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+# loader-utils
+
+## Methods
+
+### `getLoaderConfig`
+
+Recommended way to retrieve the loader config:
+
+```javascript
+// 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...
+
+```javascript
+cheesecakeLoader: {
+ type: "delicious",
+ slices: 4
+}
+```
+
+...and your loader was called with `?slices=8`, `getLoaderConfig(this, "cheesecakeLoader")` would return
+
+```javascript
+{
+ type: "delicious",
+ slices: 8
+}
+```
+
+It is recommended that you use the camelCased loader name as your default config property name.
+
+### `parseQuery`
+
+``` javascript
+var query = loaderUtils.parseQuery(this.query);
+assert(typeof query == "object");
+if(query.flag)
+ // ...
+```
+
+``` text
+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`
+
+Turns a request into a string that can be used inside `require()` or `import` while avoiding absolute paths.
+Use it instead of `JSON.stringify(...)` if you're generating code inside a loader.
+
+**Why is this necessary?** Since webpack calculates the hash before module paths are translated into module ids, we must avoid absolute paths to ensure
+consistent hashes across different compilations.
+
+This function:
+
+- resolves absolute requests into relative requests if the request and the module are on the same hard drive
+- replaces `\` with `/` if the request and the module are on the same hard drive
+- won't change the path at all if the request and the module are on different hard drives
+- applies `JSON.stringify` to the result
+
+```javascript
+loaderUtils.stringifyRequest(this, "./test.js");
+// "\"./test.js\""
+
+loaderUtils.stringifyRequest(this, ".\\test.js");
+// "\"./test.js\""
+
+loaderUtils.stringifyRequest(this, "test");
+// "\"test\""
+
+loaderUtils.stringifyRequest(this, "test/lib/index.js");
+// "\"test/lib/index.js\""
+
+loaderUtils.stringifyRequest(this, "otherLoader?andConfig!test?someConfig");
+// "\"otherLoader?andConfig!test?someConfig\""
+
+loaderUtils.stringifyRequest(this, require.resolve("test"));
+// "\"../node_modules/some-loader/lib/test.js\""
+
+loaderUtils.stringifyRequest(this, "C:\\module\\test.js");
+// "\"../../test.js\"" (on Windows, in case the module and the request are on the same drive)
+
+loaderUtils.stringifyRequest(this, "C:\\module\\test.js");
+// "\"C:\\module\\test.js\"" (on Windows, in case the module and the request are on different drives)
+
+loaderUtils.stringifyRequest(this, "\\\\network-drive\\test.js");
+// "\"\\\\network-drive\\\\test.js\"" (on Windows, in case the module and the request are on different drives)
+```
+
+### `urlToRequest`
+
+Converts some resource URL to a webpack module request.
+
+```javascript
+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.
+
+```javascript
+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:
+
+```javascript
+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 `~`:
+
+```javascript
+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.
+
+```javascript
+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 `hashType`s, i. e. `sha1`, `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`
+
+Examples
+
+``` javascript
+// 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`
+
+``` javascript
+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)