browser-runtime-geturl-loader

This is a fork of file-loader which was optimized for use in browser extensions.

The browser-runtime-geturl-loader resolves import/require() on a file into an absolute url (using browser.runtime.getURL) and emits the file into the output directory.

All options are same as in file-loader.

Getting Started

To begin, you'll need to install browser-runtime-geturl-loader:

$ npm install browser-runtime-geturl-loader --save-dev

Import (or require) the target file(s) in one of the bundle's files:

file.js

import img from './file.png';

Then add the loader to your webpack config. For example:

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                use: [
                    {
                        loader: 'browser-runtime-geturl-loader',
                    },
                ],
            },
        ],
    },
};

And run webpack via your preferred method. This will emit file.png as a file in the output directory (with the specified naming convention, if options are specified to do so) and returns the public URI of the file.

ℹ️ By default the filename of the resulting file is the hash of the file's contents with the original extension of the required resource.

Options

name

Type: String|Function Default: '[contenthash].[ext]'

Specifies a custom filename template for the target file(s) using the query parameter name. For example, to emit a file from your context directory into the output directory retaining the full directory structure, you might use:

String

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                loader: 'browser-runtime-geturl-loader',
                options: {
                    name: '[path][name].[ext]',
                },
            },
        ],
    },
};

Function

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                loader: 'browser-runtime-geturl-loader',
                options: {
                    name(resourcePath, resourceQuery) {
                        // `resourcePath` - `/absolute/path/to/file.js`
                        // `resourceQuery` - `?foo=bar`

                        if (process.env.NODE_ENV === 'development') {
                            return '[path][name].[ext]';
                        }

                        return '[contenthash].[ext]';
                    },
                },
            },
        ],
    },
};

ℹ️ By default the path and name you specify will output the file in that same directory, and will also use the same URI path to access the file.

outputPath

Type: String|Function Default: undefined

Specify a filesystem path where the target file(s) will be placed.

String

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                loader: 'browser-runtime-geturl-loader',
                options: {
                    outputPath: 'images',
                },
            },
        ],
    },
};

Function

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                loader: 'browser-runtime-geturl-loader',
                options: {
                    outputPath: (url, resourcePath, context) => {
                        // `resourcePath` is original absolute path to asset
                        // `context` is directory where stored asset (`rootContext`) or `context` option

                        // To get relative path you can use
                        // const relativePath = path.relative(context, resourcePath);

                        if (/my-custom-image\.png/.test(resourcePath)) {
                            return `other_output_path/${url}`;
                        }

                        if (/images/.test(context)) {
                            return `image_output_path/${url}`;
                        }

                        return `output_path/${url}`;
                    },
                },
            },
        ],
    },
};

publicPath

Type: String|Function Default: __webpack_public_path__+outputPath

Specifies a custom public path for the target file(s).

String

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                loader: 'browser-runtime-geturl-loader',
                options: {
                    publicPath: 'assets',
                },
            },
        ],
    },
};

Function

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                loader: 'browser-runtime-geturl-loader',
                options: {
                    publicPath: (url, resourcePath, context) => {
                        // `resourcePath` is original absolute path to asset
                        // `context` is directory where stored asset (`rootContext`) or `context` option

                        // To get relative path you can use
                        // const relativePath = path.relative(context, resourcePath);

                        if (/my-custom-image\.png/.test(resourcePath)) {
                            return `other_public_path/${url}`;
                        }

                        if (/images/.test(context)) {
                            return `image_output_path/${url}`;
                        }

                        return `public_path/${url}`;
                    },
                },
            },
        ],
    },
};

postTransformPublicPath

Type: Function Default: undefined

Specifies a custom function to post-process the generated public path. This can be used to prepend or append dynamic global variables that are only available at runtime, like __webpack_public_path__. This would not be possible with just publicPath, since it stringifies the values.

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpg|gif)$/i,
                loader: 'browser-runtime-geturl-loader',
                options: {
                    publicPath: '/some/path/',
                    postTransformPublicPath: (p) =>
                        `__webpack_public_path__ + ${p}`,
                },
            },
        ],
    },
};

context

Type: String Default: context

Specifies a custom file context.

