feat: commonjs compatibility

.gitignore

@@ -1,4 +1,5 @@
 /node_modules
+/cjs
 /dist
 /.vscode
 /coverage

package.json

@@ -10,32 +10,42 @@
     "formatting"
   ],
   "files": [
+    "cjs/index.js",
     "dist/index.js",
     "dist/index.d.ts"
   ],
-  "engines": {
-    "node": ">=12"
-  },
   "type": "module",
   "main": "./dist/index.js",
-  "exports": "./dist/index.js",
+  "exports": {
+    ".": [
+      {
+        "import": "./dist/index.js",
+        "require": "./dist/index.cjs",
+        "default": "./dist/index.js"
+      },
+      "./dist/index.js"
+    ]
+  },
   "types": "dist/index.d.ts",
+  "engines": {
+    "node": ">=12"
+  },
   "devDependencies": {
     "@types/jest": "26.0.23",
-    "@types/node": "15.0.3",
-    "@typescript-eslint/eslint-plugin": "4.23.0",
-    "@typescript-eslint/parser": "4.23.0",
-    "esbuild": "0.11.20",
-    "eslint": "7.26.0",
+    "@types/node": "15.6.1",
+    "@typescript-eslint/eslint-plugin": "4.25.0",
+    "@typescript-eslint/parser": "4.25.0",
+    "esbuild": "0.12.5",
+    "eslint": "7.27.0",
     "eslint-config-airbnb-typescript": "12.3.1",
     "eslint-config-prettier": "8.3.0",
-    "eslint-plugin-import": "2.22.1",
+    "eslint-plugin-import": "2.23.4",
     "eslint-plugin-jest": "24.3.6",
-    "jest": "26.6.3",
+    "jest": "27.0.3",
     "prettier": "2.3.0",
     "rimraf": "3.0.2",
-    "ts-jest": "26.5.6",
-    "typescript": "4.2.4"
+    "ts-jest": "27.0.1",
+    "typescript": "4.3.2"
   },
   "scripts": {
     "build": "bash scripts/build.sh",

scripts/build.sh

@@ -1,5 +1,11 @@
 #!/usr/bin/env bash
 
 rimraf dist
+rimraf cjs
 tsc --build tsconfig.build.json
+
+esbuild src/index.cjs --bundle --platform=node --outfile=dist/index.cjs
 esbuild src/index.ts --bundle --format=esm --outfile=dist/index.js
+
+# node12 compatibility
+mkdir cjs && cp dist/index.cjs cjs/index.js

src/index.cjs

@@ -0,0 +1,3 @@
+import numberfmt from './index';
+
+module.exports = numberfmt;

tsconfig.json

@@ -9,7 +9,7 @@
     "outDir": "./dist",
     "removeComments": true,
     "strict": true,
-    "target": "es5"
+    "target": "es6"
   },
   "include": ["src/**/*"],
   "exclude": ["node_modules/**/*"]