rollup.config.js

import pkg from "./package.json";
import git from "git-rev-sync";
import typescript from "rollup-plugin-typescript2";
import { terser } from "rollup-plugin-terser";
import dts from "rollup-plugin-dts";

let input, output;

const IIFE_FILENAME = "dist/owl.iife.js";
const CJS_FILENAME = "dist/owl.cjs.js";
const ES_FILENAME = "dist/owl.es.js";

if (pkg.module !== ES_FILENAME || pkg.main !== CJS_FILENAME) {
  throw new Error("package.json has been modified. Build script should be updated accordingly");
}

const outro = `
__info__.date = '${new Date().toISOString()}';
__info__.hash = '${git.short()}';
__info__.url = 'https://github.com/odoo/owl';
`;

switch (process.argv[4]) {
  case "compiler":
    (input = "src/compiler/index.ts"),
      (output = [getConfigForFormat("cjs", "dist/compiler.js", "")]);
    break;
  case "runtime":
    input = "src/runtime/index.ts";
    output = [
      getConfigForFormat("esm", addSuffix(ES_FILENAME, "runtime"), outro),
      getConfigForFormat("cjs", addSuffix(CJS_FILENAME, "runtime"), outro),
      getConfigForFormat("iife", addSuffix(IIFE_FILENAME, "runtime"), outro),
      getConfigForFormat("iife", addSuffix(IIFE_FILENAME, "runtime"), outro, true),
    ];
    break;
  default:
    (input = "src/index.ts"),
      (output = [
        getConfigForFormat("esm", ES_FILENAME, outro),
        getConfigForFormat("cjs", CJS_FILENAME, outro),
        getConfigForFormat("iife", IIFE_FILENAME, outro),
        getConfigForFormat("iife", IIFE_FILENAME, outro, true),
      ]);
}

/**
 * Generate from a string depicting a path a new path for the minified version.
 * @param {string} pkgFileName file name
 */
function addSuffix(pkgFileName, suffix) {
  const parts = pkgFileName.split(".");
  parts.splice(parts.length - 1, 0, suffix);
  return parts.join(".");
}

/**
 * Get the rollup config based on the arguments
 * @param {string} format format of the bundle
 * @param {string} generatedFileName generated file name
 * @param {boolean} minified should it be minified
 */
function getConfigForFormat(format, generatedFileName, outro, minified = false) {
  return {
    file: minified ? addSuffix(generatedFileName, "min") : generatedFileName,
    format: format,
    name: "owl",
    extend: true,
    outro: outro,
    freeze: false,
    plugins: minified ? [terser()] : [],
    indent: "    ", // indent with 4 spaces
  };
}

export default [
  {
    input,
    output,
    plugins: [
      typescript({
        useTsconfigDeclarationDir: true,
      }),
    ],
  },
  {
    input: "src/compiler/standalone/index.ts",
    output: [{ file: "dist/compile_templates.mjs", format: "es" }],
    external: ["fs", "fs/promises", "path", "jsdom"],
    plugins: [
      typescript({
        useTsconfigDeclarationDir: true,
      }),
    ],
  },
  {
    input: "dist/types/index.d.ts",
    output: [{ file: "dist/types/owl.d.ts", format: "es" }],
    plugins: [dts()],
  },
];