export type Options = {
	/**
	@default 'http'
	*/
	readonly defaultProtocol?: 'https' | 'http';

	/**
	Protocols to normalize in addition to the built-in ones (`https`, `http`, `file`, `data`).

	Useful for HTTP-like custom protocols such as Electron schemes or app-specific protocols.

	The protocols should be specified without `:`.

	@default undefined

	@example
	```
	normalizeUrl('sindre://www.sorhus.com', {customProtocols: ['sindre']});
	//=> 'sindre://sorhus.com'

	normalizeUrl('sindre://www.sorhus.com/foo/', {customProtocols: ['sindre']});
	//=> 'sindre://sorhus.com/foo'
	```
	*/
	readonly customProtocols?: readonly string[];

	/**
	Prepends `defaultProtocol` to the URL if it's protocol-relative.

	@default true

	@example
	```
	normalizeUrl('//sindresorhus.com');
	//=> 'http://sindresorhus.com'

	normalizeUrl('//sindresorhus.com', {normalizeProtocol: false});
	//=> '//sindresorhus.com'
	```
	*/
	readonly normalizeProtocol?: boolean;

	/**
	Normalizes HTTPS URLs to HTTP.

	@default false

	@example
	```
	normalizeUrl('https://sindresorhus.com');
	//=> 'https://sindresorhus.com'

	normalizeUrl('https://sindresorhus.com', {forceHttp: true});
	//=> 'http://sindresorhus.com'
	```
	*/
	readonly forceHttp?: boolean;

	/**
	Normalizes HTTP URLs to HTTPS.

	This option cannot be used with the `forceHttp` option at the same time.

	@default false

	@example
	```
	normalizeUrl('http://sindresorhus.com');
	//=> 'http://sindresorhus.com'

	normalizeUrl('http://sindresorhus.com', {forceHttps: true});
	//=> 'https://sindresorhus.com'
	```
	*/
	readonly forceHttps?: boolean;

	/**
	Strip the [authentication](https://en.wikipedia.org/wiki/Basic_access_authentication) part of a URL.

	@default true

	@example
	```
	normalizeUrl('https://user:password@sindresorhus.com');
	//=> 'https://sindresorhus.com'

	normalizeUrl('https://user:password@sindresorhus.com', {stripAuthentication: false});
	//=> 'https://user:password@sindresorhus.com'
	```
	*/
	readonly stripAuthentication?: boolean;

	/**
	Removes hash from the URL.

	@default false

	@example
	```
	normalizeUrl('sindresorhus.com/about.html#contact');
	//=> 'http://sindresorhus.com/about.html#contact'

	normalizeUrl('sindresorhus.com/about.html#contact', {stripHash: true});
	//=> 'http://sindresorhus.com/about.html'
	```
	*/
	readonly stripHash?: boolean;

	/**
	Remove the protocol from the URL: `http://sindresorhus.com` → `sindresorhus.com`.

	It will only remove `https://` and `http://` protocols.

	@default false

	@example
	```
	normalizeUrl('https://sindresorhus.com');
	//=> 'https://sindresorhus.com'

	normalizeUrl('sindresorhus.com', {stripProtocol: true});
	//=> 'sindresorhus.com'
	```
	*/
	readonly stripProtocol?: boolean;

	/**
	Strip the [text fragment](https://web.dev/text-fragments/) part of the URL

	__Note:__ The text fragment will always be removed if the `stripHash` option is set to `true`, as the hash contains the text fragment.

	@default true

	@example
	```
	normalizeUrl('http://sindresorhus.com/about.html#:~:text=hello');
	//=> 'http://sindresorhus.com/about.html#'

	normalizeUrl('http://sindresorhus.com/about.html#section:~:text=hello');
	//=> 'http://sindresorhus.com/about.html#section'

	normalizeUrl('http://sindresorhus.com/about.html#:~:text=hello', {stripTextFragment: false});
	//=> 'http://sindresorhus.com/about.html#:~:text=hello'

	normalizeUrl('http://sindresorhus.com/about.html#section:~:text=hello', {stripTextFragment: false});
	//=> 'http://sindresorhus.com/about.html#section:~:text=hello'
	```
	*/
	readonly stripTextFragment?: boolean;

	/**
	Removes `www.` from the URL.

	@default true

	@example
	```
	normalizeUrl('http://www.sindresorhus.com');
	//=> 'http://sindresorhus.com'

	normalizeUrl('http://www.sindresorhus.com', {stripWWW: false});
	//=> 'http://www.sindresorhus.com'
	```
	*/
	readonly stripWWW?: boolean;

	/**
	Removes query parameters that matches any of the provided strings or regexes.

	Global and sticky regex flags are stripped.

	@default [/^utm_\w+/i]

	@example
	```
	normalizeUrl('www.sindresorhus.com?foo=bar&ref=test_ref', {
		removeQueryParameters: ['ref']
	});
	//=> 'http://sindresorhus.com/?foo=bar'
	```

	If a boolean is provided, `true` will remove all the query parameters.

	```
	normalizeUrl('www.sindresorhus.com?foo=bar', {
		removeQueryParameters: true
	});
	//=> 'http://sindresorhus.com'
	```

	`false` will not remove any query parameter.

	```
	normalizeUrl('www.sindresorhus.com?foo=bar&utm_medium=test&ref=test_ref', {
		removeQueryParameters: false
	});
	//=> 'http://www.sindresorhus.com/?foo=bar&ref=test_ref&utm_medium=test'
	```
	*/
	readonly removeQueryParameters?: ReadonlyArray<RegExp | string> | boolean;

	/**
	Keeps only query parameters that matches any of the provided strings or regexes.

