Under the Hood: The JavaScript SDK – error handling

This post details the error handling mechanisms within Meta's JavaScript SDK. It introduces a `guard` function to wrap arbitrary functions, ensuring that errors thrown during execution are caught, logged, and optionally re-thrown. The post also describes a `ManagedError` type to differentiate between intentional and unintentional errors, and outlines strategies for handling errors in callbacks and returned functions. Finally, it discusses a pattern for differentiating between internal and external callers to avoid redundant error logging and mitigate the impact of monkey patching.