Move to ESM (#33)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

.github/workflows/main.yml

@@ -10,12 +10,12 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
+          - 16
           - 14
           - 12
-          - 10
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm install

index.d.ts

@@ -1,41 +1,39 @@
-declare namespace decamelize {
-	interface Options {
-		/**
-		Character or string inserted to separate words in `string`.
+export interface Options {
+	/**
+	Character or string inserted to separate words in `string`.
 
-		@default '_'
+	@default '_'
 
-		@example
-		```
-		import decamelize = require('decamelize');
+	@example
+	```
+	import decamelize from 'decamelize';
 
-		decamelize('unicornRainbow');
-		//=> 'unicorn_rainbow'
+	decamelize('unicornRainbow');
+	//=> 'unicorn_rainbow'
 
-		decamelize('unicornRainbow', {separator: '-'});
-		//=> 'unicorn-rainbow'
-		```
-		*/
-		readonly separator?: string;
+	decamelize('unicornRainbow', {separator: '-'});
+	//=> 'unicorn-rainbow'
+	```
+	*/
+	readonly separator?: string;
 
-		/**
-		Preserve sequences of uppercase characters.
+	/**
+	Preserve sequences of uppercase characters.
 
-		@default false
+	@default false
 
-		@example
-		```
-		import decamelize = require('decamelize');
+	@example
+	```
+	import decamelize from 'decamelize';
 
-		decamelize('testGUILabel');
-		//=> 'test_gui_label'
+	decamelize('testGUILabel');
+	//=> 'test_gui_label'
 
-		decamelize('testGUILabel', {preserveConsecutiveUppercase: true});
-		//=> 'test_GUI_label'
-		```
-		*/
-		readonly preserveConsecutiveUppercase?: boolean;
-	}
+	decamelize('testGUILabel', {preserveConsecutiveUppercase: true});
+	//=> 'test_GUI_label'
+	```
+	*/
+	readonly preserveConsecutiveUppercase?: boolean;
 }
 
 /**
@@ -45,7 +43,7 @@ Convert a camelized string into a lowercased one with a custom separator: `unico
 
 @example
 ```
-import decamelize = require('decamelize');
+import decamelize from 'decamelize';
 
 decamelize('unicornRainbow');
 //=> 'unicorn_rainbow'
@@ -54,6 +52,5 @@ decamelize('unicornRainbow', {separator: '-'});
 //=> 'unicorn-rainbow'
 ```
 */
-declare function decamelize(string: string, options?: decamelize.Options): string;
+export default function decamelize(string: string, options?: Options): string;
 
-export = decamelize;

index.js

@@ -1,37 +1,31 @@
-'use strict';
-
 const handlePreserveConsecutiveUppercase = (decamelized, separator) => {
 	// Lowercase all single uppercase characters. As we
 	// want to preserve uppercase sequences, we cannot
 	// simply lowercase the separated string at the end.
 	// `data_For_USACounties` → `data_for_USACounties`
 	decamelized = decamelized.replace(
 		/((?<![\p{Uppercase_Letter}\d])[\p{Uppercase_Letter}\d](?![\p{Uppercase_Letter}\d]))/gu,
-		$0 => {
-			return $0.toLowerCase();
-		}
+		$0 => $0.toLowerCase(),
 	);
 
 	// Remaining uppercase sequences will be separated from lowercase sequences.
 	// `data_For_USACounties` → `data_for_USA_counties`
 	return decamelized.replace(
 		/(\p{Uppercase_Letter}+)(\p{Uppercase_Letter}\p{Lowercase_Letter}+)/gu,
-		(_, $1, $2) => {
-			return $1 + separator + $2.toLowerCase();
-		}
+		(_, $1, $2) => $1 + separator + $2.toLowerCase(),
 	);
 };
 
