ts5to6

A command-line tool to migrate TypeScript configuration files to be compatible with TypeScript 6.0.

Overview

TypeScript 6.0 introduces several deprecations and breaking changes. This tool automatically migrates tsconfig.json files to account for two configuration breaking changes:

baseUrl deprecation: Before TypeScript 4.1, baseUrl was required in order to use paths. Many users only used it to enable paths, but never removed it after it became unnecessary. This tool can safely remove baseUrl and update paths mappings if necessary.
rootDir default value change: TypeScript 6.0 changed how rootDir is inferred when unspecified. This tool can set explicit rootDir values to maintain TypeScript 5.x behavior.

Usage

# Choose which fix you need, or run each in series:
npx @andrewbranch/ts5to6 --fixBaseUrl .
npx @andrewbranch/ts5to6 --fixRootDir .

# Or to start with a config not named 'tsconfig.json':
npx @andrewbranch/ts5to6 --fixBaseUrl ./tsconfig.app.json
npx @andrewbranch/ts5to6 --fixRootDir ./tsconfig.app.json

From the starting tsconfig.json file, the tool will recursively run on references, and also try to discover and update any related config files that will see a change through extends.