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on-edit-formatter

Apply code formatting rules after file edits in the source directory. Use when asked to format code or after making changes to source files.

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SKILL.md (original)

Review the instructions the agent will receive before you install.

Post-edit formatting

After making any file edit in src/ or lib/, apply formatting automatically. This skill runs as background context — Claude applies these rules after edits without the user needing to ask.

Step 1: Run prettier on the edited file

Run:

npx prettier --write <path-to-edited-file>

Replace <path-to-edited-file> with the actual path of the file that was just edited.

If prettier modifies the file, note what changed (e.g., "Reformatted 3 lines in src/auth/login.ts").

If prettier is not installed or not configured (no .prettierrc, prettier.config.js, or prettier key in package.json), skip this step and note: "prettier not configured in this project."

Step 2: Run eslint --fix on the edited file

Run:

npx eslint --fix <path-to-edited-file>

Replace <path-to-edited-file> with the same path.

If eslint --fix makes changes, note what was fixed.

If eslint reports errors that --fix cannot resolve automatically, list them clearly so the user is aware. Do not hide linting errors.

If eslint is not installed or not configured (no .eslintrc*, eslint.config.*, or eslintConfig key in package.json), skip this step and note: "eslint not configured in this project."

Step 3: Report

Summarize what was done:

  • Which file was formatted
  • What prettier changed (or that it made no changes)
  • What eslint fixed (or that it made no changes)
  • Any remaining eslint errors requiring manual attention

If neither tool is installed, report that and do not treat it as an error. The task proceeds normally.

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