Update to `@rollup/plugin-babel` (#30742)

3 files changed, 6 insertions, 22 deletions

diff --git a/build/babel-helpers.js b/build/babel-helpers.js
deleted file mode 100644
index 30a5156771..0000000000
--- a/build/babel-helpers.js
+++ /dev/null
@@ -1,14 +0,0 @@
-'use strict'
-
-// These are the babel helpers we whitelist
-const helpers = [
-  'createClass',
-  'createSuper',
-  'defineProperties',
-  'defineProperty',
-  'getPrototypeOf',
-  'inheritsLoose',
-  'objectSpread2'
-]
-
-module.exports = helpers
diff --git a/build/build-plugins.js b/build/build-plugins.js
index 44d155c4f9..c57c53ce4e 100644
--- a/build/build-plugins.js
+++ b/build/build-plugins.js
@@ -11,16 +11,15 @@
 
 const path = require('path')
 const rollup = require('rollup')
-const babel = require('rollup-plugin-babel')
+const { babel } = require('@rollup/plugin-babel')
 const banner = require('./banner.js')
-const babelHelpers = require('./babel-helpers.js')
 
 const plugins = [
   babel({
     // Only transpile our source code
     exclude: 'node_modules/**',
-    // Include only required helpers
-    externalHelpersWhitelist: babelHelpers
+    // Inline the required helpers in each file
+    babelHelpers: 'inline'
   })
 ]
 const bsPlugins = {
diff --git a/build/rollup.config.js b/build/rollup.config.js
index d32346e101..a792502172 100644
--- a/build/rollup.config.js
+++ b/build/rollup.config.js
@@ -1,10 +1,9 @@
 'use strict'
 
 const path = require('path')
-const babel = require('rollup-plugin-babel')
+const { babel } = require('@rollup/plugin-babel')
 const resolve = require('@rollup/plugin-node-resolve')
 const banner = require('./banner.js')
-const babelHelpers = require('./babel-helpers.js')
 
 const BUNDLE = process.env.BUNDLE === 'true'
 const ESM = process.env.ESM === 'true'
@@ -15,8 +14,8 @@ const plugins = [
   babel({
   // Only transpile our source code
     exclude: 'node_modules/**',
-    // Include only required helpers
-    externalHelpersWhitelist: babelHelpers
+    // Include the helpers in the bundle, at most one copy of each
+    babelHelpers: 'bundled'
   })
 ]
 const globals = {