opencensus-nodejs: Enforce strictNullChecks (#426)

Author: mayurkale22

packages/opencensus-nodejs/src/trace/tracing.ts

@@ -27,7 +27,7 @@ export class Tracing implements core.Tracing {
   /** A tracer object */
   readonly tracer: core.Tracer;
   /** A plugin loader object */
-  private pluginLoader: PluginLoader;
+  private pluginLoader?: PluginLoader;
   /** Plugin names */
   private defaultPlugins: core.PluginNames;
   /** A configuration object to start the tracing */
@@ -92,12 +92,13 @@ export class Tracing implements core.Tracing {
   stop() {
     this.activeLocal = false;
     this.tracer.stop();
-    this.pluginLoader.unloadPlugins();
+    if (this.pluginLoader) {
+      this.pluginLoader.unloadPlugins();
+    }
     this.configLocal = {};
     this.logger = logger.logger();
   }
 
-
   /** Gets the exporter. */
   get exporter(): core.Exporter {
     return this.configLocal.exporter ?
@@ -120,7 +121,6 @@ export class Tracing implements core.Tracing {
     return this;
   }
 
-
   /**
    * Unregisters an exporter.
    * @param exporter The exporter to stop sending traces to.

packages/opencensus-nodejs/test/test-tracing.ts

@@ -13,18 +13,13 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
-
 import * as core from '@opencensus/core';
 import {logger} from '@opencensus/core';
 import * as assert from 'assert';
-
 import {defaultConfig} from '../src/trace/config/default-config';
 import {Constants} from '../src/trace/constants';
 import {Tracing} from '../src/trace/tracing';
 
-
-
 const NOOP_EXPORTER = new core.NoopExporter();
 describe('Tracing', () => {
   Constants.DEFAULT_INSTRUMENTATION_MODULES = ['http', 'https'];
@@ -278,18 +273,6 @@ describe('Tracing', () => {
       assert.strictEqual(tracing.config.exporter, newExporter);
       assert.strictEqual(tracing.tracer.eventListeners.length, 1);
     });
-
-    it('should register a null to unRegister', () => {
-      const tracing = new Tracing();
-      tracing.start();
-      const exporter = NOOP_EXPORTER;
-      tracing.registerExporter(exporter);
-      assert.strictEqual(tracing.config.exporter, exporter);
-      assert.strictEqual(tracing.tracer.eventListeners.length, 1);
-      tracing.registerExporter(null);
-      assert.ok(tracing.config.exporter instanceof core.NoopExporter);
-      assert.strictEqual(tracing.tracer.eventListeners.length, 0);
-    });
   });
 
   /** Should unregister the exporter instance */

packages/opencensus-nodejs/tsconfig.json

@@ -6,7 +6,7 @@
     "pretty": true,
     "module": "commonjs",
     "target": "es6",
-    "strictNullChecks": false,
+    "strictNullChecks": true,
     "noUnusedLocals": true,
     "sourceMap": false
   },