.eslintrc.json

{
    "root": true,
    "parser": "@typescript-eslint/parser",
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
        "project": "tsconfig.json"
    },
    "plugins": [
        "@typescript-eslint"
    ],
    "rules": {
        "@typescript-eslint/naming-convention": [ // Naming is enforced with some exceptions below
            "warn",
            { // Names should be either camelCase or PascalCase, both are extensively used throughout this project
                "selector": "default",
                "format": [
                    "camelCase",
                    "PascalCase"
                ]
            },
            { // const variables can also have UPPER_CASE
                "selector": "variable",
                "modifiers": [
                    "const"
                ],
                "format": [
                    "camelCase",
                    "PascalCase",
                    "UPPER_CASE"
                ]
            },
            { // private class properties can also have leading _underscores
                "selector": "classProperty",
                "modifiers": [
                    "private"
                ],
                "format": [
                    "camelCase",
                    "PascalCase"
                ],
                "leadingUnderscore": "allow"
            }
        ],
        "@typescript-eslint/no-floating-promises": "warn", // Floating promises are bad, should do `void thePromise()`
        "@typescript-eslint/no-inferrable-types": "off", // This gets upset about e.g. `const foo: string = 'bar'` because it's obvious that it's a string; it doesn't matter enough to enforce
        "@typescript-eslint/no-unused-vars": [ // Unused variables aren't allowed, with an exception (below)
            "warn",
            { // As a function parameter, unused parameters are allowed
                "args": "none"
            }
        ],
        "@typescript-eslint/semi": "warn", // Elevate this to warning, we like semicolons
        "curly": "warn", // May have been a mistake to include a `{curly}` inside a template string, you might mean `${curly}`
        "eqeqeq": "warn", // Should use `===`, not `==`, nearly 100% of the time
        "no-extra-boolean-cast": "off", // We !!flatten a lot of things into booleans this way
        "no-throw-literal": "warn", // Elevate this from suggestion to warning
        "semi": "off" // Covered by @typescript-eslint/semi
    },
    "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended"
    ]
}