Override tsconfig in templates - DAV-1000/react-material GitHub Wiki

Created: 7/31/2025 14:17
Updated: 7/31/2025 15:43
Exported: 8/14/2025 11:11
Link: https://chatgpt.com/c/688b6cf2-5628-8001-99a3-a6fff0a8e340

Prompt:

How can I override the tsconfig value noUnusedLocals for code existing in the in the templates subfolder (and child folders) of my typescript vite react app

Response:

To override the noUnusedLocals TypeScript setting only for files under a specific directory (like templates/), TypeScript does not support per-folder overrides in tsconfig.json itself. However, there are a few practical workarounds depending on your goals:

✅ Workaround: Use a separate `tsconfig` file for the `templates` folder

You can create a separate tsconfig for the templates/ folder and exclude it from the main one.

Step-by-step:

Exclude templates/ from the main tsconfig.json:

// tsconfig.json
{
  "compilerOptions": {
    "noUnusedLocals": true,
    // other options
  },
  "exclude": ["templates"]
}

Create a separate tsconfig.templates.json in the root or inside templates/:

// templates/tsconfig.templates.json
{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "noUnusedLocals": false
  },
  "include": ["**/*"]
}

Make sure your tooling (e.g., IDEs or tsc) recognizes both configs.

You may need to run TypeScript with both configs, like:

tsc -p tsconfig.json
tsc -p templates/tsconfig.templates.json

If you're using Vite, you can integrate this into your build tooling or use conditional scripts.

❌ Why not just use `overrides` in tsconfig?

Unlike ESLint, TypeScript's tsconfig.json does not support path-based overrides. There's no official way to conditionally change settings like noUnusedLocals based on file paths within the same config.

Optional: Use ESLint Instead

If your goal is just to catch unused locals for code quality (not during type checking), you could turn off noUnusedLocals in TypeScript, and enforce it via ESLint with per-folder overrides:

// .eslintrc.json
{
  "overrides": [
    {
      "files": ["templates/**/*.{ts,tsx}"],
      "rules": {
        "@typescript-eslint/no-unused-vars": "off"
      }
    },
    {
      "files": ["src/**/*.{ts,tsx}"],
      "rules": {
        "@typescript-eslint/no-unused-vars": "error"
      }
    }
  ]
}

Summary

Approach	Good For	How
Separate `tsconfig`	Type-level enforcement	Use multiple `tsconfig` files and exclude/include accordingly
ESLint override	Linting	Use ESLint `overrides` to selectively apply unused var checks

Let me know if you want help automating the multi-config setup or integrating it into Vite.

Prompt:

The readme.md in the root of this app contains the following re eslint. Break it down into steps for implementing eslint: If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:

js export default tseslint.config([ globalIgnores(['dist']), { files: ['**/*.{ts,tsx}'], extends: [ // Other configs...

  // Remove tseslint.configs.recommended and replace with this
  ...tseslint.configs.recommendedTypeChecked,
  // Alternatively, use this for stricter rules
  ...tseslint.configs.strictTypeChecked,
  // Optionally, add this for stylistic rules
  ...tseslint.configs.stylisticTypeChecked,

  // Other configs...
],
languageOptions: {
  parserOptions: {
    project: ['./tsconfig.node.json', './tsconfig.app.json'],
    tsconfigRootDir: import.meta.dirname,
  },
  // other options...
},

}, ])

You can also install eslint-plugin-react-x and eslint-plugin-react-dom for React-specific lint rules:

js // eslint.config.js import reactX from 'eslint-plugin-react-x' import reactDom from 'eslint-plugin-react-dom'

export default tseslint.config([ globalIgnores(['dist']), { files: ['**/*.{ts,tsx}'], extends: [ // Other configs... // Enable lint rules for React reactX.configs['recommended-typescript'], // Enable lint rules for React DOM reactDom.configs.recommended, ], languageOptions: { parserOptions: { project: ['./tsconfig.node.json', './tsconfig.app.json'], tsconfigRootDir: import.meta.dirname, }, // other options... }, }, ])

Response:

Here’s a step-by-step breakdown to implement type-aware ESLint configuration and React-specific rules based on the README.md instructions:

✅ Step-by-Step ESLint Setup

1. Install ESLint and dependencies

Run this in your project root:

npm install --save-dev eslint @typescript-eslint/eslint-plugin @typescript-eslint/parser @eslint/js typescript-eslint eslint-plugin-react-x eslint-plugin-react-dom

Or with pnpm:

pnpm add -D eslint @typescript-eslint/eslint-plugin @typescript-eslint/parser @eslint/js typescript-eslint eslint-plugin-react-x eslint-plugin-react-dom

2. Create `eslint.config.js` in the root

Use the tseslint.config helper and apply type-aware settings.

