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/**
* For server-side CSS imports, we need to ignore the actual module content but
* still trigger the hot-reloading diff mechanism. So here we put the content
* inside a comment.
*/
import crypto from 'crypto'
import type webpack from 'webpack'
type NextServerCSSLoaderOptions = {
cssModules: boolean
}
const NextServerCSSLoader: webpack.LoaderDefinitionFunction<NextServerCSSLoaderOptions> =
function (content) {
this.cacheable && this.cacheable()
const options = this.getOptions()
let isCSSModule = options.cssModules
// Only add the checksum during development.
if (process.env.NODE_ENV !== 'production') {
// This check is only for backwards compatibility.
// TODO: Remove this in the next major version (next 14)
if (isCSSModule === undefined) {
this.emitWarning(
new Error(
"No 'cssModules' option was found for the next-flight-css-loader plugin."
)
)
isCSSModule =
this.resourcePath.match(/\.module\.(css|sass|scss)$/) !== null
}
const checksum = crypto
.createHash('sha1')
.update(typeof content === 'string' ? Buffer.from(content) : content)
.digest()
.toString('hex')
.substring(0, 12)
if (isCSSModule) {
return `\
${content}
module.exports.__checksum = ${JSON.stringify(checksum)}
`
}
// Server CSS imports are always available for HMR, so we attach
// `module.hot.accept()` to the generated module.
const hmrCode = 'if (module.hot) { module.hot.accept() }'
return `\
export default ${JSON.stringify(checksum)}
${hmrCode}
`
}
return content
}
export default NextServerCSSLoader
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