eslint-config-ts-strict/rules/es6.js

Very strict ESLint config for projects using TypeScript, React and Prettier. ESLint v9 flat config only. Formatting rules disabled to prevent Prettier conflicts.

export default {
  rules: {
    // enforces no braces where they can be omitted
    // https://eslint.org/docs/rules/arrow-body-style
    // TODO: enable requireReturnForObjectLiteral?
    "arrow-body-style": [
      "error",
      "as-needed",
      {
        requireReturnForObjectLiteral: false,
      },
    ],

    // require parens in arrow function arguments
    // https://eslint.org/docs/rules/arrow-parens
    // PRETTIER CONFLICT: This rule conflicts with Prettier formatting
    "arrow-parens": "off",

    // require space before/after arrow function's arrow
    // https://eslint.org/docs/rules/arrow-spacing
    // PRETTIER CONFLICT: This rule conflicts with Prettier formatting
    "arrow-spacing": "off",

    // verify super() callings in constructors
    "constructor-super": "error",

    // enforce the spacing around the * in generator functions
    // https://eslint.org/docs/rules/generator-star-spacing
    // PRETTIER CONFLICT: This rule conflicts with Prettier formatting
    "generator-star-spacing": "off",

    // disallow modifying variables of class declarations
    // https://eslint.org/docs/rules/no-class-assign
    "no-class-assign": "error",

    // disallow arrow functions where they could be confused with comparisons
    // https://eslint.org/docs/rules/no-confusing-arrow
    "no-confusing-arrow": [
      "error",
      {
        allowParens: true,
      },
    ],

    // disallow modifying variables that are declared using const
    "no-const-assign": "error",

    // disallow symbol constructor
    // https://eslint.org/docs/rules/no-new-symbol
    "no-new-symbol": "error",

    // Disallow specified names in exports
    // https://eslint.org/docs/rules/no-restricted-exports
    "no-restricted-exports": [
      "error",
      {
        restrictedNamedExports: [
          "default", // use `export default` to provide a default export
          "then", // this will cause tons of confusion when your module is dynamically `import()`ed, and will break in most node ESM versions
        ],
      },
    ],

    // disallow to use this/super before super() calling in constructors.
    // https://eslint.org/docs/rules/no-this-before-super
    "no-this-before-super": "error",

    // disallow useless computed property keys
    // https://eslint.org/docs/rules/no-useless-computed-key
    "no-useless-computed-key": "error",

    // disallow renaming import, export, and destructured assignments to the same name
    // https://eslint.org/docs/rules/no-useless-rename
    "no-useless-rename": [
      "error",
      {
        ignoreDestructuring: false,
        ignoreImport: false,
        ignoreExport: false,
      },
    ],

    // require let or const instead of var
    "no-var": "error",

    // require method and property shorthand syntax for object literals
    // https://eslint.org/docs/rules/object-shorthand
    "object-shorthand": [
      "error",
      "always",
      {
        ignoreConstructors: false,
        avoidQuotes: true,
      },
    ],

    // suggest using arrow functions as callbacks
    "prefer-arrow-callback": [
      "error",
      {
        allowNamedFunctions: false,
        allowUnboundThis: true,
      },
    ],

    // suggest using of const declaration for variables that are never modified after declared
    "prefer-const": [
      "error",
      {
        destructuring: "any",
        ignoreReadBeforeAssign: true,
      },
    ],

    // Prefer destructuring from arrays and objects
    // https://eslint.org/docs/rules/prefer-destructuring
    "prefer-destructuring": [
      "error",
      {
        VariableDeclarator: {
          array: false,
          object: true,
        },
        AssignmentExpression: {
          array: true,
          object: false,
        },
      },
      {
        enforceForRenamedProperties: false,
      },
    ],

    // disallow parseInt() in favor of binary, octal, and hexadecimal literals
    // https://eslint.org/docs/rules/prefer-numeric-literals
    "prefer-numeric-literals": "error",

    // suggest using Reflect methods where applicable
    // https://eslint.org/docs/rules/prefer-reflect
    "prefer-reflect": "off",

    // use rest parameters instead of arguments
    // https://eslint.org/docs/rules/prefer-rest-params
    "prefer-rest-params": "error",

    // suggest using the spread syntax instead of .apply()
    // https://eslint.org/docs/rules/prefer-spread
    "prefer-spread": "error",

    // suggest using template literals instead of string concatenation
    // https://eslint.org/docs/rules/prefer-template
    "prefer-template": "error",

    // disallow generator functions that do not have yield
    // https://eslint.org/docs/rules/require-yield
    "require-yield": "error",

    // enforce spacing between object rest-spread
    // https://eslint.org/docs/rules/rest-spread-spacing
    // PRETTIER CONFLICT: This rule conflicts with Prettier formatting
    "rest-spread-spacing": "off",

    // import sorting
    // https://eslint.org/docs/rules/sort-imports
    "sort-imports": [
      "off",
      {
        ignoreCase: false,
        ignoreDeclarationSort: false,
        ignoreMemberSort: false,
        memberSyntaxSortOrder: ["none", "all", "multiple", "single"],
      },
    ],

    // require a Symbol description
    // https://eslint.org/docs/rules/symbol-description
    "symbol-description": "error",

    // enforce usage of spacing in template strings
    // https://eslint.org/docs/rules/template-curly-spacing
    // PRETTIER CONFLICT: This rule conflicts with Prettier formatting
    "template-curly-spacing": "off",

    // enforce spacing around the * in yield* expressions
    // https://eslint.org/docs/rules/yield-star-spacing
    // PRETTIER CONFLICT: This rule conflicts with Prettier formatting
    "yield-star-spacing": "off",

    // New rules still not included
    "no-empty-static-block": "off",
    "no-new-native-nonconstructor": "off",
  },
};