Returns whether dev-mode diagnostics are currently enabled.
Library internals call this before running any dev-only check. Consumers
rarely need to call it directly — prefer enableDevMode() at startup and
let the library gate its own diagnostics internally.
Returns whether dev-mode diagnostics are currently enabled.
Library internals call this before running any dev-only check. Consumers rarely need to call it directly — prefer
enableDevMode()at startup and let the library gate its own diagnostics internally.