.eslintrc.json

{
	"root": true,
	"env": {
		"es2021": true,
		"node": true
	},
	"extends": [
		"airbnb-base",
		"plugin:@typescript-eslint/eslint-recommended",
		"plugin:@typescript-eslint/recommended",
		"plugin:import/errors",
		"plugin:import/warnings",
		"plugin:import/typescript",
		"prettier"
	],
	"parser": "@typescript-eslint/parser",
	"parserOptions": {
		"project": "tsconfig.json",
		"ecmaVersion": "latest",
		"ecmaFeatures": {"modules": true, "templateStrings": true},
		"sourceType": "module",
		"createDefaultProgram": true
	},
	"plugins": [
		"@typescript-eslint",
		"@typescript-eslint/eslint-plugin",
		"prettier"
	],
	"settings": {
		"import/resolver": {
			"typescript": {} // this loads <rootdir>/tsconfig.json to eslint
		}
	},
	"rules": {
		"prettier/prettier": [
			"error",
			{
				"singleQuote": false,
				"bracketSameLine": false,
				"endOfLine": "auto"
			}
		],

		"no-use-before-define": [
			"error",
			{"functions": true, "classes": true, "variables": true}
		],
		"@typescript-eslint/no-use-before-define": ["error"],

		"quotes": ["error", "double", {"allowTemplateLiterals": true}],

		"semi": ["error", "always"],

		"indent": [
			"error",
			"tab",
			{
				"SwitchCase": 1
			}
		],

		"no-tabs": [
			"error",
			{
				"allowIndentationTabs": true
			}
		],

		"comma-dangle": "off",

		"no-shadow": "off",

		"no-console": "off",

		"arrow-parens": ["error", "always"],
		"arrow-body-style": ["error", "always"],
		"spaced-comment": [0, "always"],

		"import/extensions": [
			"error",
			"never",
			{
				"js": "never",
				"jsx": "never",
				"ts": "never",
				"tsx": "never",
				"json": "always"
			}
		],

		"import/prefer-default-export": "off",

		"class-methods-use-this": "off",

		// disabled because typescript has already its own checks
		// refer: https://stackoverflow.com/a/64197516
		"no-undef": "off",

		// this rule has been enabled specifically for TypeScript files. See the "overrides" section
		// for details
		"@typescript-eslint/explicit-function-return-type": "off",

		// this rule has been enabled specifically for TypeScript files. See the "overrides" section
		// for details
		"@typescript-eslint/explicit-module-boundary-types": "off",

		"@typescript-eslint/no-explicit-any": [
			"error",
			{
				"fixToUnknown": false,
				"ignoreRestArgs": false
			}
		],

		// turned off as we're using @typescript-eslint/no-unused-vars.
		// For more details: https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/docs/rules/no-unused-vars.md#how-to-use
		"no-unused-vars": "off",
		"@typescript-eslint/no-unused-vars": [
			"error",
			{
				"vars": "all",
				"args": "after-used",
				"ignoreRestSiblings": false,
				"argsIgnorePattern": "next"
			}
		],

		"@typescript-eslint/ban-types": "off",

		"@typescript-eslint/naming-convention": [
			"error",
			// Enforce that all variables, functions and properties follow are camelCase
			// See: https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/docs/rules/naming-convention.md#enforce-that-all-variables-functions-and-properties-follow-are-camelcase
			{"selector": "variableLike", "format": ["camelCase"]},

			// Enforce that boolean variables are prefixed with an allowed verb
			// See: https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/docs/rules/naming-convention.md#enforce-that-boolean-variables-are-prefixed-with-an-allowed-verb
			{
				"selector": "variable",
				"types": ["boolean"],
				"format": ["PascalCase"],
				"prefix": ["is", "should", "has", "can", "did", "will"]
			},

			// Enforce that all const variables are either in UPPER_CASE, or PascalCase or camelCase
			{
				"selector": "variable",
				"modifiers": ["const"],
				"format": ["UPPER_CASE", "PascalCase", "camelCase"]
			},

			// Enforce that all functions are either in PascalCase or camelCase
			{
				"selector": "function",
				"format": ["PascalCase", "camelCase"]
			},

			// Enforce that interface names begin with an i
			// See: https://stackoverflow.com/a/62915767/6793156
			{
				"selector": "interface",
				"format": ["camelCase"],
				"custom": {
					"regex": "^i[A-Z]",
					"match": true
				}
			}
		]
	},
	"overrides": [
		{
			"files": ["*.ts", "*.tsx"],
			"rules": {
				"@typescript-eslint/no-shadow": ["error"],
				"no-shadow": "off",
				"no-undef": "off"
			}
		},
		{
			// enable the rule specifically for TypeScript files
			"files": ["*.ts", "*.tsx"],
			"rules": {
				"@typescript-eslint/explicit-module-boundary-types": ["error"]
			}
		},
		{
			// enable the rule specifically for TypeScript files
			"files": ["*.ts", "*.tsx"],
			"rules": {
				"@typescript-eslint/explicit-function-return-type": ["error"]
			}
		},
		{
			// specifically disable particular rules for certain files.
			"files": ["./src/db/index.ts"],
			"rules": {
				"no-param-reassign": ["off"],
				"no-use-before-define": ["off"],
				"@typescript-eslint/no-use-before-define": ["off"]
			}
		},
		{
			// specifically disable particular rules for certain files.
			"files": ["./src/db/repositories/*"],
			"rules": {
				"no-useless-constructor": ["off"]
			}
		}
	]
}