minify helpers before lumping them into helpers-generated.ts

packages/babel-helpers/package.json

@@ -20,7 +20,8 @@
     "@babel/types": "workspace:^"
   },
   "devDependencies": {
-    "@babel/helper-plugin-test-runner": "workspace:^"
+    "@babel/helper-plugin-test-runner": "workspace:^",
+    "terser": "^5.9.0"
   },
   "engines": {
     "node": ">=6.9.0"

packages/babel-helpers/scripts/generate-helpers.js

@@ -1,6 +1,7 @@
 import fs from "fs";
 import { join } from "path";
 import { URL, fileURLToPath } from "url";
+import { minify } from "terser"; // eslint-disable-line
 
 const HELPERS_FOLDER = new URL("../src/helpers", import.meta.url);
 const IGNORED_FILES = new Set(["package.json"]);
@@ -44,17 +45,15 @@ export default Object.freeze({
     }
     const { minVersion } = minVersionMatch.groups;
 
-    // TODO: We can minify the helpers in production
-    const source = fileContents
-      // Remove comments
-      .replace(/\/\*[^]*?\*\/|\/\/.*/g, "")
-      // Remove multiple newlines
-      .replace(/\n{2,}/g, "\n");
+    const source = await minify(fileContents, {
+      compress: false,
+      mangle: false,
+    });
 
     output += `\
   ${JSON.stringify(helperName)}: helper(
     ${JSON.stringify(minVersion)},
-    ${JSON.stringify(source)},
+    ${JSON.stringify(source.code)},
   ),
 `;
   }

yarn.lock

@@ -971,6 +971,7 @@ __metadata:
     "@babel/template": "workspace:^"
     "@babel/traverse": "workspace:^"
     "@babel/types": "workspace:^"
+    terser: ^5.9.0
   languageName: unknown
   linkType: soft
 
@@ -14003,6 +14004,16 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"source-map-support@npm:~0.5.20":
+  version: 0.5.20
+  resolution: "source-map-support@npm:0.5.20"
+  dependencies:
+    buffer-from: ^1.0.0
+    source-map: ^0.6.0
+  checksum: 43946aff452011960d16154304b11011e0185549493e65dd90da045959409fb2d266ba1c854fff3d5949f8e59382e3fcc7f7c5fa66136007a6750ad06c6c0baa
+  languageName: node
+  linkType: hard
+
 "source-map-url@npm:^0.4.0":
   version: 0.4.0
   resolution: "source-map-url@npm:0.4.0"
@@ -14630,6 +14641,19 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"terser@npm:^5.9.0":
+  version: 5.9.0
+  resolution: "terser@npm:5.9.0"
+  dependencies:
+    commander: ^2.20.0
+    source-map: ~0.7.2
+    source-map-support: ~0.5.20
+  bin:
+    terser: bin/terser
+  checksum: 11c1246b1991015a8881742878af779e3863fad42f626ffda957dbf28c94bf51e7994cffb9ffbec86ff3c23ab45ffa6d79d453c15e664306e35fc7b2c4eee5f4
+  languageName: node
+  linkType: hard
+
 "test-exclude@npm:^6.0.0":
   version: 6.0.0
   resolution: "test-exclude@npm:6.0.0"