diff --git a/CLAUDE.md b/CLAUDE.md
index 80f1cbf821..55130dbcf9 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -480,6 +480,47 @@ Configuration in `.editorconfig`:
 - **Entry functions:** `{feature}Entries`
 - **Use cases:** `{Action}{Domain}UseCase` (e.g., `GetHomeDataUseCase`)
 
+### Imports
+
+**Import the type, never the namespace.** An import may shorten a qualified reference only when the
+short name still says what it is to someone reading that line cold, without scrolling to the import
+list. Sealed subclasses, enum entries and other types pass that test. A member reached through a
+receiver that carries the meaning does not.
+
+Always allowed (this is the house style, ~1200 such imports exist):
+
+```kotlin
+import com.hedvig.android.feature.home.home.ui.HomeUiState.Success   // `is Success ->` reads fine
+import com.hedvig.android.design.system.hedvig.TooltipDefaults.BeakDirection.TopEnd
+import kotlin.time.Duration.Companion.seconds                        // enables the `5.seconds` idiom
+```
+
+Never allowed, because the receiver is the meaning:
+
+```kotlin
+import hedvig.resources.Res.string      // ❌ `stringResource(string.FOO)`  → use `Res.string.FOO`
+import hedvig.resources.Res.drawable    // ❌ `painterResource(drawable.x)` → use `Res.drawable.x`
+import kotlin.time.Clock.System         // ❌ `System.now()`               → use `Clock.System.now()`
+import ...hedvig.TooltipDefaults.defaultStyle  // ❌ `defaultStyle` alone names nothing
+```
+
+`Res` and `Clock` are the two that come up most: 193 files import `hedvig.resources.Res` plainly and
+that is the standard. `System.now()` additionally reads as `java.lang.System` to anyone skimming.
+
+**Separately: never make an import-only change to a line you are not otherwise editing.** Converting
+existing `HomeEvent.RefreshData` call sites to a bare `RefreshData` (or the reverse) is a whole-file
+rewrite disguised as a diff. It buries the real change under churn and makes review and `git blame`
+worse for no behavioural gain.
+
+**Why:** both halves of this rule protect the reader. The first protects whoever reads the line
+later, the second protects whoever reviews the PR now. PR #3100 was one screen refactor carrying 29
+gratuitous new imports and ~60 rewritten call sites, and the formatting noise overshadowed the
+actual work.
+
+**How to apply:** if you are touching a line for a real reason, use the correct form. If you are not
+touching it, leave its qualification exactly as it is. Import cleanups that are genuinely wanted go
+in their own commit.
+
 ### Comments
 
 Code comments and KDoc must describe the **current** code and stand on their own. A comment fails to earn its place in two ways: it tells the wrong kind of story, or it repeats what is already there. Before writing one, apply the test: *would this make sense to someone reading the file cold, with no knowledge of the PR, the conversation, or what was decided against?* If not, it does not belong in the source. Do not reference:
diff --git a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/ClickableList.kt b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/ClickableList.kt
index 3a7b62da7a..7b20638907 100644
--- a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/ClickableList.kt
+++ b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/ClickableList.kt
@@ -18,7 +18,6 @@ import androidx.compose.ui.graphics.RectangleShape
 import androidx.compose.ui.graphics.Shape
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.unit.dp
-import com.hedvig.android.design.system.hedvig.ClickableListDefaults.iconSize
 import com.hedvig.android.design.system.hedvig.icon.ChevronRight
 import com.hedvig.android.design.system.hedvig.icon.HedvigIcons
 import com.hedvig.android.design.system.hedvig.tokens.ColorSchemeKeyTokens
@@ -96,7 +95,7 @@ private fun ClickableListItem(
             horizontalArrangement = Arrangement.End,
             verticalAlignment = Alignment.CenterVertically,
           ) {
-            Icon(HedvigIcons.ChevronRight, "", Modifier.size(iconSize))
+            Icon(HedvigIcons.ChevronRight, "", Modifier.size(ClickableListDefaults.iconSize))
           }
         },
         spaceBetween = 4.dp,
diff --git a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Dialog.kt b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Dialog.kt
index 080797e28b..6d226b271b 100644
--- a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Dialog.kt
+++ b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Dialog.kt
@@ -40,7 +40,6 @@ import com.hedvig.android.design.system.hedvig.DialogDefaults.ButtonSize.SMALL
 import com.hedvig.android.design.system.hedvig.DialogDefaults.DialogStyle
 import com.hedvig.android.design.system.hedvig.DialogDefaults.DialogStyle.Buttons
 import com.hedvig.android.design.system.hedvig.DialogDefaults.DialogStyle.NoButtons
-import com.hedvig.android.design.system.hedvig.DialogDefaults.defaultButtonSize
 import com.hedvig.android.design.system.hedvig.EmptyStateDefaults.EmptyStateButtonStyle
 import com.hedvig.android.design.system.hedvig.EmptyStateDefaults.EmptyStateIconStyle.ERROR
 import com.hedvig.android.design.system.hedvig.tokens.DialogTokens
@@ -86,7 +85,7 @@ fun HedvigAlertDialog(
   modifier: Modifier = Modifier,
   confirmButtonLabel: String = stringResource(Res.string.GENERAL_YES),
   dismissButtonLabel: String = stringResource(Res.string.GENERAL_NO),
-  buttonSize: DialogDefaults.ButtonSize = defaultButtonSize,
+  buttonSize: DialogDefaults.ButtonSize = DialogDefaults.defaultButtonSize,
 ) {
   HedvigAlertDialog(
     title = AnnotatedString(title),
@@ -109,7 +108,7 @@ fun HedvigAlertDialog(
   modifier: Modifier = Modifier,
   confirmButtonLabel: String = stringResource(Res.string.GENERAL_YES),
   dismissButtonLabel: String = stringResource(Res.string.GENERAL_NO),
-  buttonSize: DialogDefaults.ButtonSize = defaultButtonSize,
+  buttonSize: DialogDefaults.ButtonSize = DialogDefaults.defaultButtonSize,
 ) {
   HedvigDialog(
     style = Buttons(
