Duplicate code detection

Finds copied blocks so a fix in one copy is not missed in the others, and flags new code that re-implements an existing helper.

V1011 technique

not detectable from CI configuration

Sub-techniques

ID	Name	Description
`V1011.001`	Token clone detection	Report token-identical or near-identical blocks above a size threshold.
`V1011.002`	Semantic reuse check	Search the codebase for an existing function that does what the new code does, by embedding or by name.

Run a clone detector with a minimum token count that ignores tests and generated code.
Report only clones introduced by the change.
For reuse, index function signatures and docstrings and query with each new function.

Signs that a codebase already runs this technique, and where to read how it is configured.

.jscpd.json or a cpd task in the build.
Review comments asking to reuse an existing helper point at where this is missing.