Move to ESM

.github/workflows/main.yml

@@ -10,14 +10,12 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
+          - 16
           - 14
           - 12
-          - 10
-          - 8
-          - 6
     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

@@ -1,98 +1,95 @@
-declare namespace prettyBytes {
-	interface Options {
-		/**
-		Include plus sign for positive numbers. If the difference is exactly zero a space character will be prepended instead for better alignment.
+export interface Options {
+	/**
+	Include plus sign for positive numbers. If the difference is exactly zero a space character will be prepended instead for better alignment.
 
-		@default false
-		*/
-		readonly signed?: boolean;
+	@default false
+	*/
+	readonly signed?: boolean;
 
-		/**
-		- If `false`: Output won't be localized.
-		- If `true`: Localize the output using the system/browser locale.
-		- If `string`: Expects a [BCP 47 language tag](https://en.wikipedia.org/wiki/IETF_language_tag) (For example: `en`, `de`, …)
-		- If `string[]`: Expects a list of [BCP 47 language tags](https://en.wikipedia.org/wiki/IETF_language_tag) (For example: `en`, `de`, …)
+	/**
+	- If `false`: Output won't be localized.
+	- If `true`: Localize the output using the system/browser locale.
+	- If `string`: Expects a [BCP 47 language tag](https://en.wikipedia.org/wiki/IETF_language_tag) (For example: `en`, `de`, …)
+	- If `string[]`: Expects a list of [BCP 47 language tags](https://en.wikipedia.org/wiki/IETF_language_tag) (For example: `en`, `de`, …)
 
-		__Note:__ Localization should generally work in browsers. Node.js needs to be [built](https://github.com/nodejs/node/wiki/Intl) with `full-icu` or `system-icu`. Alternatively, the [`full-icu`](https://github.com/unicode-org/full-icu-npm) module can be used to provide support at runtime.
+	__Note:__ Localization should generally work in browsers. Node.js needs to be [built](https://github.com/nodejs/node/wiki/Intl) with `full-icu` or `system-icu`. Alternatively, the [`full-icu`](https://github.com/unicode-org/full-icu-npm) module can be used to provide support at runtime.
 
-		@default false
-		*/
-		readonly locale?: boolean | string | readonly string[];
+	@default false
+	*/
+	readonly locale?: boolean | string | readonly string[];
 
-		/**
-		Format the number as [bits](https://en.wikipedia.org/wiki/Bit) instead of [bytes](https://en.wikipedia.org/wiki/Byte). This can be useful when, for example, referring to [bit rate](https://en.wikipedia.org/wiki/Bit_rate).
+	/**
+	Format the number as [bits](https://en.wikipedia.org/wiki/Bit) instead of [bytes](https://en.wikipedia.org/wiki/Byte). This can be useful when, for example, referring to [bit rate](https://en.wikipedia.org/wiki/Bit_rate).
 
-		@default false
+	@default false
 
-		@example
-		```
-		import prettyBytes = require('pretty-bytes');
+	@example
+	```
+	import { prettyBytes } from 'pretty-bytes';
 
-		prettyBytes(1337, {bits: true});
-		//=> '1.34 kbit'
-		```
-		*/
-		readonly bits?: boolean;
+	prettyBytes(1337, {bits: true});
+	//=> '1.34 kbit'
+	```
+	*/
+	readonly bits?: boolean;
 
-		/**
-		Format the number using the [Binary Prefix](https://en.wikipedia.org/wiki/Binary_prefix) instead of the [SI Prefix](https://en.wikipedia.org/wiki/SI_prefix). This can be useful for presenting memory amounts. However, this should not be used for presenting file sizes.
+	/**
+	Format the number using the [Binary Prefix](https://en.wikipedia.org/wiki/Binary_prefix) instead of the [SI Prefix](https://en.wikipedia.org/wiki/SI_prefix). This can be useful for presenting memory amounts. However, this should not be used for presenting file sizes.
 