diff --git a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/HedvigBigCard.kt b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/HedvigBigCard.kt
index 02fc97e4ec..2e4a52c097 100644
--- a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/HedvigBigCard.kt
+++ b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/HedvigBigCard.kt
@@ -15,9 +15,6 @@ import androidx.compose.ui.graphics.Shape
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.unit.dp
 import com.hedvig.android.compose.ui.LayoutWithoutPlacement
-import com.hedvig.android.design.system.hedvig.BigCardDefaults.inputTextStyle
-import com.hedvig.android.design.system.hedvig.BigCardDefaults.labelTextStyle
-import com.hedvig.android.design.system.hedvig.BigCardDefaults.padding
 import com.hedvig.android.design.system.hedvig.tokens.ColorSchemeKeyTokens
 import com.hedvig.android.design.system.hedvig.tokens.TypographyKeyTokens
 
@@ -57,7 +54,7 @@ fun HedvigBigCard(
   inputText: String?,
   modifier: Modifier = Modifier,
   enabled: Boolean = true,
-  textStyle: TextStyle = inputTextStyle,
+  textStyle: TextStyle = BigCardDefaults.inputTextStyle,
 ) {
   Surface(
     shape = HedvigTheme.shapes.cornerLarge,
@@ -72,14 +69,14 @@ fun HedvigBigCard(
     LayoutWithoutPlacement(
       sizeAdjustingContent = {
         // Always take up the space that the two texts would take
-        Column(Modifier.padding(padding)) {
-          HedvigText(text = labelText, style = labelTextStyle)
+        Column(Modifier.padding(BigCardDefaults.padding)) {
+          HedvigText(text = labelText, style = BigCardDefaults.labelTextStyle)
           HedvigText(text = "H", style = textStyle)
         }
       },
     ) {
       if (inputText == null) {
-        Box(Modifier.padding(padding)) {
+        Box(Modifier.padding(BigCardDefaults.padding)) {
           HedvigText(
             text = labelText,
             style = textStyle,
@@ -88,10 +85,10 @@ fun HedvigBigCard(
           )
         }
       } else {
-        Column(Modifier.padding(padding)) {
+        Column(Modifier.padding(BigCardDefaults.padding)) {
           HedvigText(
             text = labelText,
-            style = labelTextStyle,
+            style = BigCardDefaults.labelTextStyle,
             color = bigCardColors.labelTextColor(enabled),
           )
           HedvigText(
diff --git a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Notification.kt b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Notification.kt
index 511ea7f4d8..a05e5a0e8c 100644
--- a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Notification.kt
+++ b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Notification.kt
@@ -43,10 +43,6 @@ import com.hedvig.android.design.system.hedvig.NotificationDefaults.Notification
 import com.hedvig.android.design.system.hedvig.NotificationDefaults.NotificationPriority.Info
 import com.hedvig.android.design.system.hedvig.NotificationDefaults.NotificationPriority.InfoInline
 import com.hedvig.android.design.system.hedvig.NotificationDefaults.NotificationPriority.NeutralToast
-import com.hedvig.android.design.system.hedvig.NotificationDefaults.defaultStyle
-import com.hedvig.android.design.system.hedvig.NotificationDefaults.paddingNoIcon
-import com.hedvig.android.design.system.hedvig.NotificationDefaults.paddingWithIcon
-import com.hedvig.android.design.system.hedvig.NotificationDefaults.textStyle
 import com.hedvig.android.design.system.hedvig.icon.Campaign
 import com.hedvig.android.design.system.hedvig.icon.HedvigIcons
 import com.hedvig.android.design.system.hedvig.icon.InfoFilled
@@ -82,7 +78,7 @@ fun HedvigNotificationCard(
   priority: NotificationPriority,
   modifier: Modifier = Modifier,
   withIcon: Boolean = NotificationDefaults.withIconDefault,
-  style: InfoCardStyle = defaultStyle,
+  style: InfoCardStyle = NotificationDefaults.defaultStyle,
   buttonLoading: Boolean = false,
   minLines: Int = 1,
 ) {
@@ -104,10 +100,10 @@ fun HedvigNotificationCard(
   priority: NotificationPriority,
   modifier: Modifier = Modifier,
   withIcon: Boolean = NotificationDefaults.withIconDefault,
-  style: InfoCardStyle = defaultStyle,
+  style: InfoCardStyle = NotificationDefaults.defaultStyle,
   buttonLoading: Boolean = false,
 ) {
-  val padding = if (withIcon) paddingWithIcon else paddingNoIcon
+  val padding = if (withIcon) NotificationDefaults.paddingWithIcon else NotificationDefaults.paddingNoIcon
   val description = when (priority) {
     Attention, NotificationPriority.AttentionRound, Error, Info -> stringResource(Res.string.TALKBACK_NOTIFICATION_CARD)
     Campaign, InfoInline, NeutralToast, FancyInfo -> ""
@@ -125,7 +121,7 @@ fun HedvigNotificationCard(
     border = if (priority !is FancyInfo) priority.colors.borderColor else null,
   ) {
     val buttonDarkTheme = if (priority is InfoInline) isSystemInDarkTheme() else false
-    ProvideTextStyle(textStyle) {
+    ProvideTextStyle(NotificationDefaults.textStyle) {
       Row(Modifier.padding(padding)) {
         if (withIcon) {
           LayoutWithoutPlacement(
@@ -156,7 +152,7 @@ fun HedvigNotificationCard(
                     buttonSize = Small,
                     modifier = Modifier.weight(1f),
                   ) {
-                    HedvigText(style.leftButtonText, style = textStyle)
+                    HedvigText(style.leftButtonText, style = NotificationDefaults.textStyle)
                   }
                   Spacer(Modifier.width(4.dp))
                   HedvigButton(
@@ -166,7 +162,7 @@ fun HedvigNotificationCard(
                     buttonSize = Small,
                     modifier = Modifier.weight(1f),
                   ) {
-                    HedvigText(style.rightButtonText, style = textStyle)
+                    HedvigText(style.rightButtonText, style = NotificationDefaults.textStyle)
                   }
                 }
               }
@@ -184,11 +180,11 @@ fun HedvigNotificationCard(
                 ) {
                   LayoutWithoutPlacement(
                     sizeAdjustingContent = {
