diff --git a/src/cache.ts b/src/cache.ts
index 07765e3e9a..6491a55ac0 100644
--- a/src/cache.ts
+++ b/src/cache.ts
@@ -33,14 +33,14 @@ export class ListWatch<T extends KubernetesObject> implements ObjectCache<T>, In
         await this.doneHandler(null);
     }
 
-    public on(verb: string, cb: ObjectCallback<T>) {
+    public on(verb: string, cb: ObjectCallback<T>): void {
         if (this.callbackCache[verb] === undefined) {
             throw new Error(`Unknown verb: ${verb}`);
         }
         this.callbackCache[verb].push(cb);
     }
 
-    public off(verb: string, cb: ObjectCallback<T>) {
+    public off(verb: string, cb: ObjectCallback<T>): void {
         if (this.callbackCache[verb] === undefined) {
             throw new Error(`Unknown verb: ${verb}`);
         }
@@ -72,7 +72,7 @@ export class ListWatch<T extends KubernetesObject> implements ObjectCache<T>, In
         return this.resourceVersion;
     }
 
-    private async doneHandler(err: any) {
+    private async doneHandler(err: any): Promise<any> {
         if (err) {
             this.callbackCache[ERROR].forEach((elt: ObjectCallback<T>) => elt(err));
             return;
@@ -93,7 +93,7 @@ export class ListWatch<T extends KubernetesObject> implements ObjectCache<T>, In
         );
     }
 
-    private addOrUpdateItems(items: T[]) {
+    private addOrUpdateItems(items: T[]): void {
         items.forEach((obj: T) => {
             addOrUpdateObject(
                 this.objects,
@@ -107,7 +107,7 @@ export class ListWatch<T extends KubernetesObject> implements ObjectCache<T>, In
         });
     }
 
-    private indexObj(obj: T) {
+    private indexObj(obj: T): void {
         let namespaceList = this.indexCache[obj.metadata!.namespace!] as T[];
         if (!namespaceList) {
             namespaceList = [];
@@ -116,7 +116,7 @@ export class ListWatch<T extends KubernetesObject> implements ObjectCache<T>, In
         addOrUpdateObject(namespaceList, obj);
     }
 
-    private watchHandler(phase: string, obj: T, watchObj?: any) {
+    private watchHandler(phase: string, obj: T, watchObj?: any): void {
         switch (phase) {
             case 'ADDED':
             case 'MODIFIED':
@@ -172,7 +172,7 @@ export function addOrUpdateObject<T extends KubernetesObject>(
     obj: T,
     addCallback?: Array<ObjectCallback<T>>,
     updateCallback?: Array<ObjectCallback<T>>,
-) {
+): void {
     const ix = findKubernetesObject(objects, obj);
     if (ix === -1) {
         objects.push(obj);
@@ -202,7 +202,7 @@ export function deleteObject<T extends KubernetesObject>(
     objects: T[],
     obj: T,
     deleteCallback?: Array<ObjectCallback<T>>,
-) {
+): void {
     const ix = findKubernetesObject(objects, obj);
     if (ix !== -1) {
         objects.splice(ix, 1);
diff --git a/src/cloud_auth.ts b/src/cloud_auth.ts
index bc175f1ade..5fb36abe83 100644
--- a/src/cloud_auth.ts
+++ b/src/cloud_auth.ts
@@ -26,7 +26,10 @@ export class CloudAuth implements Authenticator {
         return user.authProvider.name === 'azure' || user.authProvider.name === 'gcp';
     }
 
-    public async applyAuthentication(user: User, opts: request.Options | https.RequestOptions) {
+    public async applyAuthentication(
+        user: User,
+        opts: request.Options | https.RequestOptions,
+    ): Promise<void> {
         const token = this.getToken(user);
         if (token) {
             opts.headers!.Authorization = `Bearer ${token}`;
@@ -41,7 +44,7 @@ export class CloudAuth implements Authenticator {
         return config['access-token'];
     }
 
