Update

scripts/build.ts

@@ -6,6 +6,7 @@ import esbuild from 'esbuild';
 import type { Plugin } from 'esbuild';
 import { memoize } from 'lodash';
 import { gray, green } from 'picocolors';
+import { minify_sync } from 'terser';
 import { dependencies } from '../dist/package.json';
 import { buildLocalRules } from './build-local-rules';
 import { dts } from './dts';
@@ -65,15 +66,15 @@ if (process.env.DEBUG) {
   });
 }
 
-function bundle(
+async function bundle(
   entry: string,
   outfile = entry
     .replace('./packages/', './dist/')
     .replace('src/', '')
     .replace('.ts', '.js'),
-  options?: esbuild.BuildOptions,
+  options?: esbuild.BuildOptions & { treeShaking?: boolean },
 ) {
-  return esbuild.build({
+  const output = await esbuild.build({
     entryPoints: [entry],
     outfile,
     bundle: true,
@@ -90,6 +91,30 @@ function bundle(
     },
     ...options,
   });
+
+  if (options?.treeShaking) {
+    const [text, setText] = await useText(outfile);
+    const minified = minify_sync(text, {
+      module: true,
+      compress: {
+        conditionals: true,
+        dead_code: true,
+        defaults: false,
+        evaluate: true,
+        passes: 3,
+        pure_new: true,
+        side_effects: true,
+        unused: true,
+      },
+      mangle: false,
+      format: {
+        comments: true,
+      },
+    });
+    setText(minified.code!);
+  }
+
+  return output;
 }
 
 async function editPackageJson() {
@@ -134,6 +159,9 @@ async function main() {
   bundleType('./src/prettier.ts', './dist/prettier.d.ts');
   bundleType('./src/types.ts', './dist/types.d.ts');
 
+  const unminify = { minify: false };
+  const treeShake = { treeShaking: true, minify: false };
+
   console.log('Building packages...');
   await Promise.all([
     bundle('./packages/eslint-plugin-jsx-a11y/src/index.js'),
@@ -142,10 +170,10 @@ async function main() {
     bundle('./packages/eslint-import-resolver-typescript/src/index.ts'),
     bundle('./src/rules/index.ts', './dist/eslint-plugin-rules/index.js'),
     bundle('./src/local/index.ts', './dist/eslint-plugin-local/index.js'),
-    bundle('./src/index.ts', './dist/index.js'),
-    bundle('./src/types.ts', './dist/types.js'),
-    bundle('./src/prettier.ts', './dist/prettier.js'),
-    bundle('./src/install.ts', './dist/install.js', { minify: false }),
+    bundle('./src/index.ts', './dist/index.js', unminify),
+    bundle('./src/types.ts', './dist/types.js', unminify),
+    bundle('./src/prettier.ts', './dist/prettier.js', unminify),
+    bundle('./src/install.ts', './dist/install.js', treeShake),
     editPackageJson(),
   ]);