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fix(switchable-runtime): Make it possible to switch between edge and …
…server runtime in dev (#39327) Makes it possible to switch between edge/server runtime in dev without breaking the server. Fixes slack: [1](https://vercel.slack.com/archives/CGU8HUTUH/p1659082535540549) [2](https://vercel.slack.com/archives/C02CDC2ALJH/p1658978287244359) [3](https://vercel.slack.com/archives/C03KAR5DCKC/p1656869427468779) #### middleware-plugin.ts `middlewareManifest` moved from module scope to local scope. Stale state from earlier builds ended up in `middleware-manifest.json`. Functions that changed from edge to server runtime stayed in the manifest as edge functions. #### on-demand-entry-handler.ts When a server or edge entry is added we check if it has switched runtime. If that's the case the old entry is removed. #### Reproduce Create edge API route and visit `/api/hello` ```js // pages/api/hello.js export const config = { runtime: 'experimental-edge', } export default () => new Response('Hello') ``` Change it to a server api route and visit `/api/hello`, it will explode. ```js // pages/api/hello.js export default function (req, res) { res.send('Hello') } ``` #### Bug not fixed One EDGE case is not fixed. It occurs if you switch between edge and server runtime several times without changing the content of the file: Edge runtime ```js export const config = { runtime: 'experimental-edge', } export default () => new Response('Hello') ``` Change it to a server runtime ```js export default function (req, res) { res.send('Hello') } ``` Change back to edge runtime, the content of the file is the same as the first time we compiled the edge runtime version. ```js export const config = { runtime: 'experimental-edge', } export default () => new Response('Hello') ``` The reason is that both the edge and server compiler emits to the same file (/.next/server/pages/api/hello.js) which makes this check fail in webpack: https://github.com/webpack/webpack/blob/main/lib/Compiler.js#L849-L861 Possible solution is to use different output folders for edge and server https://vercel.slack.com/archives/CGU8HUTUH/p1661163106667559 Co-authored-by: JJ Kasper <jj@jjsweb.site>
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test/e2e/switchable-runtime/pages/api/switch-in-dev-same-content.js
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Original file line number | Diff line number | Diff line change |
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export default (req, res) => { | ||
res.send('server response') | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,3 @@ | ||
export default (req, res) => { | ||
res.send('server response') | ||
} |
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export default () => new Response('edge response') | ||
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export const config = { | ||
runtime: `experimental-edge`, | ||
} |
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export default function Page() { | ||
return <p>Hello from edge page</p> | ||
} | ||
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export const config = { | ||
runtime: 'experimental-edge', | ||
} |