-module.exports = (
+export default function decamelize(
 	text,
 	{
 		separator = '_',
-		preserveConsecutiveUppercase = false
-	} = {}
-) => {
+		preserveConsecutiveUppercase = false,
+	} = {},
+) {
 	if (!(typeof text === 'string' && typeof separator === 'string')) {
 		throw new TypeError(
-			'The `text` and `separator` arguments should be of type `string`'
+			'The `text` and `separator` arguments should be of type `string`',
 		);
 	}
 
@@ -47,7 +41,7 @@ module.exports = (
 	// `myURLstring → `my_URLstring`
 	const decamelized = text.replace(
 		/([\p{Lowercase_Letter}\d])(\p{Uppercase_Letter})/gu,
-		replacement
+		replacement,
 	);
 
 	if (preserveConsecutiveUppercase) {
@@ -59,7 +53,7 @@ module.exports = (
 	return decamelized
 		.replace(
 			/(\p{Uppercase_Letter})(\p{Uppercase_Letter}\p{Lowercase_Letter}+)/gu,
-			replacement
+			replacement,
 		)
 		.toLowerCase();
-};
+}

index.test-d.ts

@@ -1,9 +1,9 @@
 import {expectType} from 'tsd';
-import decamelize = require('.');
+import decamelize from './index.js';
 
 expectType<string>(decamelize('unicornRainbow'));
 expectType<string>(decamelize('unicornRainbow', {separator: '-'}));
 expectType<string>(decamelize('unicornRainbow', {
 	separator: '-',
-	preserveConsecutiveUppercase: true
+	preserveConsecutiveUppercase: true,
 }));

package.json

@@ -10,8 +10,10 @@
 		"email": "sindresorhus@gmail.com",
 		"url": "https://sindresorhus.com"
 	},
+	"type": "module",
+	"exports": "./index.js",
 	"engines": {
-		"node": ">=10"
+		"node": "^12.20.0 || ^14.13.1 || >=16.0.0"
 	},
 	"scripts": {
 		"test": "xo && ava && tsd"
@@ -33,8 +35,9 @@
 		"convert"
 	],
 	"devDependencies": {
-		"ava": "^2.4.0",
-		"tsd": "^0.11.0",
-		"xo": "^0.24.0"
+		"ava": "^3.15.0",
+		"tsd": "^0.17.0",
+		"typescript": "^4.4.3",
+		"xo": "^0.44.0"
 	}
 }

readme.md

@@ -7,14 +7,14 @@ If you use this on untrusted user input, don't forget to limit the length to som
 
 ## Install
 
-```
-$ npm install decamelize
+```sh
+npm install decamelize
 ```
 
 ## Usage
 
 ```js
-const decamelize = require('decamelize');
+import decamelize from 'decamelize';
 
 decamelize('unicornRainbow');
 //=> 'unicorn_rainbow'
@@ -49,7 +49,7 @@ Default: `'_'`
 Character or string inserted to separate words in `string`.
 
 ```js
-cosnt decamelize = require('decamelize');
+import decamelize from 'decamelize';
 
 decamelize('unicornRainbow');
 //=> 'unicorn_rainbow'
@@ -66,7 +66,7 @@ Default: `false`
 Preserve sequences of uppercase characters.
 
 ```js
-const decamelize = require('decamelize');
+import decamelize from 'decamelize';
 
 decamelize('testGUILabel');
 //=> 'test_gui_label'

test.js

@@ -1,5 +1,5 @@
 import test from 'ava';
-import decamelize from '.';
+import decamelize from './index.js';
 
 test('decamelize', t => {
 	t.is(decamelize(''), '');
@@ -19,7 +19,7 @@ test('decamelize', t => {
 	t.is(decamelize('unicornRainbow', {separator: '-'}), 'unicorn-rainbow');
 	t.is(
 		decamelize('thisHasSpecialCharactersLikeČandŠ', {separator: ' '}),
-		'this has special characters like čand š'
+		'this has special characters like čand š',
 	);
 });
 
