rollup.config.mjs

import path from "node:path";
import { globSync } from "glob";
import { fileURLToPath } from "node:url";
import terser from "@rollup/plugin-terser";
import typescript from "@rollup/plugin-typescript";
import { nodeResolve } from "@rollup/plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";

/**
 * Helper to get all the .test.ts files for compiling tests
 *
 * @returns The list of test input files
 */
function getTestFiles() {
  return Object.fromEntries(
    globSync("src/**/*.test.ts").map((file) => [
      // This remove `src/` as well as the file extension from each
      // file, so e.g. src/nested/foo.js becomes nested/foo
      path.relative(
        "src",
        file.slice(0, file.length - path.extname(file).length)
      ),
      // This expands the relative paths to absolute paths, so e.g.
      // src/nested/foo becomes /project/src/nested/foo.js
      fileURLToPath(new URL(file, import.meta.url)),
    ])
  );
}

export default [
  // Main runtime bundle
  {
    input: "src/index.ts",
    output: [
      {
        file: "dist/index.cjs",
        format: "cjs",
      },
      {
        file: "dist/index.mjs",
        format: "es",
      },
    ],
    plugins: [
      commonjs(),
      // Resolve imported modules
      nodeResolve(),
      // Parse and compile typescript
      typescript(),
      // Minify output
      terser(),
    ],
  },

  // Compiled test javascript
  // {
  //     input: getTestFiles(),
  //     output: {
  //         dir: 'dist',
  //         format: 'es'
  //     },
  //     plugins: [typescript()],
  //     external: ['jest'],
  // },
];