Fix Image component defaults & remove autoOptimize (#18101)

packages/next/build/webpack-config.ts

@@ -994,7 +994,6 @@ export default async function getBaseWebpackConfig(
           sizes: config.images.sizes,
           path: config.images.path,
           loader: config.images.loader,
-          autoOptimize: config.images.autoOptimize,
         }),
         'process.env.__NEXT_ROUTER_BASEPATH': JSON.stringify(config.basePath),
         'process.env.__NEXT_HAS_REWRITES': JSON.stringify(hasRewrites),

packages/next/client/image.tsx

 import React, { ReactElement, useEffect, useRef } from 'react'
 import Head from '../next-server/lib/head'
 
-const loaders: { [key: string]: (props: LoaderProps) => string } = {
-  imgix: imgixLoader,
-  cloudinary: cloudinaryLoader,
-  akamai: akamaiLoader,
-  default: defaultLoader,
-}
+const loaders = new Map<LoaderKey, (props: LoaderProps) => string>([
+  ['imgix', imgixLoader],
+  ['cloudinary', cloudinaryLoader],
+  ['akamai', akamaiLoader]
+  ['default', defaultLoader],
+])
+
+type LoaderKey = 'imgix' | 'cloudinary' | 'akamai' | 'default'
 
 type ImageData = {
-  sizes?: number[]
-  loader?: string
-  path?: string
-  autoOptimize?: boolean
+  sizes: number[]
+  loader: LoaderKey
+  path: string
 }
 
 type ImageProps = Omit<
@@ -30,11 +31,7 @@ type ImageProps = Omit<
   )
 
 const imageData: ImageData = process.env.__NEXT_IMAGE_OPTS as any
-const breakpoints = imageData.sizes || [640, 1024, 1600]
-// Auto optimize defaults to on if not specified
-if (imageData.autoOptimize === undefined) {
-  imageData.autoOptimize = true
-}
+const { sizes: configSizes, loader: configLoader, path: configPath } = imageData
 
 let cachedObserver: IntersectionObserver
 const IntersectionObserver =
@@ -89,8 +86,8 @@ type CallLoaderProps = {
 }
 
 function callLoader(loaderProps: CallLoaderProps) {
-  let loader = loaders[imageData.loader || 'default']
-  return loader({ root: imageData.path || '/_next/image', ...loaderProps })
+  let load = loaders.get(configLoader) || defaultLoader
+  return load({ root: configPath, ...loaderProps })
 }
 
 type SrcSetData = {
@@ -187,7 +184,7 @@ export default function Image({
   const imgSrcSet = !unoptimized
     ? generateSrcSet({
         src,
-        widths: breakpoints,
+        widths: configSizes,
         quality,
       })
     : undefined
@@ -266,7 +263,7 @@ export default function Image({
       {shouldPreload
         ? generatePreload({
             src,
-            widths: breakpoints,
+            widths: configSizes,
             unoptimized,
             sizes,
           })
@@ -292,7 +289,7 @@ function normalizeSrc(src: string) {
 }
 
 function imgixLoader({ root, src, width, quality }: LoaderProps): string {
-  const params = []
+  const params = ['auto=format']
   let paramsString = ''
   if (width) {
     params.push('w=' + width)
@@ -300,9 +297,7 @@ function imgixLoader({ root, src, width, quality }: LoaderProps): string {
   if (quality) {
     params.push('q=' + quality)
   }
-  if (imageData.autoOptimize) {
-    params.push('auto=compress')
-  }
+
   if (params.length) {
     paramsString = '?' + params.join('&')
   }
@@ -314,11 +309,8 @@ function akamaiLoader({ root, src, width }: LoaderProps): string {
 }
 
 function cloudinaryLoader({ root, src, width, quality }: LoaderProps): string {
-  const params = []
+  const params = ['f_auto']
   let paramsString = ''
-  if (!quality && imageData.autoOptimize) {
-    quality = 'auto'
-  }
   if (width) {
     params.push('w_' + width)
   }

packages/next/next-server/server/config.ts

@@ -26,7 +26,8 @@ const defaultConfig: { [key: string]: any } = {
   images: {
     sizes: [320, 420, 768, 1024, 1200],
     domains: [],
-    hosts: { default: { path: '/_next/image' } },
+    path: '/_next/image',
+    loader: 'default',
   },
   devIndicators: {
     buildActivity: true,

test/integration/image-component/basic/next.config.js

 module.exports = {
   images: {
     sizes: [480, 1024, 1600],
-    autoOptimize: false,
     path: 'https://example.com/myaccount/',
     loader: 'imgix',
   },

