[Avatar] Fix img slot types and add missing slots

docs/data/material/customization/overriding-component-structure/overriding-component-structure.md

@@ -91,6 +91,34 @@ If both `slotProps.root` and additional props have the same keys but different v
 This does not apply to classes or the `style` prop—they will be merged instead.
 :::
 
+### Type safety
+
+The `slotProps` prop is not dynamically typed based on the custom `slots` prop, so if the custom slot has a different type than the default slot, you have to cast the type to avoid TypeScript errors and use `satisfies` (available in TypeScript 4.9) to ensure type safety for the custom slot.
+
+The example below shows how to customize the `img` slot of the [Avatar](/material-ui/react-avatar/) component using [Next.js Image](https://nextjs.org/docs/app/api-reference/components/image) component:
+
+```tsx
+import Image, { ImageProps } from 'next/image';
+import Avatar, { AvatarProps } from '@mui/material/Avatar';
+
+<Avatar
+  slots={{
+    img: Image,
+  }}
+  slotProps={
+    {
+      img: {
+        src: 'https://example.com/image.jpg',
+        alt: 'Image',
+        width: 40,
+        height: 40,
+        blurDataURL: 'data:image/png;base64',
+      } satisfies ImageProps,
+    } as AvatarProps['slotProps']
+  }
+/>;
+```
+
 ## Best practices
 
 Use the `component` or `slotProps.{slot}.component` prop when you need to override the element while preserving the styles of the slot.

docs/pages/material-ui/api/avatar.json

@@ -11,11 +11,17 @@
     },
     "sizes": { "type": { "name": "string" } },
     "slotProps": {
-      "type": { "name": "shape", "description": "{ img?: func<br>&#124;&nbsp;object }" },
+      "type": {
+        "name": "shape",
+        "description": "{ fallback?: func<br>&#124;&nbsp;object, img?: func<br>&#124;&nbsp;object, root?: func<br>&#124;&nbsp;object }"
+      },
       "default": "{}"
     },
     "slots": {
-      "type": { "name": "shape", "description": "{ img?: elementType }" },
+      "type": {
+        "name": "shape",
+        "description": "{ fallback?: elementType, img?: elementType, root?: elementType }"
+      },
       "default": "{}"
     },
     "src": { "type": { "name": "string" } },
@@ -41,11 +47,23 @@
     "import { Avatar } from '@mui/material';"
   ],
   "slots": [
+    {
+      "name": "root",
+      "description": "The component that renders the root slot.",
+      "default": "'div'",
+      "class": "MuiAvatar-root"
+    },
     {
       "name": "img",
-      "description": "The component that renders the transition.\n[Follow this guide](https://mui.com/material-ui/transitions/#transitioncomponent-prop) to learn more about the requirements for this component.",
-      "default": "Collapse",
+      "description": "The component that renders the img slot.",
+      "default": "'img'",
       "class": "MuiAvatar-img"
+    },
+    {
+      "name": "fallback",
+      "description": "The component that renders the fallback slot.",
+      "default": "Person icon",
+      "class": "MuiAvatar-fallback"
     }
   ],
   "classes": [
@@ -61,18 +79,6 @@
       "description": "Styles applied to the root element if not `src` or `srcSet`.",
       "isGlobal": false
     },
-    {
-      "key": "fallback",
-      "className": "MuiAvatar-fallback",
-      "description": "Styles applied to the fallback icon",
-      "isGlobal": false
-    },
-    {
-      "key": "root",
-      "className": "MuiAvatar-root",
-      "description": "Styles applied to the root element.",
-      "isGlobal": false
-    },
     {
       "key": "rounded",
       "className": "MuiAvatar-rounded",

