Does not report any errors

[stellarhoof]

I can't seem to get this to work. Is there any way of enabling some sort of debugging?

My jsconfig.json:

 "options": {
    "allowJs": true,
    "maxNodeModuleJsDepth": 2,
    "allowSyntheticDefaultImports": true,
    "skipLibCheck": true,
    "noEmit": true,
    "plugins": [
      {
        "name": "typescript-eslint-language-service"
      }
    ]
 }

Relevant part of my tsserver log:

Info 8    [15:20:10.250] Enabling plugin typescript-eslint-language-service from candidate paths: /Users/berserk/Code/smartprocure/futil/node_modules/typescript/lib/tsserver.js/../../..
Info 9    [15:20:10.251] Loading typescript-eslint-language-service from /Users/berserk/Code/smartprocure/futil/node_modules/typescript/lib/tsserver.js/../../.. (resolved to /Users/berserk/Code/smartprocure/futil/node_modules/node_modules)
Info 10   [15:20:10.630] [typescript-eslint-language-service] config: {"name":"typescript-eslint-language-service"}
Info 11   [15:20:10.640] Plugin validation succeded
Info 12   [15:20:10.658] Starting updateGraphWorker: Project: /Users/berserk/Code/smartprocure/futil/jsconfig.json
Info 13   [15:20:12.965] Finishing updateGraphWorker: Project: /Users/berserk/Code/smartprocure/futil/jsconfig.json Version: 1 structureChanged: true Elapsed: 2307ms
Info 14   [15:20:12.965] Project '/Users/berserk/Code/smartprocure/futil/jsconfig.json' (Configured)
Info 15   [15:20:12.965] 	Files (417)

Info 16   [15:20:12.965] -----------------------------------------------
Info 17   [15:20:13.6] Project '/Users/berserk/Code/smartprocure/futil/jsconfig.json' (Configured)
Info 17   [15:20:13.6] 	Files (417)

Info 17   [15:20:13.6] -----------------------------------------------
Info 17   [15:20:13.6] Open files: 
Info 17   [15:20:13.6] 	FileName: /Users/berserk/Code/smartprocure/futil/src/function.js ProjectRootPath: /Users/berserk/Code/smartprocure/futil
Info 17   [15:20:13.6] 		Projects: /Users/berserk/Code/smartprocure/futil/jsconfig.json
Info 17   [15:20:13.404] [typescript-eslint-language-service] use '@typescript-eslint/parser'

My .eslintrc.js:

module.exports = {
  extends: 'smartprocure',
  parser: 'babel-eslint',
  parserOptions: {
    sourceType: 'module'
  }
}

And my devDependencies:

{
  "devDependencies": {
    "eslint": "^7.7.0",
    "@typescript-eslint/parser": "^3.9.0",
    "@typescript-eslint/typescript-estree": "^3.9.0",
    "typescript": "^3.9.7",
    "typescript-eslint-language-service": "^3.1.0",
    "typescript-language-server": "^0.4.0",
  }
} 

[mickaelistria]

Same issue here. Eclipse Wild Web Developer is using this plugin; but trying to upgrade to newer version shows similar symptoms, also with typescript-language-server.

[lorenzodallavecchia]

I'm having the same issue. I traced down the cause in my case.

In tsserver.log I see.

Info 600  [10:49:45.340] [typescript-eslint-language-service] The "path" argument must be of type string. Received undefined

The culprit is a call to path.extname inside @eslint/eslintrc/lib/config-array-factory.js (line 305).

function loadConfigFile(filePath) {
    switch (path.extname(filePath)) {
        // ...
    }
}

filePath is undefined.

Tracing back, the missing file path is the real path of eslint:recommended and it should have been passed to the CascadingConfigArrayFactory constructor as second-last parameter.

The language service plugin is not passing any parameter (which seems to be allowed by CascadingConfigArrayFactory), so the default undefined is being used.

In the end, this looks like a ESLint bug, since they have an optional argument with no default. The bug was introduced by the PR eslint/eslintrc#11.

A workaround is to stop using the eslint:recommended alias in .eslintrc.js.

module.exports = {
    // ...
    extends: [
        require.resolve("eslint/conf/eslint-recommended.js"),  // should be "eslint:recommended"
        "plugin:@typescript-eslint/recommended",
    ],
    // ...
};

[mickaelistria]

FWIW, Wild Web Developer migrated to use the language server that's behind the vscode-eslint extension and doesn't use this tsserver plugin any more.

[Quramy]

@lorenzodallavecchia Thanks for your comment. It helped me so much