tasks.json

{
  "version": "2.0.0",
  "tasks": [
    {
      "label": "TypeScript: Watch",
      "type": "shell",
      "command": "npx tsc --noEmit --watch",
      "options": {
        "cwd": "${workspaceFolder}/api"
      },
      "isBackground": true,
      "problemMatcher": {
        "base": "$tsc-watch",
        "fileLocation": [
          "relative",
          "${workspaceFolder}/api"
        ]
      },
      "group": {
        "kind": "build",
        "isDefault": true
      },
      "presentation": {
        "reveal": "never",
        "panel": "shared",
        "clear": true
      },
      "runOptions": {
        "runOn": "folderOpen"
      }
    }
  ]
}