.eslintrc.json

{
  "parser": "@typescript-eslint/parser",
  "ignorePatterns": [
    "/**/dist/**",
    "/node_modules/**",
    "/packages/*/test/**"
  ],
  "rules": {
    // eslint
    //--------------------------------------------------

    // Layout and formatting
    //

    "max-len": [
      "error",
      {
        "code": 160
      }
    ]
  },
  "overrides": [
    // JavaScript/TypeScript
    //--------------------------------------------------
    {
      "files": [
        "*.js",
        "*.ts"
      ],
      "excludedFiles": [
        "*.d.ts"
      ],
      "extends": [
        "eslint:recommended"
      ],
      "parserOptions": {
        "ecmaVersion": 2017,
        "sourceType": "module"
      },
      "env": {
        "browser": true,
        "es2017": true,
        "node": true
      },
      "rules": {
        // eslint
        //--------------------------------------------------

        // Possible problems
        //

        "array-callback-return": "error",
        //        "no-await-in-loop": "error",
        "no-constant-binary-expression": "error",
        "no-constructor-return": "error",
        //        "no-duplicate-imports": "error",
        "no-new-native-nonconstructor": "error",
        //        "no-promise-executor-return": "error",
        "no-self-compare": "error",
        "no-template-curly-in-string": "error",
        "no-unmodified-loop-condition": "error",
        "no-unreachable-loop": "error",
        "no-unused-private-class-members": "error",
        "no-unused-vars": [
          "error",
          {
            "argsIgnorePattern": "^_",
            "varsIgnorePattern": "^_",
            "caughtErrorsIgnorePattern": "^_"
          }
        ],
        "no-use-before-define": "error",
        "require-atomic-updates": "error",

        // Suggestions
        //

        "accessor-pairs": "error",
        "arrow-body-style": [
          "error",
          "as-needed"
        ],
        "block-scoped-var": "error",
        "camelcase": "error",
        //        "capitalized-comments": [
        //          "warn",
        //          "always",
        //          {
        //            "ignoreConsecutiveComments": true
        //          }
        //        ],
        "complexity": [
          "error",
          {
            "max": 8
          }
        ],
        "consistent-return": "error",
        "consistent-this": "error",
        "curly": "error",
        "default-case": "error",
        "default-case-last": "error",
        "default-param-last": "error",
        //        "dot-notation": "error",
        "eqeqeq": "error",
        "func-name-matching": "error",
        //        "func-names": "error",
        "func-style": "error",
        "grouped-accessor-pairs": "error",
        "guard-for-in": "error",
        //        "max-classes-per-file": [
        //          "error",
        //          1
        //        ],
        "max-depth": [
          "error",
          3
        ],
        //        "max-lines-per-function": [
        //          "error",
        //          {
        //            "max": 35
        //          }
        //        ],
        "max-nested-callbacks": [
          "error",
          2
        ],
        "max-params": [
          "error",
          10
        ],
        "max-statements": [
          "error",
          20
        ],
        //        "new-cap": "error",
        "no-alert": "error",
        "no-array-constructor": "error",
        "no-caller": "error",
        "no-case-declarations": "error",
        "no-confusing-arrow": "error",
        "no-console": "off",
        "no-delete-var": "error",
        //        "no-else-return": "error",
        "no-empty": "error",
        "no-empty-function": "error",
        "no-empty-static-block": "error",
        "no-eq-null": "error",
        "no-eval": "error",
        "no-extend-native": "error",
        "no-extra-bind": "error",
        "no-extra-boolean-cast": "off",
        "no-extra-label": "error",
        "no-extra-semi": "error",
        "no-floating-decimal": "error",
        "no-global-assign": "error",
        "no-implicit-coercion": "error",
        "no-implicit-globals": "error",
        "no-implied-eval": "error",
        //        "no-inline-comments": "error",
        "no-invalid-this": "error",
        "no-iterator": "error",
        "no-labels": "error",
        "no-lone-blocks": "error",
        "no-lonely-if": "error",
        "no-loop-func": "error",
        "no-mixed-operators": "error",
        "no-multi-assign": "error",
        "no-param-reassign": "error",
        "no-redeclare": "error",
        "no-return-assign": "error",
        "no-script-url": "error",
        "no-sequences": "error",
        //        "no-shadow": "error",
        "no-throw-literal": "error",
        "no-undef-init": "error",
        //        "no-undefined": "error",
        "no-unused-expressions": "error",
        "no-useless-call": "error",
        "no-useless-computed-key": "error",
        "no-useless-concat": "error",
        "no-useless-constructor": "error",
        "no-useless-rename": "error",
        "no-useless-return": "error",
        "no-var": "error",
        "no-void": "error",
        "no-with": "error",
        "prefer-const": "error",
        //        "prefer-destructuring": "error",
        "prefer-object-spread": "error",
        "prefer-rest-params": "error",
        "prefer-spread": "error",
        "prefer-template": "error",
        "require-await": "error",
        //        "sort-imports": [
        //          "error",
        //          {
        //            "ignoreCase": true,
        //            "ignoreDeclarationSort": true
        //          }
        //        ],
        //        "spaced-comment": "error",
        "strict": "error",
        "symbol-description": "error",

