rollup.ne-ts.config.js

import compile from "nearley/lib/compile";
import generate from "nearley/lib/generate";
import nearley from "nearley/lib/nearley";
import rawGrammar from "nearley/lib/nearley-language-bootstrapped";
import path from "path";
import rollup from "rollup";
import typescript from "rollup-plugin-typescript2";

const nearleyGrammar = nearley.Grammar.fromCompiled(rawGrammar);
function nearleyPlugin() {
  /** @type rollup.Plugin */
  const plug = {
    name: "nearley",
    transform(source, id) {
      if (!id.endsWith(".ne")) return null;
      const parser = new nearley.Parser(nearleyGrammar);
      parser.feed(source);
      const stderr = Object.getOwnPropertyDescriptor(process, "stderr");
      Object.defineProperty(process, "stderr", { value: { write: () => {} } });
      const compilation = compile(parser.results[0], {
        file: id
      });
      Object.defineProperty(process, "stderr", stderr);
      const code = generate(compilation, path.basename(id));
      return { code };
    }
  };
  return plug;
}
/** @type rollup.InputOptions */
const config = {
  experimentalCodeSplitting: true,
  output: {
    dir: "dist",
    format: "cjs"
  },
  input: {
    lib: "./src/lib/index.ts",
    cli: "./src/cli/index.ts",
    plugin: "./src/lib/lib.ts"
  },
  plugins: [
    nearleyPlugin(),
    typescript({
      include: ["*.ts+(|x)", "**/*.ts+(|x)", "*.ne", "**/*.ne"]
      // verbosity: 3
    })
  ],
  external: id => /^[^\\/.]/.test(id)
};

export default config;