140 lines
4.8 KiB
Markdown
140 lines
4.8 KiB
Markdown
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# import/no-extraneous-dependencies
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<!-- end auto-generated rule header -->
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Forbid the import of external modules that are not declared in the `package.json`'s `dependencies`, `devDependencies`, `optionalDependencies`, `peerDependencies`, or `bundledDependencies`.
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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`. Normally ignores imports of modules marked internal, but this can be changed with the rule option `includeInternal`. Type imports can be verified by specifying `includeTypes`.
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Modules have to be installed for this rule to work.
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## Options
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This rule supports the following options:
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`devDependencies`: If set to `false`, then the rule will show an error when `devDependencies` are imported. Defaults to `true`.
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Type imports are ignored by default.
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`optionalDependencies`: If set to `false`, then the rule will show an error when `optionalDependencies` are imported. Defaults to `true`.
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`peerDependencies`: If set to `false`, then the rule will show an error when `peerDependencies` are imported. Defaults to `true`.
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`bundledDependencies`: If set to `false`, then the rule will show an error when `bundledDependencies` are imported. Defaults to `true`.
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You can set the options like this:
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```js
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"import/no-extraneous-dependencies": ["error", {"devDependencies": false, "optionalDependencies": false, "peerDependencies": false}]
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```
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You can also use an array of globs instead of literal booleans:
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```js
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"import/no-extraneous-dependencies": ["error", {"devDependencies": ["**/*.test.js", "**/*.spec.js"]}]
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```
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When using an array of globs, the setting will be set to `true` (no errors reported) if the name of the file being linted (i.e. not the imported file/module) matches a single glob in the array, and `false` otherwise.
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There are 2 boolean options to opt into checking extra imports that are normally ignored: `includeInternal`, which enables the checking of internal modules, and `includeTypes`, which enables checking of type imports in TypeScript.
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```js
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"import/no-extraneous-dependencies": ["error", {"includeInternal": true, "includeTypes": true}]
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```
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Also there is one more option called `packageDir`, this option is to specify the path to the folder containing package.json.
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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.
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```js
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"import/no-extraneous-dependencies": ["error", {"packageDir": './some-dir/'}]
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// or
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"import/no-extraneous-dependencies": ["error", {"packageDir": path.join(__dirname, 'some-dir')}]
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```
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It may also be an array of multiple paths, to support monorepos or other novel project
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folder layouts:
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```js
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"import/no-extraneous-dependencies": ["error", {"packageDir": ['./some-dir/', './root-pkg']}]
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```
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## Rule Details
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Given the following `package.json`:
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```json
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{
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"name": "my-project",
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"...": "...",
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"dependencies": {
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"builtin-modules": "^1.1.1",
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"lodash.cond": "^4.2.0",
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"lodash.find": "^4.2.0",
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"pkg-up": "^1.0.0"
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},
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"devDependencies": {
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"ava": "^0.13.0",
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"eslint": "^2.4.0",
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"eslint-plugin-ava": "^1.3.0",
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"xo": "^0.13.0"
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},
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"optionalDependencies": {
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"lodash.isarray": "^4.0.0"
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},
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"peerDependencies": {
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"react": ">=15.0.0 <16.0.0"
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},
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"bundledDependencies": [
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"@generated/foo",
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]
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}
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```
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## Fail
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```js
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var _ = require('lodash');
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import _ from 'lodash';
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import react from 'react';
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/* eslint import/no-extraneous-dependencies: ["error", {"devDependencies": false}] */
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import test from 'ava';
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var test = require('ava');
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/* eslint import/no-extraneous-dependencies: ["error", {"optionalDependencies": false}] */
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import isArray from 'lodash.isarray';
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var isArray = require('lodash.isarray');
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/* eslint import/no-extraneous-dependencies: ["error", {"bundledDependencies": false}] */
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import foo from '"@generated/foo"';
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var foo = require('"@generated/foo"');
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/* eslint import/no-extraneous-dependencies: ["error", {"includeInternal": true}] */
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import foo from './foo';
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var foo = require('./foo');
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/* eslint import/no-extraneous-dependencies: ["error", {"includeTypes": true}] */
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import type { MyType } from 'foo';
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```
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## Pass
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```js
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// Builtin and internal modules are fine
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var path = require('path');
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var foo = require('./foo');
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import test from 'ava';
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import find from 'lodash.find';
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import isArray from 'lodash.isarray';
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import foo from '"@generated/foo"';
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import type { MyType } from 'foo';
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/* eslint import/no-extraneous-dependencies: ["error", {"peerDependencies": true}] */
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import react from 'react';
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```
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## When Not To Use It
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If you do not have a `package.json` file in your project.
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