        // Layout and formatting
        //

        "array-bracket-spacing": [
          "error",
          "never"
        ],
        "array-element-newline": [
          "error",
          "consistent"
        ],
        "arrow-spacing": [
          "error",
          {
            "before": true,
            "after": true
          }
        ],
        "block-spacing": [
          "error",
          "never"
        ],
        "brace-style": "error",
        "comma-dangle": "error",
        "comma-spacing": [
          "error",
          {
            "before": false,
            "after": true
          }
        ],
        "comma-style": "error",
        "computed-property-spacing": "error",
        "dot-location": [
          "error",
          "property"
        ],
        "eol-last": "error",
        "func-call-spacing": "error",
        "function-call-argument-newline": [
          "error",
          "consistent"
        ],
        "generator-star-spacing": [
          "error",
          {
            "before": false,
            "after": true
          }
        ],
        //        "indent": [
        //          "error", 2, {
        //            "ignoredNodes": ["MemberExpression"]
        //          }
        //        ],
        // TODO: https://github.com/typescript-eslint/typescript-eslint/issues/7469
        //        "key-spacing": [
        //          "error",
        //          {
        //            "beforeColon": false,
        //            "afterColon": true,
        //            "mode": "strict"
        //          }
        //        ],
        "key-spacing": "off",
        //        "keyword-spacing": [
        //          "error",
        //          {
        //            "before": true,
        //            "after": false
        //          }
        //        ],
        //        "line-comment-position": "error",
        "linebreak-style": "error",
        //        "lines-between-class-members": "error",
        "max-statements-per-line": [
          "error",
          {
            "max": 1
          }
        ],
        "new-parens": "error",
        "newline-per-chained-call": "error",
        "no-mixed-spaces-and-tabs": "error",
        "no-multi-spaces": "error",
        "no-multiple-empty-lines": "error",
        "no-tabs": "error",
        "no-trailing-spaces": "error",
        "no-whitespace-before-property": "error",
        "object-curly-newline": [
          "error",
          {
            "ObjectExpression": {
              "consistent": true
            },
            "ObjectPattern": {
              "consistent": true
            },
            "ImportDeclaration": {
              "consistent": true
            },
            "ExportDeclaration": {
              "multiline": true,
              "minProperties": 1
            }
          }
        ],
        //        "object-property-newline": "error",
        "operator-linebreak": [
          "error",
          "before",
          {
            "overrides": {
              "?": "before",
              ":": "before"
            }
          }
        ],
        "padded-blocks": [
          "error",
          {
            "blocks": "never",
            "classes": "always",
            "switches": "never"
          }
        ],
        "padding-line-between-statements": [
          "error",
          {
            "blankLine": "always",
            "prev": "class",
            "next": "class"
          },
          {
            "blankLine": "always",
            "prev": "*",
            "next": "return"
          }
        ],
        "quotes": [
          "error",
          "single"
        ],
        "rest-spread-spacing": "error",
        "semi": "error",
        "semi-spacing": "error",
        "semi-style": "error",
        "space-before-blocks": [
          "error",
          {
            "functions": "always",
            "keywords": "always",
            "classes": "always"
          }
        ],
        "space-before-function-paren": [
          "error",
          "never"
        ],
        "space-in-parens": [
          "error",
          "never"
        ]
      }
    },

