Fix warnings about new Buffer()

Author: lahmatiy

.travis.yml

@@ -6,5 +6,6 @@ script: "npm run travis"
 node_js:
   - "0.10"
   - "0.12"
-  - "4"
+  - "8"
+  - "10"
   - "node"

index.js

@@ -8,6 +8,12 @@ function unixPathname(pathname) {
     return pathname.replace(/\\/g, '/');
 }
 
+function bufferFrom(data, encoding) {
+    return typeof Buffer.from === 'function'
+        ? Buffer.from(data, encoding)
+        : new Buffer(data, encoding);
+}
+
 function readFromStream(stream, minify) {
     var buffer = [];
 
@@ -141,7 +147,7 @@ function resolveSourceMap(source, inputMap, outputMap, inputFile, outputFile) {
 
                     if (inputMapComment.substr(0, 5) === 'data:') {
                         // decode source map content from comment
-                        inputMapContent = new Buffer(inputMapComment.substr(inputMapComment.indexOf('base64,') + 7), 'base64').toString();
+                        inputMapContent = bufferFrom(inputMapComment.substr(inputMapComment.indexOf('base64,') + 7), 'base64').toString();
                     } else {
                         // value is filename – resolve it as absolute path
                         if (inputFile) {
@@ -321,7 +327,7 @@ function minifyStream(options) {
                 // inline source map
                 sourceMapAnnotation = '\n' +
                     '/*# sourceMappingURL=data:application/json;base64,' +
-                    new Buffer(result.map.toString()).toString('base64') +
+                    bufferFrom(result.map.toString()).toString('base64') +
                     ' */';
             }
 

test/basic.js

@@ -13,6 +13,12 @@ function fixtureContent(filepath) {
     return fs.readFileSync(fixturePath(filepath), 'utf-8').trim();
 }
 
+function bufferFrom(data, encoding) {
+    return typeof Buffer.from === 'function'
+        ? Buffer.from(data, encoding)
+        : new Buffer(data, encoding);
+}
+
 function run() {
     var args = [path.join(__dirname, '../bin/csso')].concat(Array.prototype.slice.call(arguments));
     var proc = child.spawn(cmd, args, { stdio: 'pipe' });
@@ -59,9 +65,8 @@ function run() {
 }
 
 it('should output version', function() {
-    return run('-v').output(
-        require('csso/package.json').version
-    );
+    return run('-v')
+        .output(require('csso/package.json').version);
 });
 
 it('should read content from stdin if no file specified', function() {
@@ -79,7 +84,7 @@ it('--source-map inline', function() {
     return run(fixturePath('1.css'), '--source-map', 'inline')
         .output(function(res) {
             var expected = fixtureContent('1.min.css.map');
-            var actual = new Buffer(String(res).match(/data:application\/json;base64,(.+)/)[1], 'base64').toString('utf-8');
+            var actual = bufferFrom(String(res).match(/data:application\/json;base64,(.+)/)[1], 'base64').toString('utf-8');
 
             assert.equal(actual, expected);
         });