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Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/46282 We intended to enable Fusebox on `main` since https://github.com/facebook/react-native/pull/45469 — this worked when building under Buck, however was not working for builds under Xcode/Android Studio. This is because the `HERMES_ENABLE_DEBUGGER` preprocessor flag is not equivalently defined in these build configurations. This diff genericises these checks to `!defined(NDEBUG)` (i.e. *any debug build*), meaning we are correctly able to evaluate the `ReactNativeFeatureFlags::fuseboxEnabledDebug()` setting. Changelog: [Internal] NOTE: `NDEBUG` should be the as-generic-as-possible choice to select a debug build in both OSS and fbsource. Having `HERMES_ENABLE_DEBUGGER` set remains significant (AFAIK) **within the Hermes codebase** (there are no other references in `jsinspector-modern`). Evaluation of whether the lack of this flag works in OSS continues in T200241280. Reviewed By: hoxyq Differential Revision: D61966685 fbshipit-source-id: d30950172420a0afd6c137dbf014794f3353bb7a