How to configure @typescript-eslint rules

Question

I'm trying to convert to @typescript-eslint but the documentation seems sorely lacking. For example, I'm getting errors like this:

Line 58:  Expected a semicolon             @typescript-eslint/member-delimiter-style

I want to enforce no semicolons or commas. I found the documentation for that rule. https://github.com/bradzacher/eslint-plugin-typescript/blob/master/docs/rules/member-delimiter-style.md

But it doesn't seem to give any examples of how to configure it in a real eslint file! Anyone know how?

user_3145923 · Answer

Using a .eslintrc.js configuration file you have to add this to the "rules" section:

"rules": {
    "@typescript-eslint/member-delimiter-style": ["error", {
      multiline: {
        delimiter: 'none',    // 'none' or 'semi' or 'comma'
        requireLast: true,
      },
      singleline: {
        delimiter: 'semi',    // 'semi' or 'comma'
        requireLast: false,
      },
    }]
}

Worked for me for the "@typescript-eslint/explicit-function-return-type" parameter. Options are from the rules project site on github

Thanks to maxkoryukov for improving my original answer.

user_4233951 · Answer

Here are some example rules from a .eslintrc.js file from a VueJS Typescript project.

The two different rules relating to semi colons are for javascript/.vue files, and typescript/.ts files.

rules: {
    'no-console': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
    quotes: [
      'error',
      'single'
    ],
    semi: [
      'error',
      'never'
    ],
    'vue/html-self-closing': [
      'error',
      {
        html: {
          void: 'any',
          normal: 'any',
          component: 'any'
        }
      }
    ],
    '@typescript-eslint/member-delimiter-style': [
      'error',
      {
        multiline: {
          delimiter: 'none',
          requireLast: true
        },
        singleline: {
          delimiter: 'semi',
          requireLast: false
        }
      }
    ]
  }

How to configure @typescript-eslint rules

2 Answers