feat(terser): initial release (#1323)

* build(terser): add terser plugin to collection

* build(terser): add README.md notice

* fix(terser): test-suite + rollup plugin definition

* style(terser): applied prettier rules

* style(terser): apply prettier on root README.md + minor eslint fixes

* test(terser): removed snapshot test due incorrect path with ava

README.md

@@ -42,6 +42,7 @@ This repository houses plugins that Rollup considers critical to every day use o
 | [run](packages/run)                                 | Run your bundles in Node once they're built                                               |
 | [strip](packages/strip)                             | Remove debugger statements and functions like assert.equal and console.log from your code |
 | [sucrase](packages/sucrase)                         | Compile TypeScript, Flow, JSX, etc with Sucrase                                           |
+| [terser](packages/terser)                           | Generate a minified output bundle with terser                                             |
 | [typescript](packages/typescript)                   | Integration between Rollup and Typescript                                                 |
 | [url](packages/url)                                 | Import files as data-URIs or ES Modules                                                   |
 | [virtual](packages/virtual)                         | Load virtual modules from memory                                                          |

packages/terser/README.md

@@ -0,0 +1,59 @@
+[npm]: https://img.shields.io/npm/v/@rollup/plugin-terser
+[npm-url]: https://www.npmjs.com/package/@rollup/plugin-terser
+[size]: https://packagephobia.now.sh/badge?p=@rollup/plugin-terser
+[size-url]: https://packagephobia.now.sh/result?p=@rollup/plugin-terser
+
+[![npm][npm]][npm-url]
+[![size][size]][size-url]
+[![libera manifesto](https://img.shields.io/badge/libera-manifesto-lightgrey.svg)](https://liberamanifesto.com)
+
+# @rollup/plugin-terser
+
+🍣 A Rollup plugin to generate a minified output bundle.
+
+## Requirements
+
+This plugin requires an [LTS](https://github.com/nodejs/Release) Node version (v14.0.0+) and Rollup v1.20.0+.
+
+## Install
+
+Using npm:
+
+```console
+npm install @rollup/plugin-terser --save-dev
+```
+
+## Usage
+
+Create a `rollup.config.js` [configuration file](https://www.rollupjs.org/guide/en/#configuration-files) and import the plugin:
+
+```js
+import terser from '@rollup/plugin-terser';
+
+export default {
+  input: 'src/index.js',
+  output: {
+    dir: 'output',
+    format: 'cjs'
+  },
+  plugins: [terser()]
+};
+```
+
+Then call `rollup` either via the [CLI](https://www.rollupjs.org/guide/en/#command-line-reference) or the [API](https://www.rollupjs.org/guide/en/#javascript-api).
+
+## Options
+
+The plugin accepts a terser [Options](https://github.com/terser/terser#minify-options) object as input parameter,
+to modify the default behaviour.
+
+## Meta
+
+[CONTRIBUTING](/.github/CONTRIBUTING.md)
+
+[LICENSE (MIT)](/LICENSE)
+
+## Credits
+
+This package was originally developed by [https://github.com/TrySound](TrySound) but is not
+maintained anymore.

packages/terser/package.json

@@ -0,0 +1,71 @@
+{
+  "name": "@rollup/plugin-terser",
+  "version": "0.0.0",
+  "publishConfig": {
+    "access": "public"
+  },
+  "description": "Generate minified bundle",
+  "license": "MIT",
+  "repository": {
+    "url": "rollup/plugins",
+    "directory": "packages/terser"
+  },
+  "author": "Peter Placzek <peter.placzek1996@gmail.com>",
+  "homepage": "https://github.com/rollup/plugins/tree/master/packages/terser#readme",
+  "bugs": "https://github.com/rollup/plugins/issues",
+  "main": "dist/cjs/index.js",
+  "module": "dist/es/index.js",
+  "exports": {
+    "types": "./types/index.d.ts",
+    "import": "./dist/es/index.js",
+    "default": "./dist/cjs/index.js"
+  },
+  "engines": {
+    "node": ">=14.0.0"
+  },
+  "scripts": {
+    "build": "rollup -c",
+    "ci:coverage": "nyc pnpm test && nyc report --reporter=text-lcov > coverage.lcov",
+    "ci:lint": "pnpm build && pnpm lint",
+    "ci:lint:commits": "commitlint --from=${CIRCLE_BRANCH} --to=${CIRCLE_SHA1}",
+    "ci:test": "pnpm test -- --verbose && pnpm test:ts",
+    "prebuild": "del-cli dist",
+    "prepare": "if [ ! -d 'dist' ]; then pnpm build; fi",
+    "prerelease": "pnpm build",
+    "pretest": "pnpm build",
+    "release": "pnpm --workspace-root plugin:terser --pkg $npm_package_name",
+    "test": "ava",
+    "test:ts": "tsc types/index.d.ts test/types.ts --noEmit"
+  },
+  "files": [
+    "dist",
+    "!dist/**/*.map",
+    "src",
+    "types",
+    "README.md"
+  ],
+  "keywords": [
+    "rollup",
+    "plugin",
+    "terser",
+    "minify",
+    "npm",
+    "modules"
+  ],
+  "peerDependencies": {
+    "rollup": "^2.x || ^3.x"
+  },
+  "peerDependenciesMeta": {
+    "rollup": {
+      "optional": true
+    }
+  },
+  "dependencies": {
+    "terser": "^5.15.1"
+  },
+  "devDependencies": {
+    "rollup": "^3.0.0-7",
+    "typescript": "^4.8.3"
+  },
+  "types": "./types/index.d.ts"
+}

