.eslintrc.json

{
  "root": true,
  "env": {
    "es6": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/eslint-recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:prettier/recommended",
    "prettier/@typescript-eslint",
    "plugin:import/errors",
    "plugin:import/warnings",
    "plugin:import/typescript"
  ],
  "globals": {
    "Atomics": "readonly",
    "SharedArrayBuffer": "readonly"
  },
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module"
  },
  "plugins": [
    "@typescript-eslint",
    "prettier",
    "import",
    "simple-import-sort"
  ],
  "settings": {
    "import/resolver": {
      "node": {
        "moduleDirectory": [
          "node_modules",
          "src"
        ]
      }
    }
  },
  "rules": {
    "prettier/prettier": "warn",
    "simple-import-sort/sort": ["warn", {
      "groups": [
        ["^test/(?!fixtures/)", "^test/fixtures/"],
        ["^\\u0000"],
        ["^(?!app/|lib/)@?\\w"],
        ["^[^.]"],
        ["^\\."]
      ]
    }],
    "import/first": "error",
    "import/newline-after-import": "warn",
    "@typescript-eslint/no-explicit-any": "off",
    "@typescript-eslint/camelcase": "off",
    "@typescript-eslint/no-unused-vars": ["error", {"argsIgnorePattern": "^_" }],
    "@typescript-eslint/member-ordering": ["warn", {
      "default": [
        "static-field",
        "instance-field",
        "static-method",
        "instance-method"
      ]
    }],
    "no-restricted-imports": ["error",
      {
        "name": "rxjs",
        "message": "importing from 'rxjs/Observable' for Observable."
      },
      {
        "name": "rxjs/Rx",
        "message": "importing from 'rxjs/Observable' for Observable."
      }
    ],
    "no-console": "error",
    "no-fallthrough": "error"
  },
  "overrides": [
    {
      "files": [
        "src/**/*.spec.ts"
      ],
      "rules": {
        "no-console": ["warn", {"allow": [
          "error",
          "info",
          "log",
          "trace",
          "warn"
        ]}],
        "@typescript-eslint/no-empty-function": "off"
      }
    },
    {
      "files": [
        "src/**/*.spec.ts"
      ],
      "rules": {
        "no-restricted-globals": ["error",
          {
            "name": "fdescribe",
            "message": "Do not commit fdescribe. Use describe instead."
          },
          {
            "name": "fit",
            "message": "Do not commit fit. Use describe instead."
          },
          {
            "name": "xdescribe",
            "message": "Do not commit xdescribe. Use describe instead."
          },
          {
            "name": "xit",
            "message": "Do not commit xit. Use describe instead."
          }
        ]
      }
    }
  ]
}

Using with angular 9.

Install packages.

npm un tslint
npm i -D eslint prettier eslint-config-prettier eslint-plugin-import eslint-plugin-prettier eslint-plugin-simple-import-sort @typescript-eslint/eslint-plugin @typescript-eslint/parser

Add run-scripts to package.json.

"scripts": {
  "lint": "eslint src --ext .ts",
  "format": "eslint src --ext .ts --fix",
},