rollup-plugin-babel - npm Package Compare versions

Comparing version 4.0.0-beta.5 to 4.0.0-beta.6

dist/rollup-plugin-babel.cjs.js

@@ -5,4 +5,4 @@ 'use strict';
 var core = require('@babel/core');
+var helperModuleImports = require('@babel/helper-module-imports');
 var rollupPluginutils = require('rollup-pluginutils');
-var helperModuleImports = require('@babel/helper-module-imports');
 
@@ -17,2 +17,15 @@ var INLINE = {};
 
+var MODULE_ERROR =
+	'Rollup requires that your Babel configuration keeps ES6 module syntax intact. ' +
+	'Unfortunately it looks like your configuration specifies a module transformer ' +
+	'to replace ES6 modules with another module format. To continue you have to disable it.' +
+	'\n\n' +
+	'Most commonly it\'s a CommonJS transform added by @babel/preset-env - ' +
+	'in such case you should disable it by adding `modules: false` option to that preset ' +
+	'(described in more detail here - https://github.com/rollup/rollup-plugin-babel#modules ).';
+
+var UNEXPECTED_ERROR =
+	'An unexpected situation arose. Please raise an issue at ' +
+	'https://github.com/rollup/rollup-plugin-babel/issues. Thanks!';
+
 function fallbackClassTransform () {
@@ -28,39 +41,43 @@ return {
 
-var preflightCheckResults = {};
+function createPreflightCheck () {
+	var preflightCheckResults = {};
 
-function preflightCheck ( options, dir ) {
-	if ( !preflightCheckResults[ dir ] ) {
-		var helpers;
+	return function ( ctx, options, dir ) {
+		if ( !preflightCheckResults[ dir ] ) {
+			var helpers;
 
-		options = Object.assign( {}, options );
-		delete options.only;
-		delete options.ignore;
+			options = Object.assign( {}, options );
+			delete options.only;
+			delete options.ignore;
 
-		options.filename = path.join( dir, 'x.js' );
+			options.filename = path.join( dir, 'x.js' );
 
-		var inputCode = 'class Foo extends Bar {};\nexport default Foo;';
-		var check = core.transform( inputCode, options ).code;
+			var inputCode = 'class Foo extends Bar {};\nexport default Foo;';
+			var check = core.transform( inputCode, options ).code;
 
-		if ( ~check.indexOf('class ') ) {
-			options.plugins = (options.plugins || []).concat( fallbackClassTransform );
-			check = core.transform( inputCode, options ).code;
-		}
+			if ( ~check.indexOf('class ') ) {
+				options.plugins = (options.plugins || []).concat( fallbackClassTransform );
+				check = core.transform( inputCode, options ).code;
+			}
 
-		if ( ~check.indexOf( 'import _inherits' ) ) { helpers = RUNTIME; }
-		else if ( ~check.indexOf( 'function _inherits' ) ) { helpers = INLINE; }
-		else if ( ~check.indexOf( 'babelHelpers' ) ) { helpers = EXTERNAL; }
-		else {
-			throw new Error( 'An unexpected situation arose. Please raise an issue at https://github.com/rollup/rollup-plugin-babel/issues. Thanks!' );
-		}
+			if (
+				!~check.indexOf( 'export default' ) &&
+				!~check.indexOf( 'export default Foo' ) &&
+				!~check.indexOf( 'export { Foo as default }' )
+			) {
+				ctx.error( MODULE_ERROR );
+			}
 
-		if (
-			!~check.indexOf( 'export default' ) &&
-			!~check.indexOf( 'export default Foo' ) &&
-			!~check.indexOf( 'export { Foo as default }' )
-		) { throw new Error( 'It looks like your Babel configuration specifies a module transformer. Please disable it. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' ); }
+			if ( ~check.indexOf( '/helpers/inherits' ) ) { helpers = RUNTIME; }
+			else if ( ~check.indexOf( 'function _inherits' ) ) { helpers = INLINE; }
+			else if ( ~check.indexOf( 'babelHelpers' ) ) { helpers = EXTERNAL; }
+			else {
+				ctx.error( UNEXPECTED_ERROR );
+			}
 