// eslint.config.js
import { tseslint } from 'typescript-eslint'
import { globalIgnores } from '@eslint/js'
import reactX from 'eslint-plugin-react-x'
import reactDom from 'eslint-plugin-react-dom'

export default tseslint.config([
  globalIgnores(['dist']), // Ignore build output

  {
    files: ['**/*.{ts,tsx}'],
    extends: [
      // Type-aware ESLint rules
      ...tseslint.configs.recommendedTypeChecked, // Use 'strictTypeChecked' for stricter rules
      // Optional: stylistic formatting rules (spacing, quotes, etc.)
      ...tseslint.configs.stylisticTypeChecked,

      // React-specific rules
      reactX.configs['recommended-typescript'],
      reactDom.configs.recommended,
    ],
    languageOptions: {
      parserOptions: {
        project: ['./tsconfig.node.json', './tsconfig.app.json'],
        tsconfigRootDir: import.meta.dirname,
      },
    },
  },
])

3. Add `tsconfig.app.json` and `tsconfig.node.json`

Make sure these exist and cover all the relevant files.

For example:

// tsconfig.app.json
{
  "extends": "./tsconfig.json",
  "include": ["src", "templates"]
}

// tsconfig.node.json
{
  "extends": "./tsconfig.json",
  "include": ["scripts", "vite.config.ts"]
}

4. Run ESLint

If you're using the latest ESLint (v9+ with flat config), run:

npx eslint . --ext .ts,.tsx

For Vite projects, you can optionally add a script in package.json:

"scripts": {
  "lint": "eslint . --ext .ts,.tsx"
}

✅ Summary

Step	What You Did
1	Installed ESLint + TypeScript + React plugins
2	Created `eslint.config.js` using `tseslint.config`
3	Ensured `tsconfig` files are configured correctly
4	Ran ESLint using the new config

Let me know if you want stricter rule suggestions or auto-fix/prettier integration next.

Prompt:

Why eslint.config.js and not eslint.config.ts

Response:

Great question. Whether to use eslint.config.js or eslint.config.ts depends on which ESLint version you're using and your tooling setup. Here's a breakdown of why eslint.config.js is used and when you can use eslint.config.ts instead:

🧠 Why `eslint.config.js` is used by default

1. ESLint v9+ uses the "Flat Config" format

ESLint switched to the "flat config" system starting in v8.21, fully stable in v9.
The eslint.config.js file is the new standard for this system.
Flat config must be in .js, .mjs, or .cjs unless you're using an extra build step.

2. ESLint doesn't compile `.ts` config files

ESLint does not run TypeScript natively for its config file.
If you write eslint.config.ts, you’ll need to transpile it yourself before ESLint can use it.
- This requires a build step (e.g., with ts-node, vite-node, or a manual build via tsc).
- It's not officially supported out-of-the-box.

✅ You can use `eslint.config.ts` if...

If you’re okay with the complexity, you can use eslint.config.ts by:

Installing ts-node:
```
npm install --save-dev ts-node
```
Creating a eslint.config.ts file, and then running ESLint like this:
```
node --loader ts-node/esm ./node_modules/.bin/eslint .
```
Or configure a custom runner via vite, turbo, or your task runner of choice.

🟨 Recommendation

Use case	Use `eslint.config.js`?	Use `eslint.config.ts`?
Simplicity, zero config	✅ Yes	❌ No
You want to write config in TypeScript	🔶 Possible, but needs setup	✅ Yes, with `ts-node`
Running ESLint in CI/build	✅ Less error-prone	🔶 OK if build step is solid

TL;DR

Use eslint.config.js because:

It’s the default and fully supported format for ESLint flat config.
ESLint doesn't natively support .ts config files.
eslint.config.ts requires manual setup, which adds overhead and complexity.

Let me know if you want a ready-to-go eslint.config.ts + ts-node setup—happy to walk you through it.

