diff --git a/package.json b/package.json
index 8a5424648f..035e3ac566 100644
--- a/package.json
+++ b/package.json
@@ -7,13 +7,11 @@
     "prebootstrap": "npm install",
     "bootstrap": "lerna bootstrap",
     "clean": "lerna clean -y && rm -Rf node_modules",
-    "check": "echo",
-    "check-ci": "echo",
-    "lint": "lerna run check --since HEAD --exclude-dependents",
+    "check": "lerna run check --since HEAD --exclude-dependents",
+    "check-ci": "lerna run check",
     "test": "lerna run test",
     "test-ci": "lerna run test-ci",
     "compile-ts": "lerna run compile-ts",
-    "start-async": "lerna exec npm run start-async --scope @mongosh/cli-repl",
     "compile-cli": "lerna run compile-ts --scope @mongosh/cli-repl --include-dependencies",
     "prestart-cli": "npm run compile-cli",
     "start-cli": "lerna exec npm start --scope @mongosh/cli-repl",
diff --git a/packages/browser-repl/src/components/utils/inspect.spec.ts b/packages/browser-repl/src/components/utils/inspect.spec.ts
index ae9203da64..4f49a3bf08 100644
--- a/packages/browser-repl/src/components/utils/inspect.spec.ts
+++ b/packages/browser-repl/src/components/utils/inspect.spec.ts
@@ -37,19 +37,6 @@ describe('inspect', () => {
         inspect(undefined)
       ).to.equal('undefined');
     });
-
-    it.skip('inspects Symbol', () => {
-      expect(
-        inspect(Symbol('123'))
-      ).to.equal('Symbol(123)');
-    });
-
-    it.skip('inspects BigInt', () => {
-      expect(
-        // eslint-disable-next-line no-undef
-        inspect(BigInt(1))
-      ).to.equal('1n');
-    });
   });
 
   context('with BSON types', () => {
diff --git a/packages/browser-runtime-core/src/interpreter/interpreter.spec.ts b/packages/browser-runtime-core/src/interpreter/interpreter.spec.ts
index 81a17a7c5f..e15660949c 100644
--- a/packages/browser-runtime-core/src/interpreter/interpreter.spec.ts
+++ b/packages/browser-runtime-core/src/interpreter/interpreter.spec.ts
@@ -159,23 +159,25 @@ describe('Interpreter', () => {
       ).to.equal(3);
     });
 
-    it.skip('can redeclare a top level function as function', async() => {
-      expect(
-        await testEvaluate(
-          'function f() { return 1; }',
-          'function f() { return 2; }',
-          'f()'
-        )
-      ).to.equal(2);
-    });
-
-    it.skip('can redeclare a top level function as var', async() => {
-      expect(
-        await testEvaluate(
-          'function sum(a, b) { return a + b; }',
-          'var sum = 1'
-        )
-      ).to.equal(1);
+    describe.skip('redeclare top level vars', () => {
+      it('can redeclare a top level function as function', async() => {
+        expect(
+          await testEvaluate(
+            'function f() { return 1; }',
+            'function f() { return 2; }',
+            'f()'
+          )
+        ).to.equal(2);
+      });
+
+      it('can redeclare a top level function as var', async() => {
+        expect(
+          await testEvaluate(
+            'function sum(a, b) { return a + b; }',
+            'var sum = 1'
+          )
+        ).to.equal(1);
+      });
     });
 
     it('cannot re-declare a top level function as let', async() => {
diff --git a/packages/build/.eslintignore b/packages/build/.eslintignore
new file mode 100644
index 0000000000..c176f20c35
--- /dev/null
+++ b/packages/build/.eslintignore
@@ -0,0 +1,4 @@
+node_modules
+lib
+coverage
+
diff --git a/packages/build/.eslintrc.js b/packages/build/.eslintrc.js
new file mode 100644
index 0000000000..4a958b44bd
--- /dev/null
+++ b/packages/build/.eslintrc.js
@@ -0,0 +1 @@
+module.exports = require('../../config/eslintrc.base');
diff --git a/packages/cli-repl/.eslintignore b/packages/cli-repl/.eslintignore
index ea3f37f224..f7ace5541d 100644
--- a/packages/cli-repl/.eslintignore
+++ b/packages/cli-repl/.eslintignore
@@ -1,3 +1,4 @@
 node_modules
 bin
 lib
+dist
diff --git a/packages/cli-repl/src/arg-mapper.spec.ts b/packages/cli-repl/src/arg-mapper.spec.ts
index f154904b43..f2b688a606 100644
--- a/packages/cli-repl/src/arg-mapper.spec.ts
+++ b/packages/cli-repl/src/arg-mapper.spec.ts
@@ -23,16 +23,6 @@ describe('arg-mapper.mapCliToDriver', () => {
     });
   });
 
-  context('when cli args have disableImplicitSessions', () => {
-    const cliOptions: CliOptions = { disableImplicitSessions: true };
-
-    it.skip('maps to explicitlyIgnoreSession', () => {
-      expect(mapCliToDriver(cliOptions)).to.deep.equal({
-        explicitlyIgnoreSession: true
-      });
-    });
-  });
-
   context('when cli args have quiet', () => {
     const cliOptions: CliOptions = { quiet: true };
 
diff --git a/packages/i18n/.eslintignore b/packages/i18n/.eslintignore
new file mode 100644
index 0000000000..491fc35975
--- /dev/null
+++ b/packages/i18n/.eslintignore
@@ -0,0 +1,2 @@
+node_modules
+lib
diff --git a/packages/i18n/.eslintrc.js b/packages/i18n/.eslintrc.js
new file mode 100644
index 0000000000..4a958b44bd
--- /dev/null
+++ b/packages/i18n/.eslintrc.js
@@ -0,0 +1 @@
+module.exports = require('../../config/eslintrc.base');
diff --git a/packages/i18n/package.json b/packages/i18n/package.json
index 904ef21c60..d2fb3217a3 100644
--- a/packages/i18n/package.json
+++ b/packages/i18n/package.json
@@ -15,7 +15,9 @@
     "compile-ts": "tsc -p tsconfig.json",
     "prepublish": "npm run compile-ts",
     "test": "mocha --timeout 60000 --colors -r ts-node/register \"./src/**/*.spec.ts\"",
-    "test-ci": "mocha --timeout 60000 -r ts-node/register \"./src/**/*.spec.ts\""
+    "test-ci": "mocha --timeout 60000 -r ts-node/register \"./src/**/*.spec.ts\"",
+    "lint": "eslint \"**/*.{js,ts,tsx}\"",
+    "check": "npm run lint"
   },
   "license": "Apache-2.0",
   "publishConfig": {
diff --git a/packages/i18n/src/catalog.ts b/packages/i18n/src/catalog.ts
index 54901cb320..16cf712555 100644
--- a/packages/i18n/src/catalog.ts
+++ b/packages/i18n/src/catalog.ts
@@ -1,5 +1,4 @@
-interface Catalog {
+export default interface Catalog {
   [prop: string]: any;
 }
 
