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loader-utils

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loader-utils

utils for webpack loaders

    3.2.0latest

Version published
Maintainers
3
Weekly downloads
53,148,631
increased by1.22%

Weekly downloads

Changelog

Source

3.2.0 (2021-11-11)

Features

  • hash uniformity for base digests (451858b)

Readme

Source

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
    • 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
    • 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.

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
  • maxLength the maximum length in chars

License

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

FAQs

What is loader-utils?

utils for webpack loaders

Is loader-utils popular?

The npm package loader-utils receives a total of 43,122,097 weekly downloads. As such, loader-utils popularity was classified as popular.

Is loader-utils well maintained?

We found that loader-utils demonstrated a healthy version release cadence and project activity. It has 3 open source maintainers collaborating on the project.

Last updated on 11 Nov 2021
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