Problem

Users requesting a way to specify a custom tsconfig for indexTransform and customWebpackConfig files.

Solution

Added documentation explaining that this already works via the ts-node configuration section in tsconfig.json, which is a standard TypeScript/ts-node feature.

Changes

• Updated packages/custom-webpack/README.md:
  • Added new subsection 'Using a Custom TypeScript Configuration for indexTransform' under the Index Transform section
  • Provided examples of two approaches:
    1. Inline ts-node compilerOptions overrides
    2. Using a separate tsconfig file via ts-node.tsconfig
  • Updated Table of Contents
  • Linked to official ts-node documentation

Note

This is purely a documentation enhancement. The feature was already working as Jeb noted in the issue comments — users just didn't know how to use it.

Fixes #1162