Add JavaScript / Deno support

README.md

@@ -32,6 +32,7 @@ published as packages to facilitate their use in other projects.
 * [.NET](dotnet/README.md)
 * [Java](java/README.md)
 * [JavaScript / Node.js](nodejs/README.md)
+* [JavaScript / Deno](deno/README.md)
 * [Python](python/README.md)
 * [Golang](golang/README.md)
 * ~~[Ruby](ruby/README.md)~~ *(Deprecated as of early 2019)*

deno/README.md

@@ -0,0 +1,34 @@
+# JavaScript GTFS-realtime Language Bindings
+
+Provides JavaScript classes generated from the
+[GTFS-realtime](https://github.com/google/transit/tree/master/gtfs-realtime) Protocol
+Buffer specification.  These classes will allow you to parse a binary Protocol
+Buffer GTFS-realtime data feed into JavaScript objects.
+
+These bindings are designed to be used in the [Deno](https://deno.land/)
+environment, but with some effort, they can probably be used in other
+JavaScript environments as well.
+
+We use the [protbuf-es.js](https://github.com/taisukef/protobuf-es.js/) library for
+JavaScript Protocol Buffer support.
+
+## Example Code
+
+The following Node.js code snippet demonstrates downloading a GTFS-realtime
+data feed from a particular URL, parsing it as a FeedMessage (the root type of
+the GTFS-realtime schema), and iterating over the results.
+
+```javascript
+import { GtfsRealtimeApi } from "https://taisukef.github.io/gtfs-realtime-bindings/deno/gtfs-realtime.js";
+
+const data = await Deno.readFile("test/vehicle_position.pb");
+const feed = GtfsRealtimeApi.transit_realtime.FeedMessage.decode(data);
+console.log(feed);
+console.log(feed.entity[0].vehicle);
+```
+
+For more details on the naming conventions for the JavaScript classes generated
+from the
+[gtfs-realtime.proto](https://github.com/google/transit/blob/master/gtfs-realtime/proto/gtfs-realtime.proto),
+check out the [ProtoBuf.js project](https://github.com/dcodeIO/ProtoBuf.js/wiki)
+which we use to handle our Protocol Buffer serialization.

deno/UPDATING.md

@@ -0,0 +1,5 @@
+# How-To Update Bindings When gtfs-realtime.proto Changes
+
+## Regenerate the language binding source from gtfs-realtime.proto.
+
+1. make nodejs/gtfs-realtime.js and edit as ES module