-                      HedvigText(style.buttonText, style = textStyle)
+                      HedvigText(style.buttonText, style = NotificationDefaults.textStyle)
                     },
                   ) {
                     if (!buttonLoading) {
-                      HedvigText(style.buttonText, style = textStyle)
+                      HedvigText(style.buttonText, style = NotificationDefaults.textStyle)
                     } else {
                       Box(
                         modifier = Modifier.fillMaxSize(),
diff --git a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Tooltip.kt b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Tooltip.kt
index 51f9fe76ae..cfebcca170 100644
--- a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Tooltip.kt
+++ b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/Tooltip.kt
@@ -49,10 +49,6 @@ import com.hedvig.android.design.system.hedvig.TooltipDefaults.TooltipStyle.Camp
 import com.hedvig.android.design.system.hedvig.TooltipDefaults.TooltipStyle.Campaign.Brightness.BLEAK
 import com.hedvig.android.design.system.hedvig.TooltipDefaults.TooltipStyle.Campaign.Brightness.BRIGHT
 import com.hedvig.android.design.system.hedvig.TooltipDefaults.TooltipStyle.Inbox
-import com.hedvig.android.design.system.hedvig.TooltipDefaults.arrowHeightDp
-import com.hedvig.android.design.system.hedvig.TooltipDefaults.arrowSpaceFromEdgeWhenOffCenteredDp
-import com.hedvig.android.design.system.hedvig.TooltipDefaults.arrowWidthDp
-import com.hedvig.android.design.system.hedvig.TooltipDefaults.defaultStyle
 import com.hedvig.android.design.system.hedvig.tokens.TooltipTokens
 import kotlin.time.Duration.Companion.seconds
 import kotlinx.coroutines.delay
@@ -63,7 +59,7 @@ fun HedvigTooltip(
   showTooltip: Boolean,
   tooltipShown: () -> Unit,
   modifier: Modifier = Modifier,
-  tooltipStyle: TooltipStyle = defaultStyle,
+  tooltipStyle: TooltipStyle = TooltipDefaults.defaultStyle,
   beakDirection: BeakDirection = BottomCenter,
   maxWidth: Dp = TooltipDefaults.defaultMaxWidth,
 ) {
@@ -150,9 +146,11 @@ private fun InnerChatTooltip(
 private fun Shape.withBeak(beakDirection: BeakDirection): Shape {
   return object : Shape {
     override fun createOutline(size: Size, layoutDirection: LayoutDirection, density: Density): Outline {
-      val arrowSpaceFromEdgeWhenOffCentered: Float = with(density) { arrowSpaceFromEdgeWhenOffCenteredDp.toPx() }
-      val arrowWidth = with(density) { arrowWidthDp.toPx() }
-      val arrowHeight = with(density) { arrowHeightDp.toPx() }
+      val arrowSpaceFromEdgeWhenOffCentered: Float = with(density) {
+        TooltipDefaults.arrowSpaceFromEdgeWhenOffCenteredDp.toPx()
+      }
+      val arrowWidth = with(density) { TooltipDefaults.arrowWidthDp.toPx() }
+      val arrowHeight = with(density) { TooltipDefaults.arrowHeightDp.toPx() }
       val squircleSize: Size = when (beakDirection) {
         BottomCenter, BottomStart, BottomEnd, TopCenter, TopStart, TopEnd -> {
           size.copy(height = size.height - arrowHeight)
diff --git a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/TopAppBar.kt b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/TopAppBar.kt
index fc624cdb91..e02e662b31 100644
--- a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/TopAppBar.kt
+++ b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/TopAppBar.kt
@@ -30,7 +30,6 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.dropUnlessResumed
-import com.hedvig.android.design.system.hedvig.TopAppBarDefaults.windowInsets
 import com.hedvig.android.design.system.hedvig.icon.ArrowLeft
 import com.hedvig.android.design.system.hedvig.icon.Close
 import com.hedvig.android.design.system.hedvig.icon.HedvigIcons
@@ -183,7 +182,7 @@ fun TopAppBarLayoutForActions(
     horizontalArrangement = Arrangement.spacedBy(8.dp, Alignment.End),
     verticalAlignment = Alignment.CenterVertically,
     modifier = modifier
-      .windowInsetsPadding(windowInsets)
+      .windowInsetsPadding(TopAppBarDefaults.windowInsets)
       .height(TopAppBarTokens.ContainerHeight)
       .fillMaxWidth()
       .padding(contentPadding),
diff --git a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/freetext/FreeTextOverlay.kt b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/freetext/FreeTextOverlay.kt
index 8aca058ddc..a1fa4bec38 100644
--- a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/freetext/FreeTextOverlay.kt
+++ b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/freetext/FreeTextOverlay.kt
@@ -56,7 +56,6 @@ import com.hedvig.android.design.system.hedvig.HedvigText
 import com.hedvig.android.design.system.hedvig.HedvigTheme
 import com.hedvig.android.design.system.hedvig.HorizontalDivider
 import com.hedvig.android.design.system.hedvig.Surface
-import com.hedvig.android.design.system.hedvig.freetext.FreeTextDefaults.counterPadding
 import com.hedvig.android.design.system.hedvig.fromToken
 import com.hedvig.android.design.system.hedvig.internal.Decoration
 import com.hedvig.android.design.system.hedvig.tokens.ColorSchemeKeyTokens.BackgroundBlack
@@ -241,7 +240,7 @@ private fun FreeTextOverlayContent(
             color = freeTextColors.labelColor,
             modifier = Modifier
               .fillMaxWidth()
-              .padding(counterPadding)
+              .padding(FreeTextDefaults.counterPadding)
               .wrapContentWidth(Alignment.End)
               .semantics {
                 contentDescription = characterLimitDescription
diff --git a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/freetext/FreeTextTriggerDisplay.kt b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/freetext/FreeTextTriggerDisplay.kt
index dd2ad8a6bb..67b179696f 100644
--- a/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/freetext/FreeTextTriggerDisplay.kt
+++ b/app/design-system/design-system-hedvig/src/commonMain/kotlin/com/hedvig/android/design/system/hedvig/freetext/FreeTextTriggerDisplay.kt
@@ -33,10 +33,6 @@ import com.hedvig.android.design.system.hedvig.freetext.FreeTextDisplayDefaults.
