Discussion on: Using ESLint and Prettier in a TypeScript Project

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Replies for: I ran a problem today with this setup. If I run prettier --single-quote --write then eslint --fix, it will fail because of this line: ...

You need to run prettier through ESLint, otherwise you'll get these kind of conflicts.

It seems that vscode is running prettier when formatting on save, rather than eslint! I will look into it on Monday when I back with my laptop :P

Robert Cooper • Apr 7 '19

You need to make sure to turn off the formatOnSave in VSCode for your JavaScript and Typescript files. Here are the settings:

"editor.formatOnSave": true,
"[javascript]": {
    "editor.formatOnSave": false,
  },
  "[javascriptreact]": {
    "editor.formatOnSave": false,
  },
  "[typescript]": {
    "editor.formatOnSave": false,
  },
  "[typescriptreact]": {
    "editor.formatOnSave": false,
  },

Then to make sure you get ESLint to fix problems on save, make sure you have the following settings in VS Code:

"eslint.autoFixOnSave": true,
  "eslint.validate": [
    "javascript",
    "javascriptreact",
    {"language": "typescript", "autoFix": true },
    {"language": "typescriptreact", "autoFix": true }
  ],

bitten • Apr 15 '19 • Edited

Thanks! But there is still an issue with it :( It seems like a conflict between eslint(prettier/prettier) and eslint(@typescript-eslint/indent). I also feel like eslint is running twice or something. For now I have set:

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

Here's my full eslint config file:

module.exports = {
    parser: '@typescript-eslint/parser',
    extends: [
        'plugin:@typescript-eslint/recommended',
        'plugin:prettier/recommended',
        'plugin:react/recommended',
    ],
    parserOptions: {
        ecmaVersion: 2018,
        sourceType: 'module',
        ecmaFeatures: {
            jsx: true,
        },
        project: './tsconfig.json',
        tsconfigRootDir: './',
    },
    settings: {
        react: {
            version: 'detect',
        },
    },
    rules: {
        '@typescript-eslint/interface-name-prefix': 'always',
        '@typescript-eslint/no-explicit-any': 'always',
        '@typescript-eslint/explicit-function-return-type': 'off',
        '@typescript-eslint/no-non-null-assertion': 'off',
        '@typescript-eslint/no-use-before-define': 'off',
        '@typescript-eslint/member-delimiter-style': {
            delimiter: 'none',
            requireLast: true,
        },
    }
}

VSCode User settings: hastebin.com/jucodoheqi.json
VSCode Workspace settings: hastebin.com/anenanupuh.json

Robert Cooper • Apr 19 '19

I think your extends array should be the following (I've added comments explaining things):

    extends: [
        'plugin:@typescript-eslint/recommended', // uses typescript-specific linting rules
        'plugin:react/recommended', // uses react-specific linting rules
        'plugin:prettier/recommended', // enables eslint-plugin-prettier and eslint-config-prettier
        'prettier/react', // disables react-specific linting rules that conflict with prettier
    ],

bitten • Apr 24 '19 • Edited

Still didn't seem to fix the issue! Although I also ran into this last week, which I have not been able to solve. Something must be wrong with my setup somewhere haha. Check it out:

Prettier wants this:

export default function Heading(
    props: HTMLProps<HTMLHeadingElement> & {
        as?: AsTags
        withComponent?: HeadingTags
    },
) /* .... */

But typescript fails to compile because of the missing comma after as?: AsTags as it wants as?: AsTags, but prettier removes it ._.

Thanks for providing the snippets though. If you can shed any light on this one I would appreciate it a ton :3