Case-Sensitive Linux Filesystem Exposed a Bug That Windows Silently Ignored for Months

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A developer's first Vercel deployment failed because a CSS file was imported as 'Randomfacts.css' while the actual filename was 'randomfacts.css' with a lowercase 'r'. The error had gone undetected locally for months because Windows filesystems are case-insensitive and resolved both spellings to the same file without complaint. Vercel builds on Linux, which treats uppercase and lowercase filenames as entirely distinct, causing the build to fail with an unresolved import error. The fix required matching the import to the real filename and, due to a Git quirk on Windows, renaming files with a case-only change requires a two-step process using a temporary filename. The developer's key takeaway was to deploy early in a project's lifecycle, since deployment environments like Linux can expose an entire category of bugs that a Windows development machine will never surface.

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