# Enforces naming conventions for class members by visibility. (member-naming)

It can be helpful to enforce naming conventions for `private` (and sometimes `protected`) members of an object. For example, prefixing private properties with a `_` allows them to be easily discerned when being inspected by tools that do not have knowledge of TypeScript (such as most debuggers).

## Rule Details

This rule allows you to enforce conventions for class property names by their visibility.  By default, it enforces nothing.

## Options

You can specify a regular expression to test the names of properties for each visibility level: `public`, `protected`, `private`.

Examples of **correct** code with `{ "private": "^_" }` specified:

```ts
class HappyClass {
    private _foo: string;
    private _bar = 123;
    private _fizz() {}
}
```

Examples of **incorrect** code with `{ "private": "^_" }` specified:

```ts
class SadClass {
    private foo: string;
    private bar = 123;
    private fizz() {}
}
```

## When Not To Use It

If you do not want to enforce per-visibility naming rules for member properties.

## Further Reading

* ESLint's [`camelcase` rule](https://eslint.org/docs/rules/camelcase)