Detect ts-proto generated files. (#7082)

ts-proto [added generated code comments in May](stephenh/ts-proto#1037). This updates linguist to properly detect them.

lib/linguist/generated.rb

@@ -91,6 +91,7 @@ def generated?
       generated_protocol_buffer_from_go? ||
       generated_protocol_buffer? ||
       generated_javascript_protocol_buffer? ||
+      generated_typescript_protocol_buffer? ||
       generated_apache_thrift? ||
       generated_jni_header? ||
       vcr_cassette? ||
@@ -367,6 +368,28 @@ def generated_javascript_protocol_buffer?
       return lines[5].include?("GENERATED CODE -- DO NOT EDIT!")
     end
 
+    # Internal: Is the blob a TypeScript source file generated by the
+    # Protocol Buffer compiler?
+    #
+    # Files generated by ts-proto typically start with something like this
+    # (though the versions lines are optional):
+    #
+    #     // Code generated by protoc-gen-ts_proto. DO NOT EDIT.
+    #     // versions:
+    #     //   protoc-gen-ts_proto  v1.181.2
+    #     //   protoc               v5.28.2
+    #     // source: hello.proto
+    #
+    #     /* eslint-disable */
+    #
+    # Returns true or false.
+    def generated_typescript_protocol_buffer?
+      return false unless extname == ".ts"
+      return false unless lines.count > 4
+
+      return lines[0].include?("Code generated by protoc-gen-ts_proto. 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?

test/test_blob.rb

@@ -202,6 +202,7 @@ def test_generated
     assert sample_blob_memory("Go/embedded.go").generated?
     assert sample_blob_memory("Go/oapi-codegen.go").generated?
     assert sample_blob_memory("JavaScript/proto.js").generated?
+    assert sample_blob_memory("TypeScript/proto.ts").generated?
     assert sample_blob_memory("PHP/ProtobufGenerated.php").generated?
 
     # Apache Thrift generated code