 import com.hedvig.android.design.system.hedvig.freetext.FreeTextDisplayDefaults.Height.Unlimited
 import com.hedvig.android.design.system.hedvig.freetext.FreeTextDisplayDefaults.Style
 import com.hedvig.android.design.system.hedvig.freetext.FreeTextDisplayDefaults.Style.Labeled
-import com.hedvig.android.design.system.hedvig.freetext.FreeTextDisplayDefaults.contentPadding
-import com.hedvig.android.design.system.hedvig.freetext.FreeTextDisplayDefaults.defaultHeight
-import com.hedvig.android.design.system.hedvig.freetext.FreeTextDisplayDefaults.defaultStyle
-import com.hedvig.android.design.system.hedvig.freetext.FreeTextDisplayDefaults.supportingTextPadding
 import com.hedvig.android.design.system.hedvig.fromToken
 import com.hedvig.android.design.system.hedvig.icon.HedvigIcons
 import com.hedvig.android.design.system.hedvig.icon.WarningFilled
@@ -64,8 +60,8 @@ fun FreeTextDisplay(
   freeTextPlaceholder: String,
   modifier: Modifier = Modifier,
   maxLength: Int = FreeTextDisplayDefaults.maxLength,
-  height: Height = defaultHeight,
-  style: Style = defaultStyle,
+  height: Height = FreeTextDisplayDefaults.defaultHeight,
+  style: Style = FreeTextDisplayDefaults.defaultStyle,
   hasError: Boolean = false,
   supportingText: String? = null,
   showCount: Boolean = true,
@@ -87,7 +83,7 @@ fun FreeTextDisplay(
       color = freeTextColors.displayContainerColor,
     ) {
       Column(
-        Modifier.padding(contentPadding),
+        Modifier.padding(FreeTextDisplayDefaults.contentPadding),
       ) {
         if (style is Labeled && freeTextValue != null) {
           Row(Modifier.fillMaxWidth()) {
@@ -147,7 +143,7 @@ fun FreeTextDisplay(
           text = supportingText,
           color = displayColors.supportingTextColor,
           style = FreeTextDisplayDefaults.countLabelStyle.value,
-          modifier = Modifier.padding(supportingTextPadding),
+          modifier = Modifier.padding(FreeTextDisplayDefaults.supportingTextPadding),
         )
       }
     }
diff --git a/app/feature/feature-claim-details/src/main/kotlin/com/hedvig/android/feature/claim/details/ui/SubmittedAndClosedColumns.kt b/app/feature/feature-claim-details/src/main/kotlin/com/hedvig/android/feature/claim/details/ui/SubmittedAndClosedColumns.kt
index 4f1ba9dc96..ee84d2e8e4 100644
--- a/app/feature/feature-claim-details/src/main/kotlin/com/hedvig/android/feature/claim/details/ui/SubmittedAndClosedColumns.kt
+++ b/app/feature/feature-claim-details/src/main/kotlin/com/hedvig/android/feature/claim/details/ui/SubmittedAndClosedColumns.kt
@@ -21,7 +21,6 @@ import hedvig.resources.claim_status_detail_closed
 import hedvig.resources.claim_status_detail_submitted
 import java.util.Locale
 import kotlin.time.Clock
-import kotlin.time.Clock.System
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.days
 import kotlin.time.Duration.Companion.seconds
@@ -77,7 +76,7 @@ private fun SubmittedAndClosedColumn(topText: String, bottomText: String, modifi
 }
 
 @Composable
-private fun currentTimeAsState(updateInterval: Duration = 1.seconds, clock: Clock = System): State<Instant> {
+private fun currentTimeAsState(updateInterval: Duration = 1.seconds, clock: Clock = Clock.System): State<Instant> {
   return produceState(initialValue = clock.now()) {
     while (isActive) {
       delay(updateInterval)
@@ -123,8 +122,8 @@ private fun PreviewSubmittedAndClosedInformation() {
   HedvigTheme {
     Surface(color = HedvigTheme.colorScheme.backgroundPrimary) {
       SubmittedAndClosedColumns(
-        submittedAt = System.now().minus(10.days),
-        closedAt = System.now().minus(30.seconds),
+        submittedAt = Clock.System.now().minus(10.days),
+        closedAt = Clock.System.now().minus(30.seconds),
         locale = Locale.ENGLISH,
       )
     }
diff --git a/app/feature/feature-home/src/main/kotlin/com/hedvig/android/feature/home/home/ui/HomeDestination.kt b/app/feature/feature-home/src/main/kotlin/com/hedvig/android/feature/home/home/ui/HomeDestination.kt
index 5f337228cc..98a9fe96f8 100644
--- a/app/feature/feature-home/src/main/kotlin/com/hedvig/android/feature/home/home/ui/HomeDestination.kt
+++ b/app/feature/feature-home/src/main/kotlin/com/hedvig/android/feature/home/home/ui/HomeDestination.kt
@@ -225,8 +225,7 @@ import hedvig.resources.RESUME_CLAIM_DELETE_BUTTON
 import hedvig.resources.RESUME_CLAIM_DELETE_TITLE
 import hedvig.resources.RESUME_CLAIM_EXPIRED_BODY
 import hedvig.resources.RESUME_CLAIM_EXPIRED_TITLE
-import hedvig.resources.Res.drawable
-import hedvig.resources.Res.string
+import hedvig.resources.Res
 import hedvig.resources.TOAST_NEW_OFFER
 import hedvig.resources.blur_background
 import hedvig.resources.general_cancel_button
@@ -237,7 +236,6 @@ import hedvig.resources.home_tab_welcome_title_without_name
 import hedvig.resources.ongoing_shop_session_dismiss_offer
 import kotlin.math.roundToInt
 import kotlin.time.Clock
-import kotlin.time.Clock.System
 import kotlin.time.Duration.Companion.milliseconds
 import kotlin.time.ExperimentalTime
 import kotlin.time.Instant
@@ -388,8 +386,8 @@ private fun HomeScreen(
     // The draft is expired, so acknowledging the notice (Close button, scrim, or back) removes it.
     // Matches the Ready-for-dev design: single Close, closing removes the draft claim card.
     ErrorDialog(
-      title = stringResource(string.RESUME_CLAIM_EXPIRED_TITLE),
-      message = stringResource(string.RESUME_CLAIM_EXPIRED_BODY),
+      title = stringResource(Res.string.RESUME_CLAIM_EXPIRED_TITLE),
+      message = stringResource(Res.string.RESUME_CLAIM_EXPIRED_BODY),
       onDismiss = {
         showDraftExpiredDialog = false
         draftClaim?.let { deleteDraftClaim(it.id) }
@@ -399,10 +397,10 @@ private fun HomeScreen(
   val draftIdToDelete = draftIdPendingDeleteConfirmation
   if (draftIdToDelete != null) {
     HedvigAlertDialog(
-      title = stringResource(string.RESUME_CLAIM_DELETE_TITLE),
-      text = stringResource(string.RESUME_CLAIM_DELETE_BODY),
-      confirmButtonLabel = stringResource(string.RESUME_CLAIM_DELETE_BUTTON),
-      dismissButtonLabel = stringResource(string.general_cancel_button),
+      title = stringResource(Res.string.RESUME_CLAIM_DELETE_TITLE),
+      text = stringResource(Res.string.RESUME_CLAIM_DELETE_BODY),
+      confirmButtonLabel = stringResource(Res.string.RESUME_CLAIM_DELETE_BUTTON),
+      dismissButtonLabel = stringResource(Res.string.general_cancel_button),
       onDismissRequest = { draftIdPendingDeleteConfirmation = null },
       onConfirmClick = {
         draftIdPendingDeleteConfirmation = null
@@ -457,7 +455,7 @@ private fun HomeScreen(
             },
             onContinueDraftClaim = {
               if (draftClaim != null) {
-                if (draftClaim.isExpired(System.now())) {
+                if (draftClaim.isExpired(Clock.System.now())) {
                   showDraftExpiredDialog = true
                 } else {
                   navigateToClaimChat(true)
@@ -558,7 +556,7 @@ private fun HomeScreenTopBar(
       }
       if (shouldShowNewMessageTooltip) {
         HedvigTooltip(
-          message = stringResource(string.CHAT_NEW_MESSAGE),
+          message = stringResource(Res.string.CHAT_NEW_MESSAGE),
           showTooltip = shouldShowNewMessageTooltip,
           tooltipStyle = Inbox,
           beakDirection = TopEnd,
@@ -587,7 +585,7 @@ private fun ColumnScope.CrossSellsTooltip(uiState: Success, setEpochDayWhenLastT
     var shouldSetEpochDayWhenLastToolTipShown by remember { mutableStateOf(false) }
     LaunchedEffect(shouldSetEpochDayWhenLastToolTipShown) {
       if (shouldSetEpochDayWhenLastToolTipShown) {
-        val today = System.now().toLocalDateTime(
+        val today = Clock.System.now().toLocalDateTime(
           TimeZone.currentSystemDefault(),
         ).date.toEpochDays()
         delay(5000.milliseconds)
@@ -596,7 +594,7 @@ private fun ColumnScope.CrossSellsTooltip(uiState: Success, setEpochDayWhenLastT
     }
     if (shouldShowCrossSellsTooltip) {
       HedvigTooltip(
-        message = stringResource(string.TOAST_NEW_OFFER),
+        message = stringResource(Res.string.TOAST_NEW_OFFER),
         showTooltip = true,
         tooltipStyle = Campaign(
           subMessage = null,
@@ -683,7 +681,7 @@ private fun HomeScreenSuccess(
     // to "hide" it (the content cards already do; so do the pinned pills).
