add jscpd

Author: ndbroadbent

.jscpd.json

@@ -0,0 +1,43 @@
+{
+  "threshold": 0,
+  "reporters": ["console"],
+  "ignore": [
+    "**/node_modules/**",
+    "**/dist/**",
+    "**/test-results/**",
+    "**/playwright-report/**",
+    "**/coverage/**",
+    "**/coverage_rails/**",
+    "**/generated/**",
+    "**/.jscpd/**",
+    "**/.git/**",
+    "**/tmp/**",
+    "**/log/**",
+    "**/rails_test_app/logstruct_test_app/**",
+    "**/docs/.next/**",
+    "**/docs/out/**",
+    "**/docs/.vercel/**",
+    "**/docspring/**",
+    "**/terraform-provider-logstruct/**",
+    "**/terraform-aws-logstruct/**",
+    "**/terraform-example/**",
+    "**/convox_racks_terraform/**",
+    "**/sorbet/rbi/**",
+    "**/vendor/**",
+    "**/AGENTS.md",
+    "**/CLAUDE.md",
+    "**/*.test.ts",
+    "**/*.test.tsx",
+    "**/*.spec.ts",
+    "**/*.spec.tsx",
+    "**/*.test.js",
+    "**/*.spec.js"
+  ],
+  "format": ["javascript", "typescript", "ruby"],
+  "minLines": 10,
+  "minTokens": 50,
+  "output": ".jscpd",
+  "exitCode": 1,
+  "absolute": false,
+  "gitignore": true
+}

Taskfile.yml

@@ -41,6 +41,12 @@ tasks:
     cmds:
       - scripts/spellcheck.sh
 
+  jscpd:
+    desc: Detect copy/paste duplication
+    deps: [prettier:deps]
+    cmds:
+      - pnpm exec jscpd . --exitCode 1
+
   test:
     desc: Run Ruby unit tests, Rails integration tests, and merge coverage
     cmds:

package.json

@@ -24,6 +24,7 @@
   "devDependencies": {
     "@docspring/cspell-lockfile-dicts": "^1.2.0",
     "cspell": "^9.2.1",
+    "jscpd": "^4.0.7",
     "prettier": "^3.4.2"
   }
 }