Exclude changed files if deleted or from submodules

Author: hkdobrev

src/gitChangedFilesSinceLastHead.js

@@ -1,5 +1,6 @@
 import { execaSync } from 'execa';
 
-export default () => execaSync({ lines: true })`git diff-tree --name-only --no-commit-id -r HEAD@{1} HEAD`
+// Get the list of changed files since the previous HEAD from a git hook
+export default () => execaSync({ lines: true })`git diff-tree --name-only --no-commit-id --diff-filter=d --ignore-submodules -r HEAD@{1} HEAD`
   .stdout
   .filter((file) => !!file);