vscode - sample launch config + preLaunchTask with watch

gistfile1.txt

// launch.json
{
  "type": "node",
  "request": "launch",
  "name": "Server build and debug",
  "useWSL": true,
  "program": "${workspaceFolder}/server/js/src/app.ts",
  "cwd": "${workspaceFolder}/server",
  "preLaunchTask": "npm-buildserver",
  "outFiles": [
    "${workspaceFolder}/server/js/build/**/*.js"
  ]
}

// tasks.json
{
  "label": "npm-buildserver",
  "isBackground": true,
  "type": "npm",
  "script": "buildserver",
  "problemMatcher": [
    "$tsc-watch"
  ]
}

// package.json
{
  "buildserver": "./node_modules/.bin/tsc -w -p ./server/js"
}