post-edit-console-warn.js

#!/usr/bin/env node
/**
 * PostToolUse Hook: Warn about console.log statements after edits
 *
 * Cross-platform (Windows, macOS, Linux)
 *
 * Runs after Edit tool use. If the edited JS/TS file contains console.log
 * statements, warns with line numbers to help remove debug statements
 * before committing.
 */

const { readFile } = require('../lib/utils');

const MAX_STDIN = 1024 * 1024; // 1MB limit
let data = '';
process.stdin.setEncoding('utf8');

process.stdin.on('data', chunk => {
  if (data.length < MAX_STDIN) {
    const remaining = MAX_STDIN - data.length;
    data += chunk.substring(0, remaining);
  }
});

process.stdin.on('end', () => {
  try {
    const input = JSON.parse(data);
    const filePath = input.tool_input?.file_path;

    if (filePath && /\.(ts|tsx|js|jsx)$/.test(filePath)) {
      const content = readFile(filePath);
      if (!content) { process.stdout.write(data); process.exit(0); }
      const lines = content.split('\n');
      const matches = [];

      lines.forEach((line, idx) => {
        if (/console\.log/.test(line)) {
          matches.push((idx + 1) + ': ' + line.trim());
        }
      });

      if (matches.length > 0) {
        console.error('[Hook] WARNING: console.log found in ' + filePath);
        matches.slice(0, 5).forEach(m => console.error(m));
        console.error('[Hook] Remove console.log before committing');
      }
    }
  } catch {
    // Invalid input — pass through
  }

  process.stdout.write(data);
  process.exit(0);
});