-export default Catalog;
diff --git a/packages/i18n/src/translator.spec.ts b/packages/i18n/src/translator.spec.ts
index fd2797a861..c4bd340299 100644
--- a/packages/i18n/src/translator.spec.ts
+++ b/packages/i18n/src/translator.spec.ts
@@ -75,7 +75,7 @@ describe('Translator', () => {
         });
 
         context('when the key uses object notation', () => {
-          const translator = new Translator({ test: { test: 'value' }});
+          const translator = new Translator({ test: { test: 'value' } });
 
           context('when the key is found', () => {
             it('returns the translation', () => {
diff --git a/packages/i18n/src/translator.ts b/packages/i18n/src/translator.ts
index fe81823a22..66df0a3a67 100644
--- a/packages/i18n/src/translator.ts
+++ b/packages/i18n/src/translator.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/camelcase */
 import Mustache from 'mustache';
 import Catalog from './catalog';
 import en_US from './locales/en_US';
@@ -60,7 +61,7 @@ class Translator {
    *
    * @param {string} locale - The locale.
    */
-  setLocale(locale: string) {
+  setLocale(locale: string): void {
     if (MAPPINGS.hasOwnProperty(locale)) {
       this.locale = locale;
       this.catalog = MAPPINGS[locale];
@@ -100,7 +101,7 @@ class Translator {
     return Mustache.render(TEMPLATE, value);
   }
 
-  private find(key) {
+  private find(key): any {
     return key.split('.').reduce((a, b) => {
       return a ? a[b] : undefined;
     }, this.catalog);
diff --git a/packages/service-provider-browser/.eslintignore b/packages/service-provider-browser/.eslintignore
new file mode 100644
index 0000000000..c176f20c35
--- /dev/null
+++ b/packages/service-provider-browser/.eslintignore
@@ -0,0 +1,4 @@
+node_modules
+lib
+coverage
+
diff --git a/packages/service-provider-browser/.eslintrc.js b/packages/service-provider-browser/.eslintrc.js
new file mode 100644
index 0000000000..4a958b44bd
--- /dev/null
+++ b/packages/service-provider-browser/.eslintrc.js
@@ -0,0 +1 @@
+module.exports = require('../../config/eslintrc.base');
diff --git a/packages/service-provider-browser/package.json b/packages/service-provider-browser/package.json
index 2c4ff95f7e..03e3094728 100644
--- a/packages/service-provider-browser/package.json
+++ b/packages/service-provider-browser/package.json
@@ -15,7 +15,9 @@
     "compile-ts": "tsc -p tsconfig.json",
     "test": "karma start --colors",
     "test-ci": "karma start --colors",
-    "prepublish": "npm run compile-ts"
+    "prepublish": "npm run compile-ts",
+    "lint": "eslint \"**/*.{js,ts,tsx}\"",
+    "check": "npm run lint"
   },
   "license": "Apache-2.0",
   "publishConfig": {
diff --git a/packages/service-provider-browser/src/stitch-client.ts b/packages/service-provider-browser/src/stitch-client.ts
index 73eae9c08c..61338ed97e 100644
--- a/packages/service-provider-browser/src/stitch-client.ts
+++ b/packages/service-provider-browser/src/stitch-client.ts
@@ -2,8 +2,6 @@
  * Defines behaviour common to both the Stitch server and browser
  * client APIs.
  */
-interface StitchClient {
+export default interface StitchClient {
   auth: any;
 }
-
-export default StitchClient;
diff --git a/packages/service-provider-browser/src/stitch-mongo-client.ts b/packages/service-provider-browser/src/stitch-mongo-client.ts
index 94355428bc..42b916d74d 100644
--- a/packages/service-provider-browser/src/stitch-mongo-client.ts
+++ b/packages/service-provider-browser/src/stitch-mongo-client.ts
@@ -2,8 +2,7 @@
  * Defines behaviour common to both the Stitch server and browser
  * mongo client APIs.
  */
-interface StitchMongoClient {
+export default interface StitchMongoClient {
   db(name: string): any;
 }
 
-export default StitchMongoClient;
diff --git a/packages/service-provider-browser/src/stitch-service-provider-browser.integration.spec.ts b/packages/service-provider-browser/src/stitch-service-provider-browser.integration.spec.ts
index 7c34bfb855..d4b4554bd8 100644
--- a/packages/service-provider-browser/src/stitch-service-provider-browser.integration.spec.ts
+++ b/packages/service-provider-browser/src/stitch-service-provider-browser.integration.spec.ts
@@ -20,6 +20,7 @@ describe('StitchServiceProviderBrowser [ integration ]', function() {
 
     before(async() => {
       stitchTransport = await StitchServiceProviderBrowser.fromAppId(stitchAppId, serviceName);
+      // eslint-disable-next-line @typescript-eslint/camelcase
       testScope = { testId: testId, owner_id: stitchTransport.userId };
     });
 
@@ -35,7 +36,7 @@ describe('StitchServiceProviderBrowser [ integration ]', function() {
 
         beforeEach(async() => {
           result = await stitchTransport.
-            aggregate('music', 'bands', [{ $match: { ...testScope, name: 'Aphex Twin' }}]);
+            aggregate('music', 'bands', [{ $match: { ...testScope, name: 'Aphex Twin' } }]);
         });
 
         it('executes the command and resolves the result', async() => {
@@ -43,14 +44,6 @@ describe('StitchServiceProviderBrowser [ integration ]', function() {
           expect(docs).to.deep.equal([]);
         });
       });
-
-      context('when running against a database', () => {
-        it.skip('it rejects the action', () => {
-          return stitchTransport.aggregate('admin', null, [{ $currentOp: {}}]).catch((err) => {
-            expect(err).to.not.equal(null);
-          });
-        });
-      });
     });
 
     describe('#bulkWrite', () => {
@@ -181,7 +174,7 @@ describe('StitchServiceProviderBrowser [ integration ]', function() {
 