Prompt:

How to add a lint rule for noUnusedLocals

Response:

To add a lint rule that enforces no unused locals (like variables, functions, etc. that are declared but not used), you have two main options depending on whether you want type-aware checking via TypeScript or just linting via ESLint.

✅ Option 1: Enforce via TypeScript (`noUnusedLocals`)

This is a compiler option, not an ESLint rule.

🔧 Add to `tsconfig.json`:

{
  "compilerOptions": {
    "noUnusedLocals": true
  }
}

🔎 Behavior:

Works at compile-time (tsc).
Fully type-aware.
Doesn't require ESLint.
Cannot be overridden per file/folder (unless using multiple tsconfig files).

✅ Option 2: Enforce via ESLint (`@typescript-eslint/no-unused-vars`)

This works as a lint rule and is customizable.

🔧 Add to `eslint.config.js` or `eslint.config.ts`:

If you're using the flat config format:

import { tseslint } from 'typescript-eslint'

export default tseslint.config([
  {
    files: ['**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-unused-vars': ['error', { vars: 'all', args: 'after-used', ignoreRestSiblings: true }],
    },
    // include parserOptions etc. here
  }
])

🔎 Behavior:

Works in ESLint, can be run in editors, CI, etc.
Allows per-folder or per-file overrides.
Can be customized: ignore function args, ignore rest patterns, etc.

🧠 Which Should You Use?

Feature	TypeScript (`noUnusedLocals`)	ESLint (`@typescript-eslint/no-unused-vars`)
Type-aware	✅ Yes	✅ Yes (if type-aware config is set)
Per-folder override	❌ No	✅ Yes (via `files` in flat config)
Fixable	❌ No	✅ Often fixable with `--fix`
Error on compile	✅ Yes	❌ No (but can block CI via lint)
Use both?	✅ Yes, but avoid duplication of effort

🎯 Best Practice

Use both:

Use noUnusedLocals: true in tsconfig.json for strict compile-time errors.
Use @typescript-eslint/no-unused-vars in eslint.config.js for lint flexibility and per-folder customization.

Let me know if you'd like an example with folder-based overrides (like disabling unused checks in templates/) using ESLint.

Prompt:

How do I override no-empty-object-type in folder templates and all its subfolders

Response:

To override the no-empty-object-type rule only in the templates/ folder and all its subfolders, you’ll need to use the ESLint flat config files pattern matching system.

Assuming you’re using the flat config (eslint.config.js), here’s how to do it:

✅ Step-by-Step: Override `no-empty-object-type` in `templates/`

1. Make sure you're using `@typescript-eslint` rules

If not installed already:

npm install --save-dev @typescript-eslint/eslint-plugin

2. In your `eslint.config.js`, add an override for the `templates` folder:

import { tseslint } from 'typescript-eslint'

export default tseslint.config([
  {
    files: ['**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'error', // default behavior
    },
    languageOptions: {
      parserOptions: {
        project: ['./tsconfig.json'],
        tsconfigRootDir: import.meta.dirname,
      },
    },
  },

  // Override for templates folder
  {
    files: ['templates/**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'off',
    },
  },
])

🧠 How it works

ESLint applies the rules in order.
The second block applies to all .ts and .tsx files under templates/ and overrides the earlier config.
The rule is now disabled only in that folder.

✅ Notes

The file paths are relative to the ESLint working directory (usually the project root).
If you're using .eslintignore, make sure it doesn't exclude templates/.
The same approach works for any other rule you'd like to override by folder.

Let me know if you'd like to also override this based on specific filename patterns (like *.generated.ts) or to enable other rule differences in templates/.

Prompt:

It's not working

Response:

Thanks for the update—let’s get it working.

Here’s a checklist and refined setup for overriding the @typescript-eslint/no-empty-object-type rule only in templates/ and its subfolders, assuming you are using ESLint flat config with TypeScript-aware rules.

✅ 1. Make sure the folder pattern is correct

Your override block must come after the global rules, and the files glob must match:

// eslint.config.js
import { tseslint } from 'typescript-eslint'

export default tseslint.config([
  // Global config (applies to all TS/TSX files)
  {
    files: ['**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'error', // default rule
    },
    languageOptions: {
      parserOptions: {
        project: ['./tsconfig.app.json', './tsconfig.node.json'],
        tsconfigRootDir: import.meta.dirname,
      },
    },
  },

  // Override for templates/
  {
    files: ['templates/**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'off',
    },
  },
])

✅ 2. Check rule name

There’s no official rule named @typescript-eslint/no-empty-object-type. The correct name is:

@typescript-eslint/ban-types

You likely meant to disable this warning for empty object types {} or object.

