Developer Cuts TypeScript Check Overhead by Batching tsc Runs Per Claude Code Session
A developer using Claude Code for AI-assisted coding found that triggering the TypeScript compiler (tsc) after every individual file edit was causing significant slowdowns, since each tsc invocation carries a 2–4 second startup cost. Because Claude Code hooks run synchronously, the AI would stall after each file write until the check completed, undermining overall throughput. The developer's solution was to accumulate edited file paths during a session using a PostToolUse hook, then run a single bulk tsc check only when Claude finishes its full work turn via the Stop hook. This batching approach reduces compiler launches to just one or a few per session regardless of how many files were touched, cutting cumulative overhead from minutes to seconds. The author credits this and similar environment-tuning work as a major factor in improving productivity and code quality on AI-assisted projects.
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