-		preflightCheckResults[ dir ] = helpers;
-	}
+			preflightCheckResults[ dir ] = helpers;
+		}
 
-	return preflightCheckResults[ dir ];
+		return preflightCheckResults[ dir ];
+	};
 }
@@ -83,39 +100,39 @@
 var warned = {};
-function warnOnce ( warn, msg ) {
+function warnOnce ( ctx, msg ) {
 	if ( warned[ msg ] ) { return; }
 	warned[ msg ] = true;
-	warn( msg );
+	ctx.warn( msg );
 }
 
-function babel ( options ) {
-	options = Object.assign( {}, options || {} );
+function objectWithoutProperties (obj, exclude) { var target = {}; for (var k in obj) if (Object.prototype.hasOwnProperty.call(obj, k) && exclude.indexOf(k) === -1) target[k] = obj[k]; return target; }
 
-	var filter = rollupPluginutils.createFilter( options.include, options.exclude );
-	delete options.include;
-	delete options.exclude;
+var unpackOptions = function (ref) {
+	if ( ref === void 0 ) ref = {};
+	var sourcemap = ref.sourcemap; if ( sourcemap === void 0 ) sourcemap = true;
+	var sourcemaps = ref.sourcemaps; if ( sourcemaps === void 0 ) sourcemaps = true;
+	var sourceMap = ref.sourceMap; if ( sourceMap === void 0 ) sourceMap = true;
+	var sourceMaps = ref.sourceMaps; if ( sourceMaps === void 0 ) sourceMaps = true;
+	var rest$1 = objectWithoutProperties( ref, ["sourcemap", "sourcemaps", "sourceMap", "sourceMaps"] );
+	var rest = rest$1;
 
-	if ( options.sourceMap !== false ) { options.sourceMaps = true; }
-	if ( options.sourceMaps !== false ) { options.sourceMaps = true; }
-	delete options.sourceMap;
+	return (Object.assign({}, {sourceMaps: sourcemap && sourcemaps && sourceMap && sourceMaps},
+	rest));
+};
 
-	var runtimeHelpers = options.runtimeHelpers;
-	delete options.runtimeHelpers;
+function babel ( options ) {
+	var ref = unpackOptions(options);
+	var exclude = ref.exclude;
+	var externalHelpers = ref.externalHelpers;
+	var externalHelpersWhitelist = ref.externalHelpersWhitelist;
+	var include = ref.include;
+	var runtimeHelpers = ref.runtimeHelpers;
+	var rest = objectWithoutProperties( ref, ["exclude", "externalHelpers", "externalHelpersWhitelist", "include", "runtimeHelpers"] );
+	var babelOptions = rest;
 
-	var externalHelpers;
-	if ( options.externalHelpers ) { externalHelpers = true; }
-	delete options.externalHelpers;
+	var filter = rollupPluginutils.createFilter( include, exclude );
+	var preflightCheck = createPreflightCheck();
 
-	var externalHelpersWhitelist = null;
-	if ( options.externalHelpersWhitelist ) { externalHelpersWhitelist = options.externalHelpersWhitelist; }
-	delete options.externalHelpersWhitelist;
-
-	var warn = function (msg) { return console.warn(msg); }; // eslint-disable-line no-console
-
 	return {
 		name: 'babel',
 
-		options: function options ( options$1 ) {
-			warn = options$1.onwarn || warn;
-		},
-
 		resolveId: function resolveId ( id ) {
@@ -137,11 +154,11 @@ if ( id === HELPERS ) { return id; }
 
-			var helpers = preflightCheck( options, path.dirname( id ) );
+			var helpers = preflightCheck( this, babelOptions, path.dirname( id ) );
 
 			if ( helpers === EXTERNAL && !externalHelpers ) {
-				warnOnce( warn, 'Using "external-helpers" plugin with rollup-plugin-babel is deprecated, as it now automatically deduplicates your Babel helpers.' );
+				warnOnce( this, 'Using "external-helpers" plugin with rollup-plugin-babel is deprecated, as it now automatically deduplicates your Babel helpers.' );
 			} else if ( helpers === RUNTIME && !runtimeHelpers ) {
-				throw new Error( 'Runtime helpers are not enabled. Either exclude the transform-runtime Babel plugin or pass the `runtimeHelpers: true` option. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' );
+				this.error( 'Runtime helpers are not enabled. Either exclude the transform-runtime Babel plugin or pass the `runtimeHelpers: true` option. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' );
 			}
 