So change:

'@typescript-eslint/no-empty-object-type': 'off'

To:

'@typescript-eslint/ban-types': [
  'error',
  {
    types: {
      '{}': false, // allow empty object types
    },
    extendDefaults: true,
  },
]

Or disable it altogether in the templates folder:

rules: {
  '@typescript-eslint/ban-types': 'off',
}

✅ 3. Test override

Create a test file:

// templates/test.ts
function foo(bar: {}) {
  console.log(bar)
}

This should not report a ban-types violation if the override is working.

✅ 4. Clear ESLint cache (if any)

If ESLint is using cache, try:

npx eslint . --ext .ts,.tsx --no-cache

✅ 5. Debug with ESLint CLI

Run ESLint with debug logging to see what config applies:

npx eslint templates/test.ts --print-config

Look for @typescript-eslint/ban-types in the output and verify that it is set to 'off'.

✅ Summary

What to check	Fix
Rule name	Use `@typescript-eslint/ban-types`
Folder match	Use `templates/*/.{ts,tsx}`
Rule position	Ensure overrides come after the global rule
Debug	Use `--print-config` to verify ESLint applies the override

Let me know if you want me to check your full eslint.config.js—just paste it here.

Prompt:

no-empty-object-type does exist and is detailed here: https://typescript-eslint.io/rules/no-empty-object-type/

Response:

You're absolutely right — and thank you for the correction.

✅ @typescript-eslint/no-empty-object-type is a valid, real rule. It was introduced to specifically ban empty object types like {} or object because they're usually too broad and often incorrect. It's separate from ban-types, which is more general.

🧩 Why your override might not be working

Now that we’ve clarified that no-empty-object-type is a real rule, here’s how to properly override it for the templates/ folder using ESLint Flat Config:

✅ Correct Setup for Overriding `no-empty-object-type`

// eslint.config.js
import { tseslint } from 'typescript-eslint'

export default tseslint.config([
  // 1. Default/global config for all TS files
  {
    files: ['**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'error', // apply globally
    },
    languageOptions: {
      parserOptions: {
        project: ['./tsconfig.app.json', './tsconfig.node.json'],
        tsconfigRootDir: import.meta.dirname,
      },
    },
  },

  // 2. Override for the templates folder and its subfolders
  {
    files: ['templates/**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'off',
    },
  },
])

🧪 Test it

Make sure to create a test file like templates/foo.ts with:

function takesEmpty(obj: {}) {
  console.log(obj)
}

Then run:

npx eslint templates/foo.ts

You should not see a warning about no-empty-object-type if the override is working.

🧰 Troubleshooting Tips

If it's still not working:

1. Ensure you’re using ESLint v8.21+ (Flat config support)

npx eslint -v

You need Flat config to use eslint.config.js. If you're using an .eslintrc, this setup won't work as-is.

2. Use `--print-config` to verify

npx eslint templates/foo.ts --print-config

Look for:

"@typescript-eslint/no-empty-object-type": "off"

If it still shows as "error" here, your override block is being skipped (likely due to file matching issues).

3. No `.eslintignore` blocking files

Make sure templates/ isn’t ignored.

✅ Summary

Key Point	✅
Rule exists and is valid	✅ Yes: `@typescript-eslint/no-empty-object-type`
Can be disabled via flat config	✅ Yes
Needs to be after global rules	✅ Yes
Path matching must be exact	✅ Yes: `'templates/*/.{ts,tsx}'`

Would you like me to double-check a full config or a real file path you're using? Paste either one in and I can confirm it line by line.

Prompt:

This: Value for 'print-config' of type 'path::String' required. You're using eslint.config.js, some command line flags are no longer available. Please see https://eslint.org/docs/latest/use/command-line-interface for details. Was the result of running npx eslint templates/foo.ts --print-config

Response:

Great catch — you're seeing that message because --print-config is not supported when you're using the new ESLint Flat Config (eslint.config.js) system.

🧠 Why this happens

As of ESLint v9+ with flat config, --print-config no longer works the way it used to.

