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Identify unused code, imports, variables, and functions for safe removal.
npx skill4agent add curiouslearner/devkit dead-code-detector// Unused
import { foo, bar } from 'module'; // bar is never used
// Recommended
import { foo } from 'module';// Unused
const result = calculate();
const unused = 42; // Never referenced
// Dead assignment
let value = 10;
value = 20; // First assignment is deadfunction example() {
return true;
console.log('Never executes'); // Dead code
}
if (false) {
// Dead code block
}// Private function never called
function helperFunction() {
// ...
}
// Exported but not used anywhere
export function unusedExport() {
// ...
}@dead-code-detector
@dead-code-detector src/
@dead-code-detector --include-tests
@dead-code-detector --aggressive
@dead-code-detector --safe-only# Dead Code Detection Report
## Summary
- Total unused items: 47
- Safe to remove: 32
- Needs review: 15
- Potential savings: ~1,200 lines
## Safe to Remove (32)
### Unused Imports (12)
- src/utils/helpers.js:3
`import { oldFunction } from './legacy'`
- src/components/Button.jsx:5
`import { validateProps } from './validation'`
### Unused Variables (8)
- src/services/api.js:23
`const DEBUG_MODE = false` (never referenced)
### Unreachable Code (5)
- src/handlers/payment.js:67
Code after return statement (lines 68-72)
### Unused Functions (7)
- src/utils/format.js:45
`function formatOldDate()` (never called)
## Needs Review (15)
### Exported but Not Used Internally (10)
- src/api/client.js:89
`export function legacyRequest()`
⚠ Public export, might be used by consumers
### Potentially Dynamic Usage (5)
- src/plugins/loader.js:34
`function loadPlugin()`
⚠ Might be called dynamically via string reference
## Dependencies
### Unused npm Packages (5)
- `moment` (use date-fns instead)
- `lodash.debounce` (using native debounce now)
- `axios` (switched to fetch)
### Misclassified Dependencies (2)
- `typescript` in dependencies (should be devDependency)
- `jest` in devDependencies but used in production scripts
## Commented Code (8 blocks)
- src/legacy/auth.js:120-145 (25 lines commented)
- src/components/Modal.jsx:67-82 (15 lines commented)
## Recommendations
1. **Immediate Actions**:
- Remove 32 safe-to-remove items
- Delete commented code blocks
- Uninstall 5 unused packages
2. **Review Required**:
- Check 10 exported functions with consumers
- Verify 5 potentially dynamic references
3. **Estimated Impact**:
- Bundle size reduction: ~45KB
- Code reduction: ~1,200 lines
- Dependency reduction: 5 packages// Might look unused but called dynamically
const handlers = {
onClick: handleClick,
onHover: handleHover
};
// Called via string
window['initApp']();// Used only in tests, might appear unused in main code
export function testHelper() {}// Exported for external consumers
export function publicApi() {
// Not used internally but part of public interface
}