-			var localOpts = Object.assign({ filename: id }, options);
+			var localOpts = Object.assign({ filename: id }, babelOptions);
 
@@ -148,0 +165,0 @@ if ( helpers !== RUNTIME ) {

dist/rollup-plugin-babel.es.js

@@ -1,5 +0,5 @@
-import { dirname, join } from 'path';
-import { buildExternalHelpers, transform } from '@babel/core';
+import { join, dirname } from 'path';
+import { transform, buildExternalHelpers } from '@babel/core';
+import { addNamed } from '@babel/helper-module-imports';
 import { createFilter } from 'rollup-pluginutils';
-import { addNamed } from '@babel/helper-module-imports';
 
@@ -14,7 +14,20 @@ var INLINE = {};
 
+var MODULE_ERROR =
+	'Rollup requires that your Babel configuration keeps ES6 module syntax intact. ' +
+	'Unfortunately it looks like your configuration specifies a module transformer ' +
+	'to replace ES6 modules with another module format. To continue you have to disable it.' +
+	'\n\n' +
+	'Most commonly it\'s a CommonJS transform added by @babel/preset-env - ' +
+	'in such case you should disable it by adding `modules: false` option to that preset ' +
+	'(described in more detail here - https://github.com/rollup/rollup-plugin-babel#modules ).';
+
+var UNEXPECTED_ERROR =
+	'An unexpected situation arose. Please raise an issue at ' +
+	'https://github.com/rollup/rollup-plugin-babel/issues. Thanks!';
+
 function fallbackClassTransform () {
 	return {
 		visitor: {
-			ClassDeclaration: function ClassDeclaration (path$$1, state) {
-				path$$1.replaceWith(path$$1, state.file.addHelper('inherits'));
+			ClassDeclaration: function ClassDeclaration (path, state) {
+				path.replaceWith(path, state.file.addHelper('inherits'));
 			}
@@ -25,39 +38,43 @@ }
 
-var preflightCheckResults = {};
+function createPreflightCheck () {
+	var preflightCheckResults = {};
 
-function preflightCheck ( options, dir ) {
-	if ( !preflightCheckResults[ dir ] ) {
-		var helpers;
+	return function ( ctx, options, dir ) {
+		if ( !preflightCheckResults[ dir ] ) {
+			var helpers;
 
-		options = Object.assign( {}, options );
-		delete options.only;
-		delete options.ignore;
+			options = Object.assign( {}, options );
+			delete options.only;
+			delete options.ignore;
 
-		options.filename = join( dir, 'x.js' );
+			options.filename = join( dir, 'x.js' );
 
-		var inputCode = 'class Foo extends Bar {};\nexport default Foo;';
-		var check = transform( inputCode, options ).code;
+			var inputCode = 'class Foo extends Bar {};\nexport default Foo;';
+			var check = transform( inputCode, options ).code;
 
-		if ( ~check.indexOf('class ') ) {
-			options.plugins = (options.plugins || []).concat( fallbackClassTransform );
-			check = transform( inputCode, options ).code;
-		}
+			if ( ~check.indexOf('class ') ) {
+				options.plugins = (options.plugins || []).concat( fallbackClassTransform );
+				check = transform( inputCode, options ).code;
+			}
 
-		if ( ~check.indexOf( 'import _inherits' ) ) { helpers = RUNTIME; }
-		else if ( ~check.indexOf( 'function _inherits' ) ) { helpers = INLINE; }
-		else if ( ~check.indexOf( 'babelHelpers' ) ) { helpers = EXTERNAL; }
-		else {
-			throw new Error( 'An unexpected situation arose. Please raise an issue at https://github.com/rollup/rollup-plugin-babel/issues. Thanks!' );
-		}
+			if (
+				!~check.indexOf( 'export default' ) &&
+				!~check.indexOf( 'export default Foo' ) &&
+				!~check.indexOf( 'export { Foo as default }' )
+			) {
+				ctx.error( MODULE_ERROR );
+			}
 
