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https://github.com/webpack-contrib/imports-loader
Imports Loader
https://github.com/webpack-contrib/imports-loader
webpack-loader
Last synced: 3 days ago
JSON representation
Imports Loader
- Host: GitHub
- URL: https://github.com/webpack-contrib/imports-loader
- Owner: webpack-contrib
- License: mit
- Created: 2012-11-06T15:03:17.000Z (over 12 years ago)
- Default Branch: master
- Last Pushed: 2024-10-29T07:46:55.000Z (4 months ago)
- Last Synced: 2024-10-30T01:01:28.582Z (4 months ago)
- Topics: webpack-loader
- Language: JavaScript
- Homepage:
- Size: 2.95 MB
- Stars: 520
- Watchers: 22
- Forks: 63
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: .github/CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE
- Codeowners: .github/CODEOWNERS
Awesome Lists containing this project
README
[![npm][npm]][npm-url]
[![node][node]][node-url]
[![tests][tests]][tests-url]
[![cover][cover]][cover-url]
[![discussion][discussion]][discussion-url]
[![size][size]][size-url]
# imports-loader
The imports loader allows you to use modules that depend on specific global variables.
This is useful for third-party modules that rely on global variables like `$` or `this` being the `window` object.
The imports loader can add the necessary `require('whatever')` calls, so those modules work with webpack.
For further hints on compatibility issues, check out [Shimming](https://webpack.js.org/guides/shimming/) of the official docs.
> [!WARNING]
>
> By default loader generate ES module named syntax.
> [!WARNING]
>
> Be careful, existing imports (`import`/`require`) in the original code and importing new values can cause failure.
## Getting Started
To begin, you'll need to install `imports-loader`:
```console
npm install imports-loader --save-dev
```
or
```console
yarn add -D imports-loader
```
or
```console
pnpm add -D imports-loader
```
Given you have this file:
**example.js**
```js
$("img").doSomeAwesomeJqueryPluginStuff();
```
Then you can inject the `jquery` value into the module by configuring the `imports-loader` using two approaches.
### Inline
The `|` or `%20` (space) allow to separate the `syntax`, `moduleName`, `name` and `alias` of import.
The documentation and syntax examples can be read [here](#syntax).
> [!WARNING]
>
> `%20` is space in a query string, because you can't use spaces in URLs
```js
// Alternative syntax:
//
// import myLib from 'imports-loader?imports=default%20jquery%20$!./example.js';
//
// `%20` is space in a query string, equivalently `default jquery $`
import myLib from "imports-loader?imports=default|jquery|$!./example.js";
// Adds the following code to the beginning of example.js:
//
// import $ from "jquery";
//
// ...
// Code
// ...
```
```js
import myLib from "imports-loader?imports=default|jquery|$,angular!./example.js";
// `|` is separator in a query string, equivalently `default|jquery|$` and `angular`
// Adds the following code to the beginning of example.js:
//
// import $ from "jquery";
// import angular from "angular";
//
// ...
// Code
// ...
```
```js
import myLib from "imports-loader?imports=named|library|myMethod,angular!./example.js";
// `|` is separator in a query string, equivalently `named|library|myMethod` and `angular`
// Adds the following code to the beginning of example.js:
//
// import { myMethod } from "library";
// import angular from "angular";
//
// ...
// Code
// ...
```
```js
const myLib = require(
`imports-loader?type=commonjs&imports=single|jquery|$,angular!./example.js`,
);
// `|` is separator in a query string, equivalently `single|jquery|$` and `angular`
// Adds the following code to the beginning of example.js:
//
// var $ = require("jquery");
// var angular = require("angular");
//
// ...
// Code
// ...
```
```js
const myLib = require(
`imports-loader?type=commonjs&imports=single|myLib|myMethod&wrapper=window&!./example.js`,
);
// `|` is separator in a query string, equivalently `single|myLib|myMethod` and `angular`
// Adds the following code to the example.js:
//
// const myMethod = require('myLib');
//
// (function () {
// ...
// Code
// ...
// }.call(window));
```
```js
import myLib from "imports-loader?additionalCode=var%20myVariable%20=%20false;!./example.js";
// Adds the following code to the beginning of example.js:
//
// var myVariable = false;
//
// ...
// Code
// ...
```
### Using Configuration
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
// You can use `regexp`
// test: /example\.js$/
test: require.resolve("example.js"),
use: [
{
loader: "imports-loader",
options: {
imports: [
"default jquery $",
"default lib_2 lib_2_default",
"named lib_3 lib2_method_1",
"named lib_3 lib2_method_2 lib_2_method_2_short",
"namespace lib_4 my_namespace",
"side-effects lib_5",
{
syntax: "default",
moduleName: "angular",
name: "angular",
},
],
},
},
],
},
],
},
};
```
Generate output:
```js
import $ from "jquery";
import lib_2_default from "lib_2";
import { lib2_method_1, lib2_method_2 as lib_2_method_2_short } from "lib_3";
import * as my_namespace from "lib_4";
import "lib_5";
import angular from "angular";
```
And run `webpack` via your preferred method.