    // TypeScript
    //--------------------------------------------------
    {
      "files": [
        "*.ts"
      ],
      "excludedFiles": [
        "*.d.ts"
      ],
      "plugins": [
        "@typescript-eslint"
      ],
      "extends": [
        "plugin:@typescript-eslint/eslint-recommended"
      ],
      "parserOptions": {
        "project": "./tsconfig.eslint.json",
        "ecmaVersion": "latest",
        "sourceType": "module"
      },
      "rules": {
        // @typescript-eslint/eslint-plugin
        //--------------------------------------------------

        // Supported rules
        //

        "@typescript-eslint/adjacent-overload-signatures": "error",
        "@typescript-eslint/array-type": [
          "error",
          {
            "default": "array",
            "readonly": "generic"
          }
        ],
        "@typescript-eslint/ban-ts-comment": [
          "error",
          {
            "ts-expect-error": {
              "descriptionFormat": "^: TS\\d+ because .+$"
            },
            "ts-ignore": {
              "descriptionFormat": "^: TS\\d+ because .+$"
            },
            "ts-nocheck": {
              "descriptionFormat": "^: .+$"
            },
            "ts-check": {
              "descriptionFormat": "^: .+$"
            }
          }
        ],
        "@typescript-eslint/ban-tslint-comment": "error",
        "@typescript-eslint/class-literal-property-style": "error",
        //        "@typescript-eslint/consistent-generic-constructors": "error",
        "@typescript-eslint/consistent-indexed-object-style": "error",
        "@typescript-eslint/consistent-type-assertions": "error",
        "@typescript-eslint/consistent-type-definitions": [
          "error",
          "type"
        ],
        "@typescript-eslint/consistent-type-exports": "error",
        "@typescript-eslint/consistent-type-imports": "error",
        "@typescript-eslint/explicit-function-return-type": "error",
        "@typescript-eslint/explicit-member-accessibility": "error",
        //        "@typescript-eslint/explicit-package-boundary-types": "error",
        "@typescript-eslint/member-delimiter-style": [
          "error",
          {
            "overrides": {
              "interface": {
                "singleline": {
                  "delimiter": "semi",
                  "requireLast": false
                },
                "multiline": {
                  "delimiter": "semi",
                  "requireLast": true
                }
              },
              "typeLiteral": {
                "singleline": {
                  "delimiter": "comma",
                  "requireLast": false
                },
                "multiline": {
                  "delimiter": "comma",
                  "requireLast": false
                }
              }
            }
          }
        ],
        // TODO: "@typescript-eslint/member-ordering"
        "@typescript-eslint/method-signature-style": "off",
        // TODO: "@typescript-eslint/naming-convention"
        "@typescript-eslint/no-confusing-non-null-assertion": "error",
        "@typescript-eslint/no-confusing-void-expression": "error",
        "@typescript-eslint/no-dynamic-delete": "error",
        //        "@typescript-eslint/no-extraneous-class": "error",
        "@typescript-eslint/no-import-type-side-effects": "error",
        //        "@typescript-eslint/no-invalid-void-type": "error",
        "@typescript-eslint/no-meaningless-void-operator": "error",
        "@typescript-eslint/no-non-null-asserted-nullish-coalescing": "error",
        "@typescript-eslint/no-require-imports": "error",
        "@typescript-eslint/no-unnecessary-boolean-literal-compare": "error",
        "@typescript-eslint/no-unnecessary-condition": "error",
        "@typescript-eslint/no-unnecessary-qualifier": "error",
        "@typescript-eslint/no-unnecessary-type-arguments": "error",
        "@typescript-eslint/no-useless-empty-export": "error",
        "@typescript-eslint/prefer-readonly": "error",
        "@typescript-eslint/prefer-return-this-type": "error",
        //        "@typescript-eslint/prefer-ts-expect-error": "error",
        "@typescript-eslint/promise-function-async": "error",
        "@typescript-eslint/require-array-sort-compare": "error",
        //        "@typescript-eslint/strict-boolean-expressions": "error",
        "@typescript-eslint/switch-exhaustiveness-check": "error",
        "@typescript-eslint/type-annotation-spacing": "error",
        "@typescript-eslint/typedef": "error",