-		if (
-			!~check.indexOf( 'export default' ) &&
-			!~check.indexOf( 'export default Foo' ) &&
-			!~check.indexOf( 'export { Foo as default }' )
-		) { throw new Error( 'It looks like your Babel configuration specifies a module transformer. Please disable it. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' ); }
+			if ( ~check.indexOf( '/helpers/inherits' ) ) { helpers = RUNTIME; }
+			else if ( ~check.indexOf( 'function _inherits' ) ) { helpers = INLINE; }
+			else if ( ~check.indexOf( 'babelHelpers' ) ) { helpers = EXTERNAL; }
+			else {
+				ctx.error( UNEXPECTED_ERROR );
+			}
 
-		preflightCheckResults[ dir ] = helpers;
-	}
+			preflightCheckResults[ dir ] = helpers;
+		}
 
-	return preflightCheckResults[ dir ];
+		return preflightCheckResults[ dir ];
+	};
 }
@@ -80,39 +97,39 @@
 var warned = {};
-function warnOnce ( warn, msg ) {
+function warnOnce ( ctx, msg ) {
 	if ( warned[ msg ] ) { return; }
 	warned[ msg ] = true;
-	warn( msg );
+	ctx.warn( msg );
 }
 
-function babel ( options ) {
-	options = Object.assign( {}, options || {} );
+function objectWithoutProperties (obj, exclude) { var target = {}; for (var k in obj) if (Object.prototype.hasOwnProperty.call(obj, k) && exclude.indexOf(k) === -1) target[k] = obj[k]; return target; }
 
-	var filter = createFilter( options.include, options.exclude );
-	delete options.include;
-	delete options.exclude;
+var unpackOptions = function (ref) {
+	if ( ref === void 0 ) ref = {};
+	var sourcemap = ref.sourcemap; if ( sourcemap === void 0 ) sourcemap = true;
+	var sourcemaps = ref.sourcemaps; if ( sourcemaps === void 0 ) sourcemaps = true;
+	var sourceMap = ref.sourceMap; if ( sourceMap === void 0 ) sourceMap = true;
+	var sourceMaps = ref.sourceMaps; if ( sourceMaps === void 0 ) sourceMaps = true;
+	var rest$1 = objectWithoutProperties( ref, ["sourcemap", "sourcemaps", "sourceMap", "sourceMaps"] );
+	var rest = rest$1;
 
-	if ( options.sourceMap !== false ) { options.sourceMaps = true; }
-	if ( options.sourceMaps !== false ) { options.sourceMaps = true; }
-	delete options.sourceMap;
+	return (Object.assign({}, {sourceMaps: sourcemap && sourcemaps && sourceMap && sourceMaps},
+	rest));
+};
 
-	var runtimeHelpers = options.runtimeHelpers;
-	delete options.runtimeHelpers;
+function babel ( options ) {
+	var ref = unpackOptions(options);
+	var exclude = ref.exclude;
+	var externalHelpers = ref.externalHelpers;
+	var externalHelpersWhitelist = ref.externalHelpersWhitelist;
+	var include = ref.include;
+	var runtimeHelpers = ref.runtimeHelpers;
+	var rest = objectWithoutProperties( ref, ["exclude", "externalHelpers", "externalHelpersWhitelist", "include", "runtimeHelpers"] );
+	var babelOptions = rest;
 
-	var externalHelpers;
-	if ( options.externalHelpers ) { externalHelpers = true; }
-	delete options.externalHelpers;
+	var filter = createFilter( include, exclude );
+	var preflightCheck = createPreflightCheck();
 
-	var externalHelpersWhitelist = null;
-	if ( options.externalHelpersWhitelist ) { externalHelpersWhitelist = options.externalHelpersWhitelist; }
-	delete options.externalHelpersWhitelist;
-
-	var warn = function (msg) { return console.warn(msg); }; // eslint-disable-line no-console
-
 	return {
 		name: 'babel',
 
-		options: function options ( options$1 ) {
-			warn = options$1.onwarn || warn;
-		},
-
 		resolveId: function resolveId ( id ) {
@@ -134,11 +151,11 @@ if ( id === HELPERS ) { return id; }
 
