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loader-utils
Advanced tools
The loader-utils package provides utility functions for use with webpack loaders. It offers a variety of helper methods to make writing loaders easier and more standardized. These utilities include parsing query strings, hashing, getting options from loaders, and more.
getOptions
This function is used to parse the options passed to a loader. It simplifies the process of handling loader options within a webpack configuration.
const loaderUtils = require('loader-utils');
const options = loaderUtils.getOptions(this);
stringifyRequest
This method helps to convert a module request into a string that can be used inside of a loader. It's useful for ensuring that the request is correctly formatted and can be resolved by webpack.
const loaderUtils = require('loader-utils');
const stringifiedRequest = loaderUtils.stringifyRequest(this, require.resolve('./file.js'));
getHashDigest
This utility generates a hash digest of the given content. It's commonly used for cache busting or to generate unique identifiers for file contents.
const loaderUtils = require('loader-utils');
const hashDigest = loaderUtils.getHashDigest(Buffer.from('some content'), 'sha512', 'hex', 7);
interpolateName
This function allows for the creation of a custom filename based on placeholders and content. It's often used in file-loader and url-loader to generate names based on the file content.
const loaderUtils = require('loader-utils');
const interpolatedName = loaderUtils.interpolateName(this, '[name]_[hash].[ext]', { content: source });
Schema-utils validates options for webpack loaders and plugins against a JSON Schema. It is similar to loader-utils in that it helps with managing loader options, but it focuses on validation rather than utility functions.
File-loader resolves import/require() on a file into a url and emits the file into the output directory. It's similar to loader-utils' interpolateName feature but is a standalone loader that focuses on file handling.
Url-loader works like file-loader but can return a Data URL if the file is smaller than a byte limit. It shares some functionality with loader-utils, particularly in generating filenames and paths.
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 } }
FAQs
utils for webpack loaders
The npm package loader-utils receives a total of 37,067,069 weekly downloads. As such, loader-utils popularity was classified as popular.
We found that loader-utils demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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