---
url: /docs/guide/usage/linter/rules/node/no-path-concat.md
---

### What it does

Disallows string concatenation with `__dirname` and `__filename`.

### Why is this bad?

In Node.js, the `__dirname` and `__filename` global variables contain the directory path and the file path of the currently executing script file, respectively.
Sometimes, developers try to use these variables to create paths to other files, such as:

```js
var fullPath = __dirname + "/foo.js";
```

However, this is error-prone because it doesn't account for different
operating systems, which use different path separators. Using `path.join()`
or `path.resolve()` is the proper way to create cross-platform file paths.

### Examples

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

```js
const fullPath1 = __dirname + "/foo.js";
const fullPath2 = __filename + "/foo.js";
const fullPath3 = `${__dirname}/foo.js`;
const fullPath4 = `${__filename}/foo.js`;
```

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

```js
const fullPath1 = path.join(__dirname, "foo.js");
const fullPath2 = path.join(__filename, "foo.js");
const fullPath3 = __dirname + ".js";
const fullPath4 = __filename + ".map";
const fullPath5 = `${__dirname}_foo.js`;
const fullPath6 = `${__filename}.test.js`;
```

## How to use

## Version

This rule was added in v1.49.0.

## References