packages/terser/rollup.config.mjs

@@ -0,0 +1,10 @@
+import { readFileSync } from 'fs';
+
+import { createConfig } from '../../shared/rollup.config.mjs';
+
+export default {
+  ...createConfig({
+    pkg: JSON.parse(readFileSync(new URL('./package.json', import.meta.url), 'utf8'))
+  }),
+  input: 'src/index.ts'
+};

packages/terser/src/index.ts

@@ -0,0 +1,24 @@
+import { NormalizedOutputOptions, RenderedChunk } from 'rollup';
+import { minify, MinifyOptions } from 'terser';
+
+export default function terser(options?: MinifyOptions) {
+  return {
+    name: 'terser',
+
+    async renderChunk(code: string, chunk: RenderedChunk, outputOptions: NormalizedOutputOptions) {
+      const defaultOptions: MinifyOptions = {
+        sourceMap: outputOptions.sourcemap === true || typeof outputOptions.sourcemap === 'string'
+      };
+
+      if (outputOptions.format === 'es') {
+        defaultOptions.module = true;
+      }
+
+      if (outputOptions.format === 'cjs') {
+        defaultOptions.toplevel = true;
+      }
+
+      return minify(code, { ...defaultOptions, ...(options || {}) });
+    }
+  };
+}

packages/terser/test/fixtures/chunk-1.js

@@ -0,0 +1,2 @@
+const chunk1 = 'chunk-1';
+console.log(chunk1)

packages/terser/test/fixtures/chunk-2.js

@@ -0,0 +1,2 @@
+const chunk2 = 'chunk-2';
+console.log(chunk2)

packages/terser/test/fixtures/commented.js

@@ -0,0 +1,13 @@
+// eslint-disable-next-line no-undef
+window.a = 5;
+
+/* @preserve this comment */
+
+/* delete this comment */
+
+// and this one too
+
+// eslint-disable-next-line no-undef
+if (window.a < 3) {
+  console.log(4);
+}

packages/terser/test/fixtures/export-number.js

@@ -0,0 +1 @@
+export default 5;

packages/terser/test/fixtures/failed.js

@@ -0,0 +1,2 @@
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+const a = 1;

packages/terser/test/fixtures/plain-file.js

@@ -0,0 +1,4 @@
+
+
+const foo = 'bar';
+console.log(foo);

packages/terser/test/fixtures/properties-and-locals.js

@@ -0,0 +1,9 @@
+function recurse(count) {
+	if (count > 0) return recurse(count - 1);
+	return count;
+}
+const obj = {
+	foo: 1,
+	_priv: 2
+};
+console.log(obj, recurse(10));

packages/terser/test/fixtures/properties.js

@@ -0,0 +1,5 @@
+const obj = {
+	foo: 1,
+	_priv: 2
+};
+console.log(obj);

packages/terser/test/fixtures/sourcemap.js

@@ -0,0 +1,3 @@
+import result from './export-number.js';
+
+console.log(result);

packages/terser/test/fixtures/unminified.js

@@ -0,0 +1,7 @@
+// eslint-disable-next-line no-undef
+window.a = 5;
+
+// eslint-disable-next-line no-undef
+if (window.a < 3) {
+  console.log(4);
+}