diff --git a/packages/firestore/src/api/credentials.ts b/packages/firestore/src/api/credentials.ts
index 8ce10d4c075..8346f4b577b 100644
--- a/packages/firestore/src/api/credentials.ts
+++ b/packages/firestore/src/api/credentials.ts
@@ -309,21 +309,19 @@ export function makeCredentialsProvider(
 
   switch (credentials.type) {
     case 'gapi':
-      const client = credentials.client;
-      // Make sure this is a Gapi client.
+      const client = credentials.client as Gapi;
+      // Make sure this really is a Gapi client.
       assert(
         !!(
           typeof client === 'object' &&
           client !== null &&
-          // @ts-ignore
           client['auth'] &&
-          // @ts-ignore
           client['auth']['getAuthHeaderValueForFirstParty']
         ),
         'unexpected gapi interface'
       );
       return new FirstPartyCredentialsProvider(
-        client as Gapi,
+        client,
         credentials.sessionIndex || '0'
       );
 
diff --git a/packages/firestore/src/local/shared_client_state.ts b/packages/firestore/src/local/shared_client_state.ts
index 2f4e523b8e7..c87b01d290f 100644
--- a/packages/firestore/src/local/shared_client_state.ts
+++ b/packages/firestore/src/local/shared_client_state.ts
@@ -462,9 +462,7 @@ export class SharedOnlineState {
 
     const validData =
       typeof onlineState === 'object' &&
-      // @ts-ignore Should allow arbitrary string index when checking to see
-      // if that string is a valid enum value.
-      OnlineState[onlineState.onlineState] !== undefined &&
+      onlineState.onlineState in OnlineState &&
       typeof onlineState.clientId === 'string';
 
     if (validData) {
diff --git a/packages/firestore/src/platform_browser/webchannel_connection.ts b/packages/firestore/src/platform_browser/webchannel_connection.ts
index 162a036b456..f264d0a4588 100644
--- a/packages/firestore/src/platform_browser/webchannel_connection.ts
+++ b/packages/firestore/src/platform_browser/webchannel_connection.ts
@@ -20,8 +20,8 @@ import {
   ErrorCode,
   EventType,
   WebChannel,
+  WebChannelOptions,
   XhrIo
-  // @ts-ignore
 } from '@firebase/webchannel-wrapper';
 
 import { isReactNative } from '@firebase/util';
@@ -193,7 +193,7 @@ export class WebChannelConnection implements Connection {
       '/channel'
     ];
     const webchannelTransport = createWebChannelTransport();
-    const request = {
+    const request: WebChannelOptions = {
       // Background channel test avoids the initial two test calls and decreases
       // initial cold start time.
       // TODO(dimond): wenboz@ mentioned this might affect use with proxies and
@@ -224,7 +224,7 @@ export class WebChannelConnection implements Connection {
       forceLongPolling: this.forceLongPolling
     };
 
-    this.modifyHeadersForRequest(request.initMessageHeaders, token);
+    this.modifyHeadersForRequest(request.initMessageHeaders!, token);
 
     // Sending the custom headers we just added to request.initMessageHeaders
     // (Authorization, etc.) will trigger the browser to make a CORS preflight
@@ -244,8 +244,7 @@ export class WebChannelConnection implements Connection {
     // ReactNative and so we exclude it, which just means ReactNative may be
     // subject to the extra network roundtrip for CORS preflight.
     if (!isReactNative()) {
-      // @ts-ignore
-      request['httpHeadersOverwriteParam'] = '$httpHeaders';
+      request.httpHeadersOverwriteParam = '$httpHeaders';
     }
 
