Split export extensions into 2 different plugins, update stage presets (#6080)

packages/babel-plugin-transform-export-default/.npmignore

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+src
+test
+*.log

packages/babel-plugin-transform-export-default/README.md

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+# babel-plugin-transform-export-default
+
+> Compile export-default-from statements to ES2015
+
+## Example
+
+```js
+export v from 'mod';
+```
+
+## Installation
+
+```sh
+npm install --save-dev babel-plugin-transform-export-default
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["transform-export-default"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins transform-export-default script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["transform-export-default"]
+});
+```
+## References
+
+* ~~[Proposal: Additional export-from statements in ES7](https://github.com/leebyron/ecmascript-more-export-from)~~ (Withdrawn)
+* [ECMAScript Proposal: export default from](https://github.com/leebyron/ecmascript-export-default-from)

packages/babel-plugin-transform-export-default/package.json

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+{
+  "name": "babel-plugin-transform-export-default",
+  "version": "7.0.0-alpha.19",
+  "description": "Compile export default to ES2015",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-export-default",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "babel-plugin-syntax-export-extensions": "7.0.0-alpha.19"
+  },
+  "devDependencies": {
+    "babel-helper-plugin-test-runner": "7.0.0-alpha.19"
+  }
+}

packages/babel-plugin-transform-export-default/src/index.js

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+import syntaxExportExtensions from "babel-plugin-syntax-export-extensions";
+
+export default function({ types: t }) {
+  function build(node, nodes, scope) {
+    const hasNoExportDefault = node.specifiers.every(
+      specifier => !t.isExportDefaultSpecifier(specifier),
+    );
+    if (hasNoExportDefault) return;
+
+    const specifier = node.specifiers.shift();
+    const uid = scope.generateUidIdentifier(specifier.exported.name);
+
+    let newSpecifier;
+    if (t.isExportNamespaceSpecifier(specifier)) {
+      newSpecifier = t.importNamespaceSpecifier(uid);
+    } else {
+      newSpecifier = t.importDefaultSpecifier(uid);
+    }
+    nodes.push(t.importDeclaration([newSpecifier], node.source));
+    nodes.push(
+      t.exportNamedDeclaration(null, [
+        t.exportSpecifier(uid, specifier.exported),
+      ]),
+    );
+
+    build(node, nodes, scope);
+  }
+
+  return {
+    inherits: syntaxExportExtensions,
+
+    visitor: {
+      ExportNamedDeclaration(path) {
+        const { node, scope } = path;
+        const nodes = [];
+        build(node, nodes, scope);
+        if (!nodes.length) return;
+
+        if (node.specifiers.length >= 1) {
+          nodes.push(node);
+        }
+        path.replaceWithMultiple(nodes);
+      },
+    },
+  };
+}

packages/babel-plugin-transform-export-default/test/fixtures/export-default/default-compound-es6/actual.js

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+export v, { x, y as w } from "mod";

packages/babel-plugin-transform-export-default/test/fixtures/export-default/default-compound-es6/expected.js

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+import _v from "mod";
+export { _v as v };
+export { x, y as w } from "mod";

packages/babel-plugin-transform-export-default/test/fixtures/export-default/default-es6/actual.js

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+export foo from "bar";

packages/babel-plugin-transform-export-default/test/fixtures/export-default/default-es6/expected.js

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+import _foo from "bar";
+export { _foo as foo };

packages/babel-plugin-transform-export-default/test/fixtures/export-default/options.json

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+{
+  "plugins": ["external-helpers", "transform-export-default"]
+}

packages/babel-plugin-transform-export-default/test/index.js

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+import runner from "babel-helper-plugin-test-runner";
+
+runner(__dirname);