feat: add type parameter to warn function

package.json

@@ -35,7 +35,7 @@
     "@types/fs-extra": "^8.0.1",
     "@types/mocha": "^8.0.0",
     "@types/ncp": "^2.0.1",
-    "@types/node": "^14.0.0",
+    "@types/node": ">=15.6.0",
     "@types/node-fetch": "^2.5.4",
     "@types/object-hash": "^2.1.0",
     "@types/proxyquire": "^1.3.28",

src/index.ts

@@ -105,3 +105,4 @@ export {
 } from './clientInterface';
 
 export {ServiceError, ChannelCredentials} from '@grpc/grpc-js';
+export {warn} from './warnings';

src/warnings.ts

@@ -18,7 +18,8 @@ import {isBrowser} from './isbrowser';
 
 const emittedWarnings = new Set<string>();
 
-export function warn(code: string, message: string) {
+// warnType is the type of warning (e.g. 'DeprecationWarning', 'ExperimentalWarning', etc.)
+export function warn(code: string, message: string, warnType?: string) {
   // Only show a given warning once
   if (emittedWarnings.has(code)) {
     return;
@@ -27,6 +28,10 @@ export function warn(code: string, message: string) {
 
   if (isBrowser()) {
     console.warn(message);
+  } else if (typeof warnType !== 'undefined') {
+    process.emitWarning(message, {
+      type: warnType,
+    });
   } else {
     process.emitWarning(message);
   }

test/unit/warning.ts

@@ -42,4 +42,15 @@ describe('warnings', () => {
     stub.restore();
     done();
   });
+  it('should include warning type if type is provided', done => {
+    const stub = sinon.stub(process, 'emitWarning');
+    warn('codeD', 'messageD-1', 'WarningType1');
+    assert(
+      stub.calledWith('messageD-1', {
+        type: 'WarningType1',
+      })
+    );
+    stub.restore();
+    done();
+  });
 });