     const url = urlParts.join('');
@@ -345,11 +344,10 @@ export class WebChannelConnection implements Connection {
           // (and only errors) to be wrapped in an extra array. To be forward
           // compatible with the bug we need to check either condition. The latter
           // can be removed once the fix has been rolled out.
+          // tslint:disable-next-line:no-any msgData.error is not typed.
+          const msgDataAsAny: any = msgData;
           const error =
-            // tslint:disable-next-line:no-any msgData.error is not typed.
-            (msgData as any).error ||
-            // @ts-ignore
-            (msgData[0] && msgData[0].error);
+            msgDataAsAny.error || (msgDataAsAny[0] && msgDataAsAny[0].error);
           if (error) {
             log.debug(LOG_TAG, 'WebChannel received error:', error);
             // error.status will be a string like 'OK' or 'NOT_FOUND'.
diff --git a/packages/firestore/src/platform_node/grpc_connection.ts b/packages/firestore/src/platform_node/grpc_connection.ts
index 8567cd87e48..da6b1a7f262 100644
--- a/packages/firestore/src/platform_node/grpc_connection.ts
+++ b/packages/firestore/src/platform_node/grpc_connection.ts
@@ -86,8 +86,8 @@ export class GrpcConnection implements Connection {
   private cachedStub: GeneratedGrpcStub | null = null;
 
   constructor(protos: grpc.GrpcObject, private databaseInfo: DatabaseInfo) {
-    // @ts-ignore
-    this.firestore = protos['google']['firestore']['v1'];
+    // tslint:disable-next-line:no-any
+    this.firestore = (protos as any)['google']['firestore']['v1'];
   }
 
   private ensureActiveStub(): GeneratedGrpcStub {
diff --git a/packages/firestore/src/util/misc.ts b/packages/firestore/src/util/misc.ts
index 026c5bc34da..ca2750757bb 100644
--- a/packages/firestore/src/util/misc.ts
+++ b/packages/firestore/src/util/misc.ts
@@ -18,6 +18,7 @@
 import { assert } from './assert';
 
 export type EventHandler<E> = (value: E) => void;
+export type Indexable = { [k: string]: unknown };
 
 // tslint:disable-next-line:class-as-namespace
 export class AutoId {
diff --git a/packages/firestore/test/unit/local/web_storage_shared_client_state.test.ts b/packages/firestore/test/unit/local/web_storage_shared_client_state.test.ts
index 6b173f85cca..e4a15d8f9d4 100644
--- a/packages/firestore/test/unit/local/web_storage_shared_client_state.test.ts
+++ b/packages/firestore/test/unit/local/web_storage_shared_client_state.test.ts
@@ -205,10 +205,9 @@ describe('WebStorageSharedClientState', () => {
     // We capture the listener here so that we can invoke it from the local
     // client. If we directly relied on WebStorage listeners, we would not
     // receive events for local writes.
-    // @ts-ignore
-    window.addEventListener = (type: string, callback: WebStorageCallback) => {
+    window.addEventListener = (type: string, callback: unknown) => {
       if (type === 'storage') {
-        webStorageCallbacks.push(callback);
+        webStorageCallbacks.push(callback as WebStorageCallback);
       }
     };
     window.removeEventListener = () => {};
diff --git a/packages/firestore/test/unit/remote/node/serializer.test.ts b/packages/firestore/test/unit/remote/node/serializer.test.ts
index b2de0327f1a..5f8f5eea681 100644
--- a/packages/firestore/test/unit/remote/node/serializer.test.ts
+++ b/packages/firestore/test/unit/remote/node/serializer.test.ts
@@ -54,6 +54,7 @@ import {
   WatchTargetChangeState
 } from '../../../../src/remote/watch_change';
 import { Code, FirestoreError } from '../../../../src/util/error';
+import { Indexable } from '../../../../src/util/misc';
 import * as obj from '../../../../src/util/obj';
 import * as types from '../../../../src/util/types';
 import { addEqualityMatcher } from '../../../util/equality_matcher';
@@ -156,8 +157,9 @@ describe('Serializer', () => {
         const actualProtobufjsProto: ProtobufJS.Message = ValueMessage.fromObject(
           actualJsonProto
         );
-        // @ts-ignore
-        expect(actualProtobufjsProto[valueType]).to.deep.equal(protobufJsValue);
+        expect((actualProtobufjsProto as Indexable)[valueType]).to.deep.equal(
+          protobufJsValue
+        );
 