Instead, ESLint expects you to use:

npx eslint --print-config path/to/file.ts

BUT: this feature only works if:

You pass a literal path, not a glob or relative segment like templates/foo.ts.
The path is valid, and the file exists.
ESLint is not using eslint.config.js with tseslint.config(...) from typescript-eslint, because some dynamic parts of that system make --print-config not fully compatible (as of now).

✅ Workaround: Debug your config manually

Since --print-config doesn't help, here's how to ensure your override works:

✅ 1. Ensure file exists and path is correct

File: templates/foo.ts (should exist).
Glob: 'templates/**/*.{ts,tsx}'.

✅ 2. Temporarily inject a console log into the config (debug hack)

Add this in eslint.config.js inside the override to verify it's being picked up:

console.log('Applying templates override')

You can also add a fake rule and check if it fails:

{
  files: ['templates/**/*.{ts,tsx}'],
  rules: {
    '@typescript-eslint/no-empty-object-type': 'off',
    'no-console': 'error', // intentionally throw an error
  },
}

Then in templates/foo.ts:

console.log("hello") // <-- should now trigger a 'no-console' error

If you see the error, you know the override block is working, and no-empty-object-type is correctly turned off.

✅ 3. Try a minimal test config (optional sanity check)

Create a temporary ESLint config just for templates/:

// eslint.config.templates.js
import { tseslint } from 'typescript-eslint'

export default tseslint.config([
  {
    files: ['**/*.ts'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'off',
    },
    languageOptions: {
      parserOptions: {
        project: ['./tsconfig.json'],
        tsconfigRootDir: import.meta.dirname,
      },
    },
  },
])

Then run:

npx eslint templates/foo.ts --config eslint.config.templates.js

If this works, it confirms that your override is structurally sound — and the issue lies in the full config or rule precedence.

✅ Summary of What to Try

Step	Why
✅ Confirm file paths/globs	ESLint needs correct relative paths
✅ Add a temporary rule like `'no-console': 'error'`	To test that override block runs
✅ Use debug logging in config	Helps confirm block is evaluated
❌ Don’t rely on `--print-config` with flat config	Not fully supported yet with `tseslint.config()`

If you want, paste your exact eslint.config.js and the file path you're testing, and I’ll verify your override logic line by line.

Prompt:

OK. If I apply this globally: @typescript-eslint/no-empty-object-type': 'off'. Then I don't get an error. But if I change that line to '@typescript-eslint/no-empty-object-type': 'error' and add the line '@typescript-eslint/no-empty-object-type': 'off', to the rules collection of the override targeting files: ['templates/**/*.{ts,tsx}'] the override is not honoured

Response:

Thanks — that’s very clear and helps pinpoint the issue.

What you’re describing means ESLint isn’t matching your override for templates/**/*.{ts,tsx}, even though the rule works globally.

✅ Let’s fix that override with precision.

Here’s a complete checklist to solve this reliably:

✅ 1. Confirm the relative path used in `files` glob is correct

ESLint flat config globs are relative to the current working directory (typically your project root). So:

files: ['templates/**/*.{ts,tsx}']

Only matches if your actual file path looks like:

your-project-root/
├── templates/
│   ├── something.ts

If you're running ESLint from a subfolder, like cd src && npx eslint ../templates/foo.ts, the glob won’t match correctly.

➡️ Always run ESLint from the project root:

npx eslint templates/foo.ts

✅ 2. Put the override after the global config block

ESLint flat config applies files blocks in order. Later blocks override earlier ones only if the file matches.

Your config must look like this:

import { tseslint } from 'typescript-eslint'

export default tseslint.config([
  // 1. Global block
  {
    files: ['**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'error',
    },
    languageOptions: {
      parserOptions: {
        project: ['./tsconfig.app.json', './tsconfig.node.json'],
        tsconfigRootDir: import.meta.dirname,
      },
    },
  },

  // 2. Override for templates
  {
    files: ['templates/**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'off',
    },
  },
])

✅ 3. Make sure the test file is matched

Create a file at:

templates/test.ts

With this content:

function doSomething(input: {}) {
  console.log(input)
}

Now run:

npx eslint templates/test.ts

You should NOT get:

error  Don't use empty object type `{}`  @typescript-eslint/no-empty-object-type

🔎 Still not working?

