Change trailing comma option for polyfill scripts (#5939)

packages/babel-polyfill/scripts/.eslintrc

@@ -0,0 +1,5 @@
+{
+  "rules": {
+    "prettier/prettier": ["error", { "trailingComma": "es5" }]
+  }
+}

packages/babel-polyfill/scripts/make-separate-polyfill-files.js

@@ -15,11 +15,11 @@ polyfills
   .forEach(polyfill => {
     fs.writeFileSync(
       relative(`src/core-js/modules/${polyfill}.js`),
-      `require("core-js/modules/${polyfill}");`,
+      `require("core-js/modules/${polyfill}");`
     );
   });
 
 fs.writeFileSync(
   relative("src/regenerator-runtime/runtime.js"),
-  'require("regenerator-runtime/runtime");',
+  'require("regenerator-runtime/runtime");'
 );

packages/babel-polyfill/scripts/prepublish.js

@@ -9,5 +9,5 @@ function relative(loc) {
 
 fs.writeFileSync(
   relative("browser.js"),
-  fs.readFileSync(relative("dist/polyfill.min.js")),
+  fs.readFileSync(relative("dist/polyfill.min.js"))
 );