-		@default false
+	@default false
 
-		@example
-		```
-		import prettyBytes = require('pretty-bytes');
+	@example
+	```
+	import { prettyBytes } from 'pretty-bytes';
 
-		prettyBytes(1000, {binary: true});
-		//=> '1000 bit'
+	prettyBytes(1000, {binary: true});
+	//=> '1000 bit'
 
-		prettyBytes(1024, {binary: true});
-		//=> '1 kiB'
-		```
-		*/
-		readonly binary?: boolean;
+	prettyBytes(1024, {binary: true});
+	//=> '1 kiB'
+	```
+	*/
+	readonly binary?: boolean;
 
-		/**
-		The minimum number of fraction digits to display.
+	/**
+	The minimum number of fraction digits to display.
 
-		If neither `minimumFractionDigits` or `maximumFractionDigits` are set, the default behavior is to round to 3 significant digits.
+	If neither `minimumFractionDigits` or `maximumFractionDigits` are set, the default behavior is to round to 3 significant digits.
 
-		@default undefined
+	@default undefined
 
-		```
-		import prettyBytes = require('pretty-bytes');
+	```
+	import { prettyBytes } from 'pretty-bytes';
 
-		// Show the number with at least 3 fractional digits
-		prettyBytes(1900, {minimumFractionDigits: 3});
-		//=> '1.900 kB'
+	// Show the number with at least 3 fractional digits
+	prettyBytes(1900, {minimumFractionDigits: 3});
+	//=> '1.900 kB'
 
-		prettyBytes(1900);
-		//=> '1.9 kB'
-		```
-		*/
-		readonly minimumFractionDigits?: number;
+	prettyBytes(1900);
+	//=> '1.9 kB'
+	```
+	*/
+	readonly minimumFractionDigits?: number;
 
+	/**
+	The maximum number of fraction digits to display.
 
-		/**
-		The maximum number of fraction digits to display.
+	If neither `minimumFractionDigits` or `maximumFractionDigits` are set, the default behavior is to round to 3 significant digits.
 
-		If neither `minimumFractionDigits` or `maximumFractionDigits` are set, the default behavior is to round to 3 significant digits.
+	@default undefined
 
-		@default undefined
+	```
+	import { prettyBytes } from 'pretty-bytes';
 
-		```
-		import prettyBytes = require('pretty-bytes');
+	// Show the number with at most 1 fractional digit
+	prettyBytes(1920, {maximumFractionDigits: 1});
+	//=> '1.9 kB'
 
-		// Show the number with at most 1 fractional digit
-		prettyBytes(1920, {maximumFractionDigits: 1});
-		//=> '1.9 kB'
-
-		prettyBytes(1920);
-		//=> '1.92 kB'
-		```
-		*/
-		readonly maximumFractionDigits?: number;
-	}
+	prettyBytes(1920);
+	//=> '1.92 kB'
+	```
+	*/
+	readonly maximumFractionDigits?: number;
 }
 
 /**
@@ -102,7 +99,7 @@ Convert bytes to a human readable string: `1337` → `1.34 kB`.
 
 @example
 ```
-import prettyBytes = require('pretty-bytes');
+import { prettyBytes } from 'pretty-bytes';
 
 prettyBytes(1337);
 //=> '1.34 kB'
@@ -119,9 +116,7 @@ prettyBytes(1337, {locale: 'de'});
 //=> '1,34 kB'
 ```
 */
-declare function prettyBytes(
+export function prettyBytes(
 	number: number,
-	options?: prettyBytes.Options
+	options?: Options
 ): string;
-
-export = prettyBytes;

index.js

@@ -1,5 +1,3 @@
-'use strict';
-
 const BYTE_UNITS = [
 	'B',
 	'kB',
@@ -9,7 +7,7 @@ const BYTE_UNITS = [
 	'PB',
 	'EB',
 	'ZB',
-	'YB'
+	'YB',
 ];
 