@@ -39,101 +39,101 @@ test('separator and options passed', t => {
 	t.is(
 		decamelize('testGUILabel', {
 			separator: '!',
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'test!GUI!label'
+		'test!GUI!label',
 	);
 });
 
 test('keeping blocks of consecutive uppercase characters but split the last if lowercase characters follow', t => {
 	t.is(
 		decamelize('A', {
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'A'
+		'A',
 	);
 	t.is(
 		decamelize('myURLString', {
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'my_URL_string'
+		'my_URL_string',
 	);
 	t.is(
 		decamelize('URLString', {
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'URL_string'
+		'URL_string',
 	);
 	t.is(
 		decamelize('oxygenO2Level', {
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'oxygen_O2_level'
+		'oxygen_O2_level',
 	);
 	t.is(
 		decamelize('StringURL', {
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'string_URL'
+		'string_URL',
 	);
 	t.is(
 		decamelize('STringURL', {
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'S_tring_URL'
+		'S_tring_URL',
 	);
 	t.is(
 		decamelize('numberOfDataForUSA', {
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'number_of_data_for_USA'
+		'number_of_data_for_USA',
 	);
 	t.is(
 		decamelize('testGUILabel', {
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'test_GUI_label'
+		'test_GUI_label',
 	);
 	t.is(
 		decamelize('CAPLOCKED1', {
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		'CAPLOCKED1'
+		'CAPLOCKED1',
 	);
 });
 
 test('long strings', t => {
 	// Factor to increase the test string
 	const times = 100;
 	const longString = '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'.repeat(
-		100
+		100,
 	);
 