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                use: [
                    {
                        loader: 'browser-runtime-geturl-loader',
                        options: {
                            context: 'project',
                        },
                    },
                ],
            },
        ],
    },
};

emitFile

Type: Boolean Default: true

If true, emits a file (writes a file to the filesystem). If false, the loader will return a public URI but will not emit the file. It is often useful to disable this option for server-side packages.

file.js

// bundle file
import img from './file.png';

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.css$/i,
                use: [
                    {
                        loader: 'browser-runtime-geturl-loader',
                        options: {
                            emitFile: false,
                        },
                    },
                ],
            },
        ],
    },
};

regExp

Type: RegExp Default: undefined

Specifies a Regular Expression to one or many parts of the target file path. The capture groups can be reused in the name property using [N] placeholder.

file.js

import img from './customer01/file.png';

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                use: [
                    {
                        loader: 'browser-runtime-geturl-loader',
                        options: {
                            regExp: /\/([a-z0-9]+)\/[a-z0-9]+\.png$/i,
                            name: '[1]-[name].[ext]',
                        },
                    },
                ],
            },
        ],
    },
};

ℹ️ If [0] is used, it will be replaced by the entire tested string, whereas [1] will contain the first capturing parenthesis of your regex and so on...

esModule

Type: Boolean Default: true

By default, browser-runtime-geturl-loader generates JS modules that use the ES modules syntax. There are some cases in which using ES modules is beneficial, like in the case of module concatenation and tree shaking.

You can enable a CommonJS module syntax using:

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                    {
                        loader: 'browser-runtime-geturl-loader',
                        options: {
                            esModule: false,
                        },
                    },
                ],
            },
        ],
    },
};

Placeholders

Full information about placeholders you can find here.

[ext]

Type: String Default: file.extname

The file extension of the target file/resource.

[name]

Type: String Default: file.basename

The basename of the file/resource.

[path]

Type: String Default: file.directory

The path of the resource relative to the webpack/config context.

[folder]

Type: String Default: file.folder

The folder of the resource is in.

[query]

Type: String Default: file.query

The query of the resource, i.e. ?foo=bar.

[emoji]

Type: String Default: undefined

A random emoji representation of content.

[emoji:<length>]

Type: String Default: undefined

Same as above, but with a customizable number of emojis

[hash]

Type: String Default: md4

Specifies the hash method to use for hashing the file content.

[contenthash]

Type: String Default: md4

Specifies the hash method to use for hashing the file content.

[<hashType>:hash:<digestType>:<length>]

Type: String

The hash of options.content (Buffer) (by default it's the hex digest of the hash).

digestType

Type: String Default: 'hex'

The digest that the hash function should use. Valid values include: base26, base32, base36, base49, base52, base58, base62, base64, and hex.

hashType

Type: String Default: 'md4'

The type of hash that the hash function should use. Valid values include: md4, md5, sha1, sha256, and sha512.

length

Type: Number Default: undefined

Users may also specify a length for the computed hash.

[N]

Type: String Default: undefined

The n-th match obtained from matching the current file name against the regExp.

Examples

Names

The following examples show how one might use browser-runtime-geturl-loader and what the result would be.

file.js

import png from './image.png';

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                use: [
                    {
                        loader: 'browser-runtime-geturl-loader',
                        options: {
                            name: 'dirname/[contenthash].[ext]',
                        },
                    },
                ],
            },
        ],
    },
};

Result:

# result
dirname/0dcbbaa701328ae351f.png

file.js

import png from './image.png';

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                use: [
                    {
                        loader: 'browser-runtime-geturl-loader',
                        options: {
                            name: '[sha512:hash:base64:7].[ext]',
                        },
                    },
                ],
            },
        ],
    },
};

Result:

# result
gdyb21L.png

file.js

import png from './path/to/file.png';

webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.(png|jpe?g|gif)$/i,
                use: [
                    {
                        loader: 'browser-runtime-geturl-loader',
                        options: {
                            name: '[path][name].[ext]?[contenthash]',
                        },
                    },
                ],
            },
        ],
    },
};

Result:

# result
path/to/file.png?e43b20c069c4a01867c31e98cbce33c9

License

MIT