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backport: Only filter next config if experimental flag is enabled (#88733) #88772

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Merged
ijjk merged 1 commit into from
Jan 19, 2026
Merged

backport: Only filter next config if experimental flag is enabled (#88733) #88772

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8 changes: 6 additions & 2 deletions packages/next/src/build/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1852,11 +1852,15 @@ export default async function build(
}
}

// getNextConfigRuntime only filters if experimental.runtimeServerDeploymentId is true,
// but we unconditionally want to remove configFile for this manifest
let runtimeConfigWithoutFilePath = { ...runtimeConfig }
delete (runtimeConfigWithoutFilePath as NextConfigComplete).configFile

const serverFilesManifest: RequiredServerFilesManifest = {
version: 1,
config: {
...runtimeConfig,

...runtimeConfigWithoutFilePath,
...(ciEnvironment.hasNextSupport
? {
compress: false,
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5 changes: 5 additions & 0 deletions packages/next/src/server/config-shared.ts
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Expand Up @@ -1683,6 +1683,11 @@ export interface NextConfigRuntime {
export function getNextConfigRuntime(
config: NextConfigComplete | NextConfigRuntime
): NextConfigRuntime {
// This config filter is a breaking change, so only do it if experimental.runtimeServerDeploymentId is enabled
if (!config.experimental.runtimeServerDeploymentId) {
return config
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@vercel vercel bot Jan 19, 2026

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Suggested change
return config
const { configFile: _, ...configWithoutFile } = config as NextConfigComplete
return configWithoutFile as NextConfigRuntime

Type mismatch in getNextConfigRuntime: function returns NextConfigComplete with configFile property when runtimeServerDeploymentId is not enabled, violating the NextConfigRuntime return type contract

Fix on Vercel

}

let ex = config.experimental

type Requiredish<T> = {
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