import-style.md

Enforce specific import styles per module

✅ This rule is part of the recommended config.

Sometimes a module contains unrelated functions, like util, thus it is a good practice to enforce destructuring or named imports here. Other times, in modules like path, it is good to use default import as they have similar functions, all likely to be utilized.

This rule defines 4 import styles:

• unassigned - import 'foo' or require('foo')
• default - import path from 'path' or const path = require('path')
• namespace - import * as path from 'path' or const path = require('path')
• named - import {inspect} from 'util' or const {inspect} = require('util')

Fail

const util = require('util');

import util from 'util';

import * as util from 'util';

Pass

const {promisify} = require('util');

import {promisify} from 'util';

Options

styles

Type: object

You can extend default import styles per module by passing the styles option.

Default options per module are:

• util - named only
• path - default only
• chalk - default only

The example below:

• Disables any restrictions on the util module imports.
• Allows named import (leaving default allowed too) from the path module (by default only default import of path is allowed).

"unicorn/import-style": [
	"error",
	{
		"styles": {
			"util": false,
			"path": {
				"named": true
			}
		}
	}
]

extendDefaultStyles

Type: boolean
Default: true

Pass "extendDefaultStyles": false to override the default styles option completely.

checkImport

Type: boolean
Default: true

Pass "checkImport": false to disable linting of static import statements (like import ... from 'foo' or import 'foo') completely.

checkDynamicImport

Type: boolean
Default: true

Pass "checkDynamicImport": false to disable linting of dynamic import statements (like await import('foo')) completely.

checkExportFrom

Type: boolean
Default: false

Pass "checkExportFrom": true to enable linting of export-from statements (like export ... from 'foo').

checkRequire

Type: boolean
Default: true

Pass "checkRequire": false to disable linting of require calls completely.