-    private isExpired(config: Config) {
+    private isExpired(config: Config): boolean {
         const token = config['access-token'];
         const expiry = config.expiry;
         if (!token) {
@@ -58,7 +61,7 @@ export class CloudAuth implements Authenticator {
         return false;
     }
 
-    private updateAccessToken(config: Config) {
+    private updateAccessToken(config: Config): void {
         let cmd = config['cmd-path'];
         if (!cmd) {
             throw new Error('Token is expired!');
diff --git a/src/config.ts b/src/config.ts
index 868a23b332..01a3572a44 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -71,27 +71,27 @@ export class KubeConfig {
         this.users = [];
     }
 
-    public getContexts() {
+    public getContexts(): Context[] {
         return this.contexts;
     }
 
-    public getClusters() {
+    public getClusters(): Cluster[] {
         return this.clusters;
     }
 
-    public getUsers() {
+    public getUsers(): User[] {
         return this.users;
     }
 
-    public getCurrentContext() {
+    public getCurrentContext(): string {
         return this.currentContext;
     }
 
-    public setCurrentContext(context: string) {
+    public setCurrentContext(context: string): void {
         this.currentContext = context;
     }
 
-    public getContextObject(name: string) {
+    public getContextObject(name: string): Context | null {
         if (!this.contexts) {
             return null;
         }
@@ -122,13 +122,13 @@ export class KubeConfig {
         return findObject(this.users, name, 'user');
     }
 
-    public loadFromFile(file: string, opts?: Partial<ConfigOptions>) {
+    public loadFromFile(file: string, opts?: Partial<ConfigOptions>): void {
         const rootDirectory = path.dirname(file);
         this.loadFromString(fs.readFileSync(file, 'utf8'), opts);
         this.makePathsAbsolute(rootDirectory);
     }
 
-    public async applytoHTTPSOptions(opts: https.RequestOptions) {
+    public async applytoHTTPSOptions(opts: https.RequestOptions): Promise<void> {
         const user = this.getCurrentUser();
 
         await this.applyOptions(opts);
@@ -138,7 +138,7 @@ export class KubeConfig {
         }
     }
 
-    public async applyToRequest(opts: request.Options) {
+    public async applyToRequest(opts: request.Options): Promise<void> {
         const cluster = this.getCurrentCluster();
         const user = this.getCurrentUser();
 
@@ -156,7 +156,7 @@ export class KubeConfig {
         }
     }
 
-    public loadFromString(config: string, opts?: Partial<ConfigOptions>) {
+    public loadFromString(config: string, opts?: Partial<ConfigOptions>): void {
         const obj = yaml.safeLoad(config);
         this.clusters = newClusters(obj.clusters, opts);
         this.contexts = newContexts(obj.contexts, opts);
@@ -164,14 +164,14 @@ export class KubeConfig {
         this.currentContext = obj['current-context'];
     }
 
-    public loadFromOptions(options: any) {
+    public loadFromOptions(options: any): void {
         this.clusters = options.clusters;
         this.contexts = options.contexts;
         this.users = options.users;
         this.currentContext = options.currentContext;
     }
 
-    public loadFromClusterAndUser(cluster: Cluster, user: User) {
+    public loadFromClusterAndUser(cluster: Cluster, user: User): void {
         this.clusters = [cluster];
         this.users = [user];
         this.currentContext = 'loaded-context';
@@ -184,7 +184,7 @@ export class KubeConfig {
         ];
     }
 
-    public loadFromCluster(pathPrefix: string = '') {
+    public loadFromCluster(pathPrefix: string = ''): void {
         const host = process.env.KUBERNETES_SERVICE_HOST;
         const port = process.env.KUBERNETES_SERVICE_PORT;
         const clusterName = 'inCluster';
@@ -231,7 +231,7 @@ export class KubeConfig {
         this.currentContext = contextName;
     }
 
-    public mergeConfig(config: KubeConfig) {
+    public mergeConfig(config: KubeConfig): void {
         this.currentContext = config.currentContext;
         config.clusters.forEach((cluster: Cluster) => {
             this.addCluster(cluster);
@@ -244,7 +244,7 @@ export class KubeConfig {
         });
     }
 
