json - How to use VS Code debugger with webpack-dev-server (breakpoints ignored)

Question

My problem is simple.

I just want to make VS Code's debugger work with webpack-dev-server without ignoring my breakpoints.

Now, webpack-dev-server serves the bundled files from memory, while, if I understand this correctly, the VS Code debugger searches for them on disk (...or not?...)

As a result, whenever I set a breakpoint I get the dreaded

Breakpoint ignored because generated code not found (source map problem?)

Now, every related question I could find had to do with typescript mostly, and not with the fact that webpack-dev-server serves from memory. I am not using typescript. Seems that people are either not using webpack-dev-server, or I am missing something blatantly obvious, with my money on the latter.

This is my VS Code launch.json

{
  // 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": [
    {
      "type": "chrome",
      "request": "launch",
      "name": "Launch Chrome against localhost",
      "url": "http://localhost:8080",
      "webRoot": "${workspaceRoot}",
      "sourceMaps": true,
      "trace": true
    }
  ]
}

and these are the related lines from my webpack.config.js

  devtool: 'cheap-module-source-map',
  output: {
    path: path.join(__dirname, 'dist'),
    filename: '[name].[chunkhash].js'
  },

I have tried various modifications to the launch.json to no avail, so I am just pasting it in vanilla form.

Note that the output.path is only used when there is a production build and the files are spewed to disk.

Here is what the structure of the files is in the served page:

And here is the command I am running in development

  "scripts": {
    "start": "webpack-dev-server --host 0.0.0.0 --config ./webpack.config.js"
  },

Finally, here is a relevant chunk from the trace file

From target: {"method":"Debugger.scriptParsed","params":{"scriptId":"30","url":"http://localhost:8080/manifest.0ec68ebd5f0abf9b4cd4.js","startLine":0,"startColumn":0,"endLine":150,"endColumn":57,"executionContextId":2,"hash":"216099518F33D6091EC12795265804FB35669A30","executionContextAuxData":{"isDefault":true,"frameId":"18228.1"},"isLiveEdit":false,"sourceMapURL":"manifest.0ec68ebd5f0abf9b4cd4.js.map","hasSourceURL":false,"isModule":false,"length":5906}}
Paths.scriptParsed: could not resolve http://localhost:8080/manifest.0ec68ebd5f0abf9b4cd4.js to a file under webRoot: e:MitchWorkspaceProjectsproject-name. It may be external or served directly from the server's memory (and that's OK).
SourceMaps.getMapForGeneratedPath: Finding SourceMap for http://localhost:8080/manifest.0ec68ebd5f0abf9b4cd4.js by URI: manifest.0ec68ebd5f0abf9b4cd4.js.map and webRoot: e:MitchWorkspaceProjectsproject-name
SourceMaps.loadSourceMapContents: Downloading sourcemap file from http://localhost:8080/manifest.0ec68ebd5f0abf9b4cd4.js.map
To client: {"seq":0,"type":"event","event":"script","body":{"reason":"new","script":{"id":1,"source":{"name":"manifest.0ec68ebd5f0abf9b4cd4.js","path":"http://localhost:8080/manifest.0ec68ebd5f0abf9b4cd4.js","sourceReference":1001}}}}
To client: {"seq":0,"type":"event","event":"scriptLoaded","body":{"path":"http://localhost:8080/manifest.0ec68ebd5f0abf9b4cd4.js"}}
SourceMap: creating for http://localhost:8080/manifest.0ec68ebd5f0abf9b4cd4.js
SourceMap: sourceRoot: 
SourceMap: sources: ["webpack:///webpack/bootstrap 7617f9bf7c8b0bc95159"]
SourceMap: webRoot: e:MitchWorkspaceProjectsproject-name
SourceMap: no sourceRoot specified, using webRoot + script path dirname: e:MitchWorkspaceProjectsproject-name
SourceMap: mapping webpack:///webpack/bootstrap 7617f9bf7c8b0bc95159 => webpackootstrap 7617f9bf7c8b0bc95159, via sourceMapPathOverrides entry - "webpack:///*": "*"
SourceMaps.scriptParsed: http://localhost:8080/manifest.0ec68ebd5f0abf9b4cd4.js was just loaded and has mapped sources: ["webpack\bootstrap 7617f9bf7c8b0bc95159"]

This is driving me insane, I have spent the last 3 hours scouring the Googles to no avail and it's currently 5AM.

UPDATE: Unfortunately, ever since making the question, I have stopped using VS Code and switched to Webstorm instead. Thanks all for the help and for your time.

question from:https://stackoverflow.com/questions/46438471/how-to-use-vs-code-debugger-with-webpack-dev-server-breakpoints-ignored

Answer 1

From my experience (about 15 mins ago), if 'webpack.config.js' has a value for the context property, then that has to be accounted for for '.vscode/launch.json'.

For an example, if 'webpack.config.js' has the following:

module.exports = {
  context: path.resolve(__dirname, 'src'),
  entry: './index.ts',

Then launch.json needs that context ('src') too:

"url": "http://localhost:8080/",
"webRoot": "${workspaceRoot}/src",
"sourceMaps": true,

I just updated/fixed my repo so now TypeScript breakpoints should bind.

https://github.com/marckassay/VSCodeNewProject

I hope that helps.