Require Node.js 12.20 and move to ESM

.github/workflows/main.yml

@@ -10,13 +10,10 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
-          - 14
-          - 12
-          - 10
-          - 8
+          - 16
     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

@@ -5,12 +5,10 @@ Lowercase the keys of an object.
 
 @example
 ```
-import lowercaseKeys = require('lowercase-keys');
+import lowercaseKeys from 'lowercase-keys';
 
 lowercaseKeys({FOO: true, bAr: false});
 //=> {foo: true, bar: false}
 ```
 */
-declare function lowercaseKeys<T>(object: {[key: string]: T}): {[key: string]: T};
-
-export = lowercaseKeys;
+export default function lowercaseKeys<T>(object: Record<string, T>): Record<string, T>;

index.js

@@ -1,10 +1,3 @@
-'use strict';
-module.exports = object => {
-	const result = {};
-
-	for (const [key, value] of Object.entries(object)) {
-		result[key.toLowerCase()] = value;
-	}
-
-	return result;
-};
+export default function lowercaseKeys(object) {
+	return Object.fromEntries(Object.entries(object).map(([key, value]) => [key.toLowerCase(), value]));
+}

index.test-d.ts

@@ -1,5 +1,5 @@
 import {expectType} from 'tsd';
-import lowercaseKeys = require('.');
+import lowercaseKeys from './index.js';
 
-expectType<{[key: string]: boolean}>(lowercaseKeys({FOO: true, bAr: false}));
-expectType<{[key: string]: string | number}>(lowercaseKeys({foo: 'bar', baz: 1}));
+expectType<Record<string, boolean>>(lowercaseKeys({FOO: true, bAr: false})); // eslint-disable-line @typescript-eslint/naming-convention
+expectType<Record<string, string | number>>(lowercaseKeys({foo: 'bar', baz: 1}));

license

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
+Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (https://sindresorhus.com)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

package.json

@@ -4,13 +4,16 @@
 	"description": "Lowercase the keys of an object",
 	"license": "MIT",
 	"repository": "sindresorhus/lowercase-keys",
+	"funding": "https://github.com/sponsors/sindresorhus",
 	"author": {
 		"name": "Sindre Sorhus",
 		"email": "sindresorhus@gmail.com",
-		"url": "sindresorhus.com"
+		"url": "https://sindresorhus.com"
 	},
+	"type": "module",
+	"exports": "./index.js",
 	"engines": {
-		"node": ">=8"
+		"node": "^12.20.0 || ^14.13.1 || >=16.0.0"
 	},
 	"scripts": {
 		"test": "xo && ava && tsd"
@@ -31,8 +34,8 @@
 		"key"
 	],
 	"devDependencies": {
-		"ava": "^2.0.0",
-		"tsd": "^0.7.2",
-		"xo": "^0.24.0"
+		"ava": "^3.15.0",
+		"tsd": "^0.18.0",
+		"xo": "^0.45.0"
 	}
 }

readme.md

@@ -6,14 +6,14 @@ Check out [`map-obj`](https://github.com/sindresorhus/map-obj) if you need suppo
 
 ## Install
 
-```
-$ npm install lowercase-keys
+```sh
+npm install lowercase-keys
 ```
 
 ## Usage
 
 ```js
-const lowercaseKeys = require('lowercase-keys');
+import lowercaseKeys from 'lowercase-keys';
 
 lowercaseKeys({FOO: true, bAr: false});
 //=> {foo: true, bar: false}

test.js

@@ -1,5 +1,5 @@
 import test from 'ava';
-import lowercaseKeys from '.';
+import lowercaseKeys from './index.js';
 
 test('main', t => {
 	t.true(lowercaseKeys({FOO: true}).foo);