➕ Add debug test rule (like `no-console`)

Temporarily inject a known error:

{
  files: ['templates/**/*.{ts,tsx}'],
  rules: {
    '@typescript-eslint/no-empty-object-type': 'off',
    'no-console': 'error', // debug test
  },
}

In templates/test.ts, add:

console.log("test")

If you see the no-console error, then the override is working, but no-empty-object-type may be duplicated from another config (see next point).

🛑 Check for Duplicated Rule Definitions

tseslint.configs.recommendedTypeChecked, strictTypeChecked, or other imported configs may re-enable the rule later — especially if you use multiple extends arrays.

To fix that:

Place your files: ['templates/...'] override last in the config array.
Double-check that you're not pulling in that rule again elsewhere.

✅ Final Tip: Print Matched Globs

If you're still stuck, install eslint-plugin-globs-debug or insert this:

console.log('ESLint override active for templates/**/*.{ts,tsx}')

into the templates override block to confirm it’s executing.

✅ TL;DR Summary

Step	Check
✅ Glob path matches actual file	`templates/*/.{ts,tsx}`
✅ File exists	`templates/test.ts`
✅ ESLint is run from project root	`npx eslint templates/test.ts`
✅ Override block comes after global block	Order matters
✅ Rule isn't re-enabled elsewhere	Avoid duplicate rule via other configs

If you're still seeing the issue, send me:

Your exact eslint.config.js
The file path and contents you're testing

And I’ll debug it directly with you.

Prompt:

I want the overrides to apply to all files in templates/blog/ and templates/shared-theme/. The templates folder is in the root of src

Response:

Perfect — now we’re getting specific. Here’s exactly how to configure the ESLint flat config override for files in:

src/templates/blog/
src/templates/shared-theme/

Assuming you're running ESLint from the project root, the file paths should be matched with:

files: ['src/templates/{blog,shared-theme}/**/*.{ts,tsx}']

✅ Final Working Config Snippet

// eslint.config.js
import { tseslint } from 'typescript-eslint'

export default tseslint.config([
  // Global config (applies to all TS/TSX files)
  {
    files: ['**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'error', // enforce globally
    },
    languageOptions: {
      parserOptions: {
        project: ['./tsconfig.app.json', './tsconfig.node.json'],
        tsconfigRootDir: import.meta.dirname,
      },
    },
  },

  // Override for specific subfolders of src/templates/
  {
    files: ['src/templates/{blog,shared-theme}/**/*.{ts,tsx}'],
    rules: {
      '@typescript-eslint/no-empty-object-type': 'off',
    },
  },
])

✅ Explanation

Part	Meaning
`files: ['src/templates/{blog,shared-theme}/*/.{ts,tsx}']`	Only applies to files in `src/templates/blog/` and `src/templates/shared-theme/`, including all subfolders
Rule override	Disables `@typescript-eslint/no-empty-object-type` just for these paths
Order matters	This block must come after the global rules so it overrides them

✅ Test it

Create file: src/templates/blog/test.ts with:

function foo(x: {}) {
  console.log(x)
}

Run:

npx eslint src/templates/blog/test.ts

You should not see any error about no-empty-object-type.

Let me know if you're using any vite.config.ts or build scripts that alter the working directory — but if you run ESLint from project root and use the above config, you're set.

Prompt:

That works. How to fix this error: error Definition for rule 'import/prefer-default-export' was not found import/prefer-default-export

Response:

Great to hear the override works!

About your new error:

error  Definition for rule 'import/prefer-default-export' was not found  import/prefer-default-export

Why it happens

This error means ESLint can't find the rule import/prefer-default-export, which comes from the eslint-plugin-import package.

How to fix it

1. Install `eslint-plugin-import`

If you don’t already have it installed, run:

npm install --save-dev eslint-plugin-import

or with yarn:

yarn add -D eslint-plugin-import

2. Add it to your ESLint config

Since you are using the flat config (eslint.config.js), you need to:

Import the plugin
Add it to your config with its recommended settings or manually

Example:

import importPlugin from 'eslint-plugin-import'

export default [
  // other configs ...
  {
    plugins: {
      import: importPlugin,
    },
    rules: {
      'import/prefer-default-export': 'error',
      // other import rules...
    },
  },
]

3. If you use `extends` from `eslint-plugin-import`

You can also add their recommended config:

extends: [
  // other extends ...
  'plugin:import/recommended',
],

but in flat config, this usually means importing and spreading their config explicitly, or referencing it via:

import importPlugin from 'eslint-plugin-import'

export default [
  {
    plugins: {
      import: importPlugin,
    },
    extends: [
      ...importPlugin.configs.recommended,
    ],
  },
]

Summary:

Step	What to do
1	Install `eslint-plugin-import`
2	Import plugin in `eslint.config.js`
3	Add plugin to `plugins` and rules or extends

If you want, I can help you update your full eslint.config.js accordingly!

