fix-dts-default-cjs-exports automatically repairs TypeScript declaration files (.d.ts) mistakenly declaring module.exports as export default. This often occurs when migrating CommonJS modules to ES modules. The package analyzes .d.ts files and rewrites incorrect export default = module.exports declarations to a proper export = module.exports syntax, ensuring compatibility with TypeScript's module resolution. This prevents TypeScript compiler errors and improves interop between CommonJS and ES modules.