Use when re-running `shadcn add <component>` would overwrite a file in `components/ui/` that you have edited locally, when a teammate reports that "the CLI wiped my changes", when deciding whether to update a shadcn component to pick up upstream fixes (Calendar v9, cmdk break, security patch) without losing custom variants, or when you need a deterministic strategy to keep custom code alive across `--overwrite` runs. Prevents the silent-destruction trap where `pnpm dlx shadcn@latest add button --overwrite` blasts local edits with zero confirmation, the miss-the-upstream-fix trap where teams freeze a component and stop receiving critical patches, and the inline-custom-variants trap where edits embedded directly in `components/ui/<name>.tsx` are unrecoverable after a re-add. Covers the diff-first workflow with `add --diff`, the three resolution strategies (vendor / diff-merge / fork), the custom-variants-in-a-separate-file pattern that survives any re-add, pre-update git hygiene, the `migrate icons` and `migrat
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name
shadcn-errors-cli-sync-mismatch
description
Use when re-running `shadcn add <component>` would overwrite a file in `components/ui/` that you have edited locally, when a teammate reports that "the CLI wiped my changes", when deciding whether to update a shadcn component to pick up upstream fixes (Calendar v9, cmdk break, security patch) without losing custom variants, or when you need a deterministic strategy to keep custom code alive across `--overwrite` runs. Prevents the silent-destruction trap where `pnpm dlx shadcn@latest add button --overwrite` blasts local edits with zero confirmation, the miss-the-upstream-fix trap where teams freeze a component and stop receiving critical patches, and the inline-custom-variants trap where edits embedded directly in `components/ui/<name>.tsx` are unrecoverable after a re-add. Covers the diff-first workflow with `add --diff`, the three resolution strategies (vendor / diff-merge / fork), the custom-variants-in-a-separate-file pattern that survives any re-add, pre-update git hygiene, the `migrate icons` and `migrate radix` flows, and why `components.json` does NOT pin per-component versions. Keywords: shadcn cli overwrite, CLI wiped my changes, shadcn diff, shadcn add --diff, shadcn add --overwrite, shadcn add --dry-run, custom variants lost, vendor pattern, fork shadcn component, diff merge, how do I preserve customizations, shadcn add --overwrite danger, never update shadcn, components.json version pin, evergreen components, shadcn migrate icons, shadcn migrate radix, lucide to radix icons, @radix-ui to radix-ui, button-extensions, separate variants file, my customizations are gone, lost local edits, re-add component, update shadcn component, shadcn update workflow, pin shadcn component version, snapshot shadcn, fork shadcn ui, copy shadcn to lib, security fix shadcn, react-day-picker v9 upgrade, cmdk break recovery, git status before shadcn add, clean working tree shadcn, shadcn cli destructive, preserve customizations shadcn, shadcn no version lock.
license
MIT
compatibility
Designed for Claude Code. Requires shadcn ui evergreen-2026 (CLI shadcn@4.7.0).
metadata
{"author":"OpenAEC-Foundation","version":"1.0"}
shadcn CLI Sync Mismatch : Recovering and Preventing Overwrite of Local Edits
shadcn copies component source into your repo. Once copied, the file
in components/ui/<name>.tsx is YOUR code. The CLI does NOT remember
that you edited it. Re-running shadcn add <name> --overwrite (or
running add <name> with -y and accepting the prompt) replaces the
file byte-for-byte with the current registry version. Local edits are
gone. There is no undo inside the CLI ; recovery is git-only.
This skill defines the diff-first workflow that prevents that loss,
three resolution strategies for picking up upstream changes, and the
custom-variants-in-a-separate-file pattern that makes re-adds safe.
Companion skills :
shadcn-core-cli : full reference for every CLI command and flag
shadcn-errors-styling-conflicts : when re-adds expose Tailwind
class-order conflicts in your customizations
Quick Reference : The Problem in One Paragraph
components.json does NOT record which version of each component you
have. The CLI is evergreen : every add fetches the CURRENT registry
item. There is no per-component lockfile, no components.lock.json,
no installedVersion field. The single source of truth for "what
version do I have" is the file content on disk. If you edited that
file and lost the prior commit, the only recovery is to re-add (which
discards your edits) or restore from git history. ALWAYS treat every
file in components/ui/ as code you own and version-control like any
other source.
