chore(examples): lint examples/dns using shared top-level eslint config (#2898)

Refs: #2891

Author: trentm

examples/dns/.eslintrc.js

@@ -0,0 +1,26 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+'use strict';
+
+const baseConfig = require('../../eslint.config');
+
+module.exports = {
+  ...baseConfig,
+  env: {
+    node: true,
+  },
+};

examples/dns/.npmrc

@@ -0,0 +1 @@
+package-lock=false

examples/dns/client.js

@@ -1,3 +1,19 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 'use strict';
 
 const api = require('@opentelemetry/api');
@@ -28,8 +44,12 @@ function makeLookup() {
   // The process must live for at least the interval past any traces that
   // must be exported, or some risk being lost if they are recorded after the
   // last export.
-  console.log('Sleeping 5 seconds before shutdown to ensure all records are flushed.');
-  setTimeout(() => { console.log('Completed.'); }, 5000);
+  console.log(
+    'Sleeping 5 seconds before shutdown to ensure all records are flushed.'
+  );
+  setTimeout(() => {
+    console.log('Completed.');
+  }, 5000);
 }
 
 makeLookup();

examples/dns/package.json

@@ -5,6 +5,8 @@
   "description": "Example of DNS integration with OpenTelemetry",
   "main": "index.js",
   "scripts": {
+    "lint": "eslint . --ext=ts,js,mjs",
+    "lint:fix": "eslint . --ext=ts,js,mjs --fix",
     "zipkin:client": "cross-env EXPORTER=zipkin node ./client.js",
     "jaeger:client": "cross-env EXPORTER=jaeger node ./client.js"
   },

examples/dns/tracer.js

@@ -1,3 +1,19 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 'use strict';
 
 const opentelemetry = require('@opentelemetry/api');
@@ -10,7 +26,7 @@ const { registerInstrumentations } = require('@opentelemetry/instrumentation');
 
 const EXPORTER = process.env.EXPORTER || '';
 
-module.exports = (serviceName) => {
+module.exports = serviceName => {
   let exporter;
   if (EXPORTER.toLowerCase().startsWith('z')) {
     exporter = new ZipkinExporter({
@@ -23,9 +39,7 @@ module.exports = (serviceName) => {
   }
 
   const provider = new NodeTracerProvider({
-    spanProcessors: [
-      new SimpleSpanProcessor(exporter),
-    ],
+    spanProcessors: [new SimpleSpanProcessor(exporter)],
   });
 
   // Initialize the OpenTelemetry APIs to use the NodeTracerProvider bindings