fix: mark package as side effect free & add ESM exports metadata

package.json

@@ -5,10 +5,15 @@
 	"author": "@skyra",
 	"license": "MIT",
 	"main": "dist/index.js",
-	"module": "dist/index.es.js",
+	"module": "dist/index.mjs",
 	"browser": "dist/index.umd.js",
 	"unpkg": "dist/index.umd.js",
 	"types": "dist/index.d.ts",
+	"exports": {
+		"import": "./dist/index.mjs",
+		"require": "./dist/index.js"
+	},
+	"sideEffects": false,
 	"homepage": "https://skyra-project.github.io/char",
 	"private": false,
 	"files": [
@@ -30,31 +35,31 @@
 		"prepare": "husky install .github/husky"
 	},
 	"devDependencies": {
-		"@commitlint/cli": "^12.1.1",
-		"@commitlint/config-conventional": "^12.1.1",
-		"@sapphire/eslint-config": "^3.1.1",
-		"@sapphire/prettier-config": "^1.1.0",
-		"@sapphire/ts-config": "^2.2.0",
-		"@types/jest": "^26.0.22",
-		"@types/node": "^14.14.41",
-		"@typescript-eslint/eslint-plugin": "^4.21.0",
-		"@typescript-eslint/parser": "^4.22.0",
+		"@commitlint/cli": "^12.1.4",
+		"@commitlint/config-conventional": "^12.1.4",
+		"@sapphire/eslint-config": "^3.1.2",
+		"@sapphire/prettier-config": "^1.1.1",
+		"@sapphire/ts-config": "^2.2.1",
+		"@types/jest": "^26.0.23",
+		"@types/node": "^15.3.1",
+		"@typescript-eslint/eslint-plugin": "^4.24.0",
+		"@typescript-eslint/parser": "^4.24.0",
 		"cz-conventional-changelog": "^3.3.0",
-		"eslint": "^7.24.0",
-		"eslint-config-prettier": "^8.2.0",
+		"eslint": "^7.26.0",
+		"eslint-config-prettier": "^8.3.0",
 		"eslint-plugin-prettier": "^3.4.0",
 		"husky": "^6.0.0",
 		"jest": "^26.6.3",
 		"jest-circus": "^26.6.3",
 		"lint-staged": "^11.0.0",
-		"prettier": "^2.2.1",
+		"prettier": "^2.3.0",
 		"pretty-quick": "^3.1.0",
-		"rollup": "^2.45.2",
+		"rollup": "^2.48.0",
 		"rollup-plugin-cleaner": "^1.0.0",
 		"rollup-plugin-terser": "^7.0.2",
 		"rollup-plugin-typescript2": "^0.30.0",
-		"standard-version": "^9.2.0",
-		"ts-jest": "^26.5.5",
+		"standard-version": "^9.3.0",
+		"ts-jest": "^26.5.6",
 		"ts-node": "^9.1.1",
 		"typedoc": "^0.20.36",
 		"typescript": "^4.2.4"
@@ -104,7 +109,7 @@
 		"jest-environment-jsdom": "https://registry.yarnpkg.com/@favware/skip-dependency/-/skip-dependency-1.0.2.tgz",
 		"jest-jasmine2": "https://registry.yarnpkg.com/@favware/skip-dependency/-/skip-dependency-1.0.2.tgz",
 		"dot-prop": "^6.0.1",
-		"marked": "^2.0.1"
+		"marked": "^2.0.3"
 	},
 	"prettier": "@sapphire/prettier-config"
 }

rollup.config.ts

@@ -13,7 +13,7 @@ export default {
 			sourcemap: true
 		},
 		{
-			file: './dist/index.es.mjs',
+			file: './dist/index.mjs',
 			format: 'es',
 			exports: 'named',
 			sourcemap: true