 	t.is(
 		decamelize(longString),
-		new Array(times)
+		Array.from({length: times})
 			.fill(
-				'lb8_sv_aar_mshc_nvfxjg_g_cgfot3_az_azysux_rp_g9_xfp_l_cz89_te_wq_ad3_t_uo64_k45_vh2_mfj_l_yhztt4_lq_yzr_eb_tpx7g_gc_g4_t8ue_k_pm6_vra_x_kt_ul_jdnc_f_qh_e_qf_c_rw_wg_nscd_fe6_ute_av_n7_nze4_qy4hv_zu_klx5_yioh_gpv_nz_ut_l_gen3_wp2jot8_veprzy_x_qmi_kdxdxr_e_res_s_rg_swen_cz_xzp_ser_yu_ef_ap_vbju_djz9k_gmrxfrzq_vy_bdd_gf_y9_e_rqtx_h_qx_pw65_tt_eo3dgwhcuhv_c3d_my_rj6j_waon_kb3_pqtv27v_rv5_mg_yb5mgv_ce55o_ctbg9y_as_paw2_kq_y_vz3am_bge9_hgg_ez_xj_ghw_s_xjk_l7j_u_yk3_wj_q_ubw_vn_zn_hk_h3_p9_mpv_m98_dt_tn_ga_yf_k5_tj_d8_y5o_xpr_jmd_c_hzh_byboa_w2o_rj2_ft7dx_gkx_ls2s7qs_qs8_fs_jh_vc_yrm_vh_ra6th5_ciz_hsxk7vr5_d3_k_ysfsnr92_amt_r4_le_ram7_cv9em_b_buyk_qj_mej_lg_fsvg_tr_b_kmm_uqijx_sg_y'
+				'lb8_sv_aar_mshc_nvfxjg_g_cgfot3_az_azysux_rp_g9_xfp_l_cz89_te_wq_ad3_t_uo64_k45_vh2_mfj_l_yhztt4_lq_yzr_eb_tpx7g_gc_g4_t8ue_k_pm6_vra_x_kt_ul_jdnc_f_qh_e_qf_c_rw_wg_nscd_fe6_ute_av_n7_nze4_qy4hv_zu_klx5_yioh_gpv_nz_ut_l_gen3_wp2jot8_veprzy_x_qmi_kdxdxr_e_res_s_rg_swen_cz_xzp_ser_yu_ef_ap_vbju_djz9k_gmrxfrzq_vy_bdd_gf_y9_e_rqtx_h_qx_pw65_tt_eo3dgwhcuhv_c3d_my_rj6j_waon_kb3_pqtv27v_rv5_mg_yb5mgv_ce55o_ctbg9y_as_paw2_kq_y_vz3am_bge9_hgg_ez_xj_ghw_s_xjk_l7j_u_yk3_wj_q_ubw_vn_zn_hk_h3_p9_mpv_m98_dt_tn_ga_yf_k5_tj_d8_y5o_xpr_jmd_c_hzh_byboa_w2o_rj2_ft7dx_gkx_ls2s7qs_qs8_fs_jh_vc_yrm_vh_ra6th5_ciz_hsxk7vr5_d3_k_ysfsnr92_amt_r4_le_ram7_cv9em_b_buyk_qj_mej_lg_fsvg_tr_b_kmm_uqijx_sg_y',
 			)
-			.join('_')
+			.join('_'),
 	);
 	t.is(
 		decamelize(longString, {separator: '!'}),
-		new Array(times)
+		Array.from({length: times})
 			.fill(
-				'lb8!sv!aar!mshc!nvfxjg!g!cgfot3!az!azysux!rp!g9!xfp!l!cz89!te!wq!ad3!t!uo64!k45!vh2!mfj!l!yhztt4!lq!yzr!eb!tpx7g!gc!g4!t8ue!k!pm6!vra!x!kt!ul!jdnc!f!qh!e!qf!c!rw!wg!nscd!fe6!ute!av!n7!nze4!qy4hv!zu!klx5!yioh!gpv!nz!ut!l!gen3!wp2jot8!veprzy!x!qmi!kdxdxr!e!res!s!rg!swen!cz!xzp!ser!yu!ef!ap!vbju!djz9k!gmrxfrzq!vy!bdd!gf!y9!e!rqtx!h!qx!pw65!tt!eo3dgwhcuhv!c3d!my!rj6j!waon!kb3!pqtv27v!rv5!mg!yb5mgv!ce55o!ctbg9y!as!paw2!kq!y!vz3am!bge9!hgg!ez!xj!ghw!s!xjk!l7j!u!yk3!wj!q!ubw!vn!zn!hk!h3!p9!mpv!m98!dt!tn!ga!yf!k5!tj!d8!y5o!xpr!jmd!c!hzh!byboa!w2o!rj2!ft7dx!gkx!ls2s7qs!qs8!fs!jh!vc!yrm!vh!ra6th5!ciz!hsxk7vr5!d3!k!ysfsnr92!amt!r4!le!ram7!cv9em!b!buyk!qj!mej!lg!fsvg!tr!b!kmm!uqijx!sg!y'