Prompt:

It's just this line in a file. /* eslint-disable import/prefer-default-export */. The file is imported from material UI and I don't want to change it. Is there not a simpler way to suppress all error messages from this file and others in the same folder

Response:

Got it! You want to silence all ESLint errors (including the missing rule error) for that file and others in the same folder, without modifying the source files themselves.

Simple and clean way to do this:

Add an ESLint override in your eslint.config.js that disables all rules for those files.

Example: Disable all linting for files in a folder (e.g., `src/some-folder/`)

export default tseslint.config([
  // your existing configs...

  {
    files: ['src/some-folder/**/*.{ts,tsx,js,jsx}'], // adjust path & extensions
    rules: {
      // disable all rules for these files:
      // can do this by turning off the 'eslint' core rules (but no blanket switch exists),
      // so you can turn off problematic rules or turn off linting entirely by overriding parserOptions to null:
      // but simplest is disabling all known rules:

      // Disable every rule by setting 'off' - easiest is to set:
      'import/prefer-default-export': 'off',
      // add any other rules you want to silence here

      // OR, disable eslint entirely in these files by setting 'no-restricted-syntax' to 'off' is not enough,
      // so you can disable all rules known by listing them or set 'root: true' in a nested .eslintrc file.
    },
  },
])

But to disable all rules for a file/folder:

Unfortunately, ESLint has no built-in "disable all rules" switch, but you can:

Set the override for those files with:

{
  files: ['src/some-folder/**/*.{ts,tsx,js,jsx}'],
  rules: Object.fromEntries(
    Object.keys(require('eslint/conf/eslint-recommended').rules).map(rule => [rule, 'off'])
  ),
}

Or, easier: just add a .eslintignore file and list that folder there, which completely skips ESLint for those files:

src/some-folder/

My recommendation:

If you want to suppress all errors in those files/folder (including missing rule errors):

Add those folders to your .eslintignore file:

src/some-folder/

This way ESLint won’t lint those files at all — no errors, no warnings, nothing.

Summary

Method	Effect	Pros	Cons
Add override disabling specific rules in `eslint.config.js`	Disable certain rules only	Granular control	Must list every problematic rule
Add folder to `.eslintignore`	ESLint ignores those files completely	Simple & full silence	No linting at all for those files

If you want, I can help write an exact override for your folder, just let me know the folder path!

Prompt:

The ".eslintignore" file is no longer supported. Switch to using the "ignores" property in "eslint.config.js": https://eslint.org/docs/latest/use/configure/migration-guide#ignoring-files

Response:

Right, with the new ESLint flat config (eslint.config.js), .eslintignore is deprecated and you should use the ignores property in your config instead.

How to ignore files/folders using the `ignores` property

Simply add a top-level ignores key in your eslint.config.js (or inside your tseslint.config([...]) call) like this:

import { tseslint } from 'typescript-eslint'

export default tseslint.config([
  tseslint.globalIgnores(['dist']),  // example from before

  // Add this to ignore your folder completely:
  tseslint.globalIgnores(['src/some-folder/**']),

  // ... your other configs here ...
])

Or directly:

export default [
  {
    ignores: ['src/some-folder/**'],
  },
  // other configs...
]

For your case, to ignore all files in the folder where those files with `import/prefer-default-export` errors come from:

If the folder is src/templates/shared-theme/ or wherever those files live, add:

import { tseslint } from 'typescript-eslint'

export default tseslint.config([
  tseslint.globalIgnores([
    'dist',
    'src/templates/shared-theme/**',   // ignore all files in this folder
  ]),

  // your other configs...
])

This will cause ESLint to skip linting those files entirely — so no rules, no errors, no warnings.

TL;DR

.eslintignore → deprecated with flat config
Use ignores or globalIgnores in eslint.config.js
Example to ignore a folder:

tseslint.globalIgnores(['src/path/to/folder/**'])

If you want me to generate a minimal full example eslint.config.js with this included, just say the word!

