RFC: Rollup static build

.gitignore

@@ -14,3 +14,4 @@ test/tmp
 test/typescript/typings
 perf/
 .nyc_output/
+dist-static/

package.json

@@ -12,6 +12,7 @@
     "build": "shx rm -rf dist && git rev-parse HEAD > .commithash && rollup --config rollup.config.ts --configPlugin typescript && shx cp src/rollup/types.d.ts dist/rollup.d.ts && shx chmod a+x dist/bin/rollup",
     "build:cjs": "shx rm -rf dist && rollup --config rollup.config.ts --configPlugin typescript --configTest && shx cp src/rollup/types.d.ts dist/rollup.d.ts && shx chmod a+x dist/bin/rollup",
     "build:bootstrap": "node dist/bin/rollup --config rollup.config.ts --configPlugin typescript && shx cp src/rollup/types.d.ts dist/rollup.d.ts && shx chmod a+x dist/bin/rollup",
+    "build:static": "shx rm -rf dist-static && git rev-parse HEAD > .commithash && rollup --config rollup.config.static.ts --configPlugin typescript && shx chmod a+x dist-static/rollup",
     "ci:lint": "npm run lint:nofix",
     "ci:test": "npm run build:cjs && npm run build:bootstrap && npm run test:all",
     "ci:test:only": "npm run build:cjs && npm run build:bootstrap && npm run test:only",

rollup.config.static.ts

@@ -0,0 +1,124 @@
+import fs from 'fs';
+import path from 'path';
+import alias from '@rollup/plugin-alias';
+import commonjs from '@rollup/plugin-commonjs';
+import json from '@rollup/plugin-json';
+import resolve from '@rollup/plugin-node-resolve';
+import { RollupOptions, WarningHandlerWithDefault } from 'rollup';
+import { string } from 'rollup-plugin-string';
+import typescript from 'rollup-plugin-typescript';
+import conditionalFsEventsImport from './build-plugins/conditional-fsevents-import';
+import emitModulePackageFile from './build-plugins/emit-module-package-file';
+import esmDynamicImport from './build-plugins/esm-dynamic-import';
+import getLicenseHandler from './build-plugins/generate-license-file';
+import pkg from './package.json';
+
+const commitHash = (function () {
+	try {
+		return fs.readFileSync('.commithash', 'utf-8');
+	} catch (err) {
+		return 'unknown';
+	}
+})();
+
+const now = new Date(
+	process.env.SOURCE_DATE_EPOCH
+		? 1000 * parseInt(process.env.SOURCE_DATE_EPOCH)
+		: new Date().getTime()
+).toUTCString();
+
+const banner = `#! /usr/bin/env node
+/*
+  @license
+	Rollup.js v${pkg.version}
+	${now} - commit ${commitHash}
+
+	https://github.com/rollup/rollup
+
+	Released under the MIT License.
+*/`;
+
+const onwarn: WarningHandlerWithDefault = warning => {
+	// eslint-disable-next-line no-console
+	console.error(
+		'Building Rollup produced warnings that need to be resolved. ' +
+			'Please keep in mind that the browser build may never have external dependencies!'
+	);
+	throw new Error(warning.message);
+};
+
+const moduleAliases = {
+	entries: [
+		{ find: 'help.md', replacement: path.resolve('cli/help.md') },
+		{ find: 'package.json', replacement: path.resolve('package.json') },
+		{ find: 'acorn', replacement: path.resolve('node_modules/acorn/dist/acorn.mjs') }
+	],
+	resolve: ['.js', '.json', '.md']
+};
+
+const treeshake = {
+	moduleSideEffects: false,
+	propertyReadSideEffects: false,
+	tryCatchDeoptimization: false
+};
+
+const nodePlugins = [
+	alias(moduleAliases),
+	resolve(),
+	json(),
+	conditionalFsEventsImport(),
+	string({ include: '**/*.md' }),
+	commonjs({ include: 'node_modules/**' }),
+	typescript()
+];
+
+export default (command: Record<string, unknown>): RollupOptions | RollupOptions[] => {
+	const { collectLicenses, writeLicense } = getLicenseHandler();
+	const commonJSBuild: RollupOptions = {
+		// fsevents is a dependency of chokidar that cannot be bundled as it contains binary code
+		external: [
+			'buffer',
+			'@rollup/plugin-typescript',
+			'assert',
+			'crypto',
+			'events',
+			'fs',
+			'fsevents',
+			'module',
+			'path',
+			'os',
+			'stream',
+			'url',
+			'util'
+		],
+		input: 'cli/cli.ts',
+		onwarn,
+		output: {
+			banner,
+			// TODO Only loadConfigFile is using default exports mode; this should be changed in Rollup@3
+			exports: 'auto',
+			externalLiveBindings: false,
+			file: 'dist-static/rollup',
+			format: 'cjs',
+			freeze: false,
+			inlineDynamicImports: true,
+			interop: id => {
+				if (id === 'fsevents') {
+					return 'defaultOnly';
+				}
+				return 'default';
+			},
+			sourcemap: false
+		},
+		plugins: [
+			...nodePlugins,
+			esmDynamicImport(),
+			// TODO this relied on an unpublished type update
+			(!command.configTest && collectLicenses()) as Plugin
+		],
+		strictDeprecations: true,
+		treeshake
+	};
+
+	return [commonJSBuild];
+};