tstoggle

"commands": [
  {
    "command": "extension.tstoggletojs",
    "title": "switch to js"
  },
  {
    "command": "extension.jstoggletots",
    "title": "switch to ts"
  }
],
"keybindings": [
  {
    "command": "extension.keyswitch",
    "key": "alt+o",
    "when": "editorTextFocus"
  }
],