d6105c9502
* Add delay to placeholder removal * Increase jest timeout for image tests * Use check instead of immediately expecting the result Co-authored-by: Tim Neutkens <timneutkens@me.com>
696 lines
19 KiB
TypeScript
696 lines
19 KiB
TypeScript
import React from 'react'
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import Head from '../next-server/lib/head'
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import { toBase64 } from '../next-server/lib/to-base-64'
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import {
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ImageConfig,
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imageConfigDefault,
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LoaderValue,
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VALID_LOADERS,
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} from '../next-server/server/image-config'
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import { useIntersection } from './use-intersection'
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if (typeof window === 'undefined') {
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;(global as any).__NEXT_IMAGE_IMPORTED = true
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}
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const VALID_LOADING_VALUES = ['lazy', 'eager', undefined] as const
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type LoadingValue = typeof VALID_LOADING_VALUES[number]
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export type ImageLoader = (resolverProps: ImageLoaderProps) => string
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export type ImageLoaderProps = {
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src: string
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width: number
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quality?: number
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}
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type DefaultImageLoaderProps = ImageLoaderProps & { root: string }
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const loaders = new Map<
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LoaderValue,
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(props: DefaultImageLoaderProps) => string
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>([
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['imgix', imgixLoader],
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['cloudinary', cloudinaryLoader],
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['akamai', akamaiLoader],
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['default', defaultLoader],
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])
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const VALID_LAYOUT_VALUES = [
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'fill',
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'fixed',
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'intrinsic',
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'responsive',
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undefined,
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] as const
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type LayoutValue = typeof VALID_LAYOUT_VALUES[number]
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type PlaceholderValue = 'blur' | 'empty'
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type ImgElementStyle = NonNullable<JSX.IntrinsicElements['img']['style']>
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interface StaticImageData {
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src: string
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height: number
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width: number
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placeholder?: string
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}
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interface StaticRequire {
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default: StaticImageData
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}
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type StaticImport = StaticRequire | StaticImageData
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function isStaticRequire(
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src: StaticRequire | StaticImageData
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): src is StaticRequire {
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return (src as StaticRequire).default !== undefined
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}
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function isStaticImageData(
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src: StaticRequire | StaticImageData
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): src is StaticImageData {
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return (src as StaticImageData).src !== undefined
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}
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function isStaticImport(src: string | StaticImport): src is StaticImport {
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return (
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typeof src === 'object' &&
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(isStaticRequire(src as StaticImport) ||
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isStaticImageData(src as StaticImport))
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)
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}
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type StringImageProps = {
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src: string
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} & (
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| { width?: never; height?: never; layout: 'fill' }
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| {
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width: number | string
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height: number | string
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layout?: Exclude<LayoutValue, 'fill'>
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}
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) &
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(
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| {
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placeholder?: Exclude<PlaceholderValue, 'blur'>
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blurDataURL?: never
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}
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| { placeholder: 'blur'; blurDataURL: string }
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)
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type ObjectImageProps = {
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src: StaticImport
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width?: number | string
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height?: number | string
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layout?: LayoutValue
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placeholder?: PlaceholderValue
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blurDataURL?: never
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}
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export type ImageProps = Omit<
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JSX.IntrinsicElements['img'],
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'src' | 'srcSet' | 'ref' | 'width' | 'height' | 'loading' | 'style'
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> & {
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loader?: ImageLoader
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quality?: number | string
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priority?: boolean
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loading?: LoadingValue
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unoptimized?: boolean
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objectFit?: ImgElementStyle['objectFit']
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objectPosition?: ImgElementStyle['objectPosition']
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} & (StringImageProps | ObjectImageProps)
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const {
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deviceSizes: configDeviceSizes,
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imageSizes: configImageSizes,
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loader: configLoader,
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path: configPath,
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domains: configDomains,
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} =
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((process.env.__NEXT_IMAGE_OPTS as any) as ImageConfig) || imageConfigDefault
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// sort smallest to largest
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const allSizes = [...configDeviceSizes, ...configImageSizes]
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configDeviceSizes.sort((a, b) => a - b)
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allSizes.sort((a, b) => a - b)
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function getWidths(
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width: number | undefined,
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layout: LayoutValue,
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sizes: string | undefined
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): { widths: number[]; kind: 'w' | 'x' } {
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if (sizes && (layout === 'fill' || layout === 'responsive')) {
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// Find all the "vw" percent sizes used in the sizes prop
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const viewportWidthRe = /(^|\s)(1?\d?\d)vw/g
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const percentSizes = []
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for (let match; (match = viewportWidthRe.exec(sizes)); match) {
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percentSizes.push(parseInt(match[2]))
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}
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if (percentSizes.length) {
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const smallestRatio = Math.min(...percentSizes) * 0.01
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return {
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widths: allSizes.filter(
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(s) => s >= configDeviceSizes[0] * smallestRatio
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),
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kind: 'w',
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}
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}
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return { widths: allSizes, kind: 'w' }
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}
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if (
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typeof width !== 'number' ||
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layout === 'fill' ||
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layout === 'responsive'
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) {
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return { widths: configDeviceSizes, kind: 'w' }
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}
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const widths = [
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...new Set(
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// > This means that most OLED screens that say they are 3x resolution,
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// > are actually 3x in the green color, but only 1.5x in the red and
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// > blue colors. Showing a 3x resolution image in the app vs a 2x
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// > resolution image will be visually the same, though the 3x image
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// > takes significantly more data. Even true 3x resolution screens are
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// > wasteful as the human eye cannot see that level of detail without
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// > something like a magnifying glass.
