refactor(examples/express): small refactor of imports (open-telemetry#2562)

Author: trentm

examples/express/src/tracer.ts

@@ -1,22 +1,14 @@
 'use strict';
 
-import { SpanKind, Attributes } from "@opentelemetry/api";
-
-import opentelemetry = require('@opentelemetry/api');
-
-// Not functionally required but gives some insight what happens behind the scenes
-const { diag, DiagConsoleLogger, DiagLogLevel } = opentelemetry;
-diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.INFO);
-
+import { trace, SamplingDecision, SpanKind, Attributes } from '@opentelemetry/api';
 import { registerInstrumentations } from '@opentelemetry/instrumentation';
 import { NodeTracerProvider } from '@opentelemetry/sdk-trace-node';
 import { Sampler, AlwaysOnSampler, SimpleSpanProcessor } from '@opentelemetry/sdk-trace-base';
 import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-proto';
 import { Resource } from '@opentelemetry/resources';
 import { ATTR_SERVICE_NAME, ATTR_HTTP_ROUTE } from '@opentelemetry/semantic-conventions';
-
 import { ExpressInstrumentation } from '@opentelemetry/instrumentation-express';
-import {HttpInstrumentation} from '@opentelemetry/instrumentation-http';
+import { HttpInstrumentation } from '@opentelemetry/instrumentation-http';
 
 export const setupTracing = (serviceName: string) => {
   const provider = new NodeTracerProvider({
@@ -41,7 +33,7 @@ export const setupTracing = (serviceName: string) => {
   // Initialize the OpenTelemetry APIs to use the NodeTracerProvider bindings
   provider.register();
 
-  return opentelemetry.trace.getTracer(serviceName);
+  return trace.getTracer(serviceName);
 };
 
 type FilterFunction = (spanName: string, spanKind: SpanKind, attributes: Attributes) => boolean;
@@ -50,7 +42,7 @@ function filterSampler(filterFn: FilterFunction, parent: Sampler): Sampler {
   return {
     shouldSample(ctx, tid, spanName, spanKind, attr, links) {
       if (!filterFn(spanName, spanKind, attr)) {
-        return { decision: opentelemetry.SamplingDecision.NOT_RECORD };
+        return { decision: SamplingDecision.NOT_RECORD };
       }
       return parent.shouldSample(ctx, tid, spanName, spanKind, attr, links);
     },
@@ -61,5 +53,5 @@ function filterSampler(filterFn: FilterFunction, parent: Sampler): Sampler {
 }
 
 function ignoreHealthCheck(spanName: string, spanKind: SpanKind, attributes: Attributes) {
-  return spanKind !== opentelemetry.SpanKind.SERVER || attributes[ATTR_HTTP_ROUTE] !== "/health";
+  return spanKind !== SpanKind.SERVER || attributes[ATTR_HTTP_ROUTE] !== "/health";
 }