.eslintrc.json

{
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": "tsconfig.json",
    "sourceType": "module"
  },
  "plugins": ["@typescript-eslint/eslint-plugin", "import", "unused-imports", "simple-import-sort"],
  "extends": ["plugin:@typescript-eslint/recommended", "plugin:prettier/recommended"],
  "root": true,
  "env": {
    "node": true,
    "jest": true
  },
  "ignorePatterns": [".eslintrc.json", "environment.prod.ts", "dist/**"],
  "rules": {
    /* Functions should always have a return type, even for void. */
    "@typescript-eslint/explicit-function-return-type": "error",
    /* An exported function should define the type of its arguments and return, even for void. */
    "@typescript-eslint/explicit-module-boundary-types": "error",
    /* Rules out the usage of 'any' type. */
    "@typescript-eslint/no-explicit-any": "error",
    /* Unuses variables are not allowed. */
    "@typescript-eslint/no-unused-vars": "error",
    /* Duplicate imports are not allowed. */
    "no-duplicate-imports": "error",
    /* Unused imports are not allowed. */
    "unused-imports/no-unused-imports": "error",
    /* If an if-block returns in all scenarios, then it should not have an else-block. */
    "no-else-return": "error",
    /* No assignments in the return statement. */
    "no-return-assign": "error",
    /* No await(s) in the return statement. */
    "no-return-await": "error",
    /* A 'return' that does not affect the flow in any way, is not allowed. */
    "no-useless-return": "error",
    /* Any callback functions should be arrow functions. */
    "prefer-arrow-callback": "error",
    /* If a variable is having no re-assignments then it should be const. */
    "prefer-const": "error",
    /* Destructuring should be followed wherever possible. */
    "prefer-destructuring": "error",
    /* Imports are sorted and grouped. */
    "simple-import-sort/imports": "error",
    /* Exports are sorted. */
    "simple-import-sort/exports": "error",
    /* Default sort-import mechanism of ESLint is disabled. */
    "sort-imports": "off",
    /* Allowing one new line after an import. */
    "import/newline-after-import": ["error", { "count": 1 }],
    /* No duplicate imports allowed. */
    "import/no-duplicates": "error",
    /* One space is put after semicolon. */
    "semi-spacing": ["error", { "before": false, "after": true }],
    /* All comment statements must have space before them. */
    "spaced-comment": ["error", "always"],
    /* Colon in a switch statement must be followed by a space. */
    "switch-colon-spacing": ["error", { "after": true, "before": false }],
    /* No spacing before/after the curly braces in a template string literal. */
    "template-curly-spacing": ["error", "never"],
    /* IIFE are wrapped. */
    "wrap-iife": ["error", "outside"],
    /* Regexes are wrapped. */
    "wrap-regex": "error",
    /* In a variable-literal comparison, the variable should come first. */
    "yoda": "error",
    /* There should be a new-line at the end of all files. */
    "eol-last": ["error", "always"],
    /* Only triple-equals will be used for comparisons. */
    "eqeqeq": ["error", "always"],
    /* No spacing in function call paranthesis. */
    "func-call-spacing": ["error", "never"],
    /* Functions should be declared as expressions. */
    "func-style": ["error", "expression"],
    /* Duplicate else-if not allowed. */
    "no-dupe-else-if": "error",
    /* Duplicate case not allowed. */
    "no-duplicate-case": "error",
    /* Extra semi-colon not allowed. */
    "no-extra-semi": "error",
    /* Absence of break statements in switch case is not allowed. */
    "no-fallthrough": "error",
    /* Assignment to an imported entity is not allowed. */
    "no-import-assign": "error"
  }
}