chore: do not export singletons

src/api/context.ts

@@ -23,7 +23,6 @@ import {
 } from '../internal/global-utils';
 
 const API_NAME = 'context';
-const NOOP_CONTEXT_MANAGER = new NoopContextManager();
 
 /**
  * Singleton object which represents the entry point to the OpenTelemetry Context API
@@ -87,7 +86,7 @@ export class ContextAPI {
   }
 
   private _getContextManager(): ContextManager {
-    return getGlobal(API_NAME) || NOOP_CONTEXT_MANAGER;
+    return getGlobal(API_NAME) || new NoopContextManager();
   }
 
   /** Disable and remove the global context manager */

src/api/propagation.ts

@@ -15,19 +15,19 @@
  */
 
 import { Context } from '../context/types';
-import { NOOP_TEXT_MAP_PROPAGATOR } from '../propagation/NoopTextMapPropagator';
+import {
+  getGlobal,
+  registerGlobal,
+  unregisterGlobal,
+} from '../internal/global-utils';
+import { NoopTextMapPropagator } from '../propagation/NoopTextMapPropagator';
 import {
   defaultTextMapGetter,
   defaultTextMapSetter,
   TextMapGetter,
   TextMapPropagator,
   TextMapSetter,
 } from '../propagation/TextMapPropagator';
-import {
-  getGlobal,
-  registerGlobal,
-  unregisterGlobal,
-} from '../internal/global-utils';
 
 const API_NAME = 'propagation';
 
@@ -101,6 +101,6 @@ export class PropagationAPI {
   }
 
   private _getGlobalPropagator(): TextMapPropagator {
-    return getGlobal(API_NAME) || NOOP_TEXT_MAP_PROPAGATOR;
+    return getGlobal(API_NAME) || new NoopTextMapPropagator();
   }
 }

src/propagation/NoopTextMapPropagator.ts

@@ -31,5 +31,3 @@ export class NoopTextMapPropagator implements TextMapPropagator {
     return [];
   }
 }
-
-export const NOOP_TEXT_MAP_PROPAGATOR = new NoopTextMapPropagator();

src/trace/NoopTracer.ts

@@ -55,5 +55,3 @@ function isSpanContext(spanContext: any): spanContext is SpanContext {
     typeof spanContext['traceFlags'] === 'number'
   );
 }
-
-export const NOOP_TRACER = new NoopTracer();

src/trace/NoopTracerProvider.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { NOOP_TRACER } from './NoopTracer';
+import { NoopTracer } from './NoopTracer';
 import { Tracer } from './tracer';
 import { TracerProvider } from './tracer_provider';
 
@@ -26,8 +26,6 @@ import { TracerProvider } from './tracer_provider';
  */
 export class NoopTracerProvider implements TracerProvider {
   getTracer(_name?: string, _version?: string): Tracer {
-    return NOOP_TRACER;
+    return new NoopTracer();
   }
 }
-
-export const NOOP_TRACER_PROVIDER = new NoopTracerProvider();

src/trace/ProxyTracer.ts

@@ -15,7 +15,7 @@
  */
 
 import { Context } from '../context/types';
-import { NOOP_TRACER } from './NoopTracer';
+import { NoopTracer } from './NoopTracer';
 import { ProxyTracerProvider } from './ProxyTracerProvider';
 import { Span } from './span';
 import { SpanOptions } from './SpanOptions';
@@ -50,7 +50,7 @@ export class ProxyTracer implements Tracer {
     const tracer = this._provider.getDelegateTracer(this.name, this.version);
 
     if (!tracer) {
-      return NOOP_TRACER;
+      return new NoopTracer();
     }
 
     this._delegate = tracer;

src/trace/ProxyTracerProvider.ts

@@ -17,7 +17,7 @@
 import { Tracer } from './tracer';
 import { TracerProvider } from './tracer_provider';
 import { ProxyTracer } from './ProxyTracer';
-import { NOOP_TRACER_PROVIDER } from './NoopTracerProvider';
+import { NoopTracerProvider } from './NoopTracerProvider';
 
 /**
  * Tracer provider which provides {@link ProxyTracer}s.
@@ -41,7 +41,7 @@ export class ProxyTracerProvider implements TracerProvider {
   }
 
   getDelegate(): TracerProvider {
-    return this._delegate ?? NOOP_TRACER_PROVIDER;
+    return this._delegate ?? new NoopTracerProvider();
   }
 
   /**

test/internal/global.test.ts

@@ -67,28 +67,31 @@ describe('Global Utils', () => {
   });
 
   it('should disable both if one is disabled', () => {
-    const original = api1.context['_getContextManager']();
-
-    api1.context.setGlobalContextManager(new NoopContextManager());
+    const manager = new NoopContextManager();
+    api1.context.setGlobalContextManager(manager);
 
-    assert.notStrictEqual(original, api1.context['_getContextManager']());
+    assert.strictEqual(manager, api1.context['_getContextManager']());
     api2.context.disable();
-    assert.strictEqual(original, api1.context['_getContextManager']());
+    assert.notStrictEqual(manager, api1.context['_getContextManager']());
   });
 
   it('should return the module NoOp implementation if the version is a mismatch', () => {
-    const original = api1.context['_getContextManager']();
     const newContextManager = new NoopContextManager();
     api1.context.setGlobalContextManager(newContextManager);
 
+    // ensure new context manager is returned
     assert.strictEqual(api1.context['_getContextManager'](), newContextManager);
 
     const globalInstance = getGlobal('context');
     assert.ok(globalInstance);
     // @ts-expect-error we are modifying internals for testing purposes here
     _globalThis[Symbol.for(GLOBAL_API_SYMBOL_KEY)].version = '0.0.1';
 
-    assert.strictEqual(api1.context['_getContextManager'](), original);
+    // ensure new context manager is not returned because version above is incompatible
+    assert.notStrictEqual(
+      api1.context['_getContextManager'](),
+      newContextManager
+    );
   });
 
   it('should log an error if there is a duplicate registration', () => {