         beforeEach(async() => {
           const filter = { ...testScope, name: 'Aphex Twin' };
-          const update = { $set: { name: 'Richard James' }};
+          const update = { $set: { name: 'Richard James' } };
 
           result = await stitchTransport.
             findOneAndUpdate('music', 'bands', filter, update);
@@ -253,7 +246,7 @@ describe('StitchServiceProviderBrowser [ integration ]', function() {
 
         beforeEach(async() => {
           const filter = { ...testScope, name: 'Aphex Twin' };
-          const update = { $set: { name: 'Richard James' }};
+          const update = { $set: { name: 'Richard James' } };
 
           result = await stitchTransport.
             updateMany('music', 'bands', filter, update);
@@ -271,7 +264,7 @@ describe('StitchServiceProviderBrowser [ integration ]', function() {
 
         beforeEach(async() => {
           const filter = { ...testScope, name: 'Aphex Twin' };
-          const update = { $set: { name: 'Richard James' }};
+          const update = { $set: { name: 'Richard James' } };
 
           result = await stitchTransport.
             updateOne('music', 'bands', filter, update);
diff --git a/packages/service-provider-browser/src/stitch-service-provider-browser.ts b/packages/service-provider-browser/src/stitch-service-provider-browser.ts
index 121f8cb85f..621535476c 100644
--- a/packages/service-provider-browser/src/stitch-service-provider-browser.ts
+++ b/packages/service-provider-browser/src/stitch-service-provider-browser.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
 import {
   ServiceProvider,
   Result,
@@ -52,8 +53,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
    */
   static async fromAppId(
     stitchAppId: string,
-    serviceName: string) : Promise<StitchServiceProviderBrowser> {
-
+    serviceName: string): Promise<StitchServiceProviderBrowser> {
     const client = Stitch.initializeDefaultAppClient(stitchAppId);
     try {
       await client.auth.loginWithCredential(new AnonymousCredential());
@@ -64,7 +64,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     return new StitchServiceProviderBrowser(client, serviceName);
   }
 
-  async getNewConnection(uri, options) {
+  async getNewConnection(uri, options): Promise<any> {
     throw new MongoshUnimplementedError();
   }
 
@@ -106,8 +106,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
   aggregate(
     database: string,
     collection: string,
-    pipeline: object[] = []) : Cursor {
-
+    pipeline: object[] = []): Cursor {
     return this.stitchTransport.aggregate(database, collection, pipeline);
   }
 
@@ -116,7 +115,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
    *
    * @returns {Promise} The rejected promise.
    */
-  bulkWrite() : Promise<BulkWriteResult> {
+  bulkWrite(): Promise<BulkWriteResult> {
     return this.stitchTransport.bulkWrite();
   }
 
@@ -134,8 +133,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     database: string,
     collection: string,
     filter: object = {},
-    options: object = {}) : Promise<Result> {
-
+    options: object = {}): Promise<Result> {
     return this.stitchTransport.countDocuments(database, collection, filter, options);
   }
 
@@ -156,71 +154,71 @@ class StitchServiceProviderBrowser implements ServiceProvider {
   }
 
   aggregateDb(database: string, pipeline: Document[], options?: Document, dbOptions?: DatabaseOptions): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   count(db: string, coll: string, query?: Document, options?: Document, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   isCapped(database: string, collection: string, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   getIndexes(database: string, collection: string, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   listCollections(database: string, filter?: Document, options?: Document, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   stats(database: string, collection: string, options?: Document, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   dropDatabase(database: string, writeConcern?: WriteConcern, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
-  findAndModify(database: string, collection: string, query: Document, sort: any[] | Document, update: Document, options?: Document, dbOptions?: DatabaseOptions) {
-    throw new Error("Method not implemented.");
+  findAndModify(database: string, collection: string, query: Document, sort: any[] | Document, update: Document, options?: Document, dbOptions?: DatabaseOptions): Promise<any> {
+    throw new Error('Method not implemented.');
   }
 
   save(database: string, collection: string, doc: Document, options?: Document, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   remove(database: string, collection: string, query: Document, options?: Document, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   convertToCapped(database: string, collection: string, size: number, options?: CommandOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   createIndexes(database: string, collection: string, indexSpecs: Document[], options?: Document, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   dropIndexes(database: string, collection: string, indexes: string | Document | Document[] | string[], commandOptions?: CommandOptions, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   reIndex(database: string, collection: string, options?: CommandOptions, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   dropCollection(database: string, collection: string, dbOptions?: DatabaseOptions): Promise<boolean> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   renameCollection(database: string, oldName: string, newName: string, options?: Document, dbOptions?: DatabaseOptions): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   close(boolean: any): Promise<void> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   getCmdLineOpts(): Promise<Result> {
@@ -236,7 +234,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
   }
 
   listDatabases(database: string): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   /**
@@ -252,8 +250,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
   deleteMany(
     database: string,
     collection: string,
-    filter: object = {}) : Promise<Result> {
-
+    filter: object = {}): Promise<Result> {
     return this.stitchTransport.deleteMany(database, collection, filter);
   }
 
@@ -270,8 +267,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
   deleteOne(
     database: string,
     collection: string,
-    filter: object = {}) : Promise<Result> {
-
+    filter: object = {}): Promise<Result> {
     return this.stitchTransport.deleteOne(database, collection, filter);
   }
 
@@ -280,7 +276,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
    *
    * @returns {Cursor} The unsupported cursor.
    */
-  distinct() : Promise<any> {
+  distinct(): Promise<any> {
     return this.stitchTransport.distinct();
   }
 
@@ -289,7 +285,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
    *
    * @returns {Promise} The rejected promise.
    */
-  estimatedDocumentCount() : Promise<Result> {
+  estimatedDocumentCount(): Promise<Result> {
     return this.stitchTransport.estimatedDocumentCount();
   }
 
@@ -307,8 +303,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     database: string,
     collection: string,
     filter: object = {},
-    options: object = {}) : any {
-
+    options: object = {}): any {
     return this.stitchTransport.find(database, collection, filter, options);
   }
 
@@ -326,8 +321,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     database: string,
     collection: string,
     filter: object = {},
-    options: object = {}) : Promise<Result> {
-
+    options: object = {}): Promise<Result> {
     return this.stitchTransport.findOneAndDelete(database, collection, filter, options);
   }
 
@@ -347,8 +341,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     collection: string,
     filter: object = {},
     replacement: object = {},
-    options: object = {}) : Promise<Result> {
-
+    options: object = {}): Promise<Result> {
     return this.stitchTransport.findOneAndReplace(database, collection, filter, replacement, options);
   }
 
