A gulp plugin, and hopefully with enough work, love and consensus becomes @rollup/gulp

yarn add -D rollup-stream-gulp

Currently the recommended way is to use @rollup/stream. This works well, but has a few limitations.

• requires \vinyl-source-stream``
• Outputs utf-8 only and not the chunks containing rollup metadata
  • only allows outputing one file per stream instance
  • options.manualChunks not supported
• DX is non-optimal

Accepts all the RollupOption's excluding input, which is gathered from gulp.src().

// gulpfile.ts
import gulp from "gulp";
import rollup from "rollup-stream-gulp";
// import rollup from "@rollup/gulp";

// generates two files, both in different formats under the `dist` directory.
export const build = async () =>
  gulp
    .src("src/index.ts")
    .pipe(
      rollup({
        output: [
          { file: "index.js", format: "cjs" },
          { file: "index.mjs", format: "esm" },
        ],
      })
    )
    .pipe(gulp.dest("dist"));

There are a few caveats.

Internally we use options.input = file.path, which means we may not get errors about file conflicts. We'll be looking to address these later on.