	__Note__: It overrides the `removeQueryParameters` option.

	Global and sticky regex flags are stripped.

	@default undefined

	@example
	```
	normalizeUrl('https://sindresorhus.com?foo=bar&ref=unicorn', {
		keepQueryParameters: ['ref']
	});
	//=> 'https://sindresorhus.com/?ref=unicorn'
	```
	*/
	readonly keepQueryParameters?: ReadonlyArray<RegExp | string>;

	/**
	Removes trailing slash.

	__Note__: Trailing slash is always removed if the URL doesn't have a pathname unless the `removeSingleSlash` option is set to `false`.

	@default true

	@example
	```
	normalizeUrl('http://sindresorhus.com/redirect/');
	//=> 'http://sindresorhus.com/redirect'

	normalizeUrl('http://sindresorhus.com/redirect/', {removeTrailingSlash: false});
	//=> 'http://sindresorhus.com/redirect/'

	normalizeUrl('http://sindresorhus.com/', {removeTrailingSlash: false});
	//=> 'http://sindresorhus.com'
	```
	*/
	readonly removeTrailingSlash?: boolean;

	/**
	Remove a sole `/` pathname in the output. This option is independent of `removeTrailingSlash`.

	@default true

	@example
	```
	normalizeUrl('https://sindresorhus.com/');
	//=> 'https://sindresorhus.com'

	normalizeUrl('https://sindresorhus.com/', {removeSingleSlash: false});
	//=> 'https://sindresorhus.com/'
	```
	*/
	readonly removeSingleSlash?: boolean;

	/**
	Removes the default directory index file from path that matches any of the provided strings or regexes.

	When `true`, the regex `/^index\.[a-z]+$/` is used.

	Global and sticky regex flags are stripped.

	@default false

	@example
	```
	normalizeUrl('www.sindresorhus.com/foo/default.php', {
		removeDirectoryIndex: [/^default\.[a-z]+$/]
	});
	//=> 'http://sindresorhus.com/foo'
	```
	*/
	readonly removeDirectoryIndex?: boolean | ReadonlyArray<RegExp | string>;

	/**
	Removes an explicit port number from the URL.

	Port 443 is always removed from HTTPS URLs and 80 is always removed from HTTP URLs regardless of this option.

	@default false

	@example
	```
	normalizeUrl('sindresorhus.com:123', {
		removeExplicitPort: true
	});
	//=> 'http://sindresorhus.com'
	```
	*/
	readonly removeExplicitPort?: boolean;

	/**
	Sorts the query parameters alphabetically by key.

	@default true

	@example
	```
	normalizeUrl('www.sindresorhus.com?b=two&a=one&c=three', {
		sortQueryParameters: false
	});
	//=> 'http://sindresorhus.com/?b=two&a=one&c=three'
	```
	*/
	readonly sortQueryParameters?: boolean;

	/**
	Controls how query parameters with empty values are formatted.

	- `'preserve'` - Keep the original format (`?key` stays `?key`, `?key=` stays `?key=`). If the same key appears with both formats (`?a&a=`), all instances will use the format without `=`.
	- `'always'` - Always include `=` for empty values (`?key` becomes `?key=`)
	- `'never'` - Never include `=` for empty values (`?key=` becomes `?key`)

	@default 'preserve'

	@example
	```
	normalizeUrl('www.sindresorhus.com?a&b=', {emptyQueryValue: 'always'});
	//=> 'http://sindresorhus.com/?a=&b='

	normalizeUrl('www.sindresorhus.com?a&b=', {emptyQueryValue: 'never'});
	//=> 'http://sindresorhus.com/?a&b'
	```
	*/
	readonly emptyQueryValue?: 'preserve' | 'always' | 'never';

	/**
	Removes the entire URL path, leaving only the domain.

	@default false

	@example
	```
	normalizeUrl('https://example.com/path/to/page', {
		removePath: true
	});
	//=> 'https://example.com'
	```
	*/
	readonly removePath?: boolean;

	/**
	Custom function to transform the URL path components.

	The function receives an array of non-empty path components and should return a modified array.

	@default false

	@example
	```
	// Keep only the first path component
	normalizeUrl('https://example.com/api/v1/users', {
		transformPath: (pathComponents) => pathComponents.slice(0, 1)
	});
	//=> 'https://example.com/api'

	// Remove specific components
	normalizeUrl('https://example.com/admin/users', {
		transformPath: (pathComponents) => pathComponents.filter(c => c !== 'admin')
	});
	//=> 'https://example.com/users'
	```
	*/
	readonly transformPath?: (pathComponents: string[]) => string[];
};

/**
[Normalize](https://en.wikipedia.org/wiki/URL_normalization) a URL.

URLs with custom protocols are not normalized and just passed through by default. Supported protocols are: `https`, `http`, `file`, and `data`. Use the `customProtocols` option to add support for additional protocols.

Human-friendly URLs with basic auth (for example, `user:password@sindresorhus.com`) are not handled because basic auth conflicts with custom protocols. [Basic auth URLs are also deprecated.](https://developer.mozilla.org/en-US/docs/Web/HTTP/Authentication#access_using_credentials_in_the_url)

@param url - URL to normalize, including [data URL](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs).

@example
```
import normalizeUrl from 'normalize-url';

normalizeUrl('sindresorhus.com');
//=> 'http://sindresorhus.com'

normalizeUrl('//www.sindresorhus.com:80/../baz?b=bar&a=foo');
//=> 'http://sindresorhus.com/baz?a=foo&b=bar'
```
*/
export default function normalizeUrl(url: string, options?: Options): string;
