refactore some stuff

src/Bundle.js

@@ -26,6 +26,7 @@ export default class Bundle {
 		this.statements = [];
 		this.externalModules = [];
 		this.defaultExportName = null;
+		this.internalNamespaceModules = [];
 	}
 
 	fetchModule ( importee, importer ) {
@@ -96,7 +97,7 @@ export default class Bundle {
 									defaultExportName = `_${defaultExportName}`;
 								}
 
-								this.defaultExportName = defaultExportName;
+								entryModule.suggestedNames.default = defaultExportName;
 								node._source.overwrite( node.start, node.declaration.start, `var ${defaultExportName} = ` );
 							}
 
@@ -184,6 +185,18 @@ export default class Bundle {
 			magicString.addSource( source );
 		});
 
+		// prepend bundle with internal namespaces
+		const indentString = magicString.getIndentString();
+		const namespaceBlock = this.internalNamespaceModules.map( module => {
+			const exportKeys = keys( module.exports );
+
+			return `var ${module.suggestedNames['*']} = {\n` +
+				exportKeys.map( key => `${indentString}get ${key} () { return ${module.getCanonicalName(key)}; }` ).join( ',\n' ) +
+			`\n};\n\n`;
+		}).join( '' );
+
+		magicString.prepend( namespaceBlock );
+
 		const finalise = finalisers[ options.format || 'es6' ];
 
 		if ( !finalise ) {

src/ExternalModule.js

@@ -7,7 +7,7 @@ export default class ExternalModule {
 		this.importedByBundle = [];
 
 		this.canonicalNames = {};
-		this.defaultExportName = null;
+		this.suggestedNames = {};
 
 		this.needsDefault = null;
 		this.needsNamed = null;
@@ -30,9 +30,9 @@ export default class ExternalModule {
 		this.canonicalNames[ name ] = replacement;
 	}
 
-	suggestDefaultName ( name ) {
-		if ( !this.defaultExportName ) {
-			this.defaultExportName = name;
+	suggestName ( exportName, suggestion ) {
+		if ( !this.suggestedNames[ exportName ] ) {
+			this.suggestedNames[ exportName ] = suggestion;
 		}
 	}
-}
+}

src/Module.js

@@ -6,6 +6,7 @@ import analyse from './ast/analyse';
 import { has } from './utils/object';
 import { sequence } from './utils/promise';
 import getLocation from './utils/getLocation';
+import makeLegalIdentifier from './utils/makeLegalIdentifier';
 
 const emptyArrayPromise = Promise.resolve([]);
 
@@ -19,6 +20,8 @@ export default class Module {
 			filename: path
 		});
 
+		this.suggestedNames = {};
+
 		try {
 			this.ast = parse( code, {
 				ecmaVersion: 6,
@@ -160,27 +163,41 @@ export default class Module {
 	}
 
 	getCanonicalName ( name ) {
-		if ( has( this.imports, name ) ) {
-			const importDeclaration = this.imports[ name ];
-			const module = importDeclaration.module;
+		if ( has( this.suggestedNames, name ) ) {
+			name = this.suggestedNames[ name ];
+		}
+
+		if ( !has( this.canonicalNames, name ) ) {
+			let canonicalName;
 
-			let exporterLocalName;
+			if ( has( this.imports, name ) ) {
+				const importDeclaration = this.imports[ name ];
+				const module = importDeclaration.module;
+
+				if ( importDeclaration.name === '*' ) {
+					canonicalName = module.suggestedNames[ '*' ];
+				} else {
+					let exporterLocalName;
+
+					if ( module.isExternal ) {
+						exporterLocalName = importDeclaration.name;
+					} else {
+						const exportDeclaration = module.exports[ importDeclaration.name ];
+						exporterLocalName = exportDeclaration.localName;
+					}
 
-			if ( module.isExternal ) {
-				exporterLocalName = importDeclaration.name;
-			} else {
-				const exportDeclaration = module.exports[ importDeclaration.name ];
-				exporterLocalName = exportDeclaration.localName;
+					canonicalName = module.getCanonicalName( exporterLocalName );
+				}
 			}
 
-			return module.getCanonicalName( exporterLocalName );
-		}
+			else {
+				canonicalName = name;
+			}
 
-		if ( name === 'default' ) {
-			name = this.defaultExportName;
+			this.canonicalNames[ name ] = canonicalName;
 		}
 
-		return has( this.canonicalNames, name ) ? this.canonicalNames[ name ] : name;
+		return this.canonicalNames[ name ];
 	}
 
 	define ( name ) {
@@ -200,7 +217,7 @@ export default class Module {
 					importDeclaration.module = module;
 
 					if ( importDeclaration.name === 'default' ) {
-						module.suggestDefaultName( importDeclaration.localName );
+						module.suggestName( 'default', importDeclaration.localName );
 					}
 
 					if ( module.isExternal ) {
@@ -214,6 +231,17 @@ export default class Module {
 						return emptyArrayPromise;
 					}
 
