---
title: "@typescript-eslint/prefer-literal-enum-member"
description: "Require enum values to be literals, not computed expressions"
# Generated by src/codegen/lint-rule-docs.ts. Do not edit below this line.
plugin: "typescript"
aliases: ["typescript-eslint/prefer-literal-enum-member","typescript/prefer-literal-enum-member"]
kind: "suggestion"
category: "restriction"
default: "off"
fixable: "no"
typeAware: false
deprecated: false
---

An enum value can be any expression, but then you need to evaluate it in your head to know what the member is. Names can also surprise you. Inside an enum, a name refers to another member before it refers to a variable outside, so `Max = limit` reads the member `limit` if there is one, not the `const limit` above the enum.

Strings, numbers, a `-` or `+` in front of a number, and template strings without `${}` are allowed. A member without a value isn't checked.

{/* Generated by src/codegen/lint-rule-docs.ts. Do not edit this section. */}

## Configure

Off by default. To turn it on:

```toml bunfig.toml
[lint.rules]
"@typescript-eslint/prefer-literal-enum-member" = "error" # or "warn"
```

Every option, set to its default:

```toml bunfig.toml
[lint.rules]
"@typescript-eslint/prefer-literal-enum-member" = ["error", {
  allowBitwiseExpressions = false,
}]
```

{/* End of the generated section. */}

## Examples

Reported:

{/* bad {"count": 3} */}
```ts
const prefix = "app";

enum Key {
  Session = `${prefix}:session`,
  Length = "session".length,
  Total = 1 + 2,
}
```

Not reported:

{/* good */}
```ts
enum Key {
  Session = "app:session",
  Length = 7,
  Offset = -1,
  Next,
}
```

## Options

| Option | Default | What it does |
| --- | --- | --- |
| `allowBitwiseExpressions` | `false` | Allow `\|`, `&`, `^`, `~`, `<<`, `>>`, and `>>>` on literals and on other members of the same enum. |

Flags are often written with shifts. Without the option, each of these is reported:

{/* bad {"count": 3} */}
```ts
enum Permission {
  Read = 1 << 0,
  Write = 1 << 1,
  All = Read | Write,
}
```

With `allowBitwiseExpressions: true`, none of them are reported:

{/* good {"options": [{"allowBitwiseExpressions": true}]} */}
```ts
enum Permission {
  Read = 1 << 0,
  Write = 1 << 1,
  All = Read | Write,
}
```

A variable from outside the enum is still reported:

{/* bad {"options": [{"allowBitwiseExpressions": true}]} */}
```ts
const base = 8;

enum Permission {
  Admin = base | 1,
}
```