tasks.json

{
    "version": "2.0.0",
    "tasks": [
      {
        "type": "npm",
        "script": "build:dev",
        "isBackground": true,
        "presentation": {
          "focus": true,
          "panel": "dedicated"
        },
        "group": {
          "kind": "build",
          "isDefault": true
        },
        "problemMatcher": {
          "owner": "typescript",
          "source": "ts",
          "applyTo": "closedDocuments",
          "fileLocation": [
            "relative",
            "${cwd}"
          ],
          "pattern": "$tsc",
          "background": {
            "activeOnStart": true,
            "beginsPattern": {
              "regexp": "(.*?)"
            },
            "endsPattern": {
              "regexp": "Compiled |Failed to compile."
            }
          }
        }
      },
    ]
  }