rollup-plugin-flat-dts

A Rollup plugin that flattens TypeScript .d.ts declaration files into a single bundle, generating a merged type definition file. Current stable version 2.9.0 supports Rollup 2.79.1–5.0 and TypeScript 4.8.4–5.8. It differs from other .d.ts bundlers by flattening instead of merging, which imposes strict constraints: all exports are public (use @internal to mark internals), default exports only at top level, and no renamed re-exports. Ideal for libraries that want a single type file and can adhere to its limitations. Released roughly twice a year, tracking TypeScript minor versions.