Quick Reference : The Diff-First Workflow (ALWAYS)
NEVER run add <name> --overwrite blind. ALWAYS preview with --diff
first. The canonical sequence is :
git status MUST be clean (or all components/ui/ changes staged
and committed). NO uncommitted edits to the target file.
pnpm dlx shadcn@latest add <name> --diff to preview the upstream
diff against your current file.
Decide on a resolution strategy (see next section).
If applying : pnpm dlx shadcn@latest add <name> --overwrite.
git diff HEAD to review what the CLI changed.
Re-apply any necessary customizations (or rely on
custom-variants-in-separate-file).
Commit with a message that names the registry version source
(e.g. "chore: re-add Calendar from shadcn@latest for v9 fix").
If git status is dirty when you start, STOP. Commit or stash first.
A failed merge plus a dirty tree means you cannot tell which lines are
"your edit" and which are "shadcn just wrote that".
--dry-run is a safer-than---diff first probe : it prints the
planned operations without writing anything AND without producing a
patch. Use --dry-run to confirm what files will be touched, then
--diff to see the actual content delta.
Quick Reference : The --diff Flag, NOT a diff Subcommand
There is no shadcn diff subcommand. The diff capability ships as a
FLAG on the add command. Verified at
https://ui.shadcn.com/docs/cli (2026-05-19) :
pnpm dlx shadcn@latest add button --diff is correct.
pnpm dlx shadcn@latest diff button is WRONG. It throws "unknown
command".
There is also no shadcn update subcommand. The update workflow IS
the diff + overwrite pair above.
Quick Reference : The Three Resolution Strategies
When --diff shows that upstream has changed, you choose ONE strategy
per component. The choice is per-component, not per-project.
Strategy
When to use
Cost
Risk
Vendor (snapshot)
Component is stable, your edits are heavy, no upstream fixes needed
Zero
Miss security and bugfixes forever
Diff-merge
Some local edits + upstream has fixes worth pulling
Manual merge per update
Merge mistakes if edits and upstream lines collide
Fork (copy out)
Heavy customization AND you still want to track upstream
Two paths to maintain
Drift from registry conventions
Most projects use a mix : Button and Card are vendored (rarely
change), Calendar and Command are diff-merged (cmdk / react-day-picker
break often), a heavily-extended Sidebar is forked to
lib/components/sidebar/.
Strategy 1 : Vendor (treat add as a one-time snapshot)
ALWAYS run shadcn add <name> exactly once per component. Edit the
file freely afterwards. NEVER re-run add <name> for that component.
The registry version is irrelevant ; the on-disk version is canonical.
Trade-off : you stop receiving upstream bugfixes and security
patches. For low-risk components (Card, Badge, Skeleton, Separator,
Alert) this is fine. For components with active maintenance (Calendar,
Command/Combobox, Sidebar, Sheet) the risk is real.
Mark vendored components with a top-of-file comment so the next
maintainer knows :
// VENDORED 2026-05-15 from shadcn@latest. Do NOT re-run `shadcn add card`.// Local edits below.
Strategy 2 : Diff-merge (recommended default)
You keep up with upstream AND retain customizations. Workflow :
Commit all local work to clean the tree.
pnpm dlx shadcn@latest add <name> --diff to see upstream changes.
If the diff is small (1-3 lines, no overlap with your edits) :
apply with --overwrite, then re-apply your custom variant or
prop in a follow-up commit.
If the diff overlaps your edits : do NOT use --overwrite. Instead,
manually copy the upstream lines from the diff output and apply
them in your editor with three-way reasoning (upstream / yours /
merged).
Commit with subject "chore: sync with shadcn@latest" and
body listing both upstream changes pulled and local changes
preserved.