-			var helpers = preflightCheck( options, dirname( id ) );
+			var helpers = preflightCheck( this, babelOptions, dirname( id ) );
 
 			if ( helpers === EXTERNAL && !externalHelpers ) {
-				warnOnce( warn, 'Using "external-helpers" plugin with rollup-plugin-babel is deprecated, as it now automatically deduplicates your Babel helpers.' );
+				warnOnce( this, 'Using "external-helpers" plugin with rollup-plugin-babel is deprecated, as it now automatically deduplicates your Babel helpers.' );
 			} else if ( helpers === RUNTIME && !runtimeHelpers ) {
-				throw new Error( 'Runtime helpers are not enabled. Either exclude the transform-runtime Babel plugin or pass the `runtimeHelpers: true` option. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' );
+				this.error( 'Runtime helpers are not enabled. Either exclude the transform-runtime Babel plugin or pass the `runtimeHelpers: true` option. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' );
 			}
 
-			var localOpts = Object.assign({ filename: id }, options);
+			var localOpts = Object.assign({ filename: id }, babelOptions);
 
@@ -145,0 +162,0 @@ if ( helpers !== RUNTIME ) {

package.json

 {
   "name": "rollup-plugin-babel",
-  "version": "4.0.0-beta.5",
+  "version": "4.0.0-beta.6",
   "description": "Seamless integration between Rollup and Babel.",
@@ -36,4 +36,4 @@ "main": "dist/rollup-plugin-babel.cjs.js",
   "dependencies": {
-    "@babel/helper-module-imports": "7.0.0-beta.49",
-    "rollup-pluginutils": "^2.0.1"
+    "@babel/helper-module-imports": "7.0.0-beta.51",
+    "rollup-pluginutils": "^2.3.0"
   },
@@ -44,14 +44,14 @@ "peerDependencies": {
   "devDependencies": {
-    "@babel/core": "7.0.0-beta.49",
-    "@babel/plugin-external-helpers": "7.0.0-beta.49",
-    "@babel/plugin-proposal-decorators": "7.0.0-beta.49",
-    "@babel/plugin-transform-runtime": "7.0.0-beta.49",
-    "@babel/preset-env": "7.0.0-beta.49",
-    "buble": "^0.18.0",
-    "eslint": "^3.12.0",
-    "mocha": "^3.2.0",
-    "rollup": "^0.52.2",
-    "rollup-plugin-buble": "^0.18.0",
-    "source-map": "^0.5.6",
-    "source-map-support": "^0.4.6"
+    "@babel/core": "7.0.0-beta.51",
+    "@babel/plugin-external-helpers": "7.0.0-beta.51",
+    "@babel/plugin-proposal-decorators": "7.0.0-beta.51",
+    "@babel/plugin-transform-runtime": "7.0.0-beta.51",
+    "@babel/preset-env": "7.0.0-beta.51",
+    "buble": "^0.19.3",
+    "eslint": "^5.0.1",
+    "mocha": "^5.2.0",
+    "rollup": "^0.62.0",
+    "rollup-plugin-buble": "^0.19.2",
+    "source-map": "^0.6.1",
+    "source-map-support": "^0.5.6"
   },
@@ -58,0 +58,0 @@ "repository": "rollup/rollup-plugin-babel",

README.md

@@ -95,2 +95,11 @@ # rollup-plugin-babel
 
+However, setting `modules: false` in your `.babelrc` may conflict if you are using `babel-register`. To work around this, specify `babelrc: false` in your rollup config. This allows Rollup to bypass your `.babelrc` file. In order to use the `env` preset, you will also need to specify it with `modules: false` option:
+```js
+plugins: [
+  babel({
+    babelrc: false,
+    presets: [['env', { modules: false }]]
+  })
+]
+```
 ### Helpers
@@ -100,3 +109,3 @@
 
-By default, those helpers will be inserted at the top of the file being transformed, which can lead to duplication. It's therefore recommended that you use the `external-helpers` plugin, which is automatically included in the `es2015-rollup` preset. Rollup will combine the helpers in a single block at the top of your bundle.
+By default, those helpers will be inserted at the top of the file being transformed, which can lead to duplication. It's therefore recommended that you use the `external-helpers` plugin. Rollup will combine the helpers in a single block at the top of your bundle.
 
