@agilgur5/tsconfig/src/tsconfig.library-build.json

My tsconfig base files, extending @tsconfig/strictest

{
  // tsconfig.library.json is used for type-checking _all_ files, tsconfig.library-build.json is just used for the build
  "extends": "./tsconfig.library.json",
  // allowlist of files to build
  "files": ["src/index.ts"],
  "compilerOptions": {
    // override the base
    "noEmit": false,
    // don't output JS files, only declarations (Rollup outputs the JS)
    "emitDeclarationOnly": true,
  },
  // read this file as a tsconfig even though it's named slightly differently
  "$schema": "https://json.schemastore.org/tsconfig",
}