fix(express): fixes typing for express middleware.

Author: jcchavezs

packages/zipkin-instrumentation-express/index.d.ts

@@ -11,6 +11,10 @@ import {Tracer} from 'zipkin';
  * Note that if the next middleware makes async calls, it should either
  * store the span id manually or use a CLSContext so that the annotations
  * go to the correct spans
+ *
+ * @param {Object} options
+ * @property {Tracer} options.tracer
+ * @property {number} options.port
  */
 export declare function expressMiddleware(
   options: {tracer: Tracer, port?: number}

packages/zipkin-instrumentation-express/src/expressMiddleware.js

@@ -19,7 +19,7 @@ function formatRequestUrl(req) {
 /**
  * @typedef {Object} MiddlewareOptions
  * @property {Object} tracer
- * @property {string} serviceName
+ * @property {string} serviceName @deprecated use the localEndpoint in Tracer instead
  * @property {number} port
  */