-    public addCluster(cluster: Cluster) {
+    public addCluster(cluster: Cluster): void {
         if (!this.clusters) {
             this.clusters = [];
         }
@@ -256,7 +256,7 @@ export class KubeConfig {
         this.clusters.push(cluster);
     }
 
-    public addUser(user: User) {
+    public addUser(user: User): void {
         if (!this.users) {
             this.users = [];
         }
@@ -268,7 +268,7 @@ export class KubeConfig {
         this.users.push(user);
     }
 
-    public addContext(ctx: Context) {
+    public addContext(ctx: Context): void {
         if (!this.contexts) {
             this.contexts = [];
         }
@@ -280,7 +280,7 @@ export class KubeConfig {
         this.contexts.push(ctx);
     }
 
-    public loadFromDefault(opts?: Partial<ConfigOptions>) {
+    public loadFromDefault(opts?: Partial<ConfigOptions>): void {
         if (process.env.KUBECONFIG && process.env.KUBECONFIG.length > 0) {
             const files = process.env.KUBECONFIG.split(path.delimiter);
             this.loadFromFile(files[0], opts);
@@ -323,7 +323,7 @@ export class KubeConfig {
         );
     }
 
-    public makeApiClient<T extends ApiType>(apiClientType: ApiConstructor<T>) {
+    public makeApiClient<T extends ApiType>(apiClientType: ApiConstructor<T>): T {
         const cluster = this.getCurrentCluster();
         if (!cluster) {
             throw new Error('No active cluster!');
@@ -334,7 +334,7 @@ export class KubeConfig {
         return apiClient;
     }
 
-    public makePathsAbsolute(rootDirectory: string) {
+    public makePathsAbsolute(rootDirectory: string): void {
         this.clusters.forEach((cluster: Cluster) => {
             if (cluster.caFile) {
                 cluster.caFile = makeAbsolutePath(rootDirectory, cluster.caFile);
@@ -364,11 +364,11 @@ export class KubeConfig {
         return JSON.stringify(configObj);
     }
 
-    private getCurrentContextObject() {
+    private getCurrentContextObject(): Context | null {
         return this.getContextObject(this.currentContext);
     }
 
-    private applyHTTPSOptions(opts: request.Options | https.RequestOptions) {
+    private applyHTTPSOptions(opts: request.Options | https.RequestOptions): void {
         const cluster = this.getCurrentCluster();
         const user = this.getCurrentUser();
         if (!user) {
@@ -392,7 +392,7 @@ export class KubeConfig {
         }
     }
 
-    private async applyAuthorizationHeader(opts: request.Options | https.RequestOptions) {
+    private async applyAuthorizationHeader(opts: request.Options | https.RequestOptions): Promise<void> {
         const user = this.getCurrentUser();
         if (!user) {
             return;
@@ -413,7 +413,7 @@ export class KubeConfig {
         }
     }
 
-    private async applyOptions(opts: request.Options | https.RequestOptions) {
+    private async applyOptions(opts: request.Options | https.RequestOptions): Promise<void> {
         this.applyHTTPSOptions(opts);
         await this.applyAuthorizationHeader(opts);
     }
@@ -428,9 +428,9 @@ type ApiConstructor<T extends ApiType> = new (server: string) => T;
 
