fix: perferred as option instaed of array

README.md

@@ -172,7 +172,7 @@ Returns the most preferred encoding from the client.
 
 Returns the most preferred encoding from a list of available encodings.
 
-##### encoding(availableEncodings, preferred)
+##### encoding(availableEncodings, { preferred })
 
 Returns the most preferred encoding from a list of available encodings, while prioritizing based on `preferred` array between same-quality encodings.
 
@@ -185,7 +185,7 @@ Returns an array of preferred encodings ordered by the client preference.
 Returns an array of preferred encodings ordered by priority from a list of
 available encodings.
 
-##### encodings(availableEncodings, preferred)
+##### encodings(availableEncodings, { preferred })
 
 Returns an array of preferred encodings ordered by priority from a list of
 available encodings, while prioritizing based on `preferred` array between same-quality encodings.

index.js

@@ -44,12 +44,12 @@ Negotiator.prototype.charsets = function charsets(available) {
   return preferredCharsets(this.request.headers['accept-charset'], available);
 };
 
-Negotiator.prototype.encoding = function encoding(available, preferred) {
-  var set = this.encodings(available, preferred);
+Negotiator.prototype.encoding = function encoding(available, opts) {
+  var set = this.encodings(available, opts);
   return set && set[0];
 };
 
-Negotiator.prototype.encodings = function encodings(available, preferred) {
+Negotiator.prototype.encodings = function encodings(available, { preferred } = {}) {
   return preferredEncodings(this.request.headers['accept-encoding'], available, preferred);
 };
 

package.json

@@ -36,6 +36,7 @@
   "scripts": {
     "lint": "eslint .",
     "test": "mocha --reporter spec --check-leaks --bail test/",
+    "test:debug": "mocha --reporter spec --check-leaks --inspect --inspect-brk test/",
     "test-ci": "nyc --reporter=lcov --reporter=text npm test",
     "test-cov": "nyc --reporter=html --reporter=text npm test"
   }

test/encoding.js

@@ -192,11 +192,11 @@ describe('negotiator.encoding(array)', function () {
     })
 
     it('should return developer-preferred encodings', function () {
-      assert.strictEqual(this.negotiator.encoding(['gzip', 'deflate'], ['deflate']), 'deflate')
-      assert.strictEqual(this.negotiator.encoding(['deflate', 'gzip'], ['deflate']), 'deflate')
-      assert.strictEqual(this.negotiator.encoding(['gzip', 'deflate'], ['gzip']), 'gzip')
-      assert.strictEqual(this.negotiator.encoding(['deflate', 'gzip'], ['gzip']), 'gzip')
-      assert.strictEqual(this.negotiator.encoding(['gzip'], ['gzip']), 'gzip')
+      assert.strictEqual(this.negotiator.encoding(['gzip', 'deflate'], { preferred: ['deflate'] }), 'deflate')
+      assert.strictEqual(this.negotiator.encoding(['deflate', 'gzip'], { preferred: ['deflate'] }), 'deflate')
+      assert.strictEqual(this.negotiator.encoding(['gzip', 'deflate'], { preferred: ['gzip'] }), 'gzip')
+      assert.strictEqual(this.negotiator.encoding(['deflate', 'gzip'], { preferred: ['gzip'] }), 'gzip')
+      assert.strictEqual(this.negotiator.encoding(['gzip'], { preferred: ['gzip'] }), 'gzip')
     })
   })
 
@@ -419,11 +419,11 @@ describe('negotiator.encodings(array)', function () {
     })
 
     it('should return developer-preferred encodings', function () {
-      assert.deepEqual(this.negotiator.encodings(['gzip', 'deflate'], ['deflate']), ['deflate', 'gzip'])
-      assert.deepEqual(this.negotiator.encodings(['deflate', 'gzip'], ['deflate']), ['deflate', 'gzip'])
-      assert.deepEqual(this.negotiator.encodings(['gzip', 'deflate'], ['gzip']), ['gzip', 'deflate'])
-      assert.deepEqual(this.negotiator.encodings(['deflate', 'gzip'], ['gzip']), ['gzip', 'deflate'])
-      assert.deepEqual(this.negotiator.encodings(['gzip'], ['gzip']), ['gzip'])
+      assert.deepEqual(this.negotiator.encodings(['gzip', 'deflate'], { preferred: ['deflate'] }), ['deflate', 'gzip'])
+      assert.deepEqual(this.negotiator.encodings(['deflate', 'gzip'], { preferred: ['deflate'] }), ['deflate', 'gzip'])
+      assert.deepEqual(this.negotiator.encodings(['gzip', 'deflate'], { preferred: ['gzip'] }), ['gzip', 'deflate'])
+      assert.deepEqual(this.negotiator.encodings(['deflate', 'gzip'], { preferred: ['gzip'] }), ['gzip', 'deflate'])
+      assert.deepEqual(this.negotiator.encodings(['gzip'], { preferred: ['gzip'] }), ['gzip'])
     })
   })