## Options
- **[`type`](#type)**
- **[`imports`](#imports)**
- **[`wrapper`](#wrapper)**
- **[`additionalCode`](#additionalcode)**
### `type`
Type:
```ts
type type = string;
```
Default: `module`
Format of generated exports.
Possible values - `commonjs` (CommonJS module syntax) and `module` (ES module syntax).
#### `commonjs`
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
loader: "imports-loader",
options: {
syntax: "default",
type: "commonjs",
imports: "Foo",
},
},
],
},
};
```
Generate output:
```js
var Foo = require("Foo");
// ...
// Code
// ...
```
#### `module`
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
loader: "imports-loader",
options: {
type: "module",
imports: "Foo",
},
},
],
},
};
```
Generate output:
```js
import Foo from "Foo";
// ...
// Code
// ...
```
### `imports`
Type:
```ts
type imports =
| string
| {
syntax:
| "default"
| "named"
| "namespace"
| "side-effects"
| "single"
| "multiple"
| "pure";
moduleName: string;
name: string;
alias: string;
}
| Array<
| string
| {
syntax:
| "default"
| "named"
| "namespace"
| "side-effects"
| "single"
| "multiple"
| "pure";
moduleName: string;
name: string;
alias: string;
}
>;
```
Default: `undefined`
List of imports.
#### `string`
Allows to use a string to describe an export.
##### `Syntax`
The `|` or `%20` (space) allow to separate the `syntax`, `moduleName`, `name` and `alias` of import.
String syntax - `[[syntax] [moduleName] [name] [alias]]` or `[[syntax]|[moduleName]|[name]|[alias]]`, where:
- `[syntax]` (**may be omitted**):
- if `type` is `module`- can be `default`, `named`, `namespace` or `side-effects`, the default value is `default`.
- if `type` is `commonjs`- can be `single`, `multiple` or `pure`, the default value is `single`.
- `[moduleName]` - name of an imported module (**required**)
- `[name]` - name of an imported value (**required**)
- `[alias]` - alias of an imported value (**may be omitted**)
Examples:
If type `module`:
- `[Foo]` - generates `import Foo from "Foo";`.
- `[default Foo]` - generates `import Foo from "Foo";`.
- `[default ./my-lib Foo]` - generates `import Foo from "./my-lib";`.
- `[named Foo FooA]` - generates `import { FooA } from "Foo";`.
- `[named Foo FooA Bar]` - generates `import { FooA as Bar } from "Foo";`.
- `[namespace Foo FooA]` - generates `import * as FooA from "Foo";`.
- `[side-effects Foo]` - generates `import "Foo";`.
If type `commonjs`:
- `[Foo]` - generates `const Foo = require("Foo");`.
- `[single Foo]` - generates `const Foo = require("Foo");`.
- `[single ./my-lib Foo]` - generates `const Foo = require("./my-lib");`.
- `[multiple Foo FooA Bar]` - generates `const { FooA: Bar } = require("Foo");`.
- `[pure Foo]` - generates `require("Foo");`.
> [!WARNING]
>
> You need to set `type: "commonjs"` to use `single`, `multiple` and `pure` syntaxes.
> [!WARNING]
>
> Aliases can't be used together with `default`, `namespace`, `side-effects`, `single` and `pure` syntaxes.
###### Examples
###### ES Module Default Import
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("./path/to/example.js"),
loader: "imports-loader",
options: {
imports: "default lib myName",
},
},
],
},
};
```
Generate output:
```js
import myName from "lib";
// ...
// Code
// ...
```
###### CommonJS Single Import
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("./path/to/example.js"),
loader: "imports-loader",
options: {
type: "commonjs",
imports: "single lib myName",
},
},
],
},
};
```
Generate output:
```js
var myName = require("lib");
// ...
// Code
// ...
```
#### `object`
Allows to use an object to describe an import.
Properties:
- `syntax`:
- if `type` is `module`- can be `default`, `named`, `namespace` or `side-effects`
- if `type` is `commonjs`- can be `single`, `multiple` or `pure`
- `moduleName` - name of an imported module (**required**)
- `name` - name of an imported value (**required**)
- `alias` - alias of an imported value (**may be omitted**)
> [!WARNING]
>
> Alias can't be used together with `default`, `namespace`, `side-effects`, `single` and `pure` syntaxes.
##### Examples
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
use: [
{
loader: "imports-loader",
options: {
imports: {
syntax: "named",
moduleName: "lib_2",
name: "lib2_method_2",
alias: "lib_2_method_2_alias",
},
},
},
],
},
],
},
};
```
Generate output:
```js
import { lib2_method_2 as lib_2_method_2_alias } from "lib_2";
// ...
