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Vite surfaced a strict-mode type error from incompatible code

TypeError: Cannot create property 'foo' on boolean 'false'

Vite surfaced runtime code that depends on non-strict JavaScript semantics, which fail under ESM strict mode.

TypeError: Cannot create property 'foo' on boolean 'false'runtime

Observed message

TypeError: Cannot create property 'foo' on boolean 'false'

Why it happens

  • Legacy code relies on loose JavaScript behavior that strict mode forbids.
  • A dependency mutates values in ways that only worked outside strict mode.
  • Code that was never designed for ESM is now running through Vite.

How to fix it

  1. Inspect the stack trace to find the dependency or file using sloppy-mode assumptions.
  2. Patch, replace, or isolate the incompatible code path.
  3. Modernize the code so it behaves correctly in ESM strict mode.

Official reference

Vite: Troubleshooting

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Vite TypeError Cannot create property on boolean false: causes and fixes | Error Atlas