 'Components/Select/Features',

packages/react/src/Select/Select.figma.tsx

@@ -1,5 +1,5 @@
 import React from 'react'
-import {Select} from '../../src'
+import Select from '.'
 import FormControl from '../FormControl'
 import figma from '@figma/code-connect'
 

packages/react/src/Select/Select.module.css

@@ -0,0 +1,67 @@
+.Select {
+  width: 100%;
+  /* stylelint-disable-next-line primer/spacing */
+  margin-top: 1px;
+  /* stylelint-disable-next-line primer/spacing */
+  margin-bottom: 1px;
+  /* stylelint-disable-next-line primer/spacing */
+  margin-left: 1px;
+  font-size: inherit;
+  color: currentColor;
+
+  /* Firefox hacks:
+   * 1. Makes Firefox's native dropdown menu's background match the theme.
+   *    background-color should be 'transparent', but Firefox uses the background-color on
+   *    <select> to determine the background color used for the dropdown menu.
+   * 2. Adds 1px margins to the <select> so the background color doesn't hide the focus outline created with an inset box-shadow.
+   */
+  background-color: inherit;
+  border: 0;
+  border-radius: inherit;
+  outline: none;
+  appearance: none;
+
+  /* 2. Prevents visible overlap of partially transparent background colors.
+   *    'colors.input.disabledBg' happens to be partially transparent in light mode, so we use a
+   *    transparent background-color on a disabled <select>. 
+   */
+  &:disabled {
+    background-color: transparent;
+  }
+
+  /* 3. Maintain dark bg color in Firefox on Windows high-contrast mode
+   *    Firefox makes the <select>'s background color white when setting 'background-color: transparent;'   
+   */
+  @media screen and (forced-colors: active) {
+    &:disabled {
+      background-color: -moz-combobox;
+    }
+  }
+}
+
+.TextInputWrapper {
+  position: relative;
+  overflow: hidden;
+
+  @media screen and (forced-colors: active) {
+    svg {
+      fill: 'FieldText';
+    }
+  }
+}
+
+.disabled {
+  @media screen and (forced-colors: active) {
+    svg {
+      fill: 'GrayText';
+    }
+  }
+}
+
+.ArrowIndicator {
+  position: absolute;
+  top: 50%;
+  right: var(--base-size-4);
+  pointer-events: none;
+  transform: translateY(-50%);
+}

packages/react/src/Select/Select.stories.tsx

@@ -1,7 +1,8 @@
 import React from 'react'
 import type {Meta} from '@storybook/react'
-import {Select, FormControl, Box} from '..'
-import type {SelectProps} from '../Select'
+import {FormControl, Box} from '..'
+import Select from './Select'
+import type {SelectProps} from './Select'
 import type {FormControlArgs} from '../utils/form-story-helpers'
 import {
   formControlArgs,

packages/react/src/Select/Select.tsx

@@ -1,7 +1,11 @@
 import React from 'react'
 import styled from 'styled-components'
+import {clsx} from 'clsx'
 import type {StyledWrapperProps} from '../internal/components/TextInputWrapper'
 import TextInputWrapper from '../internal/components/TextInputWrapper'
+import {toggleStyledComponent} from '../internal/utils/toggleStyledComponent'
+import {useFeatureFlag} from '../FeatureFlags'
+import classes from './Select.module.css'
 
 export type SelectProps = Omit<
   Omit<React.ComponentPropsWithoutRef<'select'>, 'size'> & Omit<StyledWrapperProps, 'variant'>,
@@ -10,106 +14,159 @@ export type SelectProps = Omit<
   placeholder?: string
 }
 
-const arrowRightOffset = '4px'
+const CSS_MODULES_FEATURE_FLAG = 'primer_react_css_modules_team'
 
-const StyledSelect = styled.select`
-  appearance: none;
-  border-radius: inherit;
-  border: 0;
-  color: currentColor;
-  font-size: inherit;
-  outline: none;
-  width: 100%;
+const arrowRightOffset = '4px'
 
-  /* Firefox hacks: */
-  /* 1. Makes Firefox's native dropdown menu's background match the theme.
+const StyledSelect = toggleStyledComponent(
+  CSS_MODULES_FEATURE_FLAG,
+  'select',
+  styled.select`
+    appearance: none;
+    border-radius: inherit;
+    border: 0;
+    color: currentColor;
+    font-size: inherit;
+    outline: none;
+    width: 100%;
+
+    /* Firefox hacks: */
+    /* 1. Makes Firefox's native dropdown menu's background match the theme.
 
         background-color should be 'transparent', but Firefox uses the background-color on
         <select> to determine the background color used for the dropdown menu.
 
      2. Adds 1px margins to the <select> so the background color doesn't hide the focus outline created with an inset box-shadow.
   */
-  background-color: inherit;
-  margin-top: 1px;
-  margin-left: 1px;
-  margin-bottom: 1px;
+    background-color: inherit;
+    margin-top: 1px;
+    margin-left: 1px;
+    margin-bottom: 1px;
 
-  /* 2. Prevents visible overlap of partially transparent background colors.
+    /* 2. Prevents visible overlap of partially transparent background colors.
 
      'colors.input.disabledBg' happens to be partially transparent in light mode, so we use a
      transparent background-color on a disabled <select>. */
-  &:disabled {
-    background-color: transparent;
-  }
+    &:disabled {
+      background-color: transparent;
+    }
 
-  /* 3. Maintain dark bg color in Firefox on Windows high-contrast mode
+    /* 3. Maintain dark bg color in Firefox on Windows high-contrast mode
 
      Firefox makes the <select>'s background color white when setting 'background-color: transparent;' */
-  @media screen and (forced-colors: active) {
-    &:disabled {
-      background-color: -moz-combobox;
+    @media screen and (forced-colors: active) {
+      &:disabled {
+        background-color: -moz-combobox;
+      }
     }
-  }
-`
-
-const ArrowIndicatorSVG: React.FC<React.PropsWithChildren<{className?: string}>> = ({className}) => (
-  <svg
-    aria-hidden="true"
-    width="16"
-    height="16"
-    fill="currentColor"
-    xmlns="http://www.w3.org/2000/svg"
-    className={className}
-  >
-    <path d="m4.074 9.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.043 9H4.251a.25.25 0 0 0-.177.427ZM4.074 7.47 7.47 4.073a.25.25 0 0 1 .354 0L11.22 7.47a.25.25 0 0 1-.177.426H4.251a.25.25 0 0 1-.177-.426Z" />
-  </svg>
+  `,
 )
 
-const ArrowIndicator = styled(ArrowIndicatorSVG)`
+const ArrowIndicatorSVG: React.FC<React.PropsWithChildren<{className?: string}>> = ({className}) => {
+  return (
+    <svg
+      aria-hidden="true"
+      width="16"
+      height="16"
+      fill="currentColor"
+      xmlns="http://www.w3.org/2000/svg"
+      className={className}
+    >
+      <path d="m4.074 9.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.043 9H4.251a.25.25 0 0 0-.177.427ZM4.074 7.47 7.47 4.073a.25.25 0 0 1 .354 0L11.22 7.47a.25.25 0 0 1-.177.426H4.251a.25.25 0 0 1-.177-.426Z" />
+    </svg>
+  )
+}
+
+const StyledArrowIndicatorSVG = styled(ArrowIndicatorSVG)`
   pointer-events: none;
   position: absolute;
   right: ${arrowRightOffset};
   top: 50%;
   transform: translateY(-50%);
 `
 
+const ArrowIndicator: React.FC<{className?: string}> = ({className}) => {
+  const enabled = useFeatureFlag(CSS_MODULES_FEATURE_FLAG)
+  if (enabled) {
+    return <ArrowIndicatorSVG className={clsx(classes.ArrowIndicator, className)} />
+  }
+
+  return <StyledArrowIndicatorSVG />
+}
+
 const Select = React.forwardRef<HTMLSelectElement, SelectProps>(
-  ({block, children, contrast, disabled, placeholder, size, required, validationStatus, ...rest}: SelectProps, ref) => (
-    <TextInputWrapper
-      sx={{
-        overflow: 'hidden',
-        position: 'relative',
-        '@media screen and (forced-colors: active)': {
-          svg: {
-            fill: disabled ? 'GrayText' : 'FieldText',
+  ({block, children, contrast, disabled, placeholder, size, required, validationStatus, ...rest}: SelectProps, ref) => {
+    const enabled = useFeatureFlag(CSS_MODULES_FEATURE_FLAG)
+    if (enabled) {
+      return (
+        <TextInputWrapper
+          block={block}
+          contrast={contrast}
+          disabled={disabled}
+          size={size}
+          validationStatus={validationStatus}
+          className={classes.TextInputWrapper}
+          sx={rest.sx}
+        >
+          <StyledSelect
+            ref={ref}
+            required={required}
+            disabled={disabled}
+            aria-invalid={validationStatus === 'error' ? 'true' : 'false'}
+            data-hasplaceholder={Boolean(placeholder)}
+            defaultValue={placeholder ?? undefined}
+            className={clsx(classes.Select, disabled && classes.Disabled)}
+            {...rest}
+          >
+            {placeholder && (
+              <option value="" disabled={required} hidden={required}>
+                {placeholder}
+              </option>
+            )}
+            {children}
+          </StyledSelect>
+          <ArrowIndicator className={classes.ArrowIndicator} />
+        </TextInputWrapper>
+      )
+    }
+
+    return (
+      <TextInputWrapper
+        sx={{
+          overflow: 'hidden',
+          position: 'relative',
+          '@media screen and (forced-colors: active)': {
+            svg: {
+              fill: disabled ? 'GrayText' : 'FieldText',
+            },
           },
-        },
-      }}
-      block={block}
-      contrast={contrast}
-      disabled={disabled}
-      size={size}
-      validationStatus={validationStatus}
-    >
-      <StyledSelect
-        ref={ref}
-        required={required}
+        }}
+        block={block}
+        contrast={contrast}
         disabled={disabled}
-        aria-invalid={validationStatus === 'error' ? 'true' : 'false'}
-        data-hasplaceholder={Boolean(placeholder)}
-        defaultValue={placeholder ?? undefined}
-        {...rest}
+        size={size}
+        validationStatus={validationStatus}
       >
-        {placeholder && (
-          <option value="" disabled={required} hidden={required}>
-            {placeholder}
-          </option>
-        )}
-        {children}
-      </StyledSelect>
-      <ArrowIndicator />
-    </TextInputWrapper>
-  ),
+        <StyledSelect
+          ref={ref}
+          required={required}
+          disabled={disabled}
+          aria-invalid={validationStatus === 'error' ? 'true' : 'false'}
+          data-hasplaceholder={Boolean(placeholder)}
+          defaultValue={placeholder ?? undefined}
+          {...rest}
+        >
+          {placeholder && (
+            <option value="" disabled={required} hidden={required}>
+              {placeholder}
+            </option>
+          )}
+          {children}
+        </StyledSelect>
+        <ArrowIndicator />
+      </TextInputWrapper>
+    )
+  },
 )
 
 const Option: React.FC<React.PropsWithChildren<React.HTMLProps<HTMLOptionElement> & {value: string}>> = props => (

packages/react/src/index.ts

@@ -137,8 +137,9 @@ export {default as RadioGroup} from './RadioGroup'
 export type {RelativeTimeProps} from './RelativeTime'
 export {default as RelativeTime} from './RelativeTime'
 export {SegmentedControl} from './SegmentedControl'
-export {default as Select} from './Select'
-export type {SelectProps} from './Select'
+// Curently there is a duplicate Select component at the root of the dir, so need to be explicit about exporting from the src/Select dir
+export {default as Select} from './Select/Select'
+export type {SelectProps} from './Select/Select'
 export {SelectPanel} from './SelectPanel'
 export type {SelectPanelProps} from './SelectPanel'
 export {default as SideNav} from './SideNav'