Cleanup. Fix simple linter error.

eslint.config.js

@@ -34,6 +34,7 @@ export default tseslint.config(
         "error",
         { prefer: "type-imports", fixStyle: "inline-type-imports" },
       ],
+      "@typescript-eslint/consistent-type-definitions": "off",
       "@typescript-eslint/no-unused-vars": [
         "error",
         {

src/App.tsx

@@ -10,24 +10,12 @@ import {
   DialogContent,
 } from "@mui/material"
 
-// TODO: Use Material UI later.
 // TODO: Improve error-handling. Introduce some proper server response.
 
-// For better type-error messages when you have inexhaustive switch cases.
-function assertNever(value: never): never {
-  throw new Error(`Unexpected value: ${value}`)
-}
-
 // === Image ===
 type ImageId = string
 type ImageRef = string
 
-type Image = {
-  id: ImageId
-  dimension: Dimension
-  source: ImageRef
-}
-
 // === Dimension ===
 
 type Dimension = {
@@ -35,8 +23,11 @@ type Dimension = {
   height: number
 }
 const Dimension = {
-  medium: { width: 180, height: 180 } as Dimension,
+  medium: { width: 180, height: 180 },
-  big: { width: 720, height: 720 } as Dimension,
+  big: { width: 720, height: 720 },
+} satisfies {
+  medium: Dimension
+  big: Dimension
 }
 
 // === Page ===
@@ -69,7 +60,7 @@ const Page = {
   },
   // for hashing in maps to avoid identity problems
   key(page: Page): PageKey {
-    return `${page.page}:${page.limit}`
+    return `${String(page.page)}:${String(page.limit)}`
   },
   isFirst(page: Page): boolean {
     return page.page === FIRST_PAGE
@@ -88,9 +79,11 @@ const picsumApiImageSchema = z.object({
 type PicsumApiImage = z.infer<typeof picsumApiImageSchema>
 
 async function getPicsumImages({ page, limit }: Page): Promise<PicsumApiImage[]> {
-  const response = await fetch(`https://picsum.photos/v2/list?limit=${limit}&page=${page}`)
+  const response = await fetch(
+    `https://picsum.photos/v2/list?limit=${String(limit)}&page=${String(page)}`,
+  )
   if (!response.ok) {
-    throw new Error(`Failed to fetch images: ${response.status}`)
+    throw new Error(`Failed to fetch images: ${String(response.status)}`)
   }
 
   const json: unknown = await response.json()
@@ -99,16 +92,6 @@ async function getPicsumImages({ page, limit }: Page): Promise<PicsumApiImage[]>
   return data
 }
 
-// TODO: We don't really need this.
-async function getImages(page: Page): Promise<Image[]> {
-  const data = await getPicsumImages(page)
-  return data.map(({ id, download_url, width, height }) => ({
-    id: id as ImageId,
-    dimension: { width, height },
-    source: download_url as ImageRef,
-  }))
-}
-
 async function getImageIds(page: Page): Promise<ImageId[]> {
   const data = await getPicsumImages(page)
   return data.map(({ id }) => id)
@@ -116,7 +99,7 @@ async function getImageIds(page: Page): Promise<ImageId[]> {
 
 // Use this for `<img src=... />`
 function getImageSource(id: ImageId, dimension: Dimension): ImageRef {
-  return `https://picsum.photos/id/${id}/${dimension.width}/${dimension.height}`
+  return `https://picsum.photos/id/${id}/${String(dimension.width)}/${String(dimension.height)}`
 }
 
 // === Generic Remote Data ===
@@ -218,7 +201,7 @@ function useApp(): [State, Dispatch] {
         return { ...state, selectedImage: undefined }
       }
       default:
-        return assertNever(msg)
+        return msg satisfies never
     }
   }
 
@@ -254,10 +237,10 @@ function imageGridStyle(dimension: Dimension) {
   return {
     display: "grid",
     gridTemplateColumns: {
-      xs: `repeat(2, ${dimension.width}px)`,
+      xs: `repeat(2, ${String(dimension.width)}px)`,
-      md: `repeat(5, ${dimension.width}px)`,
+      md: `repeat(5, ${String(dimension.width)}px)`,
     },
-    gridAutoRows: `${dimension.height}px`,
+    gridAutoRows: `${String(dimension.height)}px`,
     gap: 2,
   }
 }
@@ -287,7 +270,9 @@ function Images({ images }: { images: ImageId[] }) {
         <Box
           component="img"
           src={getImageSource(imageId, Dimension.medium)}
-          onClick={() => dispatch({ tag: "imageClicked", imageId })}
+          onClick={() => {
+            dispatch({ tag: "imageClicked", imageId })
+          }}
           sx={{
             width: Dimension.medium.width,
             height: Dimension.medium.height,
@@ -307,7 +292,9 @@ function ImageModal({ selectedImage }: { selectedImage: ImageId | undefined }) {
   return (
     <Dialog
       open={selectedImage !== undefined}
-      onClose={() => dispatch({ tag: "modalCloseButtonClicked" })}
+      onClose={() => {
+        dispatch({ tag: "modalCloseButtonClicked" })
+      }}
       maxWidth={false}
     >
       <DialogContent sx={{ p: 0, overflow: "hidden" }}>
@@ -359,7 +346,9 @@ export default function App() {
             }}
           >
             <Button
-              onClick={() => dispatch({ tag: "previousButtonClicked" })}
+              onClick={() => {
+                dispatch({ tag: "previousButtonClicked" })
+              }}
               disabled={Page.isFirst(state.page)}
             >
               prev
@@ -374,7 +363,13 @@ export default function App() {
             >
               {state.page.page}
             </Typography>
-            <Button onClick={() => dispatch({ tag: "nextButtonClicked" })}>next</Button>
+            <Button
+              onClick={() => {
+                dispatch({ tag: "nextButtonClicked" })
+              }}
+            >
+              next
+            </Button>
           </Box>
         </Box>