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just make it fail #84300

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wants to merge 2 commits into from
+8 −11
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just make it fail #84300

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65a1b26
just make it fail
lukesandberg Sep 26, 2025
dbe11ee
fix test
lukesandberg Sep 27, 2025
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19 changes: 8 additions & 11 deletions packages/next/src/lib/turbopack-warning.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -164,22 +164,19 @@ export async function validateTurboNextConfig({
// configuration. Otherwise the user explicitly picked turbopack and thus we expect that
// they have configured it correctly.
if (process.env.TURBOPACK === 'auto' && hasWebpackConfig && !hasTurboConfig) {
const logMethod = isDev ? Log.warn : Log.error
// In a production build with auto-detected Turbopack, we want to fail the build.
logMethod(
// If we defaulted to Turbopack, we want to fail the build to avoid surprising developers upgrading.
// This can be removed in a future release.
Log.error(
`Webpack is configured while Turbopack is not. This may be a mistake.`
)
logMethod(
`To configure Turbopack, see:\n https://nextjs.org/docs/app/api-reference/next-config-js/turbopack`
Log.error(
`To configure Turbopack, see https://nextjs.org/docs/app/api-reference/next-config-js/turbopack`
)
logMethod(
`TIP: Silence this ${isDev ? 'warning' : 'error'} by passing the --turbopack or --webpack flag explicitly.`
Log.error(
`TIP: Silence this by passing the --turbopack or --webpack flag explicitly.`
)

// For production builds we want to simply fail to prevent accidental misconfiguration.
if (!isDev) {
process.exit(1)
}
process.exit(1)
}

if (unsupportedConfig.length) {
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