rollup.base.js

import { nodeResolve } from "@rollup/plugin-node-resolve";
import typescript from "@rollup/plugin-typescript";
import peerDepsExternal from "rollup-plugin-peer-deps-external";

// eslint-disable-next-line no-undef
const production = process.env.NODE_ENV === "production";

export function createRollupConfig(format, name = undefined) {
  const outputDir = `dist/${format}`;
  const typescriptOptions =
    format == "es"
      ? {
          declaration: true,
          declarationDir: outputDir,
        }
      : {};

  return {
    input: "src/index.ts",
    output: {
      dir: outputDir,
      format,
      name,
      sourcemap: true,
    },
    plugins: [
      format == "es" ? peerDepsExternal() : null,
      typescript({
        rootDir: "src/",
        sourceMap: !production,
        inlineSources: !production,
        ...typescriptOptions,
      }),
      nodeResolve(),
    ],
  };
}