clean up code in cli/js (#6611)

cli/js/errors.ts

@@ -26,7 +26,11 @@ export enum ErrorKind {
   Busy = 23,
 }
 
-export function getErrorClass(kind: ErrorKind): { new (msg: string): Error } {
+interface ErrorClass {
+  new (msg: string): Error;
+}
+
+export function getErrorClass(kind: ErrorKind): ErrorClass {
   switch (kind) {
     case ErrorKind.TypeError:
       return TypeError;
@@ -79,102 +83,119 @@ class NotFound extends Error {
     this.name = "NotFound";
   }
 }
+
 class PermissionDenied extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "PermissionDenied";
   }
 }
+
 class ConnectionRefused extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "ConnectionRefused";
   }
 }
+
 class ConnectionReset extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "ConnectionReset";
   }
 }
+
 class ConnectionAborted extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "ConnectionAborted";
   }
 }
+
 class NotConnected extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "NotConnected";
   }
 }
+
 class AddrInUse extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "AddrInUse";
   }
 }
+
 class AddrNotAvailable extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "AddrNotAvailable";
   }
 }
+
 class BrokenPipe extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "BrokenPipe";
   }
 }
+
 class AlreadyExists extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "AlreadyExists";
   }
 }
+
 class InvalidData extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "InvalidData";
   }
 }
+
 class TimedOut extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "TimedOut";
   }
 }
+
 class Interrupted extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "Interrupted";
   }
 }
+
 class WriteZero extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "WriteZero";
   }
 }
+
 class UnexpectedEof extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "UnexpectedEof";
   }
 }
+
 class BadResource extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "BadResource";
   }
 }
+
 class Http extends Error {
   constructor(msg: string) {
     super(msg);
     this.name = "Http";
   }
 }
+
 class Busy extends Error {
   constructor(msg: string) {
     super(msg);
@@ -183,22 +204,22 @@ class Busy extends Error {
 }
 
 export const errors = {
-  NotFound: NotFound,
-  PermissionDenied: PermissionDenied,
-  ConnectionRefused: ConnectionRefused,
-  ConnectionReset: ConnectionReset,
-  ConnectionAborted: ConnectionAborted,
-  NotConnected: NotConnected,
-  AddrInUse: AddrInUse,
-  AddrNotAvailable: AddrNotAvailable,
-  BrokenPipe: BrokenPipe,
-  AlreadyExists: AlreadyExists,
-  InvalidData: InvalidData,
-  TimedOut: TimedOut,
-  Interrupted: Interrupted,
-  WriteZero: WriteZero,
-  UnexpectedEof: UnexpectedEof,
-  BadResource: BadResource,
-  Http: Http,
-  Busy: Busy,
+  NotFound,
+  PermissionDenied,
+  ConnectionRefused,
+  ConnectionReset,
+  ConnectionAborted,
+  NotConnected,
+  AddrInUse,
+  AddrNotAvailable,
+  BrokenPipe,
+  AlreadyExists,
+  InvalidData,
+  TimedOut,
+  Interrupted,
+  WriteZero,
+  UnexpectedEof,
+  BadResource,
+  Http,
+  Busy,
 };