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fix: support named & default export for middleware in ntl dev #2116

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Merged
merged 7 commits into from
May 17, 2023
Merged

fix: support named & default export for middleware in ntl dev #2116

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fadac14
fix: support named & default export for middleware in ntl dev
LekoArts May 16, 2023
086a8d6
chore: linting
LekoArts May 16, 2023
7d53878
chore: add typing
LekoArts May 16, 2023
2ef5b0b
Merge branch 'main' into ntl-dev-middleware-exports
LekoArts May 16, 2023
71eb682
fix: more verbose
LekoArts May 17, 2023
60ef41f
chore: formatting
LekoArts May 17, 2023
39c106f
Merge branch 'main' into ntl-dev-middleware-exports
LekoArts May 17, 2023
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2 changes: 2 additions & 0 deletions packages/runtime/src/templates/edge-shared/utils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -305,3 +305,5 @@ export const redirectTrailingSlash = (url: URL, trailingSlash: boolean): Respons
return Response.redirect(url, 308)
}
}

export const isFunction = (f: unknown) => Boolean(f) && typeof f === 'function'
14 changes: 12 additions & 2 deletions packages/runtime/src/templates/edge/next-dev.js
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import { NextRequest } from 'https://esm.sh/v91/next@12.2.5/deno/dist/server/web/spec-extension/request.js'
import { NextResponse } from 'https://esm.sh/v91/next@12.2.5/deno/dist/server/web/spec-extension/response.js'
import { fromFileUrl } from 'https://deno.land/std@0.151.0/path/mod.ts'
import { buildResponse } from '../edge-shared/utils.ts'
import { buildResponse, isFunction } from '../edge-shared/utils.ts'

globalThis.NFRequestContextMap ||= new Map()
globalThis.__dirname = fromFileUrl(new URL('./', import.meta.url)).slice(0, -1)
Expand Down Expand Up @@ -36,7 +36,17 @@ const handler = async (req, context) => {
// We need to cache-bust the import because otherwise it will claim it
// doesn't exist if the user creates it after the server starts
const nextMiddleware = await import(`../../middleware.js#${++idx}`)
middleware = nextMiddleware.middleware

// The middleware file can export a named `middleware` export or a `default` export
middleware = isFunction(nextMiddleware.middleware)
? nextMiddleware.middleware
: isFunction(nextMiddleware.default)
? nextMiddleware.default
: undefined

if (!middleware) {
throw new Error('The middleware must export a `middleware` or a `default` function')
}
} catch (importError) {
if (importError.code === 'ERR_MODULE_NOT_FOUND' && importError.message.includes(`middleware.js`)) {
// No middleware, so we silently return
Expand Down