Merge pull request #5 from jstrimpel/master

make local file extension optional

index.js

@@ -85,7 +85,7 @@ function MomentLocalesPlugin(options) {
 
     if (localesToKeep.length > 0) {
         var regExpPatterns = localesToKeep.map(function(localeName) {
-            return localeName + '\\.js';
+            return localeName + '(\\.js)?';
         });
 
         return new ContextReplacementPlugin(

index.test.js

@@ -0,0 +1,54 @@
+const MomentLocalesPlugin = require('./index.js');
+
+test('returns a ContextReplacementPlugin instance when locales are passed', () => {
+    const result = new MomentLocalesPlugin({
+        localesToKeep: ['en-gb', 'ru'],
+    });
+
+    expect(result.constructor.name).toEqual('ContextReplacementPlugin');
+    expect(result.newContentRegExp.toString()).toEqual(
+        '/(en-gb(\\.js)?|ru(\\.js)?)$/'
+    );
+});
+
+test('returns an IgnorePlugin instance when locales are not passed', () => {
+    const result = new MomentLocalesPlugin({
+        localesToKeep: [],
+    });
+
+    expect(result.constructor.name).toEqual('IgnorePlugin');
+});
+
+test('works when no options are passed', () => {
+    const result = new MomentLocalesPlugin();
+
+    expect(result.constructor.name).toEqual('IgnorePlugin');
+});
+
+test('normalizes locales to match file names', () => {
+    const result = new MomentLocalesPlugin({
+        localesToKeep: ['en-gb-foo'],
+    });
+
+    expect(result.newContentRegExp.toString()).toMatch(/en-gb(\\.js)?/);
+});
+
+describe('validation', () => {
+    test('throws when an unknown option is passed', () => {
+        expect(() => new MomentLocalesPlugin({ foo: 'bar' })).toThrow(
+            /unknown option/
+        );
+    });
+
+    test('throws when not an array is passed into `localesToKeep`', () => {
+        expect(() => new MomentLocalesPlugin({ localesToKeep: {} })).toThrow(
+            /Expected .+ option to be an array, received/
+        );
+    });
+
+    test('throws when an invalid locale is passed into `localesToKeep`', () => {
+        expect(
+            () => new MomentLocalesPlugin({ localesToKeep: ['foo-bar'] })
+        ).toThrow(/Moment.js doesn’t include/);
+    });
+});