[quotemark] backticks break lookup types / use strict / octal escape sequences / enum members

[ericbf]

Bug Report

• TSLint version: 5.16.0
• TypeScript version: 3.4.2
• Running TSLint via: Atom

TypeScript code being linted

"use strict"

enum Hello {
    "world",
    "foo"
}

function hi() {
    "use strict"
}

type hello = typeof obj["key"]
type hello2 = InterfaceName["key"]

const octal = "\110\151"

with tslint.json configuration:

{
    "rules": {
        "quotemark": [true, "backtick"]
    }
}

Actual behavior

All the strings in the example are flagged, even though they must remain as single/double quotes in order to compile or otherwise behave correctly.

Expected behavior

None of the strings in the example are flagged.