chore!: drop support for custom promises

src/iam.ts

@@ -93,16 +93,11 @@ export type TestIamPermissionsCallback = ResourceCallback<
  * // subscription.iam
  */
 export class IAM {
-  // tslint:disable-next-line variable-name
-  Promise?: PromiseConstructor;
   pubsub: PubSub;
   request: typeof PubSub.prototype.request;
   id: string;
 
   constructor(pubsub: PubSub, id: string) {
-    if (pubsub.Promise) {
-      this.Promise = pubsub.Promise;
-    }
     this.pubsub = pubsub;
     this.request = pubsub.request.bind(pubsub);
     this.id = id;

src/publisher/index.ts

@@ -56,17 +56,11 @@ export const BATCH_LIMITS: BatchPublishOptions = {
  * @param {PublishOptions} [options] Configuration object.
  */
 export class Publisher {
-  // tslint:disable-next-line variable-name
-  Promise?: PromiseConstructor;
   topic: Topic;
   settings!: PublishOptions;
   queue: Queue;
   orderedQueues: Map<string, OrderedQueue>;
   constructor(topic: Topic, options?: PublishOptions) {
-    if (topic.Promise) {
-      this.Promise = topic.Promise;
-    }
-
     this.setOptions(options);
     this.topic = topic;
     this.queue = new Queue(this);

src/snapshot.ts

@@ -103,13 +103,8 @@ export type SeekResponse = [google.pubsub.v1.ISeekResponse];
 export class Snapshot {
   parent: Subscription | PubSub;
   name: string;
-  // tslint:disable-next-line variable-name
-  Promise?: PromiseConstructor;
   metadata?: google.pubsub.v1.ISnapshot;
   constructor(parent: Subscription | PubSub, name: string) {
-    if (parent instanceof PubSub) {
-      this.Promise = parent.Promise;
-    }
     this.parent = parent;
     this.name = Snapshot.formatName_(parent.projectId, name);
   }

src/topic.ts

@@ -100,8 +100,6 @@ export type MessageOptions = PubsubMessage & {json?: any};
  * const topic = pubsub.topic('ordered-topic', {enableMessageOrdering: true});
  */
 export class Topic {
-  // tslint:disable-next-line variable-name
-  Promise?: PromiseConstructor;
   name: string;
   parent: PubSub;
   pubsub: PubSub;
@@ -114,9 +112,6 @@ export class Topic {
   ) as () => ObjectStream<Subscription>;
 
   constructor(pubsub: PubSub, name: string, options?: PublishOptions) {
-    if (pubsub.Promise) {
-      this.Promise = pubsub.Promise;
-    }
     /**
      * The fully qualified name of this topic.
      * @name Topic#name

test/iam.ts

@@ -37,7 +37,6 @@ describe('IAM', () => {
 
   const PUBSUB = ({
     options: {},
-    Promise: {},
     request: util.noop,
   } as {}) as PubSub;
   const ID = 'id';
@@ -53,10 +52,6 @@ describe('IAM', () => {
   });
 
   describe('initialization', () => {
-    it('should localize pubsub.Promise', () => {
-      assert.strictEqual(iam.Promise, PUBSUB.Promise);
-    });
-
     it('should localize pubsub', () => {
       assert.strictEqual(iam.pubsub, PUBSUB);
     });

test/publisher/index.ts

@@ -97,12 +97,6 @@ describe('Publisher', () => {
       assert(promisified);
     });
 
-    it('should localize Promise class if set', () => {
-      const t = {Promise} as Topic;
-      publisher = new Publisher(t);
-      assert.strictEqual(publisher.Promise, Promise);
-    });
-
     it('should capture user options', () => {
       const stub = sandbox.stub(Publisher.prototype, 'setOptions');
 

test/pubsub.ts

@@ -151,7 +151,6 @@ describe('PubSub', () => {
   let pubsub: pubsubTypes.PubSub;
   const OPTIONS = {
     projectId: PROJECT_ID,
-    promise: {},
   } as pubsubTypes.ClientConfig;
 
   const PUBSUB_EMULATOR_HOST = process.env.PUBSUB_EMULATOR_HOST;

test/snapshot.ts

@@ -84,12 +84,6 @@ describe('Snapshot', () => {
       assert(promisified);
     });
 
-    it('should localize parent.Promise', () => {
-      const pubsub = new PubSub();
-      snapshot = new Snapshot(pubsub, SNAPSHOT_NAME);
-      assert.strictEqual(snapshot.Promise, pubsub.Promise);
-    });
-
     it('should localize the parent', () => {
       assert.strictEqual(snapshot.parent, SUBSCRIPTION);
     });

test/subscription.ts

@@ -89,7 +89,6 @@ describe('Subscription', () => {
 
   const PUBSUB = ({
     projectId: PROJECT_ID,
-    Promise: {},
     request: util.noop,
     createSubscription: util.noop,
   } as {}) as PubSub;

test/topic.ts

@@ -95,7 +95,6 @@ describe('Topic', () => {
 
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   const PUBSUB: any = {
-    Promise: {},
     projectId: PROJECT_ID,
     createTopic: util.noop,
     request: util.noop,
@@ -132,10 +131,6 @@ describe('Topic', () => {
       assert(promisified);
     });
 
-    it('should localize pubsub.Promise', () => {
-      assert.strictEqual(topic.Promise, PUBSUB.Promise);
-    });
-
     it('should format the name', () => {
       const formattedName = 'a/b/c/d';