        // Extension rules
        //

        "block-spacing": "off",
        "@typescript-eslint/block-spacing": [
          "error",
          "never"
        ],
        "brace-style": "off",
        "@typescript-eslint/brace-style": "error",
        "comma-dangle": "off",
        "@typescript-eslint/comma-dangle": [
          "error",
          "never"
        ],
        "comma-spacing": "off",
        "@typescript-eslint/comma-spacing": [
          "error",
          {
            "before": false,
            "after": true
          }
        ],
        "default-param-last": "off",
        "@typescript-eslint/default-param-last": "error",
        //        "dot-notation": "off",
        //        "@typescript-eslint/dot-notation": "error",
        // TODO: ident.
        "key-spacing": "off",
        "@typescript-eslint/key-spacing": [
          "error",
          {
            "beforeColon": false,
            "afterColon": true,
            "mode": "strict"
          }
        ],
        //        "keyword-spacing": "off",
        //        "@typescript-eslint/keyword-spacing": [
        //          "error",
        //          {
        //            "before": true,
        //            "after": false
        //          }
        //        ],
        //        "lines-between-class-members": "off",
        //        "@typescript-eslint/lines-between-class-members": "error",
        "no-array-constructor": "off",
        "no-dupe-class-members": "off",
        "@typescript-eslint/no-dupe-class-members": "error",
        "no-empty-function": "off",
        "@typescript-eslint/no-empty-function": "error",
        "no-extra-semi": "off",
        "@typescript-eslint/no-extra-semi": "error",
        "no-implied-eval": "off",
        "no-invalid-this": "off",
        "@typescript-eslint/no-invalid-this": "error",
        "no-loop-func": "off",
        "@typescript-eslint/no-loop-func": "error",
        "no-loss-of-precision": "off",
        "no-redeclare": "off",
        "@typescript-eslint/no-redeclare": "error",
        //        "no-shadow": "off",
        //        "@typescript-eslint/no-shadow": "error",
        "no-throw-literal": "off",
        "@typescript-eslint/no-throw-literal": "error",
        "no-unused-expressions": "off",
        "@typescript-eslint/no-unused-expressions": "error",
        "no-unused-vars": "off",
        "no-use-before-define": "off",
        "@typescript-eslint/no-use-before-define": "error",
        "no-useless-constructor": "off",
        "@typescript-eslint/no-useless-constructor": "error",
        "padding-line-between-statements": "off",
        "@typescript-eslint/padding-line-between-statements": [
          "error",
          {
            "blankLine": "always",
            "prev": "class",
            "next": "class"
          },
          {
            "blankLine": "always",
            "prev": "*",
            "next": "return"
          }
        ],
        "quotes": "off",
        "@typescript-eslint/quotes": [
          "error",
          "single"
        ],
        "require-await": "off",
        "semi": "off",
        "@typescript-eslint/semi": "error",
        "space-before-blocks": "off",
        "@typescript-eslint/space-before-blocks": [
          "error",
          {
            "functions": "always",
            "keywords": "always",
            "classes": "always"
          }
        ],
        "space-before-function-paren": "off",
        "@typescript-eslint/space-before-function-paren": [
          "error",
          "never"
        ]

        // eslint-plugin-tsdoc
        //--------------------------------------------------

        // TODO: https://github.com/microsoft/tsdoc/issues/366.
        //        "tsdoc/syntax": "error"
      }
    }
  ]
}