tslint.json

{
  "extends": ["./tslint.angularcli.json", "tslint-config-prettier"],
  "rules": {
    // the same as tslint:recommended, but without "Function"
    "ban-types": {
      "options": [
        ["Object", "Avoid using the `Object` type. Did you mean `object`?"],
        ["Boolean", "Avoid using the `Boolean` type. Did you mean `boolean`?"],
        ["Number", "Avoid using the `Number` type. Did you mean `number`?"],
        ["String", "Avoid using the `String` type. Did you mean `string`?"],
        ["Symbol", "Avoid using the `Symbol` type. Did you mean `symbol`?"]
      ]
    },
    "no-any": { "severity": "warning" },
    "no-non-null-assertion": { "severity": "warning" },
    // the same as tslint:recommended, but with "allow-leading-underscore"
    "variable-name": {
      "options": [
        "ban-keywords",
        "check-format",
        "allow-pascal-case",
        "allow-leading-underscore"
      ]
    }
  }
}