Update dependencies & fix misc formatting errors

src/util/support/data.ts

@@ -45,7 +45,7 @@ export function deepCopy<T>(target: T): T {
         return copy.map((item: any) => deepCopy<any>(item)) as any
     }
 
-    if ( typeof target === 'object' && target !== {} ) {
+    if ( typeof target === 'object' ) {
         const copy = { ...(target as {[key: string]: any }) } as { [key: string]: any }
         Object.keys(copy).forEach(key => {
             copy[key] = deepCopy<any>(copy[key])

src/util/support/path/SSHFilesystem.ts

@@ -5,6 +5,7 @@ import * as fs from 'fs'
 import {Readable, Writable} from 'stream'
 import {Collection} from '../../collection/Collection'
 import {UniversalPath} from '../path'
+import {Maybe} from '../types'
 
 /**
  * A Filesystem implementation that stores files on remote hosts via SFTP/SSH.
@@ -190,7 +191,7 @@ export class SSHFilesystem extends Filesystem {
         const sftp = await this.getSFTP()
         const metaPath = this.metadataPath(storePath)
         await new Promise<void>((res, rej) => {
-            sftp.writeFile(metaPath, JSON.stringify(meta), err => {
+            sftp.writeFile(metaPath, JSON.stringify(meta), (err: Maybe<Error>) => {
                 if ( err ) {
                     rej(err)
                 } else {