Diff-merge fails fastest when you have inline custom variants. See
the "Custom Variants in a Separate File" pattern below for the fix.
Strategy 3 : Fork (copy upstream to a different path)
You treat the registry file as an upstream reference and maintain a
forked copy at a different path that imports the same primitives.
Keep the original components/ui/sidebar.tsx ONLY as a reference for
diffs against upstream ; OR delete it if your fork is permanent. To
pull upstream changes : add sidebar --overwrite updates the
reference copy ; then diff lib/components/sidebar/sidebar.tsx components/ui/sidebar.tsx shows what to consider porting.
Trade-off : you lose the convention that @/components/ui/<name>
points to the canonical component. Document the fork in a top-level
README or a lib/components/README.md.
Quick Reference : The Custom-Variants-in-a-Separate-File Pattern
This pattern makes --overwrite safe. The rule : NEVER add a new
variant value or size value to components/ui/<name>.tsx. ALWAYS
put extensions in a sibling file.
Now shadcn add button --overwrite is safe : button-extensions.tsx
is untouched, the new warning and success intents survive.
The same pattern applies to forms (form-extensions.tsx), data tables
(data-table-extensions.tsx), and any other component you commonly
augment. See references/examples.md for full working code.
Quick Reference : Pre-Update Hygiene Checklist
Before ANY add <name> --overwrite or add <name> without -y :
git status clean OR all components/ui/ edits committed.
On a feature branch, not main. The merge should be a PR.
pnpm dlx shadcn@latest add <name> --dry-run ran without error.
For deeper attribution, compare each file to the current registry
version (cheap heuristic : if git log <file> shows a single commit
with a "chore: add " message, it was likely never edited).
A custom file outside components/ui/ (e.g. lib/components/...) is
unambiguously yours. A file inside components/ui/ with multiple
commits and non-shadcn-shaped diffs has been customized.
Quick Reference : Migration Aids
shadcn ships migration commands that perform sweeping rewrites
across all components/ui/ files. Two are relevant here because they
explicitly touch every component file and therefore interact with the
same overwrite hazard :
pnpm dlx shadcn@latest migrate icons : swaps the project icon
library (e.g. lucide-react -> @radix-ui/react-icons). Updates
every component's icon imports. Run with clean tree. Set the new
default in components.json#iconLibrary after.
pnpm dlx shadcn@latest migrate radix : moves from per-primitive
@radix-ui/react-* packages to the unified radix-ui package
(Feb 2026 change). Rewrites all imports.
Pass -y to skip the per-file confirmation prompt only after a
--dry-run review. Both migrate icons and migrate radix are
SAFE for vendored components in the sense that they only touch
imports, not body logic, BUT they still rewrite the file, so commit
first.
See references/methods.md for command signatures and
references/examples.md for full workflows.
Decision Tree : Should I Re-Run shadcn add <name>?
Is there an upstream change you NEED (bugfix, security, breaking-deps fix)?
├── No -> Do nothing. The current file is fine.
└── Yes -> Continue.
Is the local file edited beyond what `add` originally wrote?
├── No -> `add <name> --overwrite`. Done.
└── Yes -> Are custom variants in a `*-extensions.tsx` sibling file?
├── Yes -> `add <name> --overwrite` is safe. The
│ extensions file is untouched.
└── No -> STOP. Refactor inline variants into
`*-extensions.tsx` FIRST. Then overwrite.
OR use diff-merge (manual three-way merge).
OR fork to `lib/components/` if customization
is heavy enough.
Patterns : What to Document Per Component
For every component in components/ui/, the project SHOULD record one
of these states. A single comment line at the top of the file or in
components/ui/README.md is enough :
VENDORED YYYY-MM-DD : never re-add. Living snapshot.
TRACKED : will run add --diff before any update.
FORKED-TO <path> : original kept as upstream reference, real code
lives elsewhere.
MIGRATED-AWAY : replaced with a non-shadcn alternative.
Without this state, the next developer cannot tell whether overwriting
is safe.
Reference Links
Companion : shadcn-core-cli (full CLI reference including all add flags)
