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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
```javascript
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:
```javascript
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.
```javascript
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:
```javascript
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 `~`:
```javascript
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.
```javascript
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 `hashType`s, i. e. `xxhash64`, `sha1`, `md4` (wasm version), `native-md4` (`crypto` module version), `md5`, `sha256`, `sha512`
- other `digestType`s, 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 `hashType`s, i. e. `xxhash64`, `sha1`, `md4` (wasm version), `native-md4` (`crypto` module version), `md5`, `sha256`, `sha512`
- other `digestType`s, 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
```javascript
// 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`
```javascript
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)
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