Build failure: `esmExternals` config breaks production build
#1 507 ouverte le 22 mai 2026
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Description
This issue was created by an agent analysing CI failures from the Next.js Deploy Suite (vinext
mainvs Next.jsv16.2.6, 2026-05-22).
Problem
Test apps that enable esmExternals (or experimental.esmExternals) in next.config.js fail the production build with Custom deploy script failed: undefined (1). This blocks the entire esm-externals suite (10 tests).
Build fails when esmExternals is configured
Estimated Impact
~10 test failures across the deploy suite.
Affected Test Suites
test/e2e/esm-externals/esm-externals.test.ts(10 failures)
Recommendation
-
Reproduce first in vinext's own test suite. Set
experimental.esmExternals: trueinnext.config.jsof a small fixture and confirm the build fails. -
Handle the option or no-op it cleanly. Either implement the documented semantics (treat externals as ESM) or no-op the option to unblock the suite.
-
Investigate Rolldown ESM externals semantics. May involve adjusting how externals are externalised in each environment.
Part of #1328.