@@ -368,8 +361,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     collection: string,
     filter: object = {},
     update: object = {},
-    options: object = {}) : Promise<Result> {
-
+    options: object = {}): Promise<Result> {
     return this.stitchTransport.findOneAndUpdate(database, collection, filter, update, options);
   }
 
@@ -387,8 +379,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     database: string,
     collection: string,
     docs: object[] = [],
-    options: object = {}) : Promise<Result> {
-
+    options: object = {}): Promise<Result> {
     return this.stitchTransport.insertMany(database, collection, docs);
   }
 
@@ -406,8 +397,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     database: string,
     collection: string,
     doc: object = {},
-    options: object = {}) : Promise<Result> {
-
+    options: object = {}): Promise<Result> {
     return this.stitchTransport.insertOne(database, collection, doc);
   }
 
@@ -416,7 +406,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
    *
    * @returns {Promise} The rejected promise.
    */
-  replaceOne() : Promise<Result> {
+  replaceOne(): Promise<Result> {
     return this.stitchTransport.replaceOne();
   }
 
@@ -425,7 +415,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
    *
    * @returns {Promise} The rejected promise.
    */
-  runCommand() : Promise<Result> {
+  runCommand(): Promise<Result> {
     return this.stitchTransport.runCommand();
   }
 
@@ -445,8 +435,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     collection: string,
     filter: object = {},
     update: object = {},
-    options: object = {}) : Promise<Result> {
-
+    options: object = {}): Promise<Result> {
     return this.stitchTransport.updateMany(database, collection, filter, update, options);
   }
 
@@ -466,8 +455,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
     collection: string,
     filter: object = {},
     update: object = {},
-    options: object = {}) : Promise<Result> {
-
+    options: object = {}): Promise<Result> {
     return this.stitchTransport.updateOne(database, collection, filter, update, options);
   }
 
@@ -476,7 +464,7 @@ class StitchServiceProviderBrowser implements ServiceProvider {
    *
    * @returns {String} The user id.
    */
-  get userId() : string {
+  get userId(): string {
     return this.stitchTransport.userId;
   }
 }
diff --git a/packages/service-provider-browser/src/stitch-transport.spec.ts b/packages/service-provider-browser/src/stitch-transport.spec.ts
index 3d6bcf1d47..7e0301367d 100644
--- a/packages/service-provider-browser/src/stitch-transport.spec.ts
+++ b/packages/service-provider-browser/src/stitch-transport.spec.ts
@@ -16,7 +16,7 @@ import StitchMongoClient from './stitch-mongo-client';
  *
  * @returns {Stub} The client stub to pass to the transport.
  */
-const createClientStub = (collectionStub) => {
+const createClientStub = (collectionStub): any => {
   const dbStub = {
     collection: sinon.stub().returns(collectionStub)
   };
@@ -25,8 +25,8 @@ const createClientStub = (collectionStub) => {
   };
 };
 
-const createStitchClientStub = (): StitchClient => ({auth: null});
-const createMongoClientStub = (): StitchMongoClient => ({db: () => {}});
+const createStitchClientStub = (): StitchClient => ({ auth: null });
+const createMongoClientStub = (): StitchMongoClient => ({ db: (): void => {} });
 
 describe('StitchTransport', () => {
   const stitchClient = createStitchClientStub();
@@ -46,7 +46,7 @@ describe('StitchTransport', () => {
 
   describe('#aggregate', () => {
     let stitchTransport;
-    const pipeline = [{ $match: { name: 'Aphex Twin' }}];
+    const pipeline = [{ $match: { name: 'Aphex Twin' } }];
     const aggResult = [{ name: 'Aphex Twin' }];
 
     const aggMock = sinon.mock().withArgs(pipeline).
@@ -73,7 +73,7 @@ describe('StitchTransport', () => {
 
   describe('#bulkWrite', () => {
     let stitchTransport;
-    const requests = [{ insertOne: { name: 'Aphex Twin' }}];
+    const requests = [{ insertOne: { name: 'Aphex Twin' } }];
 
     beforeEach(() => {
       stitchTransport = new StitchTransport(stitchClient, createClientStub({}));
@@ -115,7 +115,7 @@ describe('StitchTransport', () => {
 
   describe('#deleteMany', () => {
     let stitchTransport;
-    const commandResult = { result: { n: 1, ok: 1 }};
+    const commandResult = { result: { n: 1, ok: 1 } };
     const deleteMock = sinon.mock().once().withArgs({}).resolves(commandResult);
 
     beforeEach(() => {
@@ -138,7 +138,7 @@ describe('StitchTransport', () => {
 
   describe('#deleteOne', () => {
     let stitchTransport;
-    const commandResult = { result: { n: 1, ok: 1 }};
+    const commandResult = { result: { n: 1, ok: 1 } };
     const deleteMock = sinon.mock().once().withArgs({}).resolves(commandResult);
 
     beforeEach(() => {
@@ -223,7 +223,7 @@ describe('StitchTransport', () => {
 
   describe('#findOneAndDelete', () => {
     let stitchTransport;
-    const commandResult = { result: { n: 1, ok: 1 }};
+    const commandResult = { result: { n: 1, ok: 1 } };
     const findMock = sinon.mock().once().withArgs({}).resolves(commandResult);
 
     beforeEach(() => {
@@ -246,7 +246,7 @@ describe('StitchTransport', () => {
 
   describe('#findOneAndReplace', () => {
     let stitchTransport;
-    const commandResult = { result: { n: 1, ok: 1 }};
+    const commandResult = { result: { n: 1, ok: 1 } };
     const filter = { name: 'Aphex Twin' };
     const replacement = { name: 'Richard James' };
     const findMock = sinon.mock().once().withArgs(filter, replacement).
@@ -273,9 +273,9 @@ describe('StitchTransport', () => {
 
   describe('#findOneAndUpdate', () => {
     let stitchTransport;
-    const commandResult = { result: { n: 1, ok: 1 }};
+    const commandResult = { result: { n: 1, ok: 1 } };
     const filter = { name: 'Aphex Twin' };
-    const update = { $set: { name: 'Richard James' }};
+    const update = { $set: { name: 'Richard James' } };
     const findMock = sinon.mock().once().withArgs(filter, update).
       resolves(commandResult);
 
