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Allows you to set up exports using module.exports or export for source files.

Useful when a source file does not contain exports or when something is not exported.

For more information on compatibility issues, refer to the Shimming guide in the official documentation.

Warning

By default, the loader generates exports using ES module syntax.

Warning

Be careful: modifying existing exports (export, module.exports, or exports) or adding new exports can lead to errors.

To begin, you'll need to install exports-loader:

npm install exports-loader --save-dev

or

yarn add -D exports-loader

or

pnpm add -D exports-loader

The | or %20 (space) allow to separate the syntax, name and alias of export.

The documentation and syntax examples can be read here.

Warning

%20 represents a space in a query string because spaces are not allowed in URLs.

Then add the loader to the desired import statement or require calls. For example:

import { myFunction } from "exports-loader?exports=myFunction!./file.js";
// Adds the following code to the file's source:
//
// ...
// Code
// ...
//
// export { myFunction }

myFunction("Hello world");
JavaScript

Descriptions of string values can be found in the documentation below.

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        // You can use `regexp`
        // test: /vendor\.js/$
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          exports: "myFunction",
        },
      },
    ],
  },
};
JavaScript

Finally, run webpack using the method you normally use (e.g., via CLI or an npm script).

NameTypeDefaultDescription
type{String}moduleFormat of generated exports
exports{String|Object|Array<String|Object>}undefinedList of exports

Type: String Default: module

Format of generated exports.

Possible values - commonjs (CommonJS module syntax) and module (ES module syntax).

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          type: "commonjs",
          exports: "Foo",
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

module.exports = { Foo };
JavaScript

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          type: "module",
          exports: "Foo",
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

export { Foo };
JavaScript

Type: String|Array Default: undefined

List of exports.

Allows to use a string to describe an export.

The | or %20 (space) allow to separate the syntax, name and alias of export.

String syntax - [[syntax] [name] [alias]] or [[syntax]|[name]|[alias]], where:

  • [syntax] (may be omitted) -

    • if type is module- can be default and named,
    • if type is commonjs- can be single and multiple

  • [name] - name of an exported value (required)

  • [alias] - alias of an exported value (may be omitted)

Examples:

  • [Foo] - generates export { Foo };.
  • [default Foo] - generates export default Foo;.
  • [named Foo] - generates export { Foo };.
  • [named Foo FooA] - generates export { Foo as FooA };.
  • [single Foo] - generates module.exports = Foo;.
  • [multiple Foo] - generates module.exports = { Foo };.
  • [multiple Foo FooA] - generates module.exports = { 'FooA': Foo };.
  • [named [name] [name]Alias] - generates ES module named exports and exports a value equal to the filename under other name., for single.js it will be single and singleAlias, generates export { single as singleAlias };.
Warning

You need to set type: "commonjs" to use single or multiple syntaxes.

Warning

Aliases can't be used together with default or single syntaxes.

ES Module Default Export

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          exports: "default Foo",
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

export default Foo;
JavaScript
ES Module Named Exports

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          exports: "named Foo FooA",
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

export { Foo as FooA };
JavaScript
CommonJS Single Export

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          type: "commonjs",
          exports: "single Foo",
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

module.exports = Foo;
JavaScript
CommonJS Multiple Exports

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          type: "commonjs",
          exports: "multiple Foo FooA",
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

module.exports = { FooA: Foo };
JavaScript

Allows to use an object to describe an export.

Properties:

  • syntax - can be default or named for the module type (ES modules module format), and single or multiple for the commonjs type (CommonJS module format) (may be omitted)
  • name - name of an exported value (required)
  • alias - alias of an exported value (may be omitted)
ES Module Default Export

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          exports: {
            syntax: "default",
            name: "Foo",
          },
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

export default Foo;
JavaScript
ES Module Named Exports

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          exports: {
            syntax: "named",
            name: "Foo",
            alias: "FooA",
          },
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

export { Foo as FooA };
JavaScript
CommonJS Single Export

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          type: "commonjs",
          exports: {
            syntax: "single",
            name: "Foo",
          },
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

module.exports = Foo;
JavaScript
CommonJS Multiple Exports

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          type: "commonjs",
          exports: {
            syntax: "multiple",
            name: "Foo",
            alias: "FooA",
          },
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

module.exports = { FooA: Foo };
JavaScript

Allow to specify multiple exports. Each item can be a string or an object.

Warning

Not possible to use both single and multiple syntaxes together due to CommonJS format limitations.

Warning

Not possible to use multiple default values due to ES module format limitations.

Warning

Not possible to use multiple single values due to CommonJS format limitations.

CommonJS Multiple Exports

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          type: "commonjs",
          exports: ["Foo", "multiple Bar", "multiple Baz BazA"],
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

module.exports = { Bar, BazA: Bar, Foo };
JavaScript
ES Module Default Export And Named Exports Together

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          exports: ["default Foo", "named Bar BarA"],
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

export default Foo;
export { Bar as BarA };
JavaScript
Named Exports

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: require.resolve("./path/to/vendor.js"),
        loader: "exports-loader",
        options: {
          exports: [
            { syntax: "named", name: "Foo", alias: "FooA" },
            { syntax: "named", name: "Bar" },
            "Baz",
          ],
        },
      },
    ],
  },
};
JavaScript

Generate output:

// ...
// Code
// ...

export { Foo as FooA, Bar, Baz };
JavaScript