 // This class is deprecated and will eventually be removed.
 export class Config {
-    public static SERVICEACCOUNT_ROOT = '/var/run/secrets/kubernetes.io/serviceaccount';
-    public static SERVICEACCOUNT_CA_PATH = Config.SERVICEACCOUNT_ROOT + '/ca.crt';
-    public static SERVICEACCOUNT_TOKEN_PATH = Config.SERVICEACCOUNT_ROOT + '/token';
+    public static SERVICEACCOUNT_ROOT: string = '/var/run/secrets/kubernetes.io/serviceaccount';
+    public static SERVICEACCOUNT_CA_PATH: string = Config.SERVICEACCOUNT_ROOT + '/ca.crt';
+    public static SERVICEACCOUNT_TOKEN_PATH: string = Config.SERVICEACCOUNT_ROOT + '/token';
 
     public static fromFile(filename: string): api.CoreV1Api {
         return Config.apiFromFile(filename, api.CoreV1Api);
diff --git a/src/exec_auth.ts b/src/exec_auth.ts
index 054818ce47..c61531de52 100644
--- a/src/exec_auth.ts
+++ b/src/exec_auth.ts
@@ -36,7 +36,10 @@ export class ExecAuth implements Authenticator {
         );
     }
 
-    public async applyAuthentication(user: User, opts: request.Options | https.RequestOptions) {
+    public async applyAuthentication(
+        user: User,
+        opts: request.Options | https.RequestOptions,
+    ): Promise<void> {
         const credential = this.getCredential(user);
         if (!credential) {
             return;
diff --git a/src/file_auth.ts b/src/file_auth.ts
index 3fc5cd2a4c..a1380cbb82 100644
--- a/src/file_auth.ts
+++ b/src/file_auth.ts
@@ -13,7 +13,10 @@ export class FileAuth implements Authenticator {
         return user.authProvider && user.authProvider.config && user.authProvider.config.tokenFile;
     }
 
-    public async applyAuthentication(user: User, opts: request.Options | https.RequestOptions) {
+    public async applyAuthentication(
+        user: User,
+        opts: request.Options | https.RequestOptions,
+    ): Promise<void> {
         if (this.token == null) {
             this.refreshToken(user.authProvider.config.tokenFile);
         }
@@ -25,7 +28,7 @@ export class FileAuth implements Authenticator {
         }
     }
 
-    private refreshToken(filePath: string) {
+    private refreshToken(filePath: string): void {
         // TODO make this async?
         this.token = fs.readFileSync(filePath).toString('UTF-8');
         this.lastRead = new Date();
diff --git a/src/informer.ts b/src/informer.ts
index dd8949cefe..1bd0f34631 100644
--- a/src/informer.ts
+++ b/src/informer.ts
@@ -18,8 +18,8 @@ export const DELETE: string = 'delete';
 export const ERROR: string = 'error';
 
 export interface Informer<T> {
-    on(verb: string, fn: ObjectCallback<T>);
-    off(verb: string, fn: ObjectCallback<T>);
+    on(verb: string, fn: ObjectCallback<T>): void;
+    off(verb: string, fn: ObjectCallback<T>): void;
     start(): Promise<void>;
 }
 
diff --git a/src/oidc_auth.ts b/src/oidc_auth.ts
index 379a67a109..dfe39011a4 100644
--- a/src/oidc_auth.ts
+++ b/src/oidc_auth.ts
@@ -40,7 +40,7 @@ export class OpenIDConnectAuth implements Authenticator {
     }
 
     // public for testing purposes.
-    private currentTokenExpiration = 0;
+    private currentTokenExpiration: number = 0;
     public isAuthProvider(user: User): boolean {
         if (!user.authProvider) {
             return false;
@@ -58,7 +58,7 @@ export class OpenIDConnectAuth implements Authenticator {
         user: User,
         opts: request.Options | https.RequestOptions,
         overrideClient?: any,
-    ) {
+    ): Promise<void> {
         const token = await this.getToken(user, overrideClient);
         if (token) {
             opts.headers!.Authorization = `Bearer ${token}`;
@@ -102,7 +102,7 @@ export class OpenIDConnectAuth implements Authenticator {
         return user.authProvider.config['id-token'];
     }
 