@@ -301,7 +301,7 @@ describe('StitchTransport', () => {
   describe('#insertMany', () => {
     let stitchTransport;
     const doc = { name: 'Aphex Twin' };
-    const commandResult = { result: { n: 1, ok: 1 }};
+    const commandResult = { result: { n: 1, ok: 1 } };
     const insertMock = sinon.mock().once().withArgs([ doc ]).resolves(commandResult);
 
     beforeEach(() => {
@@ -325,7 +325,7 @@ describe('StitchTransport', () => {
   describe('#insertOne', () => {
     let stitchTransport;
     const doc = { name: 'Aphex Twin' };
-    const commandResult = { result: { n: 1, ok: 1 }};
+    const commandResult = { result: { n: 1, ok: 1 } };
     const insertMock = sinon.mock().once().withArgs(doc).resolves(commandResult);
 
     beforeEach(() => {
@@ -387,8 +387,8 @@ describe('StitchTransport', () => {
   describe('#updateOne', () => {
     let stitchTransport;
     const filter = { name: 'Aphex Twin' };
-    const update = { $set: { name: 'Richard James' }};
-    const commandResult = { result: { n: 1, ok: 1 }};
+    const update = { $set: { name: 'Richard James' } };
+    const commandResult = { result: { n: 1, ok: 1 } };
     const updateMock = sinon.mock().once().withArgs(filter, update).
       resolves(commandResult);
 
@@ -413,8 +413,8 @@ describe('StitchTransport', () => {
   describe('#updateMany', () => {
     let stitchTransport;
     const filter = { name: 'Aphex Twin' };
-    const update = { $set: { name: 'Richard James' }};
-    const commandResult = { result: { n: 1, ok: 1 }};
+    const update = { $set: { name: 'Richard James' } };
+    const commandResult = { result: { n: 1, ok: 1 } };
     const updateMock = sinon.mock().once().withArgs(filter, update).
       resolves(commandResult);
 
diff --git a/packages/service-provider-browser/src/stitch-transport.ts b/packages/service-provider-browser/src/stitch-transport.ts
index 1840137cde..af1b97fdea 100644
--- a/packages/service-provider-browser/src/stitch-transport.ts
+++ b/packages/service-provider-browser/src/stitch-transport.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
 import i18n from '@mongosh/i18n';
 
 import StitchClient from './stitch-client';
@@ -31,15 +32,13 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    * @param {String} database - The database name.
    * @param {String} collection - The collection name.
    * @param {Array} pipeline - The aggregation pipeline.
-   * @param {Document} options - The pipeline options.
    *
    * @returns {Cursor} The aggregation cursor.
    */
   aggregate(
     database: string,
     collection: string,
-    pipeline: Document[] = []) : Cursor {
-
+    pipeline: Document[] = []): Cursor {
     if (collection === null) {
       return new UnsupportedCursor(i18n.__(AGG_ON_DB));
     }
@@ -52,7 +51,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    *
    * @returns {Promise} The rejected promise.
    */
-  bulkWrite() : Promise<Result> {
+  bulkWrite(): Promise<Result> {
     return Promise.reject(`Bulk write ${i18n.__(NOT_IMPLEMENTED)}`);
   }
 
@@ -70,8 +69,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
     database: string,
     collection: string,
     filter: Document = {},
-    options: Document = {}) : Promise<Result> {
-
+    options: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).count(filter, options);
   }
 
@@ -93,15 +91,13 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    * @param {String} database - The database name.
    * @param {String} collection - The collection name.
    * @param {Document} filter - The filter.
-   * @param {Document} options - The delete many options.
    *
    * @returns {Promise} The promise of the result.
    */
   deleteMany(
     database: string,
     collection: string,
-    filter: Document = {}) : Promise<Result> {
-
+    filter: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).
       deleteMany(filter);
   }
@@ -112,15 +108,13 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    * @param {String} database - The database name.
    * @param {String} collection - The collection name.
    * @param {Document} filter - The filter.
-   * @param {Document} options - The delete one options.
    *
    * @returns {Promise} The promise of the result.
    */
   deleteOne(
     database: string,
     collection: string,
-    filter: Document = {}) : Promise<Result> {
-
+    filter: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).
       deleteOne(filter);
   }
@@ -130,7 +124,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    *
    * @returns {Cursor} The rejected promise when toArray is called.
    */
-  distinct() : Promise<any> {
+  distinct(): Promise<any> {
     return Promise.resolve(new UnsupportedCursor(`Distinct ${i18n.__(NOT_IMPLEMENTED)}`));
   }
 
@@ -139,7 +133,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    *
    * @returns {Promise} The rejected promise.
    */
-  estimatedDocumentCount() : Promise<Result> {
+  estimatedDocumentCount(): Promise<Result> {
     return Promise.reject(`Estimated document count ${i18n.__(NOT_IMPLEMENTED)}`);
   }
 
@@ -157,8 +151,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
     database: string,
     collection: string,
     filter: Document = {},
-    options: Document = {}) : Cursor {
-
+    options: Document = {}): Cursor {
     return this.db(database).collection(collection).
       find(filter, options);
   }
@@ -177,8 +170,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
     database: string,
     collection: string,
     filter: Document = {},
-    options: Document = {}) : Promise<Result> {
-
+    options: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).
       findOneAndDelete(filter, options);
   }
@@ -199,8 +191,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
     collection: string,
     filter: Document = {},
     replacement: Document = {},
-    options: Document = {}) : Promise<Result> {
-
+    options: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).
       findOneAndReplace(filter, replacement, options);
   }
@@ -221,8 +212,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
     collection: string,
     filter: Document = {},
     update: Document = {},
-    options: Document = {}) : Promise<Result> {
-
+    options: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).
       findOneAndUpdate(filter, update, options);
   }
@@ -241,8 +231,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
     database: string,
     collection: string,
     docs: Document[] = [],
-    options: Document = {}) : Promise<Result> {
-
+    options: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).
       insertMany(docs);
   }
@@ -261,8 +250,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
     database: string,
     collection: string,
     doc: Document = {},
-    options: Document = {}) : Promise<Result> {
-
+    options: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).
       insertOne(doc);
   }
@@ -272,7 +260,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    *
    * @returns {Promise} The rejected promise.
    */
-  replaceOne() : Promise<Result> {
+  replaceOne(): Promise<Result> {
     return Promise.reject(`Replace one ${i18n.__(NOT_IMPLEMENTED)}`);
   }
 
@@ -281,7 +269,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    *
    * @returns {Promise} The rejected promise.
    */
-  runCommand() : Promise<Result> {
+  runCommand(): Promise<Result> {
     return Promise.reject(`Running a direct command ${i18n.__(NOT_IMPLEMENTED)}`);
   }
 