     if (HedvigTheme.colorScheme.isLight) {
       Image(
-        painter = painterResource(drawable.blur_background),
+        painter = painterResource(Res.drawable.blur_background),
         contentDescription = null,
         contentScale = ContentScale.Crop,
         modifier = Modifier.matchParentSize(),
@@ -1212,7 +1210,7 @@ private fun MemberRemindersSection(
           .padding(horizontalInsets),
       ) {
         HedvigText(
-          text = stringResource(string.HOME_TODO_SECTION_TITLE),
+          text = stringResource(Res.string.HOME_TODO_SECTION_TITLE),
           style = HedvigTheme.typography.headlineSmall,
           modifier = Modifier.semantics { heading() },
         )
@@ -1244,7 +1242,7 @@ private fun QuotesSection(
   val contentPadding = PaddingValues(horizontal = 16.dp) + horizontalInsets
   Column(Modifier.fillMaxWidth()) {
     HedvigText(
-      text = stringResource(string.HOME_QUOTES_SECTION_TITLE),
+      text = stringResource(Res.string.HOME_QUOTES_SECTION_TITLE),
       style = HedvigTheme.typography.headlineSmall,
       modifier = Modifier
         .padding(contentPadding)
@@ -1301,7 +1299,7 @@ private fun QuoteCard(
             HedvigText(text = session.title, style = HedvigTheme.typography.bodySmall)
             val secondary = session.monthlyNet?.let {
               stringResource(
-                string.OFFER_COST_AND_PREMIUM_PERIOD_ABBREVIATION,
+                Res.string.OFFER_COST_AND_PREMIUM_PERIOD_ABBREVIATION,
                 it,
               )
             } ?: session.subtitle
@@ -1323,13 +1321,13 @@ private fun QuoteCard(
           ) {
             Icon(
               imageVector = HedvigIcons.Close,
-              contentDescription = stringResource(string.ongoing_shop_session_dismiss_offer),
+              contentDescription = stringResource(Res.string.ongoing_shop_session_dismiss_offer),
             )
           }
         }
         Spacer(Modifier.height(12.dp))
         HedvigButton(
-          text = stringResource(string.general_continue_button),
+          text = stringResource(Res.string.general_continue_button),
           onClick = { onResumeClick(session.resumeUrl) },
           buttonStyle = Secondary,
           buttonSize = ButtonSize.Medium,
@@ -1357,7 +1355,7 @@ private fun QuickActionTilesSection(
       .padding(horizontalInsets),
   ) {
     HedvigText(
-      text = stringResource(string.HC_QUICK_ACTIONS_TITLE),
+      text = stringResource(Res.string.HC_QUICK_ACTIONS_TITLE),
       style = HedvigTheme.typography.headlineSmall,
       modifier = Modifier.semantics { heading() },
     )
@@ -1485,21 +1483,21 @@ private fun MainActionCarouselSection(
       .padding(horizontalInsets),
   ) {
     HedvigButton(
-      text = stringResource(string.home_tab_claim_button_text),
+      text = stringResource(Res.string.home_tab_claim_button_text),
       onClick = onMakeClaim,
       enabled = true,
       buttonStyle = RoundedPrimary,
     )
     if (isHelpCenterEnabled) {
       HedvigButton(
-        text = stringResource(string.home_tab_get_help),
+        text = stringResource(Res.string.home_tab_get_help),
         onClick = onHelpAndSupport,
         enabled = true,
         buttonStyle = RoundedLiquidGlass,
       )
     }
     HedvigButton(
-      text = stringResource(string.DASHBOARD_OPEN_CHAT),
+      text = stringResource(Res.string.DASHBOARD_OPEN_CHAT),
       onClick = onContactUs,
       enabled = true,
       buttonStyle = RoundedLiquidGlass,
@@ -1522,7 +1520,7 @@ private fun AddonsSection(
       .padding(horizontalInsets),
   ) {
     HedvigText(
-      text = stringResource(string.INSURANCE_ADDONS_SUBHEADING),
+      text = stringResource(Res.string.INSURANCE_ADDONS_SUBHEADING),
       style = HedvigTheme.typography.headlineSmall,
       modifier = Modifier.semantics { heading() },
     )
@@ -1532,7 +1530,7 @@ private fun AddonsSection(
         subtitle = addon.description,
         pillowImage = null,
         pillow = { AddonPillow(addon.flowType) },
-        buttonText = stringResource(string.HOME_ADDONS_READ_MORE_BUTTON),
+        buttonText = stringResource(Res.string.HOME_ADDONS_READ_MORE_BUTTON),
         onButtonClick = { navigateToAddonPurchaseFlow(addon.eligibleInsurancesIds) },
         imageLoader = imageLoader,
         modifier = Modifier.fillMaxWidth(),
@@ -1550,13 +1548,13 @@ private fun DiscoverInsurancesSection(
   imageLoader: ImageLoader,
 ) {
   CrossSellsSection(
-    title = stringResource(string.HOME_DISCOVER_SECTION_TITLE),
+    title = stringResource(Res.string.HOME_DISCOVER_SECTION_TITLE),
     crossSells = crossSells,
     onCrossSellClick = onCrossSellClick,
     modifier = Modifier.padding(horizontal = 16.dp),
     onSheetDismissed = {},
     imageLoader = imageLoader,
-    buttonText = stringResource(string.HOME_DISCOVER_SEE_PRICE_BUTTON),
+    buttonText = stringResource(Res.string.HOME_DISCOVER_SEE_PRICE_BUTTON),
     buttonSize = ButtonSize.Small,
     buttonShape = HedvigTheme.shapes.cornerFull,
   )
@@ -1573,7 +1571,7 @@ private fun WelcomeMessage(firstName: String, modifier: Modifier = Modifier) {
   )
   if (firstName.isBlank()) {
     HedvigText(
-      text = stringResource(string.home_tab_welcome_title_without_name),
+      text = stringResource(Res.string.home_tab_welcome_title_without_name),
       style = titleStyle,
       modifier = modifier.fillMaxWidth(),
     )
@@ -1584,12 +1582,12 @@ private fun WelcomeMessage(firstName: String, modifier: Modifier = Modifier) {
     modifier = modifier.fillMaxWidth(),
   ) {
     HedvigText(
-      text = stringResource(string.HOME_GREETING_TITLE, firstName),
+      text = stringResource(Res.string.HOME_GREETING_TITLE, firstName),
       style = titleStyle,
       modifier = Modifier.fillMaxWidth(),
     )
     HedvigText(
-      text = stringResource(string.HOME_GREETING_SUBTITLE),
+      text = stringResource(Res.string.HOME_GREETING_SUBTITLE),
       color = HedvigTheme.colorScheme.textSecondary,
       style = titleStyle,
       modifier = Modifier.fillMaxWidth(),
@@ -1879,19 +1877,19 @@ private fun PreviewHomeScreenAllHomeTextTypes(
 