+					if ( importDeclaration.name === '*' ) {
+						module.suggestName( '*', importDeclaration.localName );
+
+						// we need to create an internal namespace
+						if ( !~this.bundle.internalNamespaceModules.indexOf( module ) ) {
+							this.bundle.internalNamespaceModules.push( module );
+						}
+
+						return module.includeAllStatements();
+					}
+
 					const exportDeclaration = module.exports[ importDeclaration.name ];
 
 					if ( !exportDeclaration ) {
@@ -237,7 +265,7 @@ export default class Module {
 			if ( name === 'default' ) {
 				// We have an expression, e.g. `export default 42`. We have
 				// to assign that expression to a variable
-				const replacement = this.defaultExportName;
+				const replacement = this.suggestedNames.default;
 
 				statement = this.exports.default.node;
 
@@ -316,13 +344,50 @@ export default class Module {
 		return this.definitionPromises[ name ];
 	}
 
+	includeAllStatements () {
+		return this.ast.body.filter( statement => {
+			// skip already-included statements
+			if ( statement._included ) return false;
+
+			// skip import declarations
+			if ( /^Import/.test( statement.type ) ) return false;
+
+			// skip `export { foo, bar, baz }`
+			if ( statement.type === 'ExportNamedDeclaration' && statement.specifiers.length ) return false;
+
+			// include everything else
+
+
+
+			// modify exports as necessary
+			if ( /^Export/.test( statement.type ) ) {
+				// remove `export` from `export var foo = 42`
+				if ( statement.type === 'ExportNamedDeclaration' && statement.declaration.type === 'VariableDeclaration' ) {
+					statement._source.remove( statement.start, statement.declaration.start );
+				}
+
+				// remove `export` from `export class Foo {...}` or `export default Foo`
+				else if ( statement.declaration.id ) {
+					statement._source.remove( statement.start, statement.declaration.start );
+				}
+
+				// declare variables for expressions
+				else {
+					statement._source.overwrite( statement.start, statement.declaration.start, `var TODO = ` );
+				}
+			}
+
+			return true;
+		});
+	}
+
 	rename ( name, replacement ) {
 		this.canonicalNames[ name ] = replacement;
 	}
 
-	suggestDefaultName ( name ) {
-		if ( !this.defaultExportName ) {
-			this.defaultExportName = name;
+	suggestName ( exportName, suggestion ) {
+		if ( !this.suggestedNames[ exportName ] ) {
+			this.suggestedNames[ exportName ] = makeLegalIdentifier( suggestion );
 		}
 	}
 }

src/finalisers/cjs.js

@@ -26,7 +26,7 @@ export default function cjs ( bundle, magicString, exportMode ) {
 
 	let exportBlock;
 	if ( exportMode === 'default' && bundle.entryModule.exports.default ) {
-		exportBlock = `module.exports = ${bundle.defaultExportName};`;
+		exportBlock = `module.exports = ${bundle.entryModule.suggestedNames.default};`;
 	} else if ( exportMode === 'named' ) {
 		exportBlock = keys( bundle.entryModule.exports )
 			.map( key => {

src/utils/makeLegalIdentifier.js

@@ -1,6 +1,13 @@
+const reservedWords = 'break case class catch const continue debugger default delete do else export extends finally for function if import in instanceof let new return super switch this throw try typeof var void while with yield enum await implements package protected static interface private public'.split( ' ' );
+const builtins = 'Infinity NaN undefined null true false eval uneval isFinite isNaN parseFloat parseInt decodeURI decodeURIComponent encodeURI encodeURIComponent escape unescape Object Function Boolean Symbol Error EvalError InternalError RangeError ReferenceError SyntaxError TypeError URIError Number Math Date String RegExp Array Int8Array Uint8Array Uint8ClampedArray Int16Array Uint16Array Int32Array Uint32Array Float32Array Float64Array Map Set WeakMap WeakSet SIMD ArrayBuffer DataView JSON Promise Generator GeneratorFunction Reflect Proxy Intl'.split( ' ' );
+
+let blacklisted = {};
+reservedWords.concat( builtins ).forEach( word => blacklisted[ word ] = true );
+
+
 export default function makeLegalIdentifier ( str ) {
 	str = str.replace( /[^$_a-zA-Z0-9]/g, '_' );
-	if ( /\d/.test( str[0] ) ) str = `_${str}`;
+	if ( /\d/.test( str[0] ) || blacklisted[ str ] ) str = `_${str}`;
 
 	return str;
-}
+}