test/integration/image-component/basic/test/index.test.js

@@ -33,26 +33,26 @@ function runTests() {
   })
   it('should modify src with the loader', async () => {
     expect(await browser.elementById('basic-image').getAttribute('src')).toBe(
-      'https://example.com/myaccount/foo.jpg?q=60'
+      'https://example.com/myaccount/foo.jpg?auto=format&q=60'
     )
   })
   it('should correctly generate src even if preceding slash is included in prop', async () => {
     expect(
       await browser.elementById('preceding-slash-image').getAttribute('src')
-    ).toBe('https://example.com/myaccount/fooslash.jpg')
+    ).toBe('https://example.com/myaccount/fooslash.jpg?auto=format')
   })
   it('should add a srcset based on the loader', async () => {
     expect(
       await browser.elementById('basic-image').getAttribute('srcset')
     ).toBe(
-      'https://example.com/myaccount/foo.jpg?w=480&q=60 480w, https://example.com/myaccount/foo.jpg?w=1024&q=60 1024w, https://example.com/myaccount/foo.jpg?w=1600&q=60 1600w'
+      'https://example.com/myaccount/foo.jpg?auto=format&w=480&q=60 480w, https://example.com/myaccount/foo.jpg?auto=format&w=1024&q=60 1024w, https://example.com/myaccount/foo.jpg?auto=format&w=1600&q=60 1600w'
     )
   })
   it('should add a srcset even with preceding slash in prop', async () => {
     expect(
       await browser.elementById('preceding-slash-image').getAttribute('srcset')
     ).toBe(
-      'https://example.com/myaccount/fooslash.jpg?w=480 480w, https://example.com/myaccount/fooslash.jpg?w=1024 1024w, https://example.com/myaccount/fooslash.jpg?w=1600 1600w'
+      'https://example.com/myaccount/fooslash.jpg?auto=format&w=480 480w, https://example.com/myaccount/fooslash.jpg?auto=format&w=1024 1024w, https://example.com/myaccount/fooslash.jpg?auto=format&w=1600 1600w'
     )
   })
   it('should support the unoptimized attribute', async () => {
@@ -70,10 +70,10 @@ function runTests() {
 function lazyLoadingTests() {
   it('should have loaded the first image immediately', async () => {
     expect(await browser.elementById('lazy-top').getAttribute('src')).toBe(
-      'https://example.com/myaccount/foo1.jpg'
+      'https://example.com/myaccount/foo1.jpg?auto=format'
     )
     expect(await browser.elementById('lazy-top').getAttribute('srcset')).toBe(
-      'https://example.com/myaccount/foo1.jpg?w=480 480w, https://example.com/myaccount/foo1.jpg?w=1024 1024w, https://example.com/myaccount/foo1.jpg?w=1600 1600w'
+      'https://example.com/myaccount/foo1.jpg?auto=format&w=480 480w, https://example.com/myaccount/foo1.jpg?auto=format&w=1024 1024w, https://example.com/myaccount/foo1.jpg?auto=format&w=1600 1600w'
     )
   })
   it('should not have loaded the second image immediately', async () => {
@@ -101,11 +101,11 @@ function lazyLoadingTests() {
 
     await check(() => {
       return browser.elementById('lazy-mid').getAttribute('src')
-    }, 'https://example.com/myaccount/foo2.jpg')
+    }, 'https://example.com/myaccount/foo2.jpg?auto=format')
 
     await check(() => {
       return browser.elementById('lazy-mid').getAttribute('srcset')
-    }, 'https://example.com/myaccount/foo2.jpg?w=480 480w, https://example.com/myaccount/foo2.jpg?w=1024 1024w, https://example.com/myaccount/foo2.jpg?w=1600 1600w')
+    }, 'https://example.com/myaccount/foo2.jpg?auto=format&w=480 480w, https://example.com/myaccount/foo2.jpg?auto=format&w=1024 1024w, https://example.com/myaccount/foo2.jpg?auto=format&w=1600 1600w')
   })
   it('should not have loaded the third image after scrolling down', async () => {
     expect(
@@ -166,14 +166,14 @@ describe('Image Component Tests', () => {
     it('should add a preload tag for a priority image', async () => {
       expect(
         await hasPreloadLinkMatchingUrl(
-          'https://example.com/myaccount/withpriority.png'
+          'https://example.com/myaccount/withpriority.png?auto=format'
         )
       ).toBe(true)
     })
     it('should add a preload tag for a priority image with preceding slash', async () => {
       expect(
         await hasPreloadLinkMatchingUrl(
-          'https://example.com/myaccount/fooslash.jpg'
+          'https://example.com/myaccount/fooslash.jpg?auto=format'
         )
       ).toBe(true)
     })
@@ -197,7 +197,7 @@ describe('Image Component Tests', () => {
     it('should NOT add a preload tag for a priority image', async () => {
       expect(
         await hasPreloadLinkMatchingUrl(
-          'https://example.com/myaccount/withpriorityclient.png'
+          'https://example.com/myaccount/withpriorityclient.png?auto=format'
         )
       ).toBe(false)
     })