 private val previewQuickActions: List<QuickAction> = listOf(
   MultiSelectExpandedLink(
-    titleRes = string.HC_QUICK_ACTIONS_EDIT_INSURANCE_TITLE,
-    hintTextRes = string.HC_QUICK_ACTIONS_EDIT_INSURANCE_SUBTITLE,
+    titleRes = Res.string.HC_QUICK_ACTIONS_EDIT_INSURANCE_TITLE,
+    hintTextRes = Res.string.HC_QUICK_ACTIONS_EDIT_INSURANCE_SUBTITLE,
     links = listOf(
       StandaloneQuickLink(
-        titleRes = string.HC_QUICK_ACTIONS_UPGRADE_COVERAGE_TITLE,
-        hintTextRes = string.HC_QUICK_ACTIONS_UPGRADE_COVERAGE_SUBTITLE,
+        titleRes = Res.string.HC_QUICK_ACTIONS_UPGRADE_COVERAGE_TITLE,
+        hintTextRes = Res.string.HC_QUICK_ACTIONS_UPGRADE_COVERAGE_SUBTITLE,
         quickLinkDestination = QuickLinkChangeTier,
       ),
     ),
   ),
   StandaloneQuickLink(
-    titleRes = string.HC_QUICK_ACTIONS_CHANGE_ADDRESS_TITLE,
-    hintTextRes = string.HC_QUICK_ACTIONS_CHANGE_ADDRESS_SUBTITLE,
+    titleRes = Res.string.HC_QUICK_ACTIONS_CHANGE_ADDRESS_TITLE,
+    hintTextRes = Res.string.HC_QUICK_ACTIONS_CHANGE_ADDRESS_SUBTITLE,
     quickLinkDestination = QuickLinkChangeAddress,
   ),
 )
diff --git a/app/feature/feature-payments/src/main/kotlin/com/hedvig/android/feature/payments/ui/payments/PaymentsDestination.kt b/app/feature/feature-payments/src/main/kotlin/com/hedvig/android/feature/payments/ui/payments/PaymentsDestination.kt
index 5d674040e5..f2c7a75f37 100644
--- a/app/feature/feature-payments/src/main/kotlin/com/hedvig/android/feature/payments/ui/payments/PaymentsDestination.kt
+++ b/app/feature/feature-payments/src/main/kotlin/com/hedvig/android/feature/payments/ui/payments/PaymentsDestination.kt
@@ -117,7 +117,7 @@ import hedvig.resources.Res
 import hedvig.resources.TAB_PAYMENTS_TITLE
 import hedvig.resources.info_card_missing_payment_body
 import hedvig.resources.info_card_missing_payment_missing_payments_body
-import kotlin.time.Clock.System
+import kotlin.time.Clock
 import kotlin.time.Duration.Companion.days
 import kotlinx.datetime.LocalDate
 import kotlinx.datetime.TimeZone
@@ -822,7 +822,7 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(100.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "rdg",
         ),
         upcomingPaymentInfo = NoInfo,
@@ -837,7 +837,7 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(100.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "rdg",
         ),
         upcomingPaymentInfo = NoInfo,
@@ -854,7 +854,7 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(100.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "iky",
         ),
         upcomingPaymentInfo = InProgress,
@@ -869,12 +869,12 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(400.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "pwe",
         ),
         upcomingPaymentInfo = PaymentFailed(
-          System.now().toLocalDateTime(TimeZone.UTC).date,
-          System.now().minus(30.days).toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().minus(30.days).toLocalDateTime(TimeZone.UTC).date,
           isManualChargeAllowed = ManualChargeToPrompt(
             UiMoney(200.0, UiCurrencyCode.SEK),
           ),
@@ -890,7 +890,7 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(100.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "fkjse",
         ),
         upcomingPaymentInfo = NoInfo,
@@ -905,12 +905,12 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(100.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "qrdfgeth",
         ),
         upcomingPaymentInfo = PaymentFailed(
-          System.now().toLocalDateTime(TimeZone.UTC).date,
-          System.now().minus(30.days).toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().minus(30.days).toLocalDateTime(TimeZone.UTC).date,
           isManualChargeAllowed = null,
         ),
         ongoingCharges = emptyList(),
@@ -926,7 +926,7 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(100.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "qrdfgeth2",
         ),
         upcomingPaymentInfo = NoInfo,
@@ -943,17 +943,17 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(100.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "w345423t6",
         ),
         upcomingPaymentInfo = PaymentFailed(
-          System.now().toLocalDateTime(TimeZone.UTC).date,
-          System.now().minus(30.days).toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().minus(30.days).toLocalDateTime(TimeZone.UTC).date,
           isManualChargeAllowed = null,
         ),
         ongoingCharges = emptyList(),
         connectedPaymentInfo = ConnectedPaymentInfo.NeedsPayinSetup(
-          dueDateToConnect = System.now().plus(30.days).toLocalDateTime(TimeZone.UTC).date,
+          dueDateToConnect = Clock.System.now().plus(30.days).toLocalDateTime(TimeZone.UTC).date,
         ),
         showPayoutButton = false,
         memberType = MemberType.STANDARD_MEMBER,
@@ -964,17 +964,17 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(100.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "42345",
         ),
         upcomingPaymentInfo = PaymentFailed(
-          System.now().toLocalDateTime(TimeZone.UTC).date,
-          System.now().minus(30.days).toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().minus(30.days).toLocalDateTime(TimeZone.UTC).date,
           isManualChargeAllowed = null,
         ),
         ongoingCharges = emptyList(),
         connectedPaymentInfo = ConnectedPaymentInfo.NeedsPayinSetup(
-          System.now().plus(30.days).toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().plus(30.days).toLocalDateTime(TimeZone.UTC).date,
         ),
         showPayoutButton = false,
         memberType = MemberType.STANDARD_MEMBER,
@@ -1029,7 +1029,7 @@ private class PaymentsStatePreviewProvider : CollectionPreviewParameterProvider<
         isRetrying = false,
         upcomingPayment = UpcomingPayment.Content(
           UiMoney(100.0, SEK),
-          System.now().toLocalDateTime(TimeZone.UTC).date,
+          Clock.System.now().toLocalDateTime(TimeZone.UTC).date,
           "w345423t6",
         ),
         upcomingPaymentInfo = UpcomingPaymentInfo.NoInfo,
