.eslintrc.json

{
    "root": true,
    "plugins": ["@typescript-eslint", "mocha", "chai-expect"],
    "extends": [
        "airbnb-typescript/base",
        "plugin:@typescript-eslint/recommended",
        "plugin:@typescript-eslint/recommended-requiring-type-checking",
        "plugin:eslint-comments/recommended",
        "plugin:mocha/recommended",
        "plugin:prettier/recommended",
        "plugin:chai-expect/recommended"
    ],
    "parserOptions": {
        "project": "./tsconfig.json"
    },
    "env": {
        "node": true,
        "browser": true,
        "mocha": true
    },
    "rules": {
        // Allow most functions to rely on type inference. If the function is exported, then `@typescript-eslint/explicit-module-boundary-types` will ensure it's typed.
        "@typescript-eslint/explicit-function-return-type": "off",
        "@typescript-eslint/no-use-before-define": [
            "error",
            {
                "functions": false,
                "classes": true,
                "variables": true,
                "typedefs": true
            }
        ],
        "@typescript-eslint/restrict-template-expressions": [
            "error",
            {
                "allowNumber": true,
                "allowNullish": true
            }
        ]
    },
    "overrides": [
        {
            "files": ["*.test.ts", "*.spec.ts"],
            "rules": {
                "@typescript-eslint/no-unused-expressions": "off",
                "func-names": "off",
                "prefer-arrow-callback": "off"
            }
        }
    ]
}