@@ -301,8 +289,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
     collection: string,
     filter: Document = {},
     update: Document = {},
-    options: Document = {}) : Promise<Result> {
-
+    options: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).
       updateMany(filter, update, options);
   }
@@ -323,8 +310,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
     collection: string,
     filter: Document = {},
     update: Document = {},
-    options: Document = {}) : Promise<Result> {
-
+    options: Document = {}): Promise<Result> {
     return this.db(database).collection(collection).
       updateOne(filter, update, options);
   }
@@ -334,7 +320,7 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    *
    * @returns {String} The user id.
    */
-  get userId() : string {
+  get userId(): string {
     return this.stitchClient.auth.user.id;
   }
 
@@ -343,9 +329,9 @@ class StitchTransport<S extends StitchClient, M extends StitchMongoClient> {
    *
    * @param {String} name - The database name.
    *
-   * @returns {RemoteMongoDaatabase} The database.
+   * @returns {RemoteMongoDatabase} The database.
    */
-  private db(name: string) {
+  private db(name: string): any {
     return this.mongoClient.db(name);
   }
 }
diff --git a/packages/service-provider-browser/src/unsupported-cursor.ts b/packages/service-provider-browser/src/unsupported-cursor.ts
index fa8b24e6b2..5a4be2ac43 100644
--- a/packages/service-provider-browser/src/unsupported-cursor.ts
+++ b/packages/service-provider-browser/src/unsupported-cursor.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
 import { Document, Cursor } from '@mongosh/service-provider-core';
 
 /**
@@ -16,123 +17,123 @@ class UnsupportedCursor implements Cursor {
   }
 
   addOption(option: number): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   allowPartialResults(): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   batchSize(size: number): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   close(options: Document): Promise<void> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   clone(): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   isClosed(): boolean {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   collation(spec: Document): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   comment(cmt: string): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   count(): Promise<number> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   forEach(f: any): Promise<void> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   hasNext(): Promise<boolean> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   hint(index: string): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   isExhausted(): Promise<boolean> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   itcount(): Promise<number> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   limit(value: number): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   map(f: any): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   max(indexBounds: Document): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   maxTimeMS(value: number): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   min(indexBounds: Document): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   next(): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   noCursorTimeout(): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   oplogReplay(): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   projection(spec: Document): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   readPref(preference: string, tagSet?: Document[]): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   returnKey(enabled: boolean): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   size(): Promise<number> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   skip(value: number): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   sort(spec: Document): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   tailable(): Cursor {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   explain(verbosity: string): Promise<any> {
-    throw new Error("Method not implemented.");
+    throw new Error('Method not implemented.');
   }
 
   /**
diff --git a/packages/service-provider-core/.eslintignore b/packages/service-provider-core/.eslintignore
new file mode 100644
index 0000000000..491fc35975
--- /dev/null
+++ b/packages/service-provider-core/.eslintignore
@@ -0,0 +1,2 @@
+node_modules
+lib
diff --git a/packages/service-provider-core/.eslintrc.js b/packages/service-provider-core/.eslintrc.js
new file mode 100644
index 0000000000..4a958b44bd
--- /dev/null
+++ b/packages/service-provider-core/.eslintrc.js
@@ -0,0 +1 @@
+module.exports = require('../../config/eslintrc.base');
diff --git a/packages/service-provider-core/package.json b/packages/service-provider-core/package.json
index 9be9603da9..3e2d449ce5 100644
--- a/packages/service-provider-core/package.json
+++ b/packages/service-provider-core/package.json
@@ -13,7 +13,9 @@
   },
   "scripts": {
     "compile-ts": "tsc -p tsconfig.json",
-    "prepublish": "npm run compile-ts"
+    "prepublish": "npm run compile-ts",
+    "lint": "eslint \"**/*.{js,ts,tsx}\"",
+    "check": "npm run lint"
   },
   "license": "Apache-2.0",
   "publishConfig": {
diff --git a/packages/service-provider-core/src/admin.ts b/packages/service-provider-core/src/admin.ts
index 5a8f0a5dfa..35fa068695 100644
--- a/packages/service-provider-core/src/admin.ts
+++ b/packages/service-provider-core/src/admin.ts
@@ -1,5 +1,5 @@
-import Result from "./result";
-import { ReplPlatform } from "./platform";
+import Result from './result';
+import { ReplPlatform } from './platform';
 
 export default interface Admin {
    /**
diff --git a/packages/service-provider-core/src/bulk-write-result.ts b/packages/service-provider-core/src/bulk-write-result.ts
index 23c13649bf..9e58968499 100644
--- a/packages/service-provider-core/src/bulk-write-result.ts
+++ b/packages/service-provider-core/src/bulk-write-result.ts
@@ -1,6 +1,6 @@
 export default interface BulkWriteResult {
   result: {
-    ok: number
+    ok: number;
   };
 
   /**
@@ -31,10 +31,10 @@ export default interface BulkWriteResult {
   /**
    * Ids of upserted documents.
    */
-  upsertedIds: {[index: number]: any}
+  upsertedIds: {[index: number]: any};
 
   /**
    * Ids of inserted documents.
    */
-  insertedIds: {[index: number]: any}
-}
\ No newline at end of file
+  insertedIds: {[index: number]: any};
+}
diff --git a/packages/service-provider-core/src/closable.ts b/packages/service-provider-core/src/closable.ts
index dbdd086031..c3fb5464c6 100644
--- a/packages/service-provider-core/src/closable.ts
+++ b/packages/service-provider-core/src/closable.ts
@@ -5,4 +5,4 @@ export default interface Closable {
    * @param {boolean} force - Whether to force close.
    */
   close(boolean): Promise<void>;
-}
\ No newline at end of file
+}
diff --git a/packages/service-provider-core/src/command-options.ts b/packages/service-provider-core/src/command-options.ts
index 2e07e4ea83..7b849437cd 100644
--- a/packages/service-provider-core/src/command-options.ts
+++ b/packages/service-provider-core/src/command-options.ts
@@ -1,5 +1,5 @@
-import WriteConcern from "./write-concern";
+import WriteConcern from './write-concern';
 
 export default interface CommandOptions {
-  writeConcern?: WriteConcern
+  writeConcern?: WriteConcern;
 }
diff --git a/packages/service-provider-core/src/cursor.ts b/packages/service-provider-core/src/cursor.ts
index 035e845e2a..e047e445b6 100644
--- a/packages/service-provider-core/src/cursor.ts
+++ b/packages/service-provider-core/src/cursor.ts
@@ -1,6 +1,6 @@
 import Document from './document';
 
