fix: better client close(), update .nycrc, require mocha explicitly

.nycrc

@@ -12,6 +12,7 @@
     "**/scripts",
     "**/protos",
     "**/test",
+    "**/*.d.ts",
     ".jsdoc.js",
     "**/.jsdoc.js",
     "karma.conf.js",

protos/protos.d.ts

@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

protos/protos.js

@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

src/v1/speech_client.ts

@@ -208,6 +208,9 @@ export class SpeechClient {
     for (const methodName of speechStubMethods) {
       const innerCallPromise = this.speechStub.then(
         stub => (...args: Array<{}>) => {
+          if (this._terminated) {
+            return Promise.reject('The client has already been closed.');
+          }
           return stub[methodName].apply(stub, args);
         },
         (err: Error | null | undefined) => () => {
@@ -228,9 +231,6 @@ export class SpeechClient {
         callOptions?: CallOptions,
         callback?: APICallback
       ) => {
-        if (this._terminated) {
-          return Promise.reject('The client has already been closed.');
-        }
         return apiCall(argument, callOptions, callback);
       };
     }

src/v1p1beta1/speech_client.ts

@@ -208,6 +208,9 @@ export class SpeechClient {
     for (const methodName of speechStubMethods) {
       const innerCallPromise = this.speechStub.then(
         stub => (...args: Array<{}>) => {
+          if (this._terminated) {
+            return Promise.reject('The client has already been closed.');
+          }
           return stub[methodName].apply(stub, args);
         },
         (err: Error | null | undefined) => () => {
@@ -228,9 +231,6 @@ export class SpeechClient {
         callOptions?: CallOptions,
         callback?: APICallback
       ) => {
-        if (this._terminated) {
-          return Promise.reject('The client has already been closed.');
-        }
         return apiCall(argument, callOptions, callback);
       };
     }