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// https://blog.twitter.com/engineering/en_us/topics/infrastructure/2019/capping-image-fidelity-on-ultra-high-resolution-devices.html
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[width, width * 2 /*, width * 3*/].map(
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(w) => allSizes.find((p) => p >= w) || allSizes[allSizes.length - 1]
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)
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),
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]
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return { widths, kind: 'x' }
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}
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type GenImgAttrsData = {
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src: string
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unoptimized: boolean
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layout: LayoutValue
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loader: ImageLoader
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width?: number
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quality?: number
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sizes?: string
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}
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type GenImgAttrsResult = {
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src: string
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srcSet: string | undefined
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sizes: string | undefined
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}
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function generateImgAttrs({
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src,
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unoptimized,
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layout,
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width,
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quality,
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sizes,
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loader,
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}: GenImgAttrsData): GenImgAttrsResult {
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if (unoptimized) {
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return { src, srcSet: undefined, sizes: undefined }
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}
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const { widths, kind } = getWidths(width, layout, sizes)
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const last = widths.length - 1
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return {
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sizes: !sizes && kind === 'w' ? '100vw' : sizes,
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srcSet: widths
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.map(
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(w, i) =>
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`${loader({ src, quality, width: w })} ${
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kind === 'w' ? w : i + 1
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}${kind}`
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)
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.join(', '),
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// It's intended to keep `src` the last attribute because React updates
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// attributes in order. If we keep `src` the first one, Safari will
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// immediately start to fetch `src`, before `sizes` and `srcSet` are even
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// updated by React. That causes multiple unnecessary requests if `srcSet`
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// and `sizes` are defined.
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// This bug cannot be reproduced in Chrome or Firefox.
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src: loader({ src, quality, width: widths[last] }),
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}
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}
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function getInt(x: unknown): number | undefined {
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if (typeof x === 'number') {
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return x
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}
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if (typeof x === 'string') {
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return parseInt(x, 10)
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}
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return undefined
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}
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function defaultImageLoader(loaderProps: ImageLoaderProps) {
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const load = loaders.get(configLoader)
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if (load) {
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return load({ root: configPath, ...loaderProps })
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}
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throw new Error(
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`Unknown "loader" found in "next.config.js". Expected: ${VALID_LOADERS.join(
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', '
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)}. Received: ${configLoader}`
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)
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}
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// See https://stackoverflow.com/q/39777833/266535 for why we use this ref
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// handler instead of the img's onLoad attribute.
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// 1500ms delay in removing placeholder is to prevent flash of white between
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// image load and image render.
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function removePlaceholder(
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element: HTMLImageElement | null,
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placeholder: PlaceholderValue
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) {
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if (placeholder === 'blur' && element) {
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if (element.complete && !element.src.startsWith('data:')) {
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// If the real image fails to load, this will still remove the placeholder.
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// This is the desired behavior for now, and will be revisited when error
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// handling is worked on for the image component itself.