 const BIBYTE_UNITS = [
@@ -21,7 +19,7 @@ const BIBYTE_UNITS = [
 	'PiB',
 	'EiB',
 	'ZiB',
-	'YiB'
+	'YiB',
 ];
 
 const BIT_UNITS = [
@@ -33,7 +31,7 @@ const BIT_UNITS = [
 	'Pbit',
 	'Ebit',
 	'Zbit',
-	'Ybit'
+	'Ybit',
 ];
 
 const BIBIT_UNITS = [
@@ -45,7 +43,7 @@ const BIBIT_UNITS = [
 	'Pibit',
 	'Eibit',
 	'Zibit',
-	'Yibit'
+	'Yibit',
 ];
 
 /*
@@ -65,16 +63,16 @@ const toLocaleString = (number, locale, options) => {
 	return result;
 };
 
-module.exports = (number, options) => {
+export const prettyBytes = (number, options) => {
 	if (!Number.isFinite(number)) {
 		throw new TypeError(`Expected a finite number, got ${typeof number}: ${number}`);
 	}
 
-	options = Object.assign({bits: false, binary: false}, options);
+	options = {bits: false, binary: false, ...options};
 
-	const UNITS = options.bits ?
-		(options.binary ? BIBIT_UNITS : BIT_UNITS) :
-		(options.binary ? BIBYTE_UNITS : BYTE_UNITS);
+	const UNITS = options.bits
+		? (options.binary ? BIBIT_UNITS : BIT_UNITS)
+		: (options.binary ? BIBYTE_UNITS : BYTE_UNITS);
 
 	if (options.signed && number === 0) {
 		return ` 0 ${UNITS[0]}`;
@@ -94,7 +92,7 @@ module.exports = (number, options) => {
 	}
 
 	if (options.maximumFractionDigits !== undefined) {
-		localeOptions = Object.assign({maximumFractionDigits: options.maximumFractionDigits}, localeOptions);
+		localeOptions = {maximumFractionDigits: options.maximumFractionDigits, ...localeOptions};
 	}
 
 	if (number < 1) {
@@ -103,7 +101,7 @@ module.exports = (number, options) => {
 	}
 
 	const exponent = Math.min(Math.floor(options.binary ? Math.log(number) / Math.log(1024) : Math.log10(number) / 3), UNITS.length - 1);
-	// eslint-disable-next-line unicorn/prefer-exponentiation-operator
+	// eslint-disable-next-line prefer-exponentiation-operator
 	number /= Math.pow(options.binary ? 1024 : 1000, exponent);
 
 	if (!localeOptions) {

index.test-d.ts

@@ -1,7 +1,5 @@
 import {expectType} from 'tsd';
-import prettyBytes = require('.');
-
-const options: prettyBytes.Options = {};
+import {prettyBytes} from '.';
 
 expectType<string>(prettyBytes(1337));
 expectType<string>(prettyBytes(42, {signed: true}));

package.json

@@ -10,8 +10,11 @@
 		"email": "sindresorhus@gmail.com",
 		"url": "https://sindresorhus.com"
 	},
+	"type": "module",
+	"exports": "./index.js",
+	"types": "./index.d.ts",
 	"engines": {
-		"node": ">=6"
+		"node": ">=12"
 	},
 	"scripts": {
 		"test": "xo && ava && tsd"
@@ -37,8 +40,8 @@
 		"localized"
 	],
 	"devDependencies": {
-		"ava": "^1.4.1",
-		"tsd": "^0.7.2",
-		"xo": "^0.24.0"
+		"ava": "^4.0.1",
+		"tsd": "^0.19.1",
+		"xo": "^0.47.0"
 	}
 }

readme.md

@@ -16,7 +16,7 @@ $ npm install pretty-bytes
 ## Usage
 
 ```js
-const prettyBytes = require('pretty-bytes');
+import { prettyBytes } from 'pretty-bytes';
 
 prettyBytes(1337);
 //=> '1.34 kB'
@@ -95,7 +95,7 @@ The minimum number of fraction digits to display.
 If neither `minimumFractionDigits` or `maximumFractionDigits` are set, the default behavior is to round to 3 significant digits.
 