@@ -103,0 +112,0 @@ Alternatively, if you know what you're doing, you can use the `transform-runtime` plugin. If you do this, use `runtimeHelpers: true`:

src/index.js

 import { dirname } from 'path';
 import { buildExternalHelpers, transform } from '@babel/core';
 import { createFilter } from 'rollup-pluginutils';
-import preflightCheck from './preflightCheck.js';
+import createPreflightCheck from './preflightCheck.js';
 import helperPlugin from './helperPlugin.js';
@@ -9,33 +9,31 @@ import { warnOnce } from './utils.js';
 
+const unpackOptions = ({
+	// rollup uses sourcemap, babel uses sourceMaps
+	// just normalize them here so people don't have to worry about it
+	sourcemap = true,
+	sourcemaps = true,
+	sourceMap = true,
+	sourceMaps = true,
+	...rest
+} = {}) => ({
+	sourceMaps: sourcemap && sourcemaps && sourceMap && sourceMaps,
+	...rest
+});
+
 export default function babel ( options ) {
-	options = Object.assign( {}, options || {} );
+	const {
+		exclude,
+		externalHelpers,
+		externalHelpersWhitelist,
+		include,
+		runtimeHelpers,
+		...babelOptions
+	} = unpackOptions(options);
 
-	const filter = createFilter( options.include, options.exclude );
-	delete options.include;
-	delete options.exclude;
+	const filter = createFilter( include, exclude );
+	const preflightCheck = createPreflightCheck();
 
-	if ( options.sourceMap !== false ) options.sourceMaps = true;
-	if ( options.sourceMaps !== false ) options.sourceMaps = true;
-	delete options.sourceMap;
-
-	const runtimeHelpers = options.runtimeHelpers;
-	delete options.runtimeHelpers;
-
-	let externalHelpers;
-	if ( options.externalHelpers ) externalHelpers = true;
-	delete options.externalHelpers;
-
-	let externalHelpersWhitelist = null;
-	if ( options.externalHelpersWhitelist ) externalHelpersWhitelist = options.externalHelpersWhitelist;
-	delete options.externalHelpersWhitelist;
-
-	let warn = msg => console.warn(msg); // eslint-disable-line no-console
-
 	return {
 		name: 'babel',
 
-		options ( options ) {
-			warn = options.onwarn || warn;
-		},
-
 		resolveId ( id ) {
@@ -57,11 +55,11 @@ if ( id === HELPERS ) return id;
 
-			const helpers = preflightCheck( options, dirname( id ) );
+			const helpers = preflightCheck( this, babelOptions, dirname( id ) );
 
 			if ( helpers === EXTERNAL && !externalHelpers ) {
-				warnOnce( warn, 'Using "external-helpers" plugin with rollup-plugin-babel is deprecated, as it now automatically deduplicates your Babel helpers.' );
+				warnOnce( this, 'Using "external-helpers" plugin with rollup-plugin-babel is deprecated, as it now automatically deduplicates your Babel helpers.' );
 			} else if ( helpers === RUNTIME && !runtimeHelpers ) {
-				throw new Error( 'Runtime helpers are not enabled. Either exclude the transform-runtime Babel plugin or pass the `runtimeHelpers: true` option. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' );
+				this.error( 'Runtime helpers are not enabled. Either exclude the transform-runtime Babel plugin or pass the `runtimeHelpers: true` option. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' );
 			}
 
-			let localOpts = Object.assign({ filename: id }, options);
+			let localOpts = Object.assign({ filename: id }, babelOptions);
 
@@ -68,0 +66,0 @@ if ( helpers !== RUNTIME ) {

src/preflightCheck.js

@@ -5,2 +5,15 @@ import { join } from 'path';
 
+const MODULE_ERROR =
+	'Rollup requires that your Babel configuration keeps ES6 module syntax intact. ' +
+	'Unfortunately it looks like your configuration specifies a module transformer ' +
+	'to replace ES6 modules with another module format. To continue you have to disable it.' +
+	'\n\n' +
+	'Most commonly it\'s a CommonJS transform added by @babel/preset-env - ' +
+	'in such case you should disable it by adding `modules: false` option to that preset ' +
+	'(described in more detail here - https://github.com/rollup/rollup-plugin-babel#modules ).';
+
+const UNEXPECTED_ERROR =
+	'An unexpected situation arose. Please raise an issue at ' +
+	'https://github.com/rollup/rollup-plugin-babel/issues. Thanks!';
+
 function fallbackClassTransform () {
@@ -16,39 +29,43 @@ return {
 