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setTimeout(() => {
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element.style.backgroundImage = 'none'
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}, 1500)
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} else {
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element.onload = () => {
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if (!element.src.startsWith('data:')) {
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setTimeout(() => {
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element.style.backgroundImage = 'none'
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}, 1500)
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}
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}
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}
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}
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}
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export default function Image({
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src,
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sizes,
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unoptimized = false,
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priority = false,
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loading,
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className,
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quality,
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width,
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height,
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objectFit,
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objectPosition,
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loader = defaultImageLoader,
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placeholder = 'empty',
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blurDataURL,
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...all
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}: ImageProps) {
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let rest: Partial<ImageProps> = all
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let layout: NonNullable<LayoutValue> = sizes ? 'responsive' : 'intrinsic'
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if ('layout' in rest) {
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// Override default layout if the user specified one:
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if (rest.layout) layout = rest.layout
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// Remove property so it's not spread into image:
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delete rest['layout']
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}
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let staticSrc = ''
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if (isStaticImport(src)) {
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const staticImageData = isStaticRequire(src) ? src.default : src
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if (!staticImageData.src) {
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throw new Error(
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`An object should only be passed to the image component src parameter if it comes from a static image import. It must include src. Received ${JSON.stringify(
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staticImageData
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)}`
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)
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}
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if (staticImageData.placeholder) {
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blurDataURL = staticImageData.placeholder
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}
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staticSrc = staticImageData.src
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if (!layout || layout !== 'fill') {
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height = height || staticImageData.height
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width = width || staticImageData.width
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if (!staticImageData.height || !staticImageData.width) {
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throw new Error(
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`An object should only be passed to the image component src parameter if it comes from a static image import. It must include height and width. Received ${JSON.stringify(
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staticImageData
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)}`
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)
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}
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}
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}
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src = typeof src === 'string' ? src : staticSrc
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if (process.env.NODE_ENV !== 'production') {
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if (!src) {
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throw new Error(
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`Image is missing required "src" property. Make sure you pass "src" in props to the \`next/image\` component. Received: ${JSON.stringify(
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{ width, height, quality }
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)}`
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)
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}
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if (!VALID_LAYOUT_VALUES.includes(layout)) {
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throw new Error(
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`Image with src "${src}" has invalid "layout" property. Provided "${layout}" should be one of ${VALID_LAYOUT_VALUES.map(
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String
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).join(',')}.`
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)
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}
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if (!VALID_LOADING_VALUES.includes(loading)) {
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throw new Error(
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`Image with src "${src}" has invalid "loading" property. Provided "${loading}" should be one of ${VALID_LOADING_VALUES.map(
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String
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).join(',')}.`
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)
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}
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if (priority && loading === 'lazy') {
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throw new Error(
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`Image with src "${src}" has both "priority" and "loading='lazy'" properties. Only one should be used.`
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)
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}
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}
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let isLazy =
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!priority && (loading === 'lazy' || typeof loading === 'undefined')
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if (src && src.startsWith('data:')) {
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs
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unoptimized = true
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isLazy = false
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}
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const [setRef, isIntersected] = useIntersection<HTMLImageElement>({
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rootMargin: '200px',
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disabled: !isLazy,
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})
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const isVisible = !isLazy || isIntersected
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const widthInt = getInt(width)
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const heightInt = getInt(height)
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const qualityInt = getInt(quality)
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const MIN_IMG_SIZE_FOR_PLACEHOLDER = 5000
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const tooSmallForBlurryPlaceholder =
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widthInt && heightInt && widthInt * heightInt < MIN_IMG_SIZE_FOR_PLACEHOLDER
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const shouldShowBlurryPlaceholder =
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placeholder === 'blur' && !tooSmallForBlurryPlaceholder
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let wrapperStyle: JSX.IntrinsicElements['div']['style'] | undefined
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let sizerStyle: JSX.IntrinsicElements['div']['style'] | undefined
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let sizerSvg: string | undefined
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let imgStyle: ImgElementStyle | undefined = {
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position: 'absolute',
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top: 0,
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left: 0,
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bottom: 0,
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right: 0,
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boxSizing: 'border-box',
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padding: 0,
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border: 'none',
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margin: 'auto',
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display: 'block',
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width: 0,
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height: 0,
