84 lines
2.6 KiB
JavaScript
84 lines
2.6 KiB
JavaScript
import loaderUtils from 'next/dist/compiled/loader-utils3'
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import { resizeImage, getImageSize } from '../../../server/image-optimizer'
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const BLUR_IMG_SIZE = 8
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const BLUR_QUALITY = 70
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const VALID_BLUR_EXT = ['jpeg', 'png', 'webp', 'avif'] // should match next/client/image.tsx
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function nextImageLoader(content) {
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const imageLoaderSpan = this.currentTraceSpan.traceChild('next-image-loader')
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return imageLoaderSpan.traceAsyncFn(async () => {
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const { isServer, isDev, assetPrefix, basePath } = this.getOptions()
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const context = this.rootContext
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const opts = { context, content }
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const interpolatedName = loaderUtils.interpolateName(
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this,
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'/static/media/[name].[hash:8].[ext]',
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opts
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)
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const outputPath = assetPrefix + '/_next' + interpolatedName
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let extension = loaderUtils.interpolateName(this, '[ext]', opts)
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if (extension === 'jpg') {
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extension = 'jpeg'
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}
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const imageSizeSpan = imageLoaderSpan.traceChild('image-size-calculation')
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const imageSize = await imageSizeSpan.traceAsyncFn(() =>
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getImageSize(content, extension)
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)
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let blurDataURL
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if (VALID_BLUR_EXT.includes(extension)) {
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if (isDev) {
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const prefix = 'http://localhost'
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const url = new URL(`${basePath || ''}/_next/image`, prefix)
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url.searchParams.set('url', outputPath)
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url.searchParams.set('w', BLUR_IMG_SIZE)
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url.searchParams.set('q', BLUR_QUALITY)
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blurDataURL = url.href.slice(prefix.length)
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} else {
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// Shrink the image's largest dimension
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const dimension =
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imageSize.width >= imageSize.height ? 'width' : 'height'
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const resizeImageSpan = imageLoaderSpan.traceChild('image-resize')
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const resizedImage = await resizeImageSpan.traceAsyncFn(() =>
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resizeImage(
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content,
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dimension,
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BLUR_IMG_SIZE,
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extension,
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BLUR_QUALITY
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)
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)
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const blurDataURLSpan = imageLoaderSpan.traceChild(
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'image-base64-tostring'
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)
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blurDataURL = blurDataURLSpan.traceFn(
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() =>
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`data:image/${extension};base64,${resizedImage.toString('base64')}`
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)
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}
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}
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const stringifiedData = imageLoaderSpan
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.traceChild('image-data-stringify')
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.traceFn(() =>
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JSON.stringify({
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src: outputPath,
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height: imageSize.height,
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width: imageSize.width,
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blurDataURL,
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})
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)
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if (!isServer) {
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this.emitFile(interpolatedName, content, null)
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}
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return `export default ${stringifiedData};`
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})
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}
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export const raw = true
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export default nextImageLoader
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