         // Convert protobufjs back to JSON.
         const returnJsonProto = ValueMessage.toObject(
diff --git a/packages/firestore/test/util/equality_matcher.ts b/packages/firestore/test/util/equality_matcher.ts
index 2ded6259fa3..d59f4ae175e 100644
--- a/packages/firestore/test/util/equality_matcher.ts
+++ b/packages/firestore/test/util/equality_matcher.ts
@@ -16,6 +16,7 @@
  */
 
 import { use } from 'chai';
+import { Equatable } from '../../src/util/misc';
 
 /**
  * @file This file provides a helper function to add a matcher that matches
@@ -28,10 +29,12 @@ function customDeepEqual(left: unknown, right: unknown): boolean {
   /**
    * START: Custom compare logic
    */
-  // @ts-ignore
-  if (left && typeof left.isEqual === 'function') return left.isEqual(right);
-  // @ts-ignore
-  if (right && typeof right.isEqual === 'function') return right.isEqual(left);
+  if (typeof left === 'object' && left && 'isEqual' in left) {
+    return (left as Equatable<unknown>).isEqual(right);
+  }
+  if (typeof right === 'object' && right && 'isEqual' in right) {
+    return (right as Equatable<unknown>).isEqual(left);
+  }
   /**
    * END: Custom compare logic
    */
diff --git a/packages/webchannel-wrapper/package.json b/packages/webchannel-wrapper/package.json
index c1d5e1b485b..93595bd5410 100644
--- a/packages/webchannel-wrapper/package.json
+++ b/packages/webchannel-wrapper/package.json
@@ -26,6 +26,7 @@
     "type": "git",
     "url": "https://github.com/firebase/firebase-js-sdk.git"
   },
+  "typings": "src/index.d.ts",
   "bugs": {
     "url": "https://github.com/firebase/firebase-js-sdk/issues"
   }
diff --git a/packages/webchannel-wrapper/src/index.d.ts b/packages/webchannel-wrapper/src/index.d.ts
new file mode 100644
index 00000000000..4aedb1a7c8b
--- /dev/null
+++ b/packages/webchannel-wrapper/src/index.d.ts
@@ -0,0 +1,56 @@
+/**
+ * @license
+ * Copyright 2019 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// TODO(mikelehen): Flesh out proper types (or figure out how to generate via
+// clutz or something).
+export class XhrIo {}
+export const ErrorCode: any;
+export const EventType: any;
+export namespace WebChannel {
+  export type EventType = any;
+  export const EventType: any;
+}
+
+type StringMap = { [key: string]: string };
+
+export interface WebChannelOptions {
+  messageHeaders?: StringMap;
+  initMessageHeaders?: StringMap;
+  messageContentType?: string;
+  messageUrlParams?: StringMap;
+  clientProtocolHeaderRequired?: boolean;
+  concurrentRequestLimit?: number;
+  supportsCrossDomainXhr?: boolean;
+  testUrl?: string;
+  sendRawJson?: boolean;
+  httpSessionIdParam?: string;
+  httpHeadersOverwriteParam?: string;
+  backgroundChannelTest?: boolean;
+  forceLongPolling?: boolean;
+  fastHandshake?: boolean;
+  disableRedac?: boolean;
+  clientProfile?: string;
+  internalChannelParams?: { [key: string]: boolean | number };
+  xmlHttpFactory?: unknown;
+  requestRefreshThresholds?: { [key: string]: number };
+}
+
+export interface WebChannelTransport {
+  createWebChannel(url: string, options: WebChannelOptions): any;
+}
+
+export function createWebChannelTransport(): WebChannelTransport;