JavaScript
JavaScript accessed a let or const binding before initialization
ReferenceError: can't access lexical declaration 'X' before initialization
JavaScript tried to read a let, const, or class binding while it was still in the temporal dead zone.
Observed message
ReferenceError: can't access lexical declaration 'X' before initialization
Why it happens
- A let, const, or class binding is read before its declaration runs.
- Circular imports expose bindings before initialization completes.
- Execution order assumptions are wrong in modules or blocks.
How to fix it
- Move the access so it happens after initialization.
- Check for circular imports between modules.
- Review execution order inside blocks, modules, and class setup code.
