Make defaultProtocol option accept protocol without colon

Author: sindresorhus

index.d.ts

@@ -1,10 +1,8 @@
 export type Options = {
 	/**
-	@default 'http:'
-
-	Values: `'https:' | 'http:'`
+	@default 'http'
 	*/
-	readonly defaultProtocol?: string; // TODO: Make this `'https:' | 'http:'` in the next major version.
+	readonly defaultProtocol?: 'https' | 'http';
 
 	/**
 	Prepends `defaultProtocol` to the URL if it's protocol-relative.
@@ -23,7 +21,7 @@ export type Options = {
 	readonly normalizeProtocol?: boolean;
 
 	/**
-	Normalizes `https:` URLs to `http:`.
+	Normalizes HTTPS URLs to HTTP.
 
 	@default false
 
@@ -39,9 +37,9 @@ export type Options = {
 	readonly forceHttp?: boolean;
 
 	/**
-	Normalizes `http:` URLs to `https:`.
+	Normalizes HTTP URLs to HTTPS.
 
-	This option can't be used with the `forceHttp` option at the same time.
+	This option cannot be used with the `forceHttp` option at the same time.
 
 	@default false
 

index.js

@@ -37,7 +37,7 @@ const normalizeDataURL = (urlString, {stripHash}) => {
 	}
 
 	// Lowercase MIME type
-	const mimeType = (mediaType.shift() || '').toLowerCase();
+	const mimeType = mediaType.shift()?.toLowerCase() ?? '';
 	const attributes = mediaType
 		.map(attribute => {
 			let [key, value = ''] = attribute.split('=').map(string => string.trim());
@@ -72,7 +72,7 @@ const normalizeDataURL = (urlString, {stripHash}) => {
 
 export default function normalizeUrl(urlString, options) {
 	options = {
-		defaultProtocol: 'http:',
+		defaultProtocol: 'http',
 		normalizeProtocol: true,
 		forceHttp: false,
 		forceHttps: false,
@@ -89,6 +89,11 @@ export default function normalizeUrl(urlString, options) {
 		...options,
 	};
 
+	// Legacy: Append `:` to the protocol if missing.
+	if (typeof options.defaultProtocol === 'string' && !options.defaultProtocol.endsWith(':')) {
+		options.defaultProtocol = `${options.defaultProtocol}:`;
+	}
+
 	urlString = urlString.trim();
 
 	// Data URL

index.test-d.ts

@@ -4,7 +4,7 @@ import normalizeUrl from './index.js';
 expectType<string>(normalizeUrl('sindresorhus.com'));
 expectType<string>(normalizeUrl('HTTP://xn--xample-hva.com:80/?b=bar&a=foo'));
 
-normalizeUrl('//sindresorhus.com:80/', {defaultProtocol: 'https:'});
+normalizeUrl('//sindresorhus.com:80/', {defaultProtocol: 'https'});
 normalizeUrl('//sindresorhus.com:80/', {normalizeProtocol: false});
 normalizeUrl('https://sindresorhus.com:80/', {forceHttp: true});
 normalizeUrl('http://sindresorhus.com:80/', {forceHttps: true});

readme.md

@@ -45,8 +45,8 @@ Type: `object`
 ##### defaultProtocol
 
 Type: `string`\
-Default: `http:`\
-Values: `'https:' | 'http:'`
+Default: `'http'`\
+Values: `'https' | 'http'`
 
 ##### normalizeProtocol
 
@@ -68,7 +68,7 @@ normalizeUrl('//sindresorhus.com', {normalizeProtocol: false});
 Type: `boolean`\
 Default: `false`
 
-Normalize `https:` to `http:`.
+Normalize HTTPS to HTTP.
 
 ```js
 normalizeUrl('https://sindresorhus.com');
@@ -83,7 +83,7 @@ normalizeUrl('https://sindresorhus.com', {forceHttp: true});
 Type: `boolean`\
 Default: `false`
 
-Normalize `http:` to `https:`.
+Normalize HTTP to HTTPS.
 
 ```js
 normalizeUrl('http://sindresorhus.com');
@@ -93,7 +93,7 @@ normalizeUrl('http://sindresorhus.com', {forceHttps: true});
 //=> 'https://sindresorhus.com'
 ```
 
-This option can't be used with the `forceHttp` option at the same time.
+This option cannot be used with the `forceHttp` option at the same time.
 
 ##### stripAuthentication
 

test.js

@@ -6,7 +6,6 @@ test('main', t => {
 	t.is(normalizeUrl('sindresorhus.com '), 'http://sindresorhus.com');
 	t.is(normalizeUrl('sindresorhus.com.'), 'http://sindresorhus.com');
 	t.is(normalizeUrl('SindreSorhus.com'), 'http://sindresorhus.com');
-	t.is(normalizeUrl('sindresorhus.com', {defaultProtocol: 'https:'}), 'https://sindresorhus.com');
 	t.is(normalizeUrl('HTTP://sindresorhus.com'), 'http://sindresorhus.com');
 	t.is(normalizeUrl('//sindresorhus.com'), 'http://sindresorhus.com');
 	t.is(normalizeUrl('http://sindresorhus.com'), 'http://sindresorhus.com');
@@ -42,6 +41,15 @@ test('main', t => {
 	t.is(normalizeUrl('https://i.vimeocdn.com/filter/overlay?src0=https://i.vimeocdn.com/video/598160082_1280x720.jpg&src1=https://f.vimeocdn.com/images_v6/share/play_icon_overlay.png'), 'https://i.vimeocdn.com/filter/overlay?src0=https://i.vimeocdn.com/video/598160082_1280x720.jpg&src1=https://f.vimeocdn.com/images_v6/share/play_icon_overlay.png');
 });
 
+test('defaultProtocol option', t => {
+	t.is(normalizeUrl('sindresorhus.com', {defaultProtocol: 'https'}), 'https://sindresorhus.com');
+	t.is(normalizeUrl('sindresorhus.com', {defaultProtocol: 'http'}), 'http://sindresorhus.com');
+
+	// Legacy
+	t.is(normalizeUrl('sindresorhus.com', {defaultProtocol: 'https:'}), 'https://sindresorhus.com');
+	t.is(normalizeUrl('sindresorhus.com', {defaultProtocol: 'http:'}), 'http://sindresorhus.com');
+});
+
 test('stripAuthentication option', t => {
 	t.is(normalizeUrl('http://user:[email protected]'), 'http://sindresorhus.com');
 	t.is(normalizeUrl('https://user:[email protected]'), 'https://sindresorhus.com');
@@ -365,7 +373,7 @@ test('data URL', t => {
 
 	// Options.
 	const options = {
-		defaultProtocol: 'http:',
+		defaultProtocol: 'http',
 		normalizeProtocol: true,
 		forceHttp: true,
 		stripHash: true,