// Code
// ...
```
#### `array`
Allow to specify multiple imports.
Each item can be a [`string`](https://github.com/webpack-contrib/imports-loader#string) or an [`object`](https://github.com/webpack-contrib/imports-loader#object).
##### Examples
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
use: [
{
loader: "imports-loader",
options: {
imports: [
{
moduleName: "angular",
},
{
syntax: "default",
moduleName: "jquery",
name: "$",
},
"default lib_2 lib_2_default",
"named lib_2 lib2_method_1",
"named lib_2 lib2_method_2 lib_2_method_2_alias",
"namespace lib_3 lib_3_all",
"side-effects lib_4",
],
},
},
],
},
],
},
};
```
Generate output:
```js
import angular from "angular";
import $ from "jquery";
import lib_2_default from "lib_2";
import { lib2_method_1, lib2_method_2 as lib_2_method_2_alias } from "lib_2";
import * as lib_3_all from "lib_3";
import "lib_4";
// ...
// Code
// ...
```
### `wrapper`
Type:
```ts
type wrapper =
| boolean
| string
| {
thisArg: string;
args: Record | Array;
};
```
Default: `undefined`
Closes the module code in a function with a given `thisArg` and `args` (`(function () { ... }).call();`).
> [!WARNING]
>
> Do not use this option if source code contains ES module import(s)
#### `boolean`
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
use: [
{
loader: "imports-loader",
options: {
imports: {
moduleName: "jquery",
name: "$",
},
wrapper: true,
},
},
],
},
],
},
};
```
Generate output:
```js
import $ from "jquery";
(function () {
// ...
// Code
// ...
}).call();
```
#### `string`
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
use: [
{
loader: "imports-loader",
options: {
imports: {
moduleName: "jquery",
name: "$",
},
wrapper: "window",
},
},
],
},
],
},
};
```
Generate output:
```js
import $ from "jquery";
(function () {
// ...
// Code
// ...
}).call(window);
```
#### `object`
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
use: [
{
loader: "imports-loader",
options: {
imports: {
moduleName: "jquery",
name: "$",
},
wrapper: {
thisArg: "window",
args: ["myVariable", "myOtherVariable"],
},
},
},
],
},
],
},
};
```
Generate output:
```js
import $ from "jquery";
(function (myVariable, myOtherVariable) {
// ...
// Code
// ...
}).call(window, myVariable, myOtherVariable);
```
#### `object` with different parameter names
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
use: [
{
loader: "imports-loader",
options: {
imports: {
moduleName: "jquery",
name: "$",
},
wrapper: {
thisArg: "window",
args: {
myVariable: "var1",
myOtherVariable: "var2",
},
},
},
},
],
},
],
},
};
```
Generate output:
```js
import $ from "jquery";
(function (var1, var2) {
// ...
// Code
// ...
}).call(window, myVariable, myOtherVariable);
```
### `additionalCode`
Type:
```ts
type additionalCode = string;
```
Default: `undefined`
Adds custom code as a preamble before the module's code.
##### Examples
###### Define custom variable
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
use: [
{
loader: "imports-loader",
options: {
imports: {
moduleName: "jquery",
name: "$",
},
additionalCode: "var myVariable = false;",
},
},
],
},
],
},
};
```
Generate output:
```js
import $ from "jquery";
var myVariable = false;
// ...
// Code
// ...
```
###### Disable AMD Import Syntax
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: require.resolve("example.js"),
use: [
{
loader: "imports-loader",
options: {
imports: {
moduleName: "jquery",
name: "$",
},
additionalCode:
"var define = false; /* Disable AMD for misbehaving libraries */",
},
},
],
},
],
},
};
```
Generate output:
```js
import $ from "jquery";
var define = false; /* Disable AMD for misbehaving libraries */
// ...
// Code
// ...
```
## Contributing
Please take a moment to read our contributing guidelines if you haven't yet done so.
[CONTRIBUTING](./.github/CONTRIBUTING.md)
## License
[MIT](./LICENSE)
[npm]: https://img.shields.io/npm/v/imports-loader.svg
[npm-url]: https://www.npmjs.com/package/imports-loader
[node]: https://img.shields.io/node/v/imports-loader.svg
[node-url]: https://nodejs.org
[tests]: https://github.com/webpack-contrib/imports-loader/workflows/imports-loader/badge.svg
[tests-url]: https://github.com/webpack-contrib/imports-loader/actions
[cover]: https://codecov.io/gh/webpack-contrib/imports-loader/branch/master/graph/badge.svg
[cover-url]: https://codecov.io/gh/webpack-contrib/imports-loader
[discussion]: https://img.shields.io/github/discussions/webpack/webpack
[discussion-url]: https://github.com/webpack/webpack/discussions
[size]: https://packagephobia.now.sh/badge?p=imports-loader
[size-url]: https://packagephobia.now.sh/result?p=imports-loader