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jscpd
Open-source duplicate code detector for 220+ languages that can fail CI when a change adds new clones.
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- Stop a coding agent writing duplicate helper functions: the four causes, a test for each and the fix
Agents read 83.6% of the relevant code on turn 1 and 35.4% by turn 5. Check the transcript for a search before the write, then gate the diff with jscpd.