# Source: https://oxc.rs/docs/guide/usage/linter/rules/import/no-duplicates.md

---
url: /docs/guide/usage/linter/rules/import/no-duplicates.md
---

### What it does

Reports if a resolved path is imported more than once in the same module.
This helps avoid unnecessary duplicate imports and keeps the code clean.

### Why is this bad?

Importing the same module multiple times can lead to redundancy and
unnecessary complexity. It also affects maintainability, as it might
confuse developers and result in inconsistent usage of imports across the code.

### Examples

Examples of **incorrect** code for this rule:

```javascript
import { foo } from "./module";
import { bar } from "./module";

import a from "./module";
import { b } from "./module";
```

Examples of **correct** code for this rule:

```typescript
import { foo, bar } from "./module";

import * as a from "foo"; // separate statements for namespace imports
import { b } from "foo";

import { c } from "foo"; // separate type imports, unless
import type { d } from "foo"; // `prefer-inline` is true
```

## Configuration

This rule accepts a configuration object with the following properties:

### considerQueryString

type: `boolean`

default: `false`

When set to `true`, the rule will consider the query string part of the import path
when determining if imports are duplicates. This is useful when using loaders like
webpack that use query strings to configure how a module should be loaded.

Examples of **correct** code with this option set to `true`:

```javascript
import x from "./bar?optionX";
import y from "./bar?optionY";
```

### preferInline

type: `boolean`

default: `false`

When set to `true`, prefer inline type imports instead of separate type import
statements for TypeScript code.

Examples of **correct** code with this option set to `true`:

```typescript
import { Foo, type Bar } from "./module";
```

## How to use

To **enable** this rule using the config file or in the CLI, you can use:

::: code-group

```json [Config (.oxlintrc.json)]
{
  "plugins": ["import"],
  "rules": {
    "import/no-duplicates": "error"
  }
}
```

```bash [CLI]
oxlint --deny import/no-duplicates --import-plugin
```

:::

## References

* Rule Source