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# import/no-mutable-exports
Forbids the use of mutable exports with `var` or `let`.
## Rule Details
Valid:
```js
export const count = 1
export function getCount() {}
export class Counter {}
```
...whereas here exports will be reported:
```js
export let count = 2
export var count = 3
let count = 4
export { count } // reported here
```
## Functions/Classes
Note that exported function/class declaration identifiers may be reassigned,
but are not flagged by this rule at this time. They may be in the future, if a
reassignment is detected, i.e.
```js
// possible future behavior!
export class Counter {} // reported here: exported class is reassigned on line [x].
Counter = KitchenSink // not reported here unless you enable no-class-assign
// this pre-declaration reassignment is valid on account of function hoisting
getCount = function getDuke() {} // not reported here without no-func-assign
export function getCount() {} // reported here: exported function is reassigned on line [x].
```
To prevent general reassignment of these identifiers, exported or not, you may
want to enable the following core ESLint rules:
- [no-func-assign]
- [no-class-assign]
[no-func-assign]: https://eslint.org/docs/rules/no-func-assign
[no-class-assign]: https://eslint.org/docs/rules/no-class-assign
## When Not To Use It
If your environment correctly implements mutable export bindings.
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