+				'lb8!sv!aar!mshc!nvfxjg!g!cgfot3!az!azysux!rp!g9!xfp!l!cz89!te!wq!ad3!t!uo64!k45!vh2!mfj!l!yhztt4!lq!yzr!eb!tpx7g!gc!g4!t8ue!k!pm6!vra!x!kt!ul!jdnc!f!qh!e!qf!c!rw!wg!nscd!fe6!ute!av!n7!nze4!qy4hv!zu!klx5!yioh!gpv!nz!ut!l!gen3!wp2jot8!veprzy!x!qmi!kdxdxr!e!res!s!rg!swen!cz!xzp!ser!yu!ef!ap!vbju!djz9k!gmrxfrzq!vy!bdd!gf!y9!e!rqtx!h!qx!pw65!tt!eo3dgwhcuhv!c3d!my!rj6j!waon!kb3!pqtv27v!rv5!mg!yb5mgv!ce55o!ctbg9y!as!paw2!kq!y!vz3am!bge9!hgg!ez!xj!ghw!s!xjk!l7j!u!yk3!wj!q!ubw!vn!zn!hk!h3!p9!mpv!m98!dt!tn!ga!yf!k5!tj!d8!y5o!xpr!jmd!c!hzh!byboa!w2o!rj2!ft7dx!gkx!ls2s7qs!qs8!fs!jh!vc!yrm!vh!ra6th5!ciz!hsxk7vr5!d3!k!ysfsnr92!amt!r4!le!ram7!cv9em!b!buyk!qj!mej!lg!fsvg!tr!b!kmm!uqijx!sg!y',
 			)
-			.join('!')
+			.join('!'),
 	);
 	t.is(
 		decamelize(longString, {
 			separator: '!',
-			preserveConsecutiveUppercase: true
+			preserveConsecutiveUppercase: true,
 		}),
-		new Array(times)
+		Array.from({length: times})
 			.fill(
-				'lb8!sv!AAR!mshc!nvfxjg!G!cgfot3!AZ!azysux!rp!G9!xfp!L!cz89!te!wq!ad3!T!uo64!K45!VH2!mfj!L!yhztt4!LQ!yzr!eb!tpx7g!gc!G4!T8ue!K!pm6!vra!X!kt!UL!jdnc!F!qh!E!qf!C!rw!WG!nscd!fe6!UTE!av!N7!nze4!qy4hv!zu!KLX5!yioh!gpv!NZ!ut!L!gen3!WP2jot8!veprzy!X!qmi!kdxdxr!E!res!S!rg!SWEN!cz!XZP!ser!yu!ef!ap!vbju!DJZ9k!GMRXFRZQ!vy!BDD!gf!Y9!E!rqtx!H!qx!pw65!tt!eo3dgwhcuhv!C3d!my!RJ6j!waon!KB3!pqtv27v!rv5!mg!yb5mgv!CE55o!CTBG9y!AS!paw2!kq!Y!vz3am!bge9!hgg!ez!XJ!ghw!S!xjk!L7j!U!yk3!wj!Q!ubw!vn!ZN!hk!H3!P9!mpv!M98!dt!tn!GA!yf!K5!tj!D8!Y5o!XPR!jmd!C!hzh!byboa!W2o!RJ2!ft7dx!GKX!ls2s7qs!qs8!fs!JH!vc!yrm!VH!ra6th5!ciz!HSXK7vr5!D3!K!ysfsnr92!amt!R4!LE!ram7!CV9em!B!buyk!QJ!mej!LG!fsvg!tr!B!kmm!uqijx!sg!'
+				'lb8!sv!AAR!mshc!nvfxjg!G!cgfot3!AZ!azysux!rp!G9!xfp!L!cz89!te!wq!ad3!T!uo64!K45!VH2!mfj!L!yhztt4!LQ!yzr!eb!tpx7g!gc!G4!T8ue!K!pm6!vra!X!kt!UL!jdnc!F!qh!E!qf!C!rw!WG!nscd!fe6!UTE!av!N7!nze4!qy4hv!zu!KLX5!yioh!gpv!NZ!ut!L!gen3!WP2jot8!veprzy!X!qmi!kdxdxr!E!res!S!rg!SWEN!cz!XZP!ser!yu!ef!ap!vbju!DJZ9k!GMRXFRZQ!vy!BDD!gf!Y9!E!rqtx!H!qx!pw65!tt!eo3dgwhcuhv!C3d!my!RJ6j!waon!KB3!pqtv27v!rv5!mg!yb5mgv!CE55o!CTBG9y!AS!paw2!kq!Y!vz3am!bge9!hgg!ez!XJ!ghw!S!xjk!L7j!U!yk3!wj!Q!ubw!vn!ZN!hk!H3!P9!mpv!M98!dt!tn!GA!yf!K5!tj!D8!Y5o!XPR!jmd!C!hzh!byboa!W2o!RJ2!ft7dx!GKX!ls2s7qs!qs8!fs!JH!vc!yrm!VH!ra6th5!ciz!HSXK7vr5!D3!K!ysfsnr92!amt!R4!LE!ram7!CV9em!B!buyk!QJ!mej!LG!fsvg!tr!B!kmm!uqijx!sg!',
 			)
-			.join('Y!') + 'y'
+			.join('Y!') + 'y',
 	);
 });