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* Add tracing support to tsserver Read the `TSS_TRACE` environment variable to determine which directory trace files should be written to. Notable changes from tsc tracing: 1) Drop all tracepoints that depend on type IDs 2) Write output to trace.PID.json 3) New, server-specific events (request/response, cancellation, etc) * Drop try-finally blocks that aren't strictly necessary * Fix lint error * Trace background work (for diagnostics) * Move try-finally blocks into session so tsc doesn't use them * Add missing try-finally * Use consistent capitalization * Inline canPop call where underlying variable is available * Clarify comments * Include PID in build-mode file names * Introduce more efficient popAll function * Trace throwIfCancellationRequested rather than isCancellationRequested * Remove unnecessary try-finally blocks * Add a command-line argument for consistency with logging * Fix rebase issues * Address PR feedback * Rename completionEvents to eventStack * Drop assertStackEmpty as hard-to-maintain and marginally valuable * Rename stepCancellation to stepCanceledEarly * Rename stepEarlyCancellation to stepCanceled and use flag instead * Check correct variable on exit