loader-utils

Methods

getLoaderConfig

Recommended way to retrieve the loader config:

// inside your loader
config = loaderUtils.getLoaderConfig(this, "myLoader");

Tries to read the loader config from the webpack.config.js under the given property name ("myLoader" in this case) and merges the result with the loader query. For example, if your webpack.config.js had this property...

cheesecakeLoader: {
	type: "delicious",
	slices: 4
}

...and your loader was called with ?slices=8, getLoaderConfig(this, "cheesecakeLoader") would return

{
	type: "delicious",
	slices: 8
}

It is recommended that you use the camelCased loader name as your default config property name.

parseQuery

var query = loaderUtils.parseQuery(this.query);
assert(typeof query == "object");
if(query.flag)
	// ...

null                   -> {}
?                      -> {}
?flag                  -> { flag: true }
?+flag                 -> { flag: true }
?-flag                 -> { flag: false }
?xyz=test              -> { xyz: "test" }
?xyz[]=a               -> { xyz: ["a"] }
?flag1&flag2           -> { flag1: true, flag2: true }
?+flag1,-flag2         -> { flag1: true, flag2: false }
?xyz[]=a,xyz[]=b       -> { xyz: ["a", "b"] }
?a%2C%26b=c%2C%26d     -> { "a,&b": "c,&d" }
?{json:5,data:{a:1}}   -> { json: 5, data: { a: 1 } }

stringifyRequest

Makes a request pretty and stringifies it. Absolute paths are replaced with relative ones.

Use it instead of JSON.stringify(...) to build code of a require(...) call in a loader.

loaderUtils.stringifyRequest(this, require.resolve("./test"));
// = "../node_modules/some-loader/lib/test.js"

urlToRequest

Converts some resource URL to a webpack module request.

var url = "path/to/module.js";
var request = loaderUtils.urlToRequest(url); // "./path/to/module.js"

Module URLs

Any URL containing a ~ will be interpreted as a module request. Anything after the ~ will be considered the request path.

var url = "~path/to/module.js";
var request = loaderUtils.urlToRequest(url); // "path/to/module.js"

Root-relative URLs

URLs that are root-relative (start with /) can be resolved relative to some arbitrary path by using the root parameter:

var url = "/path/to/module.js";
var root = "./root";
var request = loaderUtils.urlToRequest(url, root); // "./root/path/to/module.js"

To convert a root-relative URL into a module URL, specify a root value that starts with ~:

var url = "/path/to/module.js";
var root = "~";
var request = loaderUtils.urlToRequest(url, root); // "path/to/module.js"

interpolateName

Interpolates a filename template using multiple placeholders and/or a regular expression. The template and regular expression are set as query params called name and regExp on the current loader's context.

var interpolatedName = loaderUtils.interpolateName(loaderContext, name, options);

The following tokens are replaced in the name parameter:

• [ext] the extension of the resource
• [name] the basename of the resource
• [path] the path of the resource relative to the context query parameter or option.
• [folder] the folder of the resource is in.
• [emoji] a random emoji representation of options.content
• [emoji:<length>] same as above, but with a customizable number of emojis
• [hash] the hash of options.content (Buffer) (by default it's the hex digest of the md5 hash)
• [<hashType>:hash:<digestType>:<length>] optionally one can configure
  • other hashTypes, i. e. sha1, md5, sha256, sha512
  • other digestTypes, i. e. hex, base26, base32, base36, base49, base52, base58, base62, base64
  • and length the length in chars
• [N] the N-th match obtained from matching the current file name against options.regExp

Examples

// loaderContext.resourcePath = "/app/js/javascript.js"
loaderUtils.interpolateName(loaderContext, "js/[hash].script.[ext]", { content: ... });
// => js/9473fdd0d880a43c21b7778d34872157.script.js

// loaderContext.resourcePath = "/app/page.html"
loaderUtils.interpolateName(loaderContext, "html-[hash:6].html", { content: ... });
// => html-9473fd.html

// loaderContext.resourcePath = "/app/flash.txt"
loaderUtils.interpolateName(loaderContext, "[hash]", { content: ... });
// => c31e9820c001c9c4a86bce33ce43b679

// loaderContext.resourcePath = "/app/img/image.gif"
loaderUtils.interpolateName(loaderContext, "[emoji]", { content: ... });
// => 👍

// loaderContext.resourcePath = "/app/img/image.gif"
loaderUtils.interpolateName(loaderContext, "[emoji:4]", { content: ... });
// => 🙍🏢📤🐝

// loaderContext.resourcePath = "/app/img/image.png"
loaderUtils.interpolateName(loaderContext, "[sha512:hash:base64:7].[ext]", { content: ... });
// => 2BKDTjl.png
// use sha512 hash instead of md5 and with only 7 chars of base64

// loaderContext.resourcePath = "/app/img/myself.png"
// loaderContext.query.name =
loaderUtils.interpolateName(loaderContext, "picture.png");
// => picture.png

// loaderContext.resourcePath = "/app/dir/file.png"
loaderUtils.interpolateName(loaderContext, "[path][name].[ext]?[hash]", { content: ... });
// => /app/dir/file.png?9473fdd0d880a43c21b7778d34872157

// loaderContext.resourcePath = "/app/js/page-home.js"
loaderUtils.interpolateName(loaderContext, "script-[1].[ext]", { regExp: "page-(.*)\\.js", content: ... });
// => script-home.js

getHashDigest

var digestString = loaderUtils.getHashDigest(buffer, hashType, digestType, maxLength);

• buffer the content that should be hashed
• hashType one of sha1, md5, sha256, sha512 or any other node.js supported hash type
• digestType one of hex, base26, base32, base36, base49, base52, base58, base62, base64
• maxLength the maximum length in chars

License

MIT (http://www.opensource.org/licenses/mit-license.php)