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import type { CompilerNameValues } from '../../../../shared/lib/constants'
import path from 'path'
import loaderUtils from 'next/dist/compiled/loader-utils3'
import { getImageSize } from '../../../../server/image-optimizer'
import { getBlurImage } from './blur'
interface Options {
compilerType: CompilerNameValues
isDev: boolean
assetPrefix: string
basePath: string
}
function nextImageLoader(this: any, content: Buffer) {
const imageLoaderSpan = this.currentTraceSpan.traceChild('next-image-loader')
return imageLoaderSpan.traceAsyncFn(async () => {
const options: Options = this.getOptions()
const { compilerType, isDev, assetPrefix, basePath } = options
const context = this.rootContext
const opts = { context, content }
const interpolatedName = loaderUtils.interpolateName(
this,
'/static/media/[name].[hash:8].[ext]',
opts
)
const outputPath = assetPrefix + '/_next' + interpolatedName
let extension = loaderUtils.interpolateName(this, '[ext]', opts)
if (extension === 'jpg') {
extension = 'jpeg'
}
const imageSizeSpan = imageLoaderSpan.traceChild('image-size-calculation')
const imageSize = await imageSizeSpan.traceAsyncFn(() =>
getImageSize(content).catch((err) => err)
)
if (imageSize instanceof Error) {
const err = imageSize
err.name = 'InvalidImageFormatError'
throw err
}
const {
dataURL: blurDataURL,
width: blurWidth,
height: blurHeight,
} = await getBlurImage(content, extension, imageSize, {
basePath,
outputPath,
isDev,
tracing: imageLoaderSpan.traceChild.bind(imageLoaderSpan),
})
const stringifiedData = imageLoaderSpan
.traceChild('image-data-stringify')
.traceFn(() =>
JSON.stringify({
src: outputPath,
height: imageSize.height,
width: imageSize.width,
blurDataURL,
blurWidth,
blurHeight,
})
)
if (compilerType === 'client') {
this.emitFile(interpolatedName, content, null)
} else {
this.emitFile(
path.join(
'..',
isDev || compilerType === 'edge-server' ? '' : '..',
interpolatedName
),
content,
null
)
}
return `export default ${stringifiedData};`
})
}
export const raw = true
export default nextImageLoader
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