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# import/no-extraneous-dependencies: Forbid the use of extraneous packages
Forbid the import of external modules that are not declared in the `package.json`'s `dependencies`, `devDependencies`, `optionalDependencies`, `peerDependencies`, or `bundledDependencies`.
The closest parent `package.json` will be used. If no `package.json` is found, the rule will not lint anything. This behavior can be changed with the rule option `packageDir`.
Modules have to be installed for this rule to work.
### Options
This rule supports the following options:
`devDependencies`: If set to `false`, then the rule will show an error when `devDependencies` are imported. Defaults to `true`.
`optionalDependencies`: If set to `false`, then the rule will show an error when `optionalDependencies` are imported. Defaults to `true`.
`peerDependencies`: If set to `false`, then the rule will show an error when `peerDependencies` are imported. Defaults to `true`.
`bundledDependencies`: If set to `false`, then the rule will show an error when `bundledDependencies` are imported. Defaults to `true`.
You can set the options like this:
```js
"import/no-extraneous-dependencies": ["error", {"devDependencies": false, "optionalDependencies": false, "peerDependencies": false}]
```
You can also use an array of globs instead of literal booleans:
```js
"import/no-extraneous-dependencies": ["error", {"devDependencies": ["**/*.test.js", "**/*.spec.js"]}]
```
When using an array of globs, the setting will be set to `true` (no errors reported) if the name of the file being linted matches a single glob in the array, and `false` otherwise.
Also there is one more option called `packageDir`, this option is to specify the path to the folder containing package.json.
If provided as a relative path string, will be computed relative to the current working directory at linter execution time. If this is not ideal (does not work with some editor integrations), consider using `__dirname` to provide a path relative to your configuration.
```js
"import/no-extraneous-dependencies": ["error", {"packageDir": './some-dir/'}]
// or
"import/no-extraneous-dependencies": ["error", {"packageDir": path.join(__dirname, 'some-dir')}]
```
It may also be an array of multiple paths, to support monorepos or other novel project
folder layouts:
```js
"import/no-extraneous-dependencies": ["error", {"packageDir": ['./some-dir/', './root-pkg']}]
```
## Rule Details
Given the following `package.json`:
```json
{
"name": "my-project",
"...": "...",
"dependencies": {
"builtin-modules": "^1.1.1",
"lodash.cond": "^4.2.0",
"lodash.find": "^4.2.0",
"pkg-up": "^1.0.0"
},
"devDependencies": {
"ava": "^0.13.0",
"eslint": "^2.4.0",
"eslint-plugin-ava": "^1.3.0",
"xo": "^0.13.0"
},
"optionalDependencies": {
"lodash.isarray": "^4.0.0"
},
"peerDependencies": {
"react": ">=15.0.0 <16.0.0"
},
"bundledDependencies": [
"@generated/foo",
]
}
```
## Fail
```js
var _ = require('lodash');
import _ from 'lodash';
import react from 'react';
/* eslint import/no-extraneous-dependencies: ["error", {"devDependencies": false}] */
import test from 'ava';
var test = require('ava');
/* eslint import/no-extraneous-dependencies: ["error", {"optionalDependencies": false}] */
import isArray from 'lodash.isarray';
var isArray = require('lodash.isarray');
/* eslint import/no-extraneous-dependencies: ["error", {"bundledDependencies": false}] */
import foo from '"@generated/foo"';
var foo = require('"@generated/foo"');
```
## Pass
```js
// Builtin and internal modules are fine
var path = require('path');
var foo = require('./foo');
import test from 'ava';
import find from 'lodash.find';
import isArray from 'lodash.isarray';
import foo from '"@generated/foo"';
/* eslint import/no-extraneous-dependencies: ["error", {"peerDependencies": true}] */
import react from 'react';
```
## When Not To Use It
If you do not have a `package.json` file in your project.
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