如何 debug 源码

vscode debug -> create a launch.json file -> node -> launch via npm

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Launch via NPM",
      "request": "launch",
      "runtimeArgs": ["run-script", "build"],
      "runtimeExecutable": "npm",
      "skipFiles": ["<node_internals>/**"],
      "type": "node"
    }
  ]
}

再去bin目录下的 react-scripts 去加debugger