-interface Cursor {
+export default interface Cursor {
   /**
    * Add a cursor flag as an option to the cursor.
    *
@@ -8,7 +8,7 @@ interface Cursor {
    *
    * @returns {Cursor} The cursor.
    */
-  addOption(option: number): Cursor
+  addOption(option: number): Cursor;
 
   /**
    * Set cursor to allow partial results.
@@ -223,4 +223,3 @@ interface Cursor {
   explain(verbosity: string): Promise<any>;
 }
 
-export default Cursor;
diff --git a/packages/service-provider-core/src/database-options.ts b/packages/service-provider-core/src/database-options.ts
index 153bb2870e..4b9a01397d 100644
--- a/packages/service-provider-core/src/database-options.ts
+++ b/packages/service-provider-core/src/database-options.ts
@@ -1,9 +1,9 @@
-import WriteConcern from "./write-concern";
-import ReadConcern from "./read-concern";
-import ReadPreference from "./read-preference";
+import WriteConcern from './write-concern';
+import ReadConcern from './read-concern';
+import ReadPreference from './read-preference';
 
 export default interface DatabaseOptions extends WriteConcern {
   returnNonCachedInstance?: boolean;
   readConcern?: ReadConcern;
-  readPreference?: ReadPreference
+  readPreference?: ReadPreference;
 }
diff --git a/packages/service-provider-core/src/document.ts b/packages/service-provider-core/src/document.ts
index 74b63c4421..f82f322436 100644
--- a/packages/service-provider-core/src/document.ts
+++ b/packages/service-provider-core/src/document.ts
@@ -1,5 +1,3 @@
-interface Document {
-  [prop: string]: any
-};
-
-export default Document;
+export default interface Document {
+  [prop: string]: any;
+}
diff --git a/packages/service-provider-core/src/index.ts b/packages/service-provider-core/src/index.ts
index 38315fff55..94aa8c463b 100644
--- a/packages/service-provider-core/src/index.ts
+++ b/packages/service-provider-core/src/index.ts
@@ -10,7 +10,7 @@ import DatabaseOptions from './database-options';
 import getConnectInfo from './connect-info';
 import { ReplPlatform } from './platform';
 import CliOptions from './cli-options';
-import generateUri, { Scheme }  from './uri-generator';
+import generateUri, { Scheme } from './uri-generator';
 const DEFAULT_DB = 'test';
 
 export {
diff --git a/packages/service-provider-core/src/read-preference.ts b/packages/service-provider-core/src/read-preference.ts
index 9f7579abe6..d30b90bff8 100644
--- a/packages/service-provider-core/src/read-preference.ts
+++ b/packages/service-provider-core/src/read-preference.ts
@@ -1,4 +1,4 @@
 export default interface ReadPreference {
-  mode: string,
-  tags?: Record<string, string>[]
+  mode: string;
+  tags?: Record<string, string>[];
 }
diff --git a/packages/service-provider-core/src/readable.ts b/packages/service-provider-core/src/readable.ts
index 2c287b3af7..03c6a3e44b 100644
--- a/packages/service-provider-core/src/readable.ts
+++ b/packages/service-provider-core/src/readable.ts
@@ -6,7 +6,7 @@ import DatabaseOptions from './database-options';
 /**
  * Interface for read operations in the CRUD specification.
  */
-interface Readable {
+export default interface Readable {
   /**
    * Run an aggregation pipeline.
    *
@@ -23,7 +23,7 @@ interface Readable {
     collection: string,
     pipeline: Document[],
     options?: Document,
-    dbOptions?: DatabaseOptions) : Cursor;
+    dbOptions?: DatabaseOptions): Cursor;
 
   /**
    * Run an aggregation pipeline on the DB.
@@ -31,6 +31,7 @@ interface Readable {
    * @param {String} database - The database name.
    * @param {Array} pipeline - The aggregation pipeline.
    * @param {Document} options - The pipeline options.
+   * @param {Object} dbOptions - Optional options.
    *
    * @returns {Cursor} A cursor.
    */
@@ -39,7 +40,7 @@ interface Readable {
     pipeline: Document[],
     options?: Document,
     dbOptions?: DatabaseOptions
-  ) : Cursor;
+  ): Cursor;
 
   /**
    * Returns the count of documents that would match a find() query for the
@@ -98,7 +99,7 @@ interface Readable {
     fieldName: string,
     filter?: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Get an estimated document count from the collection.
@@ -114,7 +115,7 @@ interface Readable {
     database: string,
     collection: string,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Find documents in the collection.
@@ -132,7 +133,7 @@ interface Readable {
     collection: string,
     filter?: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Cursor;
+    dbOptions?: DatabaseOptions): Cursor;
 
   /**
    * Returns the server version.
@@ -201,7 +202,6 @@ interface Readable {
     collection: string,
     options?: Document,
     dbOptions?: DatabaseOptions
-  ): Promise<Result>
+  ): Promise<Result>;
 }
 
-export default Readable;
diff --git a/packages/service-provider-core/src/result.ts b/packages/service-provider-core/src/result.ts
index 8009cd5a5f..95c07558ce 100644
--- a/packages/service-provider-core/src/result.ts
+++ b/packages/service-provider-core/src/result.ts
@@ -1,3 +1,4 @@
+/* eslint no-undef: 0 */
 type Result = any;
 
 export default Result;
diff --git a/packages/service-provider-core/src/service-provider.ts b/packages/service-provider-core/src/service-provider.ts
index e2a4494326..cc5c0beee2 100644
--- a/packages/service-provider-core/src/service-provider.ts
+++ b/packages/service-provider-core/src/service-provider.ts
@@ -6,6 +6,4 @@ import Admin from './admin';
 /**
  * Interface for all service providers.
  */
-interface ServiceProvider extends Readable, Writable, Closable, Admin {};
-
-export default ServiceProvider;
+export default interface ServiceProvider extends Readable, Writable, Closable, Admin {}
diff --git a/packages/service-provider-core/src/writable.ts b/packages/service-provider-core/src/writable.ts
index 72e1fd57ee..8cf4f81d78 100644
--- a/packages/service-provider-core/src/writable.ts
+++ b/packages/service-provider-core/src/writable.ts
@@ -8,13 +8,14 @@ import DatabaseOptions from './database-options';
 /**
  * Interface for write operations in the CRUD specification.
  */
-interface Writable {
+export default interface Writable {
 
