First commit

node_modules/rollup-plugin-babel/src/helperPlugin.js

@@ -0,0 +1,21 @@
+import { HELPERS } from './constants.js';
+import { addNamed } from '@babel/helper-module-imports';
+
+export default function importHelperPlugin() {
+	return {
+		pre(file) {
+			const cachedHelpers = {};
+			file.set('helperGenerator', name => {
+				if (!file.availableHelper(name)) {
+					return;
+				}
+
+				if (cachedHelpers[name]) {
+					return cachedHelpers[name];
+				}
+
+				return (cachedHelpers[name] = addNamed(file.path, name, HELPERS));
+			});
+		},
+	};
+}