fix(docs): minify code.js automatically (pouchdb#9051)

Previously minification seemed to happen "offline", and both source and minified file were tracked in git.

This also prevents the unused source file `code.js` from being served at https://pouchdb.com/static/js/code.js

bin/build-site.js

@@ -11,6 +11,7 @@ const Path = require('node:path');
 var replace = require('replace');
 var mkdirp = require('mkdirp');
 var cssmin = require('cssmin');
+const terser = require('terser');
 
 const POUCHDB_CSS = resolvePath('docs/static/css/pouchdb.css');
 const POUCHDB_LESS = resolvePath('docs/static/less/pouchdb/pouchdb.less');
@@ -43,6 +44,26 @@ function buildJekyll(path) {
     return highlightEs6();
   }).then(function () {
     console.log('=> Highlighted ES6');
+
+    const srcPath = resolvePath('docs/src/code.js');
+    const targetPath = resolvePath('docs/_site/static/js/code.min.js');
+    const src = fs.readFileSync(srcPath, { encoding:'utf8' });
+    const mangle = { toplevel: true };
+    const output = { ascii_only: true };
+    const { code, error } = terser.minify(src, { mangle, output });
+    if (error) {
+      if (process.env.BUILD) {
+        throw error;
+      } else {
+        console.log(
+          `Javascript minification failed on line ${error.line} col ${error.col}:`,
+          error.message,
+        );
+      }
+    } else {
+      fs.writeFileSync(targetPath, code);
+      console.log('Minified javascript.');
+    }
   });
 }
 

docs/_config.yml

@@ -11,3 +11,5 @@ github:
 collections:
   guides:
     output: true
+exclude:
+  - src