Automatic formatting after write

After every file write or edit, runs Prettier on the modified file to ensure consistent formatting without agent intervention.

{
  "hooks": {
    "PostToolUse": [
      {
        "hooks": [
          {
            "command": "node $CLAUDE_PROJECT_DIR/.claude/hooks/autoformat.mjs",
            "type": "command"
          }
        ],
        "matcher": "Write|Edit"
      }
    ]
  }
}

#!/usr/bin/env node
// Formate le fichier avec prettier après écriture (PostToolUse Write|Edit)
import { readFileSync } from 'fs';
import { execSync } from 'child_process';
import { fileURLToPath } from 'url';

function defaultExec(cmd) {
  execSync(cmd, { stdio: 'ignore', timeout: 10_000 });
}

export function run(input, { exec = defaultExec } = {}) {
  const filePath = input.tool_input?.file_path ?? '';
  if (!filePath) return null;

  try {
    exec(`npx --no-install prettier --write "${filePath}"`);
    return { formatted: filePath };
  } catch {
    // prettier absent ou erreur de format — non bloquant
    return null;
  }
}

/* v8 ignore next 4 */
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const input = JSON.parse(readFileSync(0, 'utf8'));
  run(input);
}