Patch Creation & Registration

Overview

Patches are code modifications applied to Claude Code's cli.js (or native binary). Each patch finds specific patterns in the minified code and replaces/injects new behavior.

Creating a New Patch

1. Create the patch file

Create src/patches/myPatch.ts:

// Please see the note about writing patches in ./index

import { showDiff } from './index';

/**
 * Description of what this patch does.
 *
 * CC X.Y.Z:
 * ```diff
 *  // Show before/after of the code change
 * -oldCode
 * +newCode
 * ```
 */
export const writeMyPatch = (
  file: string,
  configValue: string // Add parameters as needed
): string | null => {
  // Pattern to find in minified code
  // IMPORTANT: Use [$\w]+ for identifiers (not \w+) because $ is valid in JS identifiers
  // IMPORTANT: Start patterns with a boundary char (,;}{) for HIGH performance (e.g. 1.5s -> 30ms)
  const pattern = /,somePattern([$\w]+)/;

  const match = file.match(pattern);

  if (!match || match.index === undefined) {
    console.error('patch: myPatch: failed to find pattern');
    return null;
  }

  const replacement = `,newCode${match[1]}`;

  const startIndex = match.index;
  const endIndex = startIndex + match[0].length;

  const newFile =
    file.slice(0, startIndex) + replacement + file.slice(endIndex);

  showDiff(file, newFile, replacement, startIndex, endIndex);

  return newFile;
};

2. Add config type (if patch is configurable)

Edit src/types.ts - add to MiscConfig or create a new interface:

export interface MiscConfig {
  // ... existing fields ...
  myNewSetting: string | null; // null = disabled
}

3. Add default value

Edit src/defaultSettings.ts:

misc: {
  // ... existing fields ...
  myNewSetting: null,  // or a sensible default
},

4. Register in index.ts

Edit src/patches/index.ts:

4a. Add import:

import { writeMyPatch } from './myPatch';