How a Redundant Dynamic Import Causes Silent Deploy Failures After Merging

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A runtime error — 'TypeError: __exportAll is not a function' — can crash a deployed application at module load time, before any application code executes. The root cause is an ineffective dynamic import: lazily importing a module that is already statically imported elsewhere in the same bundle, forcing the bundler to generate a namespace helper that ends up misplaced across chunks. Because preview builds process a smaller module graph, the bug goes undetected until the full merged bundle is compiled at deploy time, making it appear only after a merge. The fix is straightforward — replacing the redundant dynamic import with a direct static import eliminates the broken chunk dependency entirely. The broader lesson is that a passing preview build does not guarantee a successful deploy when the final output depends on the complete module graph, and any CI guard should be verified by deliberately triggering it at least once.

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