 ```js
-const prettyBytes = require('pretty-bytes');
+import { prettyBytes } from 'pretty-bytes';
 
 // Show the number with at least 3 fractional digits
 prettyBytes(1900, {minimumFractionDigits: 3});
@@ -115,7 +115,7 @@ The maximum number of fraction digits to display.
 If neither `minimumFractionDigits` or `maximumFractionDigits` are set, the default behavior is to round to 3 significant digits.
 
 ```js
-const prettyBytes = require('pretty-bytes');
+import { prettyBytes } from 'pretty-bytes';
 
 // Show the number with at most 1 fractional digit
 prettyBytes(1920, {maximumFractionDigits: 1});

test.js

@@ -1,13 +1,14 @@
+import process from 'node:process';
 import test from 'ava';
-import prettyBytes from '.';
+import {prettyBytes} from './index.js';
 
 test('throws on invalid input', t => {
 	t.throws(() => prettyBytes(''));
 	t.throws(() => prettyBytes('1'));
-	t.throws(() => prettyBytes(NaN));
+	t.throws(() => prettyBytes(Number.NaN));
 	t.throws(() => prettyBytes(true));
-	t.throws(() => prettyBytes(Infinity));
-	t.throws(() => prettyBytes(-Infinity));
+	t.throws(() => prettyBytes(Number.POSITIVE_INFINITY));
+	t.throws(() => prettyBytes(Number.NEGATIVE_INFINITY));
 	t.throws(() => prettyBytes(null));
 });
 
@@ -122,11 +123,11 @@ test('fractional digits options', t => {
 	t.is(prettyBytes(1001, {maximumFractionDigits: 3}), '1.001 kB');
 	t.is(prettyBytes(1000, {minimumFractionDigits: 1, maximumFractionDigits: 3}), '1.0 kB');
 	t.is(prettyBytes(3942, {minimumFractionDigits: 1, maximumFractionDigits: 2}), '3.94 kB');
-	t.is.skip(prettyBytes(59952784, {maximumFractionDigits: 1}), '59.9 MB'); // eslint-disable-line ava/no-skip-assert
-	t.is.skip(prettyBytes(59952784, {minimumFractionDigits: 1, maximumFractionDigits: 1}), '59.9 MB'); // eslint-disable-line ava/no-skip-assert
+	t.is.skip(prettyBytes(59_952_784, {maximumFractionDigits: 1}), '59.9 MB'); // eslint-disable-line ava/no-skip-assert
+	t.is.skip(prettyBytes(59_952_784, {minimumFractionDigits: 1, maximumFractionDigits: 1}), '59.9 MB'); // eslint-disable-line ava/no-skip-assert
 	t.is(prettyBytes(4001, {maximumFractionDigits: 3, binary: true}), '3.907 kiB');
-	t.is(prettyBytes(18717, {maximumFractionDigits: 2, binary: true}), '18.28 kiB');
-	t.is(prettyBytes(18717, {maximumFractionDigits: 4, binary: true}), '18.2783 kiB');
-	t.is(prettyBytes(32768, {minimumFractionDigits: 2, maximumFractionDigits: 3, binary: true}), '32.00 kiB');
-	t.is(prettyBytes(65536, {minimumFractionDigits: 1, maximumFractionDigits: 3, binary: true}), '64.0 kiB');
+	t.is(prettyBytes(18_717, {maximumFractionDigits: 2, binary: true}), '18.28 kiB');
+	t.is(prettyBytes(18_717, {maximumFractionDigits: 4, binary: true}), '18.2783 kiB');
+	t.is(prettyBytes(32_768, {minimumFractionDigits: 2, maximumFractionDigits: 3, binary: true}), '32.00 kiB');
+	t.is(prettyBytes(65_536, {minimumFractionDigits: 1, maximumFractionDigits: 3, binary: true}), '64.0 kiB');
 });