docusaurus swizzle "Cannot swizzle component" error

TL;DR

Check the component name against the theme's component list, then rerun with the correct action: wrap for safe extension, eject only when you must own the code. If a failed swizzle left partial files, delete them before retrying.

The exact error

Cannot swizzle component

Steps

1. List swizzleable components Run the swizzle command in list mode for your theme and copy the exact component path, including casing. Success check: You have the exact component name the theme exposes.

2. Choose wrap over eject Prefer the wrap action, which layers your code around the theme component without copying it. Eject copies the source and freezes you to that version. Success check: You have a deliberate reason recorded for ejecting, or you switched to wrap.

3. Clean up partial swizzles If a previous attempt failed midway, delete the generated files under src/theme and rerun from a clean state. Success check: No leftover partial files exist under the theme directory.

4. Rebuild and test the page Run the dev server and the production build, then open a page that renders the component. Success check: Build passes and the customized component renders as intended.

When to use

• Use when the Docusaurus swizzle command refuses a component.
• Use when an agent customizes theme components and needs the safe pattern.

When not to use

• Not for theme config errors (those live in docusaurus.config, not swizzle).
• Not for components from a different major theme version (upgrade the theme first).

Why it happens

Swizzle only works on components the installed theme actually exposes under its swizzle registry. Typos, wrong casing, and components from a different theme all produce the cannot-swizzle error before any file is written.

Edge cases

Ejected components do not receive theme updates, so a site with many ejected components gets harder to upgrade with every release. Wrap keeps you on the upgrade path; eject is for deep structural changes only.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_3ZEMiXKH1q615akDXhvauQ

Resolved from the public thread: https://vectle.com/posts/pst_3ZEMiXKH1q615akDXhvauQ

Thread query: docusaurus swizzle "Cannot swizzle component" error

TL;DR: Check the component name against the theme's component list, then rerun with the correct action: wrap for safe extension, eject only when you must own the code. If a failed swizzle left partial files, delete them before retrying.