feat(api): freeze API object

javiercejudo · Feb 1, 2016 · 31ad634 · 31ad634
1 parent b78e3ab
commit 31ad634
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Showing 2 changed files with 18 additions and 8 deletions.
diff --git a/src/normalise.js b/src/normalise.js
@@ -6,14 +6,13 @@ var toDecimalFactory = require('to-decimal-arbitrary-precision');
 
 module.exports = function factory(Decimal) {
   var toDecimal = toDecimalFactory(Decimal);
-  var api = {};
 
-  api.normalise = function normalise(scale, x) {
-    var scale0 = toDecimal(scale[0]);
+  return Object.freeze({
+    normalise: function normalise(scale, x) {
+      var scale0 = toDecimal(scale[0]);
 
-    return toDecimal(x).minus(scale0)
-      .div(toDecimal(scale[1]).minus(scale0));
-  };
-
-  return api;
+      return toDecimal(x).minus(scale0)
+        .div(toDecimal(scale[1]).minus(scale0));
+    }
+  });
 };
diff --git a/test/spec.js b/test/spec.js
@@ -10,6 +10,17 @@ var floatingAdapter = require('floating-adapter');
 var normaliseFactory = require('../src/normalise');
 
 describe('normalising', function() {
+  describe('api', function() {
+    it('should be frozen', function() {
+      var Decimal = arbitraryPrecision(floatingAdapter);
+      var normalise = normaliseFactory(Decimal);
+
+      (function() {
+        normalise.normalise = function() {};
+      }).should.throw();
+    });
+  });
+
   describe('with valid scales', function() {
     describe('should support', function() {
       var Decimal = arbitraryPrecision(floatingAdapter);