Prompt:

That did it

Response:

Awesome! Glad that worked out for you. If you need help with anything else ESLint, TypeScript, or Vite-related, just shout! 🚀😄

Override tsconfig in templates - DAV-1000/react-material GitHub Wiki

Prompt:

Response:

✅ Workaround: Use a separate tsconfig file for the templates folder

Step-by-step:

❌ Why not just use overrides in tsconfig?

Optional: Use ESLint Instead

Summary

Prompt:

Response:

✅ Step-by-Step ESLint Setup

1. Install ESLint and dependencies

2. Create eslint.config.js in the root

3. Add tsconfig.app.json and tsconfig.node.json

4. Run ESLint

✅ Summary

Prompt:

Response:

🧠 Why eslint.config.js is used by default

1. ESLint v9+ uses the "Flat Config" format

2. ESLint doesn't compile .ts config files

✅ You can use eslint.config.ts if...

🟨 Recommendation

TL;DR

Prompt:

Response:

✅ Option 1: Enforce via TypeScript (noUnusedLocals)

🔧 Add to tsconfig.json:

🔎 Behavior:

✅ Option 2: Enforce via ESLint (@typescript-eslint/no-unused-vars)

🔧 Add to eslint.config.js or eslint.config.ts:

🔎 Behavior:

🧠 Which Should You Use?

🎯 Best Practice

Prompt:

Response:

✅ Step-by-Step: Override no-empty-object-type in templates/

1. Make sure you're using @typescript-eslint rules

2. In your eslint.config.js, add an override for the templates folder:

🧠 How it works

✅ Notes

Prompt:

Response:

✅ 1. Make sure the folder pattern is correct

✅ 2. Check rule name

✅ 3. Test override

✅ 4. Clear ESLint cache (if any)

✅ 5. Debug with ESLint CLI

✅ Summary

Prompt:

Response:

🧩 Why your override might not be working

✅ Correct Setup for Overriding no-empty-object-type

🧪 Test it

🧰 Troubleshooting Tips

1. Ensure you’re using ESLint v8.21+ (Flat config support)

2. Use --print-config to verify

3. No .eslintignore blocking files

✅ Summary

Prompt:

Response:

🧠 Why this happens

✅ Workaround: Debug your config manually

✅ 1. Ensure file exists and path is correct

✅ 2. Temporarily inject a console log into the config (debug hack)

✅ 3. Try a minimal test config (optional sanity check)

✅ Summary of What to Try

Prompt:

Response:

✅ Let’s fix that override with precision.

✅ 1. Confirm the relative path used in files glob is correct

✅ 2. Put the override after the global config block

✅ 3. Make sure the test file is matched

You should NOT get:

🔎 Still not working?

➕ Add debug test rule (like no-console)

🛑 Check for Duplicated Rule Definitions

✅ Final Tip: Print Matched Globs

✅ TL;DR Summary

Prompt:

✅ Workaround: Use a separate `tsconfig` file for the `templates` folder

❌ Why not just use `overrides` in tsconfig?

2. Create `eslint.config.js` in the root

3. Add `tsconfig.app.json` and `tsconfig.node.json`

🧠 Why `eslint.config.js` is used by default

2. ESLint doesn't compile `.ts` config files

✅ You can use `eslint.config.ts` if...

✅ Option 1: Enforce via TypeScript (`noUnusedLocals`)

🔧 Add to `tsconfig.json`:

✅ Option 2: Enforce via ESLint (`@typescript-eslint/no-unused-vars`)

🔧 Add to `eslint.config.js` or `eslint.config.ts`:

✅ Step-by-Step: Override `no-empty-object-type` in `templates/`

1. Make sure you're using `@typescript-eslint` rules

2. In your `eslint.config.js`, add an override for the `templates` folder:

✅ Correct Setup for Overriding `no-empty-object-type`

2. Use `--print-config` to verify

3. No `.eslintignore` blocking files

✅ 1. Confirm the relative path used in `files` glob is correct

➕ Add debug test rule (like `no-console`)

1. Install `eslint-plugin-import`

3. If you use `extends` from `eslint-plugin-import`

Example: Disable all linting for files in a folder (e.g., `src/some-folder/`)

How to ignore files/folders using the `ignores` property

For your case, to ignore all files in the folder where those files with `import/prefer-default-export` errors come from: