refactor(Table): update to CSS Modules

.changeset/selfish-flowers-approve.md

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+---
+"@primer/react": minor
+---
+
+Update Table to use CSS Modules behind feature flag

packages/react/src/DataTable/Table.module.css

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+/* Container ---------------------------------------------------------------- */
+.TableContainer {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  grid-template-areas:
+    'title actions'
+    'divider divider'
+    'subtitle subtitle'
+    'filter filter'
+    'table table'
+    'footer footer';
+  column-gap: var(--base-size-8);
+}
+
+/* TableTitle */
+.TableTitle {
+  margin: 0;
+  font-size: var(--text-body-size-small);
+  font-weight: var(--base-text-weight-semibold);
+  /* stylelint-disable-next-line primer/typography */
+  line-height: calc(20 / 14);
+  color: var(--fgColor-default);
+  grid-area: title;
+  align-self: center;
+}
+
+/* TableSubtitle */
+.TableSubtitle {
+  margin: 0;
+  font-size: var(--text-body-size-small);
+  font-weight: var(--base-text-weight-normal);
+  line-height: var(--text-body-lineHeight-small);
+  color: var(--fgColor-default);
+  grid-area: subtitle;
+}
+
+/* TableActions */
+.TableActions {
+  display: flex;
+  column-gap: var(--base-size-8);
+  align-items: center;
+  grid-area: actions;
+  justify-self: end;
+}
+
+/* TableDivider */
+.TableDivider {
+  width: 100%;
+  height: 1px;
+  /* stylelint-disable-next-line primer/colors */
+  background-color: var(--borderColor-default);
+  grid-area: divider;
+  margin-block-start: var(--base-size-16);
+  margin-block-end: var(--base-size-8);
+}
+
+/* Spacing before the table */
+.TableTitle + .TableOverflowWrapper,
+.TableSubtitle + .TableOverflowWrapper,
+.TableActions + .TableOverflowWrapper {
+  margin-block-start: var(--base-size-8);
+}
+
+.TableOverflowWrapper {
+  grid-area: table;
+}
+
+/* Table -------------------------------------------------------------------- */
+.Table {
+  /* Default table styles */
+  --table-border-radius: 0.375rem;
+  --table-cell-padding: var(--cell-padding-block, 0.5rem) var(--cell-padding-inline, 0.75rem);
+  --table-font-size: 0.75rem;
+
+  display: grid;
+  width: 100%;
+  /* stylelint-disable-next-line primer/typography */
+  font-size: var(--table-font-size);
+  /* stylelint-disable-next-line primer/typography */
+  line-height: calc(20 / 12);
+  border-spacing: 0;
+  /* stylelint-disable-next-line primer/borders */
+  border-collapse: separate;
+  background-color: var(--bgColor-default);
+  grid-area: table;
+  grid-template-columns: var(--grid-template-columns);
+
+  /* Density modes: condensed, normal, spacious */
+  &:where([data-cell-padding='condensed']) {
+    --cell-padding-block: 0.25rem;
+    --cell-padding-inline: 0.5rem;
+  }
+
+  &:where([data-cell-padding='normal']) {
+    --cell-padding-block: 0.5rem;
+    --cell-padding-inline: 0.75rem;
+  }
+
+  &:where([data-cell-padding='spacious']) {
+    --cell-padding-block: 0.75rem;
+    --cell-padding-inline: 1rem;
+  }
+}
+
+/* Borders */
+.TableCell:first-child,
+.TableHeader:first-child {
+  border-inline-start: var(--borderWidth-thin) solid var(--borderColor-default);
+}
+
+.TableCell:last-child,
+.TableHeader:last-child {
+  border-inline-end: var(--borderWidth-thin) solid var(--borderColor-default);
+}
+
+.TableHeader,
+.TableCell {
+  display: flex;
+  /* stylelint-disable-next-line primer/spacing */
+  padding: var(--table-cell-padding);
+  text-align: start;
+  align-items: center;
+  border-block-end: var(--borderWidth-thin) solid var(--borderColor-default);
+}
+
+.TableHeader:where([data-cell-align='end']),
+.TableCell:where([data-cell-align='end']) {
+  display: flex;
+  text-align: end;
+  justify-content: flex-end;
+}
+
+.TableHeader[data-cell-align='end'] .TableSortButton {
+  display: flex;
+  flex-direction: row-reverse;
+}
+
+.TableHead .TableRow:first-of-type .TableHeader {
+  border-block-start: var(--borderWidth-thin) solid var(--borderColor-default);
+}
+
+/* Border radius */
+/* stylelint-disable-next-line selector-max-specificity */
+.TableHead .TableRow:first-of-type .TableHeader:first-child {
+  /* stylelint-disable-next-line primer/borders */
+  border-top-left-radius: var(--table-border-radius);
+}
+
+/* stylelint-disable-next-line selector-max-specificity */
+.TableHead .TableRow:first-of-type .TableHeader:last-child {
+  /* stylelint-disable-next-line primer/borders */
+  border-top-right-radius: var(--table-border-radius);
+}
+
+/* stylelint-disable-next-line selector-max-compound-selectors,selector-max-specificity */
+.TableOverflowWrapper:last-child .Table .TableBody .TableRow:last-of-type .TableCell:first-child {
+  /* stylelint-disable-next-line primer/borders */
+  border-bottom-left-radius: var(--table-border-radius);
+}
+
+/* stylelint-disable-next-line selector-max-compound-selectors,selector-max-specificity */
+.TableOverflowWrapper:last-child .Table .TableBody .TableRow:last-of-type .TableCell:last-child {
+  /* stylelint-disable-next-line primer/borders */
+  border-bottom-right-radius: var(--table-border-radius);
+}
+
+/**
+ * Offset padding to make sure type aligns regardless of cell padding
+ * selection
+ */
+.TableRow > *:first-child:not(.TableCellSkeleton),
+.TableRow > *:first-child .TableCellSkeletonItem {
+  padding-inline-start: var(--base-size-16);
+}
+
+.TableRow > *:last-child:not(.TableCellSkeleton),
+.TableRow > *:last-child .TableCellSkeletonItem {
+  padding-inline-end: var(--base-size-16);
+}
+
+/* TableHeader */
+.TableHeader {
+  font-weight: var(--base-text-weight-semibold);
+  color: var(--fgColor-muted);
+  background-color: var(--bgColor-muted);
+  border-block-start: var(--borderWidth-thin) solid var(--borderColor-default);
+}
+
+.TableHeader:where([aria-sort='descending']),
+.TableHeader:where([aria-sort='ascending']) {
+  color: var(--fgColor-default);
+}
+
+/* Control visibility of sort icons */
+.TableSortIcon {
+  visibility: hidden;
+}
+
+/* The ASC icon is visible if the header is sortable and is hovered or focused */
+.TableHeader:hover .TableSortIcon--ascending,
+.TableHeader .TableSortButton:focus .TableSortIcon--ascending {
+  visibility: visible;
+}
+
+/* Each sort icon is visible if the TableHeader is currently in the corresponding sort state */
+.TableHeader[aria-sort='ascending'] .TableSortIcon--ascending,
+.TableHeader[aria-sort='descending'] .TableSortIcon--descending {
+  visibility: visible;
+}
+
+/* TableRow */
+.TableRow:hover .TableCell:not(.TableCellSkeleton) {
+  background-color: var(--control-transparent-bgColor-hover);
+}
+
+/* TableCell */
+.TableCell:where([scope='row']) {
+  display: flex;
+  font-weight: var(--base-text-weight-semibold);
+  color: var(--fgColor-default);
+  align-items: center;
+}
+
+/* TableCellSkeleton */
+.TableCellSkeleton {
+  padding: 0;
+}
+
+.TableCellSkeletonItems {
+  display: flex;
+  width: 100%;
+  flex-direction: column;
+}
+
+.TableCellSkeletonItem {
+  /* stylelint-disable-next-line primer/spacing */
+  padding: var(--table-cell-padding);
+
+  &:nth-of-type(5n + 1) {
+    --skeleton-item-width: 85%;
+  }
+
+  &:nth-of-type(5n + 2) {
+    --skeleton-item-width: 67.5%;
+  }
+
+  &:nth-of-type(5n + 3) {
+    --skeleton-item-width: 80%;
+  }
+
+  &:nth-of-type(5n + 4) {
+    --skeleton-item-width: 60%;
+  }
+
+  &:nth-of-type(5n + 5) {
+    --skeleton-item-width: 75%;
+  }
+}
+
+.TableCellSkeletonItem [data-component='SkeletonText'] {
+  width: var(--skeleton-item-width);
+}
+
+.TableCellSkeletonItem:not(:last-of-type) {
+  border-block-end: var(--borderWidth-thin) solid var(--borderColor-default);
+}
+
+/* Grid layout */
+.TableHead,
+.TableBody,
+.TableRow {
+  display: contents;
+}
+
+@supports (grid-template-columns: subgrid) {
+  .TableHead,
+  .TableBody,
+  .TableRow {
+    display: grid;
+    grid-template-columns: subgrid;
+    grid-column: -1 /1;
+  }
+}