-    private async getClient(user: User) {
+    private async getClient(user: User): Promise<Client> {
         const oidcIssuer = await Issuer.discover(user.authProvider.config['idp-issuer-url']);
         return new oidcIssuer.Client({
             client_id: user.authProvider.config['client-id'],
diff --git a/src/terminal-size-queue.ts b/src/terminal-size-queue.ts
index b461f8f0ff..c6c6cdee5a 100644
--- a/src/terminal-size-queue.ts
+++ b/src/terminal-size-queue.ts
@@ -3,7 +3,7 @@ import { Readable, ReadableOptions } from 'stream';
 export interface ResizableStream {
     columns: number;
     rows: number;
-    on(event: 'resize', cb: () => void);
+    on(event: 'resize', cb: () => void): void;
 }
 
 export interface TerminalSize {
@@ -16,11 +16,11 @@ export class TerminalSizeQueue extends Readable {
         super({
             ...opts,
             // tslint:disable-next-line:no-empty
-            read() {},
+            read(): void {},
         });
     }
 
-    public handleResizes(writeStream: ResizableStream) {
+    public handleResizes(writeStream: ResizableStream): void {
         // Set initial size
         this.resize(getTerminalSize(writeStream));
 
@@ -28,12 +28,12 @@ export class TerminalSizeQueue extends Readable {
         writeStream.on('resize', () => this.resize(getTerminalSize(writeStream)));
     }
 
-    private resize(size: TerminalSize) {
+    private resize(size: TerminalSize): void {
         this.push(JSON.stringify(size));
     }
 }
 
-export function isResizable(stream: any) {
+export function isResizable(stream: any): boolean {
     if (stream == null) {
         return false;
     }
diff --git a/src/watch.ts b/src/watch.ts
index 9593c056d1..5a98bb76f0 100644
--- a/src/watch.ts
+++ b/src/watch.ts
@@ -7,18 +7,29 @@ export interface WatchUpdate {
     object: object;
 }
 
+export interface Response {
+    statusCode: number;
+    statusMessage: string;
+}
+
 export interface RequestInterface {
-    webRequest(opts: request.Options, callback: (err, response, body) => void): any;
+    webRequest(
+        opts: request.Options,
+        callback: (err: object | null, response: Response | null, body: object | null) => void,
+    ): any;
 }
 
 export class DefaultRequest implements RequestInterface {
-    public webRequest(opts: request.Options, callback: (err, response, body) => void): any {
+    public webRequest(
+        opts: request.Options,
+        callback: (err: object | null, response: Response | null, body: object | null) => void,
+    ): any {
         return request(opts, callback);
     }
 }
 
 export class Watch {
-    public static SERVER_SIDE_CLOSE = { error: 'Connection closed on server' };
+    public static SERVER_SIDE_CLOSE: object = { error: 'Connection closed on server' };
     public config: KubeConfig;
     private readonly requestImpl: RequestInterface;
 
diff --git a/src/web-socket-handler.ts b/src/web-socket-handler.ts
index b6387c2dd9..416369bbf8 100644
--- a/src/web-socket-handler.ts
+++ b/src/web-socket-handler.ts
@@ -15,11 +15,11 @@ export interface WebSocketInterface {
 }
 
 export class WebSocketHandler implements WebSocketInterface {
-    public static readonly StdinStream = 0;
-    public static readonly StdoutStream = 1;
-    public static readonly StderrStream = 2;
-    public static readonly StatusStream = 3;
-    public static readonly ResizeStream = 4;
+    public static readonly StdinStream: number = 0;
+    public static readonly StdoutStream: number = 1;
+    public static readonly StderrStream: number = 2;
+    public static readonly StatusStream: number = 3;
+    public static readonly ResizeStream: number = 4;
 
     public static handleStandardStreams(
         streamNum: number,
diff --git a/tslint.json b/tslint.json
index d9524eed15..bfdc3a013e 100644
--- a/tslint.json
+++ b/tslint.json
@@ -14,7 +14,8 @@
     "interface-name": [true, "never-prefix"],
     "object-literal-sort-keys": false,
     "object-literal-key-quotes": [true, "as-needed"],
-    "max-classes-per-file": false
+    "max-classes-per-file": false,
+    "typedef": [true, "call-signature", "parameter", "member-variable-declaration"]
   },
   "rulesDirectory": []
 }