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Articles about Debugging.
This error normally identifies a very old Node.js/V8 parser, not a defective `let` or `const` statement. Diagnose the executable actually running, move the project to a supported Node.js release, reinstall dependencies predictably, and keep modern CommonJS/ESM errors separate.
An empty array is valid input to count() and returns zero. This warning means the runtime value is null, scalar, or otherwise non-countable; find where the type contract broke, then fix or normalize it intentionally.
A debugger becomes useful when a crash that looked random becomes one source line, one call path, and one impossible value. Follow a complete GDB investigation from failure to verified fix.