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minWidth: '100%',
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maxWidth: '100%',
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minHeight: '100%',
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maxHeight: '100%',
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objectFit,
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objectPosition,
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...(shouldShowBlurryPlaceholder
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? {
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backgroundSize: 'cover',
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backgroundImage: `url("${blurDataURL}")`,
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}
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: undefined),
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}
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if (
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typeof widthInt !== 'undefined' &&
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typeof heightInt !== 'undefined' &&
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layout !== 'fill'
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) {
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// <Image src="i.png" width="100" height="100" />
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const quotient = heightInt / widthInt
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const paddingTop = isNaN(quotient) ? '100%' : `${quotient * 100}%`
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if (layout === 'responsive') {
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// <Image src="i.png" width="100" height="100" layout="responsive" />
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wrapperStyle = {
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display: 'block',
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overflow: 'hidden',
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position: 'relative',
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boxSizing: 'border-box',
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margin: 0,
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}
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sizerStyle = { display: 'block', boxSizing: 'border-box', paddingTop }
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} else if (layout === 'intrinsic') {
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// <Image src="i.png" width="100" height="100" layout="intrinsic" />
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wrapperStyle = {
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display: 'inline-block',
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maxWidth: '100%',
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overflow: 'hidden',
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position: 'relative',
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boxSizing: 'border-box',
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margin: 0,
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}
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sizerStyle = {
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boxSizing: 'border-box',
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display: 'block',
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maxWidth: '100%',
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}
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sizerSvg = `<svg width="${widthInt}" height="${heightInt}" xmlns="http://www.w3.org/2000/svg" version="1.1"/>`
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} else if (layout === 'fixed') {
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// <Image src="i.png" width="100" height="100" layout="fixed" />
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wrapperStyle = {
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overflow: 'hidden',
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boxSizing: 'border-box',
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display: 'inline-block',
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position: 'relative',
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width: widthInt,
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height: heightInt,
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}
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}
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} else if (
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typeof widthInt === 'undefined' &&
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typeof heightInt === 'undefined' &&
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layout === 'fill'
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) {
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// <Image src="i.png" layout="fill" />
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wrapperStyle = {
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display: 'block',
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overflow: 'hidden',
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position: 'absolute',
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top: 0,
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left: 0,
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bottom: 0,
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right: 0,
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boxSizing: 'border-box',
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margin: 0,
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}
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} else {
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// <Image src="i.png" />
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if (process.env.NODE_ENV !== 'production') {
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throw new Error(
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`Image with src "${src}" must use "width" and "height" properties or "layout='fill'" property.`
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)
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}
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}
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|
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let imgAttributes: GenImgAttrsResult = {
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src:
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'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7',
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srcSet: undefined,
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sizes: undefined,
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}
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if (isVisible) {
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imgAttributes = generateImgAttrs({
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src,
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unoptimized,
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layout,
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width: widthInt,
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quality: qualityInt,
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sizes,
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loader,
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})
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}
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return (
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<div style={wrapperStyle}>
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{sizerStyle ? (
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<div style={sizerStyle}>
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{sizerSvg ? (
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<img
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style={{
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maxWidth: '100%',
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display: 'block',
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margin: 0,
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border: 'none',
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padding: 0,
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}}
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alt=""
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aria-hidden={true}
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role="presentation"
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src={`data:image/svg+xml;base64,${toBase64(sizerSvg)}`}
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/>
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) : null}
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</div>
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) : null}
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{!isVisible && (
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<noscript>
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<img
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{...rest}
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{...generateImgAttrs({
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src,
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unoptimized,
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layout,
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width: widthInt,
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quality: qualityInt,
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sizes,
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loader,
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})}
|
|
src={src}
|
|
decoding="async"
|
|
sizes={sizes}
|
|
style={imgStyle}
|
|
className={className}
|
|
/>
|
|
</noscript>
|
|
)}
|
|
<img
|
|
{...rest}
|
|
{...imgAttributes}
|
|
decoding="async"
|
|
className={className}
|
|
ref={(element) => {
|
|
setRef(element)
|
|
removePlaceholder(element, placeholder)
|
|
}}
|
|
style={imgStyle}
|
|
/>
|
|
{priority ? (
|
|
// Note how we omit the `href` attribute, as it would only be relevant
|
|
// for browsers that do not support `imagesrcset`, and in those cases
|
|
// it would likely cause the incorrect image to be preloaded.