docs/translations/api-docs/avatar/avatar.json

@@ -39,8 +39,6 @@
       "nodeName": "the root element",
       "conditions": "not <code>src</code> or <code>srcSet</code>"
     },
-    "fallback": { "description": "Styles applied to the fallback icon" },
-    "root": { "description": "Styles applied to the root element." },
     "rounded": {
       "description": "Styles applied to {{nodeName}} if {{conditions}}.",
       "nodeName": "the root element",
@@ -53,6 +51,8 @@
     }
   },
   "slotDescriptions": {
-    "img": "The component that renders the transition. <a href=\"https://mui.com/material-ui/transitions/#transitioncomponent-prop\">Follow this guide</a> to learn more about the requirements for this component."
+    "fallback": "The component that renders the fallback slot.",
+    "img": "The component that renders the img slot.",
+    "root": "The component that renders the root slot."
   }
 }

packages/mui-material/src/Avatar/Avatar.d.ts

@@ -5,24 +5,52 @@ import { Theme } from '../styles';
 import { OverridableComponent, OverrideProps } from '../OverridableComponent';
 import { AvatarClasses } from './avatarClasses';
 import { CreateSlotsAndSlotProps, SlotProps } from '../utils/types';
+import { SvgIconProps } from '../SvgIcon';
 
 export interface AvatarSlots {
   /**
-   * The component that renders the transition.
-   * [Follow this guide](https://mui.com/material-ui/transitions/#transitioncomponent-prop) to learn more about the requirements for this component.
-   * @default Collapse
+   * The component that renders the root slot.
+   * @default 'div'
    */
-  img: React.JSXElementConstructor<React.ImgHTMLAttributes<HTMLImageElement>>;
+  root: React.ElementType;
+  /**
+   * The component that renders the img slot.
+   * @default 'img'
+   */
+  img: React.ElementType;
+  /**
+   * The component that renders the fallback slot.
+   * @default Person icon
+   */
+  fallback: React.ElementType;
 }
 
 export interface AvatarPropsVariantOverrides {}
 
+export interface AvatarRootSlotPropsOverrides {}
+export interface AvatarImgSlotPropsOverrides {}
+export interface AvatarFallbackSlotPropsOverrides {}
+
 export type AvatarSlotsAndSlotProps = CreateSlotsAndSlotProps<
   AvatarSlots,
   {
-    img: SlotProps<
-      React.ElementType<React.ImgHTMLAttributes<HTMLImageElement>>,
-      {},
+    /**
+     * Props forwarded to the root slot.
+     * By default, the avaible props are based on the div element.
+     */
+    root: SlotProps<'div', AvatarRootSlotPropsOverrides, AvatarOwnProps>;
+    /**
+     * Props forwarded to the img slot.
+     * By default, the avaible props are based on the img element.
+     */
+    img: SlotProps<'img', AvatarImgSlotPropsOverrides, AvatarOwnProps>;
+    /**
+     * Props forwarded to the fallback slot.
+     * By default, the avaible props are based on the [SvgIcon](https://mui.com/material-ui/api/svg-icon/#props) component.
+     */
+    fallback: SlotProps<
+      React.ElementType<SvgIconProps>,
+      AvatarFallbackSlotPropsOverrides,
       AvatarOwnProps
     >;
   }

packages/mui-material/src/Avatar/Avatar.js

@@ -185,6 +185,19 @@ const Avatar = React.forwardRef(function Avatar(inProps, ref) {
 
   const classes = useUtilityClasses(ownerState);
 
+  const [RootSlot, rootSlotProps] = useSlot('root', {
+    ref,
+    className: clsx(classes.root, className),
+    elementType: AvatarRoot,
+    externalForwardedProps: {
+      slots,
+      slotProps,
+      component,
+      ...other,
+    },
+    ownerState,
+  });
+
   const [ImgSlot, imgSlotProps] = useSlot('img', {
     className: classes.img,
     elementType: AvatarImg,
@@ -196,6 +209,17 @@ const Avatar = React.forwardRef(function Avatar(inProps, ref) {
     ownerState,
   });
 
+  const [FallbackSlot, fallbackSlotProps] = useSlot('fallback', {
+    className: classes.fallback,
+    elementType: AvatarFallback,
+    externalForwardedProps: {
+      slots,
+      slotProps,
+    },
+    shouldForwardComponentProp: true,
+    ownerState,
+  });
+
   if (hasImgNotFailing) {
     children = <ImgSlot {...imgSlotProps} />;
     // We only render valid children, non valid children are rendered with a fallback
@@ -205,20 +229,10 @@ const Avatar = React.forwardRef(function Avatar(inProps, ref) {
   } else if (hasImg && alt) {
     children = alt[0];
   } else {
-    children = <AvatarFallback ownerState={ownerState} className={classes.fallback} />;
+    children = <FallbackSlot {...fallbackSlotProps} />;
   }
 
