feature: minify: add ability to use terser to minify JavaScript

README.md

@@ -150,6 +150,26 @@ For cli use these options can be provided in a JSON file named `.minify.json` li
 
 **Minify** walking up parent directories to locate and read it’s configuration file `.minify.json`.
 
+### `js`
+
+In section related to `js` you can choose `type` of minifier:
+- `putout` (default);
+- [`terser`](https://github.com/terser/terser);
+
+When you want to pass [options](https://github.com/terser/terser#minify-options) to `terser`, use section with the same name, `.minify.json` will look this way:
+
+```json
+{
+  "js": {
+    "type": "terser",
+    "terser": {
+      "mangle": false
+    }
+  }
+}
+```
+
+
 ## License
 
 MIT

lib/js.js

@@ -12,5 +12,13 @@ export default async (data, userOptions) => {
 
     const options = userOptions?.js || {};
 
+    if (options.type === 'terser') {
+        const {terser} = options;
+        const {minify} = await import('terser');
+        const {code} = await minify(data, terser);
+
+        return code;
+    }
+
     return await minify(data, options);
 };

package.json

@@ -40,6 +40,7 @@
     "html-minifier-terser": "^7.1.0",
     "readjson": "^2.2.2",
     "simport": "^1.2.0",
+    "terser": "^5.28.1",
     "try-catch": "^3.0.0",
     "try-to-catch": "^3.0.0"
   },

test/minify.js

@@ -4,6 +4,7 @@ import {dirname} from 'node:path';
 import tryToCatch from 'try-to-catch';
 import test from 'supertape';
 import CleanCSS from 'clean-css';
+import {minify as terserMinify} from 'terser';
 import {minify as putoutMinify} from '@putout/minify';
 import htmlMinifier from 'html-minifier-terser';
 import {minify} from '../lib/minify.js';
@@ -21,6 +22,20 @@ test('minify: js', async (t) => {
     t.end();
 });
 
+test('minify: js: terser', async (t) => {
+    const js = 'hello(`x`); function hello(world) {\nconsole.log(world);\n}';
+
+    const {code} = await terserMinify(js);
+    const result = await minify.js(js, {
+        js: {
+            type: 'terser',
+        },
+    });
+
+    t.equal(code, result);
+    t.end();
+});
+
 test('minify: auto', async (t) => {
     const js = 'function hello(world) {\nconsole.log(world);\n}';