remove integer error for node, add debug option (#18)

experimental/babel-preset-env/README.md

@@ -20,9 +20,12 @@ The data for this is currently at: [/data/plugins.json](/data/plugins.json) and
 
 Currently: "chrome, edge, firefox, safari, node"
 
-* `loose` - Enable "loose" transformations for any plugins in this preset that allow them (Disabled by default).
+> Some node features are > `6.5`
+
+* `loose` (boolean) - Enable "loose" transformations for any plugins in this preset that allow them (Disabled by default).
 * `modules` - Enable transformation of ES6 module syntax to another module type (Enabled by default to `"commonjs"`).
   * Can be `false` to not transform modules, or one of `["amd", "umd", "systemjs", "commonjs"]`
+* `debug` (boolean) - `console.log` out the targets and plugins being used as well as the version specified in `/data/plugins.json`
 
 ```js
 {
@@ -95,3 +98,18 @@ exports.A = A;
 
 export class A {}
 ```
+
+### Example with `debug: true`
+
+```js
+Using targets: {
+  "node": 6.5
+}
+
+Using plugins:
+
+module: false
+transform-exponentiation-operator {}
+transform-async-to-generator {}
+syntax-trailing-function-commas {}
+```

experimental/babel-preset-env/src/index.js

@@ -51,10 +51,6 @@ export const isPluginRequired = (supportedEnvironments, plugin) => {
       const lowestImplementedVersion = plugin[environment];
       const lowestTargetedVersion = supportedEnvironments[environment];
 
-      if (environment === "node" && lowestTargetedVersion % 1 === 0) {
-        throw new Error("Please use a minor version when specifying `node`: 6.5, 6.7");
-      }
-
       if (lowestTargetedVersion < lowestImplementedVersion) {
         return true;
       }
@@ -93,12 +89,32 @@ export default function buildPreset(context, opts) {
   const loose = validateLooseOption(opts.loose);
   const moduleType = validateModulesOption(opts.modules);
   const targets = getTargets(opts.targets);
+  const debug = opts.debug;
 
-  const transformations = Object.keys(pluginList)
-    .filter(pluginName => isPluginRequired(targets, pluginList[pluginName]))
-    .map(pluginName => {
-      return [require(`babel-plugin-${pluginName}`), { loose }];
+  let transformations = Object.keys(pluginList)
+    .filter(pluginName => isPluginRequired(targets, pluginList[pluginName]));
+
+  if (debug) {
+    console.log("");
+    console.log(`Using targets: ${JSON.stringify(targets, null, 2)}`);
+    console.log("");
+    console.log("Using plugins:");
+    console.log("");
+    console.log(`module: ${moduleType}`);
+    transformations.forEach(transform => {
+      let envList = pluginList[transform];
+      let filteredList = Object.keys(targets)
+      .reduce((a, b) => {
+        a[b] = envList[b];
+        return a;
+      }, {});
+      console.log(transform, JSON.stringify(filteredList, null, 2));
     });
+  }
+
+  transformations = transformations.map(pluginName => {
+    return [require(`babel-plugin-${pluginName}`), { loose }];
+  });
 
   const modules = [
     moduleType === "commonjs" && [require("babel-plugin-transform-es2015-modules-commonjs"), { loose }],
@@ -112,5 +128,5 @@ export default function buildPreset(context, opts) {
       ...modules,
       ...transformations
     ]
-  }
+  };
 }

experimental/babel-preset-env/test/index.js

@@ -79,21 +79,6 @@ describe("babel-preset-env", () => {
         babelPresetEnv.isPluginRequired(targets, plugin);
       }, Error);
     });
-
-    it("throws when specifiying an integer for node", () => {
-      let targets;
-      const plugin = {
-        node: 6
-      };
-
-      targets = {
-        "node": 6
-      };
-
-      assert.throws(() => {
-        babelPresetEnv.isPluginRequired(targets, plugin);
-      }, Error);
-    });
   });
 
   describe("validateLooseOption", () => {