-  return (
-    <AvatarRoot
-      as={component}
-      className={clsx(classes.root, className)}
-      ref={ref}
-      {...other}
-      ownerState={ownerState}
-    >
-      {children}
-    </AvatarRoot>
-  );
+  return <RootSlot {...rootSlotProps}>{children}</RootSlot>;
 });
 
 Avatar.propTypes /* remove-proptypes */ = {
@@ -264,14 +278,18 @@ Avatar.propTypes /* remove-proptypes */ = {
    * @default {}
    */
   slotProps: PropTypes.shape({
+    fallback: PropTypes.oneOfType([PropTypes.func, PropTypes.object]),
     img: PropTypes.oneOfType([PropTypes.func, PropTypes.object]),
+    root: PropTypes.oneOfType([PropTypes.func, PropTypes.object]),
   }),
   /**
    * The components used for each slot inside.
    * @default {}
    */
   slots: PropTypes.shape({
+    fallback: PropTypes.elementType,
     img: PropTypes.elementType,
+    root: PropTypes.elementType,
   }),
   /**
    * The `src` attribute for the `img` element.

packages/mui-material/src/Avatar/Avatar.spec.tsx

@@ -10,3 +10,58 @@ function CustomImg() {
 }
 <Avatar slotProps={{ img: { alt: '' } }} />;
 <Avatar slots={{ img: CustomImg }} />;
+
+// Next.js Image component
+interface StaticImageData {
+  src: string;
+  height: number;
+  width: number;
+  blurDataURL?: string;
+  blurWidth?: number;
+  blurHeight?: number;
+}
+interface StaticRequire {
+  default: StaticImageData;
+}
+type StaticImport = StaticRequire | StaticImageData;
+
+type ImageLoaderProps = {
+  src: string;
+  width: number;
+  quality?: number;
+};
+
+type ImageLoader = (p: ImageLoaderProps) => string;
+
+type PlaceholderValue = 'blur' | 'empty' | `data:image/${string}`;
+
+type OnLoadingComplete = (img: HTMLImageElement) => void;
+
+declare const Image: React.ForwardRefExoticComponent<
+  Omit<
+    React.DetailedHTMLProps<React.ImgHTMLAttributes<HTMLImageElement>, HTMLImageElement>,
+    'height' | 'width' | 'loading' | 'ref' | 'alt' | 'src' | 'srcSet'
+  > & {
+    src: string | StaticImport;
+    alt: string;
+    width?: number | `${number}`;
+    height?: number | `${number}`;
+    fill?: boolean;
+    loader?: ImageLoader;
+    quality?: number | `${number}`;
+    priority?: boolean;
+    loading?: 'eager' | 'lazy' | undefined;
+    placeholder?: PlaceholderValue;
+    blurDataURL?: string;
+    unoptimized?: boolean;
+    overrideSrc?: string;
+    onLoadingComplete?: OnLoadingComplete;
+    layout?: string;
+    objectFit?: string;
+    objectPosition?: string;
+    lazyBoundary?: string;
+    lazyRoot?: string;
+  } & React.RefAttributes<HTMLImageElement | null>
+>;
+
+<Avatar slots={{ img: Image }} />;

packages/mui-material/src/Avatar/Avatar.test.js

@@ -20,6 +20,14 @@ describe('<Avatar />', () => {
     testDeepOverrides: { slotName: 'fallback', slotClassName: classes.fallback },
     testVariantProps: { variant: 'foo' },
     testStateOverrides: { prop: 'variant', value: 'rounded', styleKey: 'rounded' },
+    slots: {
+      root: {
+        expectedClassName: classes.root,
+      },
+      fallback: {
+        expectedClassName: classes.fallback,
+      },
+    },
     skip: ['componentsProp'],
   }));