message: chore(express): minor clean up in errors.ts
diff: +/**
  + * @prettier
  + */
  // Descriptive error types for common issues which may arise
  // during the operation of BitGoJS or BitGoExpress
  import { Errors } from 'bitgo';
  export class TlsConfigurationError extends Errors.BitGoJsError {
  - public constructor(message?) {
  + public constructor(message?: string) {
  super(message || 'TLS is configuration is invalid');
  Object.setPrototypeOf(this, TlsConfigurationError.prototype);
  }
  }
  export class NodeEnvironmentError extends Errors.BitGoJsError {
  - public constructor(message?) {
  + public constructor(message?: string) {
  super(message || 'NODE_ENV is invalid for the current bitgo environment');
  Object.setPrototypeOf(this, NodeEnvironmentError.prototype);
  }
  @@ -22,8 +25,8 @@ export class NodeEnvironmentError extends Errors.BitGoJsError {
  export class ApiResponseError extends Errors.BitGoJsError {
  public readonly status: number;
  - public readonly result: any;
  - public constructor(message: string | undefined, status: number, result?: any) {
  + public readonly result: unknown;
  + public constructor(message: string | undefined, status: number, result?: unknown) {
  super(message);
  Object.setPrototypeOf(this, ApiResponseError.prototype);
  this.status = status;
  