[zancas]

This PR adds a CI check that fails a PR on duplicated code.

The check

• The code-duplication job runs jscpd 5.4.3 on TypeScript, TSX, Kotlin and Swift.
• A clone is 50 tokens or 5 lines, inside one file or across files.
• The job compares the PR with the tip of its base branch. One clone that the base branch lacks fails the job.
• A push to main, dev or stable is compared with its parent commit.
• The job runs under fail-all. A failure cancels the PR run.
• The scan covers app, screens, ui, __tests__, __mocks__, .storybook, scripts, visual, android/app/src and ios.
• The ignore list holds generated and vendored paths only.

dev holds 249 clones today (2.89% of 126,038 lines). The check accepts those 249 clones as the baseline. An edit that moves one of them makes it a new clone, and the job fails until the edit removes it.

Commands

• yarn dupes zingolabs/dev runs the check locally.
• yarn dupes:report lists each clone in the tree.

Tests

__tests__/codeDuplicationGate.unit.ts holds five tests. They pin the zero-clone limit, the two thresholds, the ignore list, the fail-all wiring and the baseline argument.

I ran the check locally on two trees. The clean tree exits 0. A tree with one copied file reports 1 new and exits 1.

tsc, eslint, prettier --check, depcheck and all 284 Jest suites pass locally.

After the merge

An administrator must add code-duplication / jscpd to the required status checks of dev. Until then the job fails the run but branch protection does not require it.

🤖 Generated with Claude Code