Added an interop commonjs loader.

lib/6to5/transformation/modules/common_interop.js

@@ -0,0 +1,157 @@
+module.exports = CommonJSInteropFormatter;
+
+var util = require("../../util");
+var t    = require("../../types");
+
+function CommonJSInteropFormatter(file) {
+  this.file = file;
+}
+
+CommonJSInteropFormatter.prototype.import = function (node, nodes) {
+  // import "foo";
+  nodes.push(util.template("require", {
+    //inherits: node,
+
+    MODULE_NAME: node.source.raw
+  }, true));
+};
+
+CommonJSInteropFormatter.prototype.importSpecifier = function (specifier, node, nodes) {
+  var variableName = t.getSpecifierName(specifier);
+//console.log("HI")
+  // import foo from "foo";
+   if (specifier.default) {
+    // var m_foo = require("foo"), foo = m_foo && (m_foo["default"] || m_foo);
+    var tmpId = util.getUid(t.identifier(variableName), this.file);
+    nodes.push(
+      t.variableDeclaration('var', [
+        t.variableDeclarator(tmpId, 
+          t.callExpression(t.identifier("require"), [node.source])
+        ),
+        t.variableDeclarator(variableName,
+           t.binaryExpression(
+            "&&",
+            tmpId,
+            t.binaryExpression(
+              "||",
+              t.memberExpression(
+                tmpId,
+                t.identifier("default"),
+                true
+              ),
+              tmpId
+            )
+          )
+        )
+      ])
+    );
+    return;
+  }
+
+  var templateName = "require-assign";
+
+  // import * as bar from "foo";
+  if (specifier.type !== "ImportBatchSpecifier") templateName += "-key";
+
+  nodes.push(util.template(templateName, {
+    //inherits: node.specifiers.length === 1 && node,
+
+    VARIABLE_NAME: variableName,
+    MODULE_NAME:   node.source.raw,
+    KEY:           specifier.id
+  }));
+};
+
+CommonJSInteropFormatter.prototype.export = function (node, nodes) {
+  var declar = node.declaration;
+
+  if (node.default) {
+    var ref = declar;
+
+    if (t.isClass(ref) || t.isFunction(ref)) {
+      if (ref.id) {
+        nodes.push(t.toStatement(ref));
+        ref = ref.id;
+      }
+    }
+
+    nodes.push(util.template("exports-default", {
+      //inherits: node,
+
+      VALUE: ref
+    }, true));
+  } else {
+    var assign;
+
+    if (t.isVariableDeclaration(declar)) {
+      var decl = declar.declarations[0];
+
+      if (decl.init) {
+        decl.init = util.template("exports-assign", {
+          //inherits: node,
+
+          VALUE: decl.init,
+          KEY:   decl.id
+        });
+      }
+
+      nodes.push(declar);
+    } else {
+      assign = util.template("exports-assign", {
+        //inherits: node,
+
+        VALUE: declar.id,
+        KEY:   declar.id
+      }, true);
+
+      nodes.push(t.toStatement(declar));
+      nodes.push(assign);
+
+      if (t.isFunctionDeclaration(declar)) {
+        assign._blockHoist = true;
+      }
+    }
+  }
+};
+
+CommonJSInteropFormatter.prototype._exportSpecifier = function (getRef, specifier, node, nodes) {
+  var variableName = t.getSpecifierName(specifier);
+
+  var inherits = false;
+  if (node.specifiers.length === 1) inherits = node;
+
+  if (node.source) {
+    if (t.isExportBatchSpecifier(specifier)) {
+      // export * from "foo";
+      nodes.push(util.template("exports-wildcard", {
+        //inherits: inherits,
+
+        OBJECT: getRef()
+      }, true));
+    } else {
+      // export { foo } from "test";
+      nodes.push(util.template("exports-assign-key", {
+        //inherits: inherits,
+
+        VARIABLE_NAME: variableName.name,
+        OBJECT:        getRef(),
+        KEY:           specifier.id
+      }, true));
+    }
+  } else {
+    // export { foo };
+    nodes.push(util.template("exports-assign", {
+      //inherits: inherits,
+
+      VALUE: specifier.id,
+      KEY:   variableName
+    }, true));
+  }
+};
+
+CommonJSInteropFormatter.prototype.exportSpecifier = function (specifier, node, nodes) {
+  return this._exportSpecifier(function () {
+    return t.callExpression(t.identifier("require"), [node.source]);
+  }, specifier, node, nodes);
+};
+

lib/6to5/transformation/transform.js

@@ -20,10 +20,11 @@ transform._ensureTransformerNames = function (type, keys) {
 transform.transformers = {};
 
 transform.moduleFormatters = {
-  common: require("./modules/common"),
-  ignore: require("./modules/ignore"),
-  amd:    require("./modules/amd"),
-  umd:    require("./modules/umd")
+  common:        require("./modules/common"),
+  commoninterop: require("./modules/common_interop"),
+  ignore:        require("./modules/ignore"),
+  amd:           require("./modules/amd"),
+  umd:           require("./modules/umd")
 };
 
 _.each({