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index cc345f31c8..f3bd52e4e1 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -247,6 +247,7 @@ zXing = { module = "com.google.zxing:core", version.ref = "zXing" }
 zoomable = { module = "com.mxalbert.zoomable:zoomable", version.ref = "zoomable" }
 # lint dependencies
 lintApi = { module = "com.android.tools.lint:lint-api", version.ref = "lintApi" }
+lintTests = { module = "com.android.tools.lint:lint-tests", version.ref = "lintApi" }
 
 # temporary bug workaround
 androidx-kmp-preview-bug1-workaround = { module = "androidx.customview:customview-poolingcontainer", version = "1.1.0" }
diff --git a/hedvig-lint/build.gradle.kts b/hedvig-lint/build.gradle.kts
index 585c1e0326..595239799e 100644
--- a/hedvig-lint/build.gradle.kts
+++ b/hedvig-lint/build.gradle.kts
@@ -9,6 +9,9 @@ plugins {
 
 dependencies {
   compileOnly(libs.lintApi)
+  testImplementation(libs.junit)
+  testImplementation(libs.lintApi)
+  testImplementation(libs.lintTests)
 }
 
 java {
diff --git a/hedvig-lint/src/main/kotlin/com/hedvig/android/lint/HedvigLintRegistry.kt b/hedvig-lint/src/main/kotlin/com/hedvig/android/lint/HedvigLintRegistry.kt
index bf5c2ddf08..f719a19c90 100644
--- a/hedvig-lint/src/main/kotlin/com/hedvig/android/lint/HedvigLintRegistry.kt
+++ b/hedvig-lint/src/main/kotlin/com/hedvig/android/lint/HedvigLintRegistry.kt
@@ -8,6 +8,7 @@ import com.android.tools.lint.detector.api.Issue
 class HedvigLintRegistry : IssueRegistry() {
   override val issues: List<Issue> = listOf(
     Material2Detector.ISSUE,
+    NamespaceImportDetector.ISSUE,
   )
 
   override val api: Int = CURRENT_API
diff --git a/hedvig-lint/src/main/kotlin/com/hedvig/android/lint/NamespaceImportDetector.kt b/hedvig-lint/src/main/kotlin/com/hedvig/android/lint/NamespaceImportDetector.kt
new file mode 100644
index 0000000000..b824c0ed7d
--- /dev/null
+++ b/hedvig-lint/src/main/kotlin/com/hedvig/android/lint/NamespaceImportDetector.kt
@@ -0,0 +1,122 @@
+package com.hedvig.android.lint
+
+import com.android.tools.lint.client.api.UElementHandler
+import com.android.tools.lint.detector.api.Category
+import com.android.tools.lint.detector.api.Issue
+import com.android.tools.lint.detector.api.JavaContext
+import com.android.tools.lint.detector.api.Severity
+import com.android.tools.lint.detector.api.SourceCodeScanner
+import com.android.tools.lint.detector.api.StringOption
+import com.android.tools.lint.detector.api.isKotlin
+import com.hedvig.android.lint.config.Priorities
+import com.hedvig.android.lint.util.OptionLoadingDetector
+import com.hedvig.android.lint.util.StringSetLintOption
+import com.hedvig.android.lint.util.sourceImplementation
+import org.jetbrains.uast.UElement
+import org.jetbrains.uast.UImportStatement
+
+private const val NamespaceImportDetectorIssueId = "NamespaceImport"
+
+/**
+ * Reports imports that shorten a qualified reference past the point where the short name still says
+ * what it is, such as `import hedvig.resources.Res.string` turning `Res.string.FOO` into `string.FOO`.
+ *
+ * Importing a type is fine, so a sealed subclass or enum entry (`HomeUiState.Success`) is left alone.
+ * Importing a member off a class owner is not, because the owner is what gave the name its meaning.
+ * A capitalized name that is still meaningless on its own, such as `Clock.System`, is covered by
+ * [DENY_LIST].
+ */
+internal class NamespaceImportDetector
+  @JvmOverloads
+  constructor(
+    private val extraDeniedImports: StringSetLintOption = StringSetLintOption(DENY_LIST),
+    private val allowedImports: StringSetLintOption = StringSetLintOption(ALLOW_LIST),
+  ) : OptionLoadingDetector(extraDeniedImports, allowedImports), SourceCodeScanner {
+    override fun getApplicableUastTypes(): List<Class<out UElement>> = listOf<Class<out UElement>>(
+      UImportStatement::class.java,
+    )
+
+    override fun createUastHandler(context: JavaContext): UElementHandler? {
+      val language = context.uastFile?.lang ?: return null
+      if (!isKotlin(language)) return null
+      return object : UElementHandler() {
+        override fun visitImportStatement(node: UImportStatement) {
+          if (node.isOnDemand) return // Wildcards are owned by ktlint's no-wildcard-imports.
+          val importText = node.sourcePsi?.text ?: return
+          // An alias is a deliberate act of renaming, and gives the use site a name of its own.
+          if (importText.contains(" as ")) return
+          val qualifiedName = importText.removePrefix("import").trim()
+
+          val importedName = qualifiedName.substringAfterLast('.')
+          val ownerPath = qualifiedName.substringBeforeLast('.', "")
+          val ownerName = ownerPath.substringAfterLast('.')
+          if (importedName.isEmpty() || ownerName.isEmpty()) return
+          // A lowercase owner is a package, so this is a plain top-level import.
+          if (!ownerName.first().isUpperCase()) return
+          // `Duration.Companion.seconds` and friends exist to enable the `5.seconds` receiver idiom.
+          if (ownerName == "Companion") return
+          // A capitalized path segment is not proof of a class: `platform.Foundation` is a package.
+          if (context.evaluator.findClass(ownerPath) == null) return
+          if (qualifiedName in allowedImports.value) return
+
+          val importsAMember = importedName.first().isLowerCase()
+          val isDeniedByName = qualifiedName in DEFAULT_DENIED_IMPORTS ||
+            qualifiedName in extraDeniedImports.value
+          if (!importsAMember && !isDeniedByName) return
+
+          context.report(
+            issue = ISSUE,
+            location = context.getLocation(node),
+            message = "Import `$ownerName` and write `$ownerName.$importedName` at the use site. " +
+              "On its own, `$importedName` no longer says what it is.",
+          )
+        }
+      }
+    }
+
+    companion object {
+      /**
+       * Imports whose final segment is capitalized, so they read as a type, but which still leave
+       * nothing meaningful behind at the use site.
