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loader-utils

Methods

urlToRequest

Converts some resource URL to a webpack module request.

i Before call urlToRequest you need call isUrlRequest to ensure it is requestable url

const url = "path/to/module.js";

if (loaderUtils.isUrlRequest(url)) {
  // Logic for requestable url
  const request = loaderUtils.urlToRequest(url);
} else {
  // Logic for not requestable url
}

Simple example:

const url = "path/to/module.js";
const 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.

const url = "~path/to/module.js";
const 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:

const url = "/path/to/module.js";
const root = "./root";
const 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 ~:

const url = "/path/to/module.js";
const root = "~";
const 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.

const 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 the resource is in
[query] the queryof the resource, i.e. ?foo=bar
[contenthash] the hash of options.content (Buffer) (by default it's the hex digest of the xxhash64 hash)
[<hashType>:contenthash:<digestType>:<length>] optionally one can configure
- other hashTypes, i. e. xxhash64, sha1, md4 (wasm version), native-md4 (crypto module version), md5, sha256, sha512
- other digestTypes, i. e. hex, base26, base32, base36, base49, base52, base58, base62, base64, base64safe
- and length the length in chars
[hash] the hash of options.content (Buffer) (by default it's the hex digest of the xxhash64 hash)
[<hashType>:hash:<digestType>:<length>] optionally one can configure
- other hashTypes, i. e. xxhash64, sha1, md4 (wasm version), native-md4 (crypto module version), md5, sha256, sha512
- other digestTypes, i. e. hex, base26, base32, base36, base49, base52, base58, base62, base64, base64safe
- and length the length in chars
[N] the N-th match obtained from matching the current file name against options.regExp

In loader context [hash] and [contenthash] are the same, but we recommend using [contenthash] for avoid misleading.

digestType with base64safe don't contain /, + and = symbols.

Examples

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

// loaderContext.resourcePath = "/absolute/path/to/app/js/javascript.js"
// loaderContext.resourceQuery = "?foo=bar"
loaderUtils.interpolateName(loaderContext, "js/[hash].script.[ext][query]", { content: ... });
// => js/9473fdd0d880a43c21b7778d34872157.script.js?foo=bar

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

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

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

// loaderContext.resourcePath = "/absolute/path/to/app/img/image.png"
loaderUtils.interpolateName(loaderContext, "[sha512:hash:base64:7].[ext]", { content: ... });
// => 2BKDTjl.png
// use sha512 hash instead of xxhash64 and with only 7 chars of base64

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

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

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

// loaderContext.resourcePath = "/absolute/path/to/app/js/javascript.js"
// loaderContext.resourceQuery = "?foo=bar"
loaderUtils.interpolateName(
  loaderContext,
  (resourcePath, resourceQuery) => {
    // resourcePath - `/app/js/javascript.js`
    // resourceQuery - `?foo=bar`

    return "js/[hash].script.[ext]";
  },
  { content: ... }
);
// => js/9473fdd0d880a43c21b7778d34872157.script.js

getHashDigest

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

buffer the content that should be hashed
hashType one of xxhash64, sha1, md4, md5, sha256, sha512 or any other node.js supported hash type
digestType one of hex, base26, base32, base36, base49, base52, base58, base62, base64, base64safe
maxLength the maximum length in chars