TSCC is a toolchain that lets developers write ordinary TypeScript and then automatically transpile it with tsickle and bundle‑minify it with Google Closure Compiler. It provides a simple CLI, a JavaScript API and a Rollup plugin, handling module spec files, externs and external‑module mapping so that any TypeScript project (including those using Rollup) can be migrated to Closure‑powered builds for maximal size and performance. It’s aimed at front‑end engineers who want the aggressive optimizations of Closure Compiler without the usual integration hassle.