Add more TS lints (#6084)

* Fix to not call onMouseLeave with no selected object

* Add no this alias lint

* Add more lints and fix JSON formatting

* Fix to use lower-case string type

* Add another namespace lint

* Fix to not use plus on possibly non-string values

src/preload.ts

@@ -11,7 +11,7 @@ import type { WebContentSendPayload } from './menu/channels'
 
 const typeSafeIpcRendererOn = (
   channel: Channel,
-  listener: (event: IpcRendererEvent, ...args: any[]) => Promise<void> | any
+  listener: (event: IpcRendererEvent, ...args: any[]) => void
 ) => ipcRenderer.on(channel, listener)
 
 const resizeWindow = (width: number, height: number) =>
@@ -163,7 +163,7 @@ const listMachines = async (
   })
 }
 
-const getMachineApiIp = async (): Promise<String | null> =>
+const getMachineApiIp = async (): Promise<string | null> =>
   ipcRenderer.invoke('find_machine_api')
 
 const getArgvParsed = () => {