fix(babel): Make transform runtime optional

By setting the flag "noRuntime" in a babel config file one can now
disable @babel/plugin-transform-runtime.

Author: adambrgmn

packages/babel-preset-base/__tests__/preset.spec.ts

@@ -71,8 +71,9 @@ describe('preset in module', () => {
 			noImportMeta: true,
 			noClassProperties: true,
 			noJsonStrings: true,
+			noRuntime: true,
 		});
-		expect(plugins).toHaveLength(1);
+		expect(plugins).toHaveLength(0);
 	});
 
 	describe('for @babel/preset-env', () => {

packages/babel-preset-base/src/preset.ts

@@ -74,6 +74,15 @@ export const preset = (opts: PresetOptions | null = {}) => {
 			{ loose: false },
 		],
 		noJsonStrings: '@babel/plugin-proposal-json-strings',
+		noRuntime: [
+			'@babel/plugin-transform-runtime',
+			{
+				corejs: false,
+				helpers: true,
+				regenerator: true,
+				useESModules: true,
+			},
+		],
 	};
 	// Add them, only if user hasn't explicitly disabled it
 	Object.keys(wannabePlugins).forEach((pKey: string) => {
@@ -82,18 +91,6 @@ export const preset = (opts: PresetOptions | null = {}) => {
 		}
 	});
 
-	// We include @babel/plugin-transform-runtime by default in order to
-	// properly transform e.g. async/await
-	plugins.push([
-		'@babel/plugin-transform-runtime',
-		{
-			corejs: false,
-			helpers: true,
-			regenerator: true,
-			useESModules: true,
-		},
-	]);
-
 	// Return the preset and some of stage-3 plugins
 	// We will remove them, once it becomes stage-4, i.e included in preset-env
 	return {