   /**
    * @param {String} db - the db name
    * @param spec
    * @param options
-   * @return {any}
+   * @param {DatabaseOptions} dbOptions - The database options
+   * @return {Promise<Result>}
    */
   runCommand(
     db: string,
@@ -27,7 +28,8 @@ interface Writable {
    * Drop a database
    *
    * @param {String} database - The database name.
-   * @param {WriteConcernDoc} writeConcern - The write concern.
+   * @param {WriteConcern} writeConcern - The write concern.
+   * @param {DatabaseOptions} dbOptions - The database options
    *
    * @returns {Promise<Result>} The result of the operation.
    */
@@ -35,7 +37,7 @@ interface Writable {
     database: string,
     writeConcern?: WriteConcern,
     dbOptions?: DatabaseOptions
-  ) : Promise<Result>;
+  ): Promise<Result>;
 
   /**
    * Execute a mix of write operations.
@@ -53,7 +55,7 @@ interface Writable {
     collection: string,
     requests: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<BulkWriteResult>;
+    dbOptions?: DatabaseOptions): Promise<BulkWriteResult>;
 
   /**
    * Delete multiple documents from the collection.
@@ -71,7 +73,7 @@ interface Writable {
     collection: string,
     filter: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Delete one document from the collection.
@@ -89,7 +91,7 @@ interface Writable {
     collection: string,
     filter: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Find one document and delete it.
@@ -107,7 +109,7 @@ interface Writable {
     collection: string,
     filter: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Find one document and replace it.
@@ -127,7 +129,7 @@ interface Writable {
     filter: Document,
     replacement: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Find one document and update it.
@@ -147,7 +149,7 @@ interface Writable {
     filter: Document,
     update: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Insert many documents into the colleciton.
@@ -165,7 +167,7 @@ interface Writable {
     collection: string,
     docs: Document[],
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Insert one document into the collection.
@@ -183,7 +185,7 @@ interface Writable {
     collection: string,
     doc: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Replace a document with another.
@@ -203,7 +205,7 @@ interface Writable {
     filter: Document,
     replacement: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Update many document.
@@ -223,7 +225,7 @@ interface Writable {
     filter: Document,
     update: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * find and update or remove a document.
@@ -246,7 +248,7 @@ interface Writable {
     update: Document,
     options?: Document,
     dbOptions?: DatabaseOptions
-  )
+  );
 
   /**
    * Update a document.
@@ -266,7 +268,7 @@ interface Writable {
     filter: Document,
     update: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions) : Promise<Result>;
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Deprecated save command.
@@ -283,7 +285,7 @@ interface Writable {
     collection: string,
     doc: Document,
     options?: Document,
-    dbOptions?: DatabaseOptions): Promise<Result>
+    dbOptions?: DatabaseOptions): Promise<Result>;
 
   /**
    * Deprecated remove command.
@@ -310,7 +312,7 @@ interface Writable {
    * @param {String} database - The db name.
    * @param {String} collection - The collection name.
    * @param {String} size - The maximum size, in bytes, for the capped collection.
-   * @param {CommandOptions} commandOptions - The command options
+   * @param {CommandOptions} options - The command options
    *
    * @return {Promise}
    */
@@ -318,7 +320,7 @@ interface Writable {
     database: string,
     collection: string,
     size: number,
-    options?: CommandOptions): Promise<Result>
+    options?: CommandOptions): Promise<Result>;
 
   /**
    * Adds new indexes to a collection.
@@ -344,6 +346,7 @@ interface Writable {
    * @param {String} collection - The collection name.
    * @param {string|string[]|Object|Object[]} indexes the indexes to be removed.
    * @param {CommandOptions} commandOptions - The command options.
+   * @param {DatabaseOptions} dbOptions - The database options
    * @return {Promise}
    */
   dropIndexes(
@@ -359,6 +362,7 @@ interface Writable {
    * @param {String} database - The db name.
    * @param {String} collection - The collection name.
    * @param {CommandOptions} options - The command options.
+   * @param {DatabaseOptions} dbOptions - The database options
    * @return {Promise}
    */
   reIndex(
@@ -388,6 +392,7 @@ interface Writable {
    * @param {String} oldName - The collection name.
    * @param {String} newName - The new collection name.
    * @param {String} options - The options.
+   * @param {DatabaseOptions} dbOptions - The database options
    */
   renameCollection(
     database: string,
@@ -397,4 +402,3 @@ interface Writable {
     dbOptions?: DatabaseOptions): Promise<Result>;
 }
 
-export default Writable;
diff --git a/packages/shell-api/src/shell-bson.ts b/packages/shell-api/src/shell-bson.ts
index 4c8c1b3b67..b32d142ace 100644
--- a/packages/shell-api/src/shell-bson.ts
+++ b/packages/shell-api/src/shell-bson.ts
@@ -13,26 +13,26 @@ function dateHelper(...args: DateConstructorArguments): Date {
 }
 export default {
   RegExp: RegExp,
-  DBRef: function(...args) {
+  DBRef: function(...args): bson.DBRef {
     return new bson.DBRef(...args);
   },
-  DBPointer: function(...args) {
+  DBPointer: function(...args): bson.DBPointer {
     return new bson.DBPointer(...args);
   },
   Map: bson.Map,
-  MaxKey: function(...args) {
+  MaxKey: function(...args): bson.MaxKey {
     return new bson.MaxKey(...args);
   },
-  MinKey: function(...args) {
+  MinKey: function(...args): bson.MinKey {
     return new bson.MinKey(...args);
   },
-  ObjectId: function(...args) {
+  ObjectId: function(...args): bson.ObjectID {
     return new bson.ObjectID(...args);
   },
-  Symbol: function(...args) {
+  Symbol: function(...args): bson.Symbol {
     return new bson.BSONSymbol(...args);
   },
-  Timestamp: function(...args) {
+  Timestamp: function(...args): bson.Timestamp {
     return new bson.Timestamp(...args);
   },
   Code: function(c, s): bson.Code {
diff --git a/packages/shell-evaluator/src/shell-evaluator.spec.ts b/packages/shell-evaluator/src/shell-evaluator.spec.ts
index 6de348f97d..d2d68776de 100644
--- a/packages/shell-evaluator/src/shell-evaluator.spec.ts
+++ b/packages/shell-evaluator/src/shell-evaluator.spec.ts
@@ -19,7 +19,7 @@ describe('ShellEvaluator', () => {
       messageBus: busMock,
       shellApi: { use: useSpy },
       asyncWriter: {
-        process: i => (i),
+        process: (i): string => (i),
         symbols: {
           saveState: sinon.spy(), revertState: sinon.spy()
         }