官方文档配置如下

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "chrome",
      "request": "launch",
      "name": "vuejs: chrome",
      "url": "http://localhost:8080",
      "webRoot": "${workspaceFolder}/src",
      "breakOnLoad": true,
      "sourceMapPathOverrides": {
        "webpack:///src/*": "${webRoot}/*"
      }
    },
    {
      "type": "firefox",
      "request": "launch",
      "name": "vuejs: firefox",
      "url": "http://localhost:8080",
      "webRoot": "${workspaceFolder}/src",
      "pathMappings": [{ "url": "webpack:///src/", "path": "${webRoot}/" }]
    }
  ]
}

因为vscode版本升级，上面配置打断点后是灰色的不能调试，把配置改为如下

{
    // 使用 IntelliSense 了解相关属性。 
    // 悬停以查看现有属性的描述。
    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "type": "pwa-chrome",
            "request": "launch",
            "name": "Launch Chrome against localhost",
            "url": "http://localhost:8080",
            "webRoot": "${workspaceFolder}"
        }
    ]
}

另外用chrom dev版，vscode F5运行不能自动打开chrome

Debugging in VS Code