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import type webpack from 'webpack'
import { getModuleBuildInfo } from './get-module-build-info'
import { stringifyRequest } from '../stringify-request'
import type { MiddlewareConfig } from '../../analysis/get-page-static-info'
export type EdgeFunctionLoaderOptions = {
absolutePagePath: string
page: string
rootDir: string
preferredRegion: string | string[] | undefined
middlewareConfig: string
}
const nextEdgeFunctionLoader: webpack.LoaderDefinitionFunction<EdgeFunctionLoaderOptions> =
function nextEdgeFunctionLoader(this) {
const {
absolutePagePath,
page,
rootDir,
preferredRegion,
middlewareConfig: middlewareConfigBase64,
}: EdgeFunctionLoaderOptions = this.getOptions()
const stringifiedPagePath = stringifyRequest(this, absolutePagePath)
const buildInfo = getModuleBuildInfo(this._module as any)
const middlewareConfig: MiddlewareConfig = JSON.parse(
Buffer.from(middlewareConfigBase64, 'base64').toString()
)
buildInfo.route = {
page: page || '/',
absolutePagePath,
preferredRegion,
middlewareConfig,
}
buildInfo.nextEdgeApiFunction = {
page: page || '/',
}
buildInfo.rootDir = rootDir
return `
import 'next/dist/esm/server/web/globals'
import { adapter } from 'next/dist/esm/server/web/adapter'
import { IncrementalCache } from 'next/dist/esm/server/lib/incremental-cache'
import { wrapApiHandler } from 'next/dist/esm/server/api-utils'
import handler from ${stringifiedPagePath}
if (typeof handler !== 'function') {
throw new Error('The Edge Function "pages${page}" must export a \`default\` function');
}
export default function nHandler (opts) {
return adapter({
...opts,
IncrementalCache,
page: ${JSON.stringify(page)},
handler: wrapApiHandler(${JSON.stringify(page)}, handler),
})
}
`
}
export default nextEdgeFunctionLoader
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