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import type { EdgeFunctionDefinition } from '../../../build/webpack/plugins/middleware-plugin'
import { createReadStream, promises as fs } from 'fs'
import { requestToBodyStream } from '../../body-streams'
import { resolve } from 'path'
/**
* Short-circuits the `fetch` function
* to return a stream for a given asset, if a user used `new URL("file", import.meta.url)`.
* This allows to embed assets in Edge Runtime.
*/
export async function fetchInlineAsset(options: {
input: RequestInfo | URL
distDir: string
assets: EdgeFunctionDefinition['assets']
context: { Response: typeof Response; ReadableStream: typeof ReadableStream }
}): Promise<Response | undefined> {
const inputString = String(options.input)
if (!inputString.startsWith('blob:')) {
return
}
const name = inputString.replace('blob:', '')
const asset = options.assets
? options.assets.find((x) => x.name === name)
: {
name,
filePath: name,
}
if (!asset) {
return
}
const filePath = resolve(options.distDir, asset.filePath)
const fileIsReadable = await fs.access(filePath).then(
() => true,
() => false
)
if (fileIsReadable) {
const readStream = createReadStream(filePath)
return new options.context.Response(
requestToBodyStream(options.context, Uint8Array, readStream)
)
}
}
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