Conversion of TSLint semicolon rule seems incorrect?

[rich-newman]

🐛 Bug Report

• tslint-to-eslint-config version: 2.9.2 (latest)
• ESLint version: Not installed
• Node version: 14.17.5

Actual Behavior

Migration of the TSLint semicolon rule enables ESLint's semi rule as well as @typescript-eslint/semi. This seems to be contrary to the docs for @typescript-eslint/semi, and leads to two errors reported for one missing semicolon when we lint with ESLint.

Expected Behavior

ESLint's semi rule should be off? I'm a little unsure if it is being set to error deliberately for some reason?

Reproduction

• Create tslint.json in a folder as below:

{
  "rules": {
    "semicolon": [ true, "always" ]
  }
}

• In the folder, install and run the converter: npm i tslint-to-eslint-config, npx tslint-to-eslint-config
• Resulting .eslintrc.js is below.

module.exports = {
    "env": {
        "browser": true,
        "es6": true,
        "node": true
    },
    "parser": "@typescript-eslint/parser",
    "parserOptions": {
        "project": "tsconfig.json",
        "sourceType": "module"
    },
    "plugins": [
        "@typescript-eslint"
    ],
    "rules": {
        "@typescript-eslint/member-delimiter-style": [
            "error",
            {
                "multiline": {
                    "delimiter": "semi",
                    "requireLast": true
                },
                "singleline": {
                    "delimiter": "semi",
                    "requireLast": false
                }
            }
        ],
        "@typescript-eslint/semi": [
            "error",
            "always"
        ],
        "semi": "error"
    }
};

[JoshuaKGoldberg]

Hmm, very weird! In the semicolon converter it specifically sets semi to ruleSeverity: "off":

tslint-to-eslint-config/src/converters/lintConfigs/rules/ruleConverters/semicolon.ts

Line 20 in 4a8adea

ruleSeverity: "off",

Something is spooky and should be fixed. Thanks for filing @rich-newman!

[JamesHenry]

I'm afraid this isn't fixed! I will open a new issue with a minimal reproduction