-let preflightCheckResults = {};
+export default function createPreflightCheck () {
+	let preflightCheckResults = {};
 
-export default function preflightCheck ( options, dir ) {
-	if ( !preflightCheckResults[ dir ] ) {
-		let helpers;
+	return ( ctx, options, dir ) => {
+		if ( !preflightCheckResults[ dir ] ) {
+			let helpers;
 
-		options = Object.assign( {}, options );
-		delete options.only;
-		delete options.ignore;
+			options = Object.assign( {}, options );
+			delete options.only;
+			delete options.ignore;
 
-		options.filename = join( dir, 'x.js' );
+			options.filename = join( dir, 'x.js' );
 
-		const inputCode = 'class Foo extends Bar {};\nexport default Foo;';
-		let check = transform( inputCode, options ).code;
+			const inputCode = 'class Foo extends Bar {};\nexport default Foo;';
+			let check = transform( inputCode, options ).code;
 
-		if ( ~check.indexOf('class ') ) {
-			options.plugins = (options.plugins || []).concat( fallbackClassTransform );
-			check = transform( inputCode, options ).code;
-		}
+			if ( ~check.indexOf('class ') ) {
+				options.plugins = (options.plugins || []).concat( fallbackClassTransform );
+				check = transform( inputCode, options ).code;
+			}
 
-		if ( ~check.indexOf( 'import _inherits' ) ) helpers = RUNTIME;
-		else if ( ~check.indexOf( 'function _inherits' ) ) helpers = INLINE;
-		else if ( ~check.indexOf( 'babelHelpers' ) ) helpers = EXTERNAL;
-		else {
-			throw new Error( 'An unexpected situation arose. Please raise an issue at https://github.com/rollup/rollup-plugin-babel/issues. Thanks!' );
-		}
+			if (
+				!~check.indexOf( 'export default' ) &&
+				!~check.indexOf( 'export default Foo' ) &&
+				!~check.indexOf( 'export { Foo as default }' )
+			) {
+				ctx.error( MODULE_ERROR );
+			}
 
-		if (
-			!~check.indexOf( 'export default' ) &&
-			!~check.indexOf( 'export default Foo' ) &&
-			!~check.indexOf( 'export { Foo as default }' )
-		) throw new Error( 'It looks like your Babel configuration specifies a module transformer. Please disable it. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' );
+			if ( ~check.indexOf( '/helpers/inherits' ) ) helpers = RUNTIME;
+			else if ( ~check.indexOf( 'function _inherits' ) ) helpers = INLINE;
+			else if ( ~check.indexOf( 'babelHelpers' ) ) helpers = EXTERNAL;
+			else {
+				ctx.error( UNEXPECTED_ERROR );
+			}
 
-		preflightCheckResults[ dir ] = helpers;
-	}
+			preflightCheckResults[ dir ] = helpers;
+		}
 
-	return preflightCheckResults[ dir ];
+		return preflightCheckResults[ dir ];
+	};
 }

src/utils.js

 let warned = {};
-export function warnOnce ( warn, msg ) {
+export function warnOnce ( ctx, msg ) {
 	if ( warned[ msg ] ) return;
 	warned[ msg ] = true;
-	warn( msg );
+	ctx.warn( msg );
 }

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Improved metrics

Total package byte prevSize

28765

increased by9.35%

Lines of code

433

increased by14.25%

Number of lines in readme file

140

increased by6.87%

Dependency changes

• + Added@babel/helper-module-imports@7.0.0-beta.51(transitive)

• + Added@babel/types@7.0.0-beta.51(transitive)

• - Removed@babel/helper-module-imports@7.0.0-beta.49(transitive)

• - Removed@babel/types@7.0.0-beta.49(transitive)

• Updated@babel/helper-module-imports@7.0.0-beta.51

• Updatedrollup-pluginutils@^2.3.0