|
|
//
|
|
// https://html.spec.whatwg.org/multipage/semantics.html#attr-link-imagesrcset
|
|
<Head>
|
|
<link
|
|
key={
|
|
'__nimg-' +
|
|
imgAttributes.src +
|
|
imgAttributes.srcSet +
|
|
imgAttributes.sizes
|
|
}
|
|
rel="preload"
|
|
as="image"
|
|
href={imgAttributes.srcSet ? undefined : imgAttributes.src}
|
|
// @ts-ignore: imagesrcset is not yet in the link element type
|
|
imagesrcset={imgAttributes.srcSet}
|
|
// @ts-ignore: imagesizes is not yet in the link element type
|
|
imagesizes={imgAttributes.sizes}
|
|
></link>
|
|
</Head>
|
|
) : null}
|
|
</div>
|
|
)
|
|
}
|
|
|
|
//BUILT IN LOADERS
|
|
|
|
function normalizeSrc(src: string): string {
|
|
return src[0] === '/' ? src.slice(1) : src
|
|
}
|
|
|
|
function imgixLoader({
|
|
root,
|
|
src,
|
|
width,
|
|
quality,
|
|
}: DefaultImageLoaderProps): string {
|
|
// Demo: https://static.imgix.net/daisy.png?format=auto&fit=max&w=300
|
|
const params = ['auto=format', 'fit=max', 'w=' + width]
|
|
let paramsString = ''
|
|
if (quality) {
|
|
params.push('q=' + quality)
|
|
}
|
|
|
|
if (params.length) {
|
|
paramsString = '?' + params.join('&')
|
|
}
|
|
return `${root}${normalizeSrc(src)}${paramsString}`
|
|
}
|
|
|
|
function akamaiLoader({ root, src, width }: DefaultImageLoaderProps): string {
|
|
return `${root}${normalizeSrc(src)}?imwidth=${width}`
|
|
}
|
|
|
|
function cloudinaryLoader({
|
|
root,
|
|
src,
|
|
width,
|
|
quality,
|
|
}: DefaultImageLoaderProps): string {
|
|
// Demo: https://res.cloudinary.com/demo/image/upload/w_300,c_limit,q_auto/turtles.jpg
|
|
const params = ['f_auto', 'c_limit', 'w_' + width, 'q_' + (quality || 'auto')]
|
|
let paramsString = params.join(',') + '/'
|
|
return `${root}${paramsString}${normalizeSrc(src)}`
|
|
}
|
|
|
|
function defaultLoader({
|
|
root,
|
|
src,
|
|
width,
|
|
quality,
|
|
}: DefaultImageLoaderProps): string {
|
|
if (process.env.NODE_ENV !== 'production') {
|
|
const missingValues = []
|
|
|
|
// these should always be provided but make sure they are
|
|
if (!src) missingValues.push('src')
|
|
if (!width) missingValues.push('width')
|
|
|
|
if (missingValues.length > 0) {
|
|
throw new Error(
|
|
`Next Image Optimization requires ${missingValues.join(
|
|
', '
|
|
)} to be provided. Make sure you pass them as props to the \`next/image\` component. Received: ${JSON.stringify(
|
|
{ src, width, quality }
|
|
)}`
|
|
)
|
|
}
|
|
|
|
if (src.startsWith('//')) {
|
|
throw new Error(
|
|
`Failed to parse src "${src}" on \`next/image\`, protocol-relative URL (//) must be changed to an absolute URL (http:// or https://)`
|
|
)
|
|
}
|
|
|
|
if (!src.startsWith('/') && configDomains) {
|
|
let parsedSrc: URL
|
|
try {
|
|
parsedSrc = new URL(src)
|
|
} catch (err) {
|
|
console.error(err)
|
|
throw new Error(
|
|
`Failed to parse src "${src}" on \`next/image\`, if using relative image it must start with a leading slash "/" or be an absolute URL (http:// or https://)`
|
|
)
|
|
}
|
|
|
|
if (!configDomains.includes(parsedSrc.hostname)) {
|
|
throw new Error(
|
|
`Invalid src prop (${src}) on \`next/image\`, hostname "${parsedSrc.hostname}" is not configured under images in your \`next.config.js\`\n` +
|
|
`See more info: https://nextjs.org/docs/messages/next-image-unconfigured-host`
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
return `${root}?url=${encodeURIComponent(src)}&w=${width}&q=${quality || 75}`
|
|
}
|