+       */
+      private val DEFAULT_DENIED_IMPORTS = setOf(
+        "kotlin.time.Clock.System",
+      )
+
+      internal val DENY_LIST = StringOption(
+        "denied-member-imports",
+        "A comma-separated list of fully qualified imports to reject in addition to the built-in ones.",
+        null,
+        "This property should define a comma-separated list of fully qualified imports that must " +
+          "never be used, even though their final segment is capitalized",
+      )
+
+      internal val ALLOW_LIST = StringOption(
+        "allowed-member-imports",
+        "A comma-separated list of fully qualified member imports that should be allowed.",
+        null,
+        "This property should define a comma-separated list of fully qualified member imports that " +
+          "are allowed to shorten their receiver away",
+      )
+
+      val ISSUE = Issue.create(
+        id = NamespaceImportDetectorIssueId,
+        briefDescription = "Importing a member hides the receiver that carries its meaning",
+        explanation = """
+        Import the type, never the namespace. An import may shorten a qualified reference only when \
+        the short name still says what it is to someone reading that line cold.
+
+        Sealed subclasses and enum entries pass that test, so `HomeUiState.Success` may be imported \
+        as `Success`. Members reached through a receiver that carries the meaning do not: \
+        `Res.string.FOO` must not become `string.FOO`, and `Clock.System.now()` must not become \
+        `System.now()`, which additionally reads as `java.lang.System`.
+      """,
+        category = Category.CORRECTNESS,
+        priority = Priorities.NORMAL,
+        severity = Severity.ERROR,
+        implementation = sourceImplementation<NamespaceImportDetector>(),
+      )
+        .setOptions(listOf(DENY_LIST, ALLOW_LIST))
+        .setEnabledByDefault(true)
+    }
+  }
diff --git a/hedvig-lint/src/test/kotlin/com/hedvig/android/lint/NamespaceImportDetectorTest.kt b/hedvig-lint/src/test/kotlin/com/hedvig/android/lint/NamespaceImportDetectorTest.kt
new file mode 100644
index 0000000000..2e586d1b98
--- /dev/null
+++ b/hedvig-lint/src/test/kotlin/com/hedvig/android/lint/NamespaceImportDetectorTest.kt
@@ -0,0 +1,198 @@
+package com.hedvig.android.lint
+
+import com.android.tools.lint.checks.infrastructure.LintDetectorTest
+import com.android.tools.lint.detector.api.Detector
+import com.android.tools.lint.detector.api.Issue
+import org.junit.Test
+
+class NamespaceImportDetectorTest : LintDetectorTest() {
+  override fun getDetector(): Detector = NamespaceImportDetector()
+
+  override fun getIssues(): List<Issue> = listOf(NamespaceImportDetector.ISSUE)
+
+  private val resources = kotlin(
+    """
+    package com.example.res
+    object Res {
+      object string {
+        const val GREETING = "hi"
+      }
+      object drawable
+    }
+    """,
+  ).indented()
+
+  private val designSystem = kotlin(
+    """
+    package com.example.ds
+    object TooltipDefaults {
+      val defaultStyle: Int = 0
+    }
+    """,
+  ).indented()
+
+  private val uiState = kotlin(
+    """
+    package com.example.ui
+    sealed interface HomeUiState {
+      object Success : HomeUiState
+      object Loading : HomeUiState
+    }
+    """,
+  ).indented()
+
+  private val duration = kotlin(
+    """
+    package com.example.time
+    class Duration {
+      companion object {
+        val seconds: Int = 1
+      }
+    }
+    """,
+  ).indented()
+
+  // Kotlin/Native interop packages are capitalized, which a purely textual check misreads as a class.
+  private val capitalizedPackage = kotlin(
+    """
+    package platform.Foundation
+    fun systemLocale(): String = ""
+    """,
+  ).indented()
+
+  @Test
+  fun testReportsLowercaseMemberImport() {
+    lint()
+      .files(
+        resources,
+        kotlin(
+          """
+          package com.example.app
+          import com.example.res.Res.string
+          fun greet() = string.GREETING
+          """,
+        ).indented(),
+      )
+      .issues(NamespaceImportDetector.ISSUE)
+      .run()
+      .expectErrorCount(1)
+      .expectContains("Import Res and write Res.string at the use site")
+  }
+
+  @Test
+  fun testReportsEveryOffendingImportInAFile() {
+    lint()
+      .files(
+        resources,
+        designSystem,
+        kotlin(
+          """
+          package com.example.app
+          import com.example.ds.TooltipDefaults.defaultStyle
+          import com.example.res.Res.drawable
+          import com.example.res.Res.string
+          fun use() = listOf(string, drawable, defaultStyle)
+          """,
+        ).indented(),
+      )
+      .issues(NamespaceImportDetector.ISSUE)
+      .run()
+      .expectErrorCount(3)
+  }
+
+  @Test
+  fun testAllowsSealedSubclassImport() {
+    lint()
+      .files(
+        uiState,
+        kotlin(
+          """
+          package com.example.app
+          import com.example.ui.HomeUiState
+          import com.example.ui.HomeUiState.Loading
+          import com.example.ui.HomeUiState.Success
+          fun describe(state: HomeUiState) = when (state) {
+            Success -> "ok"
+            Loading -> "wait"
+          }
+          """,
+        ).indented(),
+      )
+      .issues(NamespaceImportDetector.ISSUE)
+      .run()
+      .expectClean()
+  }
+
+  @Test
+  fun testAllowsCompanionExtensionImport() {
+    lint()
+      .files(
+        duration,
+        kotlin(
+          """
+          package com.example.app
+          import com.example.time.Duration
+          import com.example.time.Duration.Companion.seconds
+          fun timeout() = Duration.seconds
+          """,
+        ).indented(),
+      )
+      .issues(NamespaceImportDetector.ISSUE)
+      .run()
+      .expectClean()
+  }
+
+  @Test
+  fun testIgnoresCapitalizedPackage() {
+    lint()
+      .files(
+        capitalizedPackage,
+        kotlin(
+          """
+          package com.example.app
+          import platform.Foundation.systemLocale
+          fun locale() = systemLocale()
+          """,
+        ).indented(),
+      )
+      .issues(NamespaceImportDetector.ISSUE)
+      .run()
+      .expectClean()
+  }
+
+  @Test
+  fun testAllowsAliasedImport() {
+    lint()
+      .files(
+        resources,
+        kotlin(
+          """
+          package com.example.app
+          import com.example.res.Res.string as StringResources
+          fun greet() = StringResources.GREETING
+          """,
+        ).indented(),
+      )
+      .issues(NamespaceImportDetector.ISSUE)
+      .run()
+      .expectClean()
+  }
+
+  @Test
+  fun testIgnoresWildcardImport() {
+    lint()
+      .files(
+        resources,
+        kotlin(
+          """
+          package com.example.app
+          import com.example.res.*
+          fun greet() = Res.string.GREETING
+          """,
+        ).indented(),
+      )
+      .issues(NamespaceImportDetector.ISSUE)
+      .run()
+      .expectClean()
+  }
+}