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a mapped numeric literal Default key mapping: - `8 -> 'Backspace'` - `9 -> 'Tab'` - `13 -> 'Enter'` - `27 -> 'Escape'` - `32 -> ' '` - `37 -> 'ArrowLeft'` - `38 -> 'ArrowUp'` - `39 -> 'ArrowRight'` - `40 -> 'ArrowDown'` - `46 -> 'Delete'` ## Handler Heuristics By default, the codemod only rewrites `keyCode` usage when it appears in keyboard-oriented contexts: - DOM listeners passed to `addEventListener('keydown' | 'keyup' | 'keypress', ...)` - JSX handlers such as `onKeyDown`, `onKeyUp`, and `onKeyPress` - Functions whose matching event parameter is explicitly typed as `KeyboardEvent` or `React.KeyboardEvent` - Keyboard-named handlers such as `handleKeyDown` This keeps the transform conservative for user-defined `.keyCode` properties outside browser keyboard handling. ## Exclusions - Assignments and updates such as `e.keyCode = 13` or `e.keyCode++` - Unmapped numeric key codes - Comparisons against non-literal values that cannot be folded to a mapped numeric key code - Branches that already mix the same object's `keyCode` and `key` checks - TypeScript handlers whose event parameter is explicitly typed as a non-keyboard event, unless `unsafe=true` - `switch` statements with any non-default case label that cannot be mapped deterministically ## Parameters - `force=true`: bypass keyboard-context heuristics and rewrite any safe `keyCode` comparison or switch - `unsafe=true`: allow rewrites even when the matching TypeScript event parameter is explicitly typed as a non-keyboard event ## Before And After ```js if (e.keyCode === 13 || e['keyCode'] === 32) { activate(); } switch (event.keyCode) { case 13: submit(); break; case 27: close(); break; } ``` ```js if (e.key === 'Enter' || e.key === ' ') { activate(); } switch (event.key) { case 'Enter': submit(); break; case 'Escape': close(); break; } ``` ## Usage ```bash # Run from the registry codemod run prefer-keyboardevent-key-over-keycode-javascript # Run the local workflow codemod run -w workflow.yaml # Optional conservative overrides codemod run -w workflow.yaml --param force=true codemod run -w workflow.yaml --param unsafe=true ``` ## Development ```bash pnpm test pnpm run check-types pnpm dlx codemod@latest workflow validate -w workflow.yaml pnpm dlx codemod@latest run -w workflow.yaml --dry-run . ``` ## License MIT 19:[["$","script",null,{"type":"application/ld+json","dangerouslySetInnerHTML":{"__html":"$47"}}],["$","$L48",null,{"state":{"mutations":[],"queries":[{"state":{"data":{"json":{"id":"5352b535-776c-4bfa-94c0-e5e995012319","name":"prefer-keyboardevent-key-over-keycode-javascript","displayName":"prefer-keyboardevent-key-over-keycode-javascript","description":"Replace deprecated KeyboardEvent.keyCode checks with standards-based event.key string comparisons in JavaScript and TypeScript keyboard handlers.","scope":null,"visibility":"public","downloadCount":0,"executionCount":0,"createdAt":"2026-05-05 22:25:47.329405+00","updatedAt":"2026-05-05 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