Detect Javascript files generated by Protocol Buffers.

lib/linguist/generated.rb

@@ -70,6 +70,7 @@ module Linguist
       compiled_cython_file? ||
       generated_go? ||
       generated_protocol_buffer? ||
+      generated_javascript_protocol_buffer? ||
       generated_apache_thrift? ||
       generated_jni_header? ||
       vcr_cassette? ||
@@ -277,6 +278,17 @@ module Linguist
       return lines[0].include?("Generated by the protocol buffer compiler.  DO NOT EDIT!")
     end
 
+    # Internal: Is the blob a Javascript source file generated by the
+    # Protocol Buffer compiler?
+    #
+    # Returns true of false.
+    def generated_javascript_protocol_buffer?
+      return false unless extname == ".js"
+      return false unless lines.count > 6
+
+      return lines[5].include?("GENERATED CODE -- DO NOT EDIT!")
+    end
+
     APACHE_THRIFT_EXTENSIONS = ['.rb', '.py', '.go', '.js', '.m', '.java', '.h', '.cc', '.cpp', '.php']
 
     # Internal: Is the blob generated by Apache Thrift compiler?
@@ -465,7 +477,7 @@ module Linguist
       return false unless extname == '.js'
       return false unless lines.count > 1
       return lines[0].start_with?("/* parser generated by jison ") ||
-              lines[0].start_with?("/* generated by jison-lex ")
+             lines[0].start_with?("/* generated by jison-lex ")
     end
   end
 end

samples/JavaScript/proto.js

@@ -0,0 +1,31 @@
+/**
+ * @fileoverview
+ * @enhanceable
+ * @public
+ */
+// GENERATED CODE -- DO NOT EDIT!
+
+goog.provide('proto.google.protobuf.Timestamp');
+
+goog.require('jspb.Message');
+
+/**
+ * Generated by JsPbCodeGenerator.
+ * @param {Array=} opt_data Optional initial data array, typically from a
+ * server response, or constructed directly in Javascript. The array is used
+ * in place and becomes part of the constructed object. It is not cloned.
+ * If no data is provided, the constructed object will be empty, but still
+ * valid.
+ * @extends {jspb.Message}
+ * @constructor
+ */
+proto.google.protobuf.Timestamp = function(opt_data) {
+  jspb.Message.initialize(this, opt_data, 0, -1, null, null);
+};
+goog.inherits(proto.google.protobuf.Timestamp, jspb.Message);
+if (goog.DEBUG && !COMPILED) {
+  proto.google.protobuf.Timestamp.displayName = 'proto.google.protobuf.Timestamp';
+}
+
+
+// Remainder elided

test/test_blob.rb

@@ -197,6 +197,7 @@ class TestBlob < Minitest::Test
     assert sample_blob_memory("Python/protocol_buffer_pb2.py").generated?
     assert sample_blob_memory("Go/api.pb.go").generated?
     assert sample_blob_memory("Go/embedded.go").generated?
+    assert sample_blob_memory("JavaScript/proto.js").generated?
 
     # Apache Thrift generated code
     assert sample_blob_memory("Python/gen-py-linguist-thrift.py").generated?