@serverless-guru/prettier-plugin-import-order NPM

@serverless-guru/prettier-plugin-import-order

A prettier plugin to sort import declarations by provided regular expression order.

Sample

Input

// prettier-ignore
import { environment } from "./misguided-module-with-side-effects.js";

import 'core-js/another-side-effect-module';
import React, {
    FC,
    useEffect,
    useRef,
    ChangeEvent,
    KeyboardEvent,
} from 'react';
import { logger } from '@core/logger';
import { reduce, debounce } from 'lodash';
import { Message } from '../Message';
import { createServer } from '@server/node';
import { Alert } from '@ui/Alert';
import { repeat, filter, add } from '../utils';
import type { Params } from './func';
import { initializeApp } from '@core/app';
import { Popup } from '@ui/Popup';
import { createConnection } from '@server/database';

import type { Window } from 'document';

Output

// prettier-ignore
import { environment } from "./misguided-module-with-side-effects.js";
import 'core-js/another-side-effect-module';

import type { Window } from 'document';
import type { Params } from './func';

import { debounce, reduce } from 'lodash';
import React, {
    ChangeEvent,
    FC,
    KeyboardEvent,
    useEffect,
    useRef,
} from 'react';

import { createConnection } from '@server/database';
import { createServer } from '@server/node';

import { initializeApp } from '@core/app';
import { logger } from '@core/logger';

import { Alert } from '@ui/Alert';
import { Popup } from '@ui/Popup';

import { Message } from '../Message';
import { add, filter, repeat } from '../utils';

Install

npm install @serverless-guru/prettier-plugin-import-order --save-dev

yarn add @serverless-guru/prettier-plugin-import-order -D

Usage

Add your preferred settings in your prettier config file.

// @ts-check

/** @type {import("@serverless-guru/prettier-plugin-import-order").PrettierConfig} */
{
    "importOrder": ["^@core/(.*)$", "^@server/(.*)$", "^@ui/(.*)$", "^[./]"],
    "importOrderTypeImportsToTop": true,
    "importOrderTypeImportsToBottom": false,
    "importOrderBuiltinModulesToTop": true,
    "importOrderCaseInsensitive": false,
    "importOrderParserPlugins": ["typescript", "jsx", "decorators-legacy"],
    "importOrderMergeDuplicateImports": true,
    "importOrderSeparation": true,
    "importOrderSortIndividualImports": true,
}

Note: all flags are off by default, so explore your options below

You can use the following command from the root of your project to run prettier across all matching files.

npx prettier --write '**/*.{ts,tsx,jsx,js,css,html}'

APIs

Prevent imports from being sorted

This plugin supports standard prettier ignore comments. By default, side-effect imports (like import "core-js/stable";) are not sorted, so in most cases things should just work. But if you ever need to, you can prevent an import from getting sorted like this:

// prettier-ignore
import { goods } from "zealand";

import { cars } from 'austria';

This will keep the zealand import at the top instead of moving it below the austria import. Note that since only entire import statements can be ignored, line comments (// prettier-ignore) are recommended over inline comments (/* prettier-ignore */).

`importOrder`

type: Array<string>

A collection of Regular expressions in string format.

"importOrder": ["^@core/(.*)$", "^@server/(.*)$", "^@ui/(.*)$", "^[./]"],

Default: []

By default, this plugin will not move any imports. To separate third party from relative imports, use ["^[./]"]. This will become the default in the next major version.

The plugin moves the third party imports to the top which are not part of the importOrder list. To move the third party imports at desired place, you can use <THIRD_PARTY_MODULES> to assign third party imports to the appropriate position:

"importOrder": ["^@core/(.*)$", "<THIRD_PARTY_MODULES>", "^@server/(.*)$", "^@ui/(.*)$", "^[./]"],

`importOrderSeparation`

type: boolean

default value: false

A boolean value to enable or disable the new line separation between sorted import declarations group. The separation takes place according to the importOrder.

"importOrderSeparation": true,

Note: If you want greater control over which groups are separated from others, you can add an empty string to your importOrder array to signify newlines. For example:

"importOrderSeparation": false,
"importOrder": [
   "^react", // React will be placed at the top of third-party modules
    "<THIRD_PARTY_MODULES>",
    "",  // use empty strings to separate groups with empty lines
    "^[./]"
],

`importOrderSortIndividualImports`

type: boolean

default value: false

A boolean value to enable or disable sorting of the objects in an import declarations.

import c, a, b from 'd';

// to

import a, b, c from 'd';

`importOrderNamespaceImportsToGroupTop`

type: boolean

default value: false

A boolean value to enable or disable sorting the namespace imports to the top of the import group.

Namespace imports look like import * as mynamespace from 'module';

`importOrderCaseInsensitive`

type: boolean

default value: false

A boolean value to enable case-insensitivity in the sorting algorithm used to order imports within each match group.

For example, when false (or not specified):

import ExampleView from './ExampleView';
import ExamplesList from './ExamplesList';

compared with "importOrderCaseInsensitive": true:

import ExampleView from './ExampleView';
import ExamplesList from './ExamplesList';

`importOrderMergeDuplicateImports`

type: boolean

default value: false

When true, multiple import statements from the same module will be combined into a single import.

`importOrderParserPlugins`

type: Array<string>

default value: ["typescript", "jsx"]

Previously known as experimentalBabelParserPluginsList.

A collection of plugins for babel parser. The plugin passes this list to babel parser, so it can understand the syntaxes used in the file being formatted. The plugin uses prettier itself to figure out the parser it needs to use but if that fails, you can use this field to enforce the usage of the plugins' babel parser needs.

To pass the plugins to babel parser:

  "importOrderParserPlugins" : ["classProperties", "decorators-legacy"]

To pass the options to the babel parser plugins: Since prettier options are limited to string, you can pass plugins with options as a JSON string of the plugin array: "[\"plugin-name\", { \"pluginOption\": true }]".

  "importOrderParserPlugins" : ["classProperties", "[\"decorators\", { \"decoratorsBeforeExport\": true }]"]

To disable default plugins for babel parser, pass an empty array:

"importOrderParserPlugins": []

`importOrderBuiltinModulesToTop`

type: boolean

default value: false

A boolean value to enable sorting of node builtins to the top of all import groups.

`importOrderTypeImportsToTop`

type: boolean

default value: false

A boolean value to enable sorting of type imports to the top of all import groups. Even higher than builtin modules if that setting is on.

`importOrderTypeImportsToBottom`

type: boolean

default value: false

A boolean value to enable sorting of type imports to the bottom of all import groups.

How does import sort work?

The plugin extracts the imports which are defined in importOrder. These imports are considered as local imports. The imports which are not part of the importOrder is considered as third party imports.

First, the plugin checks for side effect imports, such as import 'mock-fs'. These imports often modify the global scope or apply some patches to the current environment, which may affect other imports. To preserve potential side effects, these kind of side effect imports are classified as unsortable. They also behave as a barrier that other imports may not cross during the sort. So for example, let's say you've got these imports:

import D from 'd';
import E from 'e';
import F from 'f';

import 'c';

import A from 'a';
import B from 'b';

Then the first three imports are sorted and the last two imports are sorted, but all imports above c stay above c and all imports below c stay below c, resulting in:

import D from 'd';
import E from 'e';
import F from 'f';

import 'c';

import A from 'a';
import B from 'b';

Additionally, any import statements lines that are preceded by a // prettier-ignore comment are also classified as unsortable. This can be used for edge-cases, such as when you have a named import with side-effects.

Next, the plugin sorts the local imports and third party imports using natural sort algorithm.

In the end, the plugin returns final imports with third party imports on top and local imports at the end.

The third party imports position (it's top by default) can be overridden using the <THIRD_PARTY_MODULES> special word in the importOrder.

FAQ / Troubleshooting

Having some trouble or an issue? You can check FAQ / Troubleshooting section.

Compatibility

Framework	Supported	Note
JS with ES Modules	✅ Everything	-
NodeJS with ES Modules	✅ Everything	-
React	✅ Everything	-
Angular	✅ Everything	Supported through `importOrderParserPlugins` API
Vue	✅ Everything	Peer dependency `@vue/compiler-sfc` is required

Contribution

For more information regarding contribution